Electrical noise can be a bear.? Steve Spallings mentioned PC grounds and system or motor grounds.? I have his PMDX-126 and unfortunately the PC I'm using internally somewhere has the DC ground connected to the system frame which is the third earth prong on the power cord which then connects to the motor frames through the machine metal. The CUI encoders on the DC servos serve to further muck things up where their DC ground is connected to the frame.? Which is of course connected to the 3 prong and so DC ground earth ground are connected in several places. ?Shielding has no rhyme or reason here but it's one place where a single ended connection for a shield is a bit more logical. ? My EE book on electrical noise states that the signal grounds should never be connected to the DC power grounds or frame. ?The whole point of shielding is that it isolates the two. ? For your system also look at magnetic coupling.? The way a transformer works is a changing magnetic field introduces current in windings that are also in the magnetic field.? So the spindle motor current flowing through the wires can generate a field picked up encoder or limit switch wires. ?Short of what is called mu metal shielding the only solution to electromagnetic interference is distance.? Route them far apart. ? Electrostatic shielding is different.? Twisted pairs help to null out electric field noise. Shielding can be grounded at one end or both of the frame (third prong) earth.? The point is you only want the noise current flowing back through the shield into the frame.? Not through your signal wires which includes the DC 0V wires.? People tend to forget what goes out a signal wire is still a signal as it comes back through what is commonly called the ground or common wire.? (Some manufacturers have called the +5V to +24V 'common' for limit switches) ? John Dammeyer. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Todor Boshnakov
Sent: March-27-20 2:39 PM
To: [email protected]
Subject: Re: [MachCNC] strange stopping? You are trying to fix a wrong schematic with cosmetic changes. You sure have a ground loop somewhere. Check your shields, they should be connected one side only with heavy short wire to good ground. Preferably star connection. ? i forgot to mention that, i have ferrites everywhere. that is one of the first things i do.? i have them on the signal leads to each stepper and even on the usb cable to the pokeys although the mfg suggested it would not do anything. i tried a usb signal conditioner thing but it did not work, meaning that most things plugged into it stopped working. anyone know of a signal conditioned for usb that does work? Best regards, Spencer Chase
67550 Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...
Spencer@...
Spencer@...
(425) 791-0309
(707) 223-8212 ------ Original Message ------ Sent: 3/27/2020 4:03:12 AM Subject: Re: [MachCNC] strange stopping I would probably try adding ferrite beads to the leads. I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX. I am finally getting smooth motion no lost steps etc etc. Everything works except. Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again. I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.? I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.? when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff. I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.? I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.? any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix? Best regards, Spencer Chase
67550 Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...
Spencer@...
Spencer@...
(425) 791-0309
(707) 223-8212
|
You are trying to fix a wrong schematic with cosmetic changes. You sure have a ground loop somewhere. Check your shields, they should be connected one side only with heavy short wire to good ground. Preferably star connection.
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Show quoted text
On 27 Mar 2020, at 18:32, "spencer@..." <spencer@...> wrote:
? i forgot to mention that, i have ferrites everywhere. that is one of the first things i do.? i have them on the signal leads to each stepper and even on the usb cable to the pokeys although the mfg suggested it would not do anything. i tried a usb signal conditioner thing but it did not work, meaning that most things plugged into it stopped working.
anyone know of a signal conditioned for usb that does work?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 4:03:12 AM
Subject: Re: [MachCNC] strange stopping
I would probably try adding ferrite beads to the leads.
I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc. Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.?
when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
|
The USB interface is
typically not electrically isolated and if the ground of the computer and the
signal ground of the controller to which the Pokeys is connected are at
different potentials, then current will flow through the ground wire and the
shield of the USB cable. This current can cause interference with the data being
passed by the USB interface.
?
If you suspect this to be
and issue, try adding a heavy (18 AWG or heavier) wire from the chassis of the
computer to a signal ground on the controller. On the PMDX-126 the signal ground
is labeled PCgnd and appears on J1 through J7. Do not use the GND (machine
ground) on J11, J12, or J13 for this purpose. A quick way to check to see if
this is the issue, try running things from a laptop while on battery
power.
?
There are also USB
isolators sold as cables with a lump in the middle, popular on eBay and used by
musicians a lot.
?
As a side point, many of
our boards do not provide isolation of the USB port, but the PMDX-424 (and
possibly future products) do offer full isolation of the USB port.
?
Regards,
Steve
Stallings
PMDX
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i will contact him.? i did try adding a shielded braid over the usb
cable and do not think it helped but maybe i am thinking about something
else?
?
?
Best regards, Spencer
Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service
only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425)
791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 9:57:29 AM
Subject: Re: [MachCNC] strange stopping
In my opinion, you should contact Vince at? storm2313@.... he is very
knowledgeable and always ready to help you. He is fanatical about unwanted
noise in your system. I think he sells a USB cable that is shielded.
i forgot to mention that, i have ferrites everywhere. that is one of
the first things i do.? i have them on the signal leads to each stepper
and even on the usb cable to the pokeys although the mfg suggested it would
not do anything. i tried a usb signal conditioner thing but it did not work,
meaning that most things plugged into it stopped working.
anyone know of a signal conditioned for usb that does work?
?
?
Best regards, Spencer
Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service
only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425)
791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 4:03:12 AM
Subject: Re: [MachCNC] strange stopping
I would probably try adding ferrite beads to the
leads.
I have my router working really well with the following
configuration. Solid state tiny computer running win 10. Mach 3 latest
version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc.
Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not
reset, jog etc. The diag screen shows all ins and outs off. I have to
kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the
4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over
with a tool change to allow inserting a new part for machining. i am
also using the subroutine to make it possible to count
parts.?
when this failure happens is always close to the spindle motor
going on or off. it is a three phase servo run by a high quality US
inverter. Forgot the name right now but it is a good inverter not
Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the
Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz
to 2khz and have not had the problem yet but it some times does not
happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound
like it is inverter noise? might the lower carrier frequency be the
fix?
?
?
Best regards, Spencer
Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service
only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425)
791-0309 (707) 223-8212
|
i will contact him.? i did try adding a shielded braid over the usb cable and do not think it helped but maybe i am thinking about something else?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 9:57:29 AM
Subject: Re: [MachCNC] strange stopping
In my opinion, you should contact Vince at? storm2313@.... he is very knowledgeable and always ready to help you. He is fanatical about unwanted noise in your system. I think he sells a USB cable that is shielded.
i forgot to mention that, i have ferrites everywhere. that is one of the first things i do.? i have them on the signal leads to each stepper and even on the usb cable to the pokeys although the mfg suggested it would not do anything. i tried a usb signal conditioner thing but it did not work, meaning that most things plugged into it stopped working.
anyone know of a signal conditioned for usb that does work?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 4:03:12 AM
Subject: Re: [MachCNC] strange stopping
I would probably try adding ferrite beads to the leads.
I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc. Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.?
when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
|
In my opinion, you should contact Vince at? storm2313@.... he is very knowledgeable and always ready to help you. He is fanatical about unwanted noise in your system. I think he sells a USB cable that is shielded.
i forgot to mention that, i have ferrites everywhere. that is one of the first things i do.? i have them on the signal leads to each stepper and even on the usb cable to the pokeys although the mfg suggested it would not do anything. i tried a usb signal conditioner thing but it did not work, meaning that most things plugged into it stopped working.
anyone know of a signal conditioned for usb that does work?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 4:03:12 AM
Subject: Re: [MachCNC] strange stopping
I would probably try adding ferrite beads to the leads.
I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc. Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.?
when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
|
i forgot to mention that, i have ferrites everywhere. that is one of the first things i do.? i have them on the signal leads to each stepper and even on the usb cable to the pokeys although the mfg suggested it would not do anything. i tried a usb signal conditioner thing but it did not work, meaning that most things plugged into it stopped working.
anyone know of a signal conditioned for usb that does work?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/27/2020 4:03:12 AM
Subject: Re: [MachCNC] strange stopping
I would probably try adding ferrite beads to the leads.
I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc. Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.?
when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
|
I would probably try adding ferrite beads to the leads.
toggle quoted message
Show quoted text
On 27 Mar 2020, at 00:20, " spencer@..." < spencer@...> wrote:
I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc. Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.?
when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
|
I have my router working really well with the following configuration. Solid state tiny computer running win 10. Mach 3 latest version Pokeys USB CNC thing connected to a PDMX.
I am finally getting smooth motion no lost steps etc etc. Everything works except.
Occasionally Mach3 just stops and is totally unresponsive. Can not reset, jog etc. The diag screen shows all ins and outs off. I have to kill Mach 3 and start again.
I am pretty sure that every time it does this, when I restart the 4th axis DRO shows 4099.xxx? the 4th axix is angular.?
I am running a gcode with a subroutine that repeats over and over with a tool change to allow inserting a new part for machining. i am also using the subroutine to make it possible to count parts.?
when this failure happens is always close to the spindle motor going on or off. it is a three phase servo run by a high quality US inverter. Forgot the name right now but it is a good inverter not Chinese no name stuff.
I am pretty sure the spindle motor is causing noise that kills the Pokeys. I have proper grounding and shielding.?
I changed the inverter carrier frequency from the default of 5Khz to 2khz and have not had the problem yet but it some times does not happen for a considerable time.?
any ideas? does the 4099 signify some overflow?? does it sound like it is inverter noise? might the lower carrier frequency be the fix?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
|
?
In this tutorial I will be going through all the main screens on Mach3 that you will use to run your G code programs.
I will explain what most of the buttons do and my opinion on how effective the software is at running a hobby cnc machine.
?
|
MACH 3 LATHE WEAR OFFSETS FUNCTION IN REVERSE
Hello,
I'm using Mach3 on one of my lathes.
The offset wear functions in reverse of normal.
A positive number in X wear makes the part diameter?smaller.
A negative number in X wear makes the part diameter larger.
A positive number in Z?moves the tool closer to the chuck.
A negative number in Z?moves the tool away from the chuck.
Regular offsets function normally, only the wear is reversed.
What causes this problem?
Any helpful advice would be appreciated.
Rick
|
Re: Machine e stop activated mid cut
I tried to set the debounce 500 and 1000 and I still had the same problem. Not sure if this could be a machine issue. I will have a look at the wiring later on. Thanks?
|
Mach 4 - Description and main features
?
According to the manufacturer , Mach4 is completely new software and has less than 1% of the programming code in common with Mach3. It was written from the ground up to be expandable, flexible, and extremely responsive for use with very large files on any operating system; including Windows, Apple, and Linux.
?
Here are the main features of it
?
|
Re: Ballscrew Ballnut Disaster
??? ??? the better news is it wasn't hooked up to a live torpedo
??? ??? animal
On 3/13/2020 10:24 AM, Dan Mauch wrote:
toggle quoted message
Show quoted text
? ?I have been working with ballscrews and ball nuts for 50 years.
I first leaned that if the balls come out of the ballnut it is a
real problem to fix. I had my first disaster? while working in a
shipyard installing a automated new torpedo handling system on a
submarine. While testing I overran one of the ballnuts and the
balls came out. Fortunately, the balls fell into a cavity where
they were easily removed.? The ballnut had the recirculating
return tubes that were removable so I was able to put the balls
back in and that fixed the problem.
? Unfortunately, a couple days ago I was working a a dyna
mechatronics Y axis that I had retrofitted for a P7 precision
ballscrew with a double anti backlash ball nut. After I had the Y
axis assembled? I? wanted to see how well the mechanism was
working. In Mach3 I had pressed the tab key to bring up the MPG.
My monitor for some reason doesn't show the LEDS for the jog mode.
I did not realize that it was in the incremental mode and that
mode was set to 10.000. When I clicked on the Y + button the Y
axis flew passed the ballscrew to the extreme and beyond the
ballnut spewing the balls out. The ball nut does not have a
removable recirculation tube and are sealed from the factory. I
uttered a several of choice words I learned in the shipyard.? The
good news was that I had ordered a spare ballnut because the
ballnut flange is round and I had to grind a flat on the the top
and the bottom for clearance with the base and the Y axis. I would
have to keep spraying the ballnut flange with water to keep it
from overheating and I so I was glad that I had ordered a spare. I
ground the top and bottom of the replacement? ballnut flange and
installed the ballscrew in it and reassembled the Y axis this time
adding a positive stop on the Y axis and now have it working
properly and with limit switches.??
|
Re: Ballscrew Ballnut Disaster
i forget the details but i once lost some balls out of the end of a ballscrew and looked online for a fix. i did find a way to put the balls back in on a screw without a recirc cover. i remember one site where some guy was precision grading balls to get a very precise fit and was taking these things apart and putting them back over and over.
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/13/2020 10:24:12 AM
Subject: [MachCNC] Ballscrew Ballnut Disaster
? ?I have been working with ballscrews and ball nuts for 50 years. I first leaned that if the balls come out of the ballnut it is a real problem to fix. I had my first disaster? while working in a shipyard installing a automated new torpedo handling system on a submarine. While testing I overran one of the ballnuts and the balls came out. Fortunately, the balls fell into a cavity where they were easily removed.? The ballnut had the recirculating return tubes that were removable so I was able to put the balls back in and that fixed the problem.
? Unfortunately, a couple days ago I was working a a dyna mechatronics Y axis that I had retrofitted for a P7 precision ballscrew with a double anti backlash ball nut. After I had the Y axis assembled? I? wanted to see how well the mechanism was working. In Mach3 I had pressed the tab key to bring up the MPG. My monitor for some reason doesn't show the LEDS for the jog mode. I did not realize that it was in the incremental mode and that mode was set to 10.000. When I clicked on the Y + button the Y axis flew passed the ballscrew to the extreme and beyond the ballnut spewing the balls out. The ball nut does not have a removable recirculation tube and are sealed from the factory. I uttered a several of choice words I learned in the shipyard.? The good news was that I had ordered a spare ballnut because the ballnut flange is round and I had to grind a flat on the the top and the bottom for clearance with the base and the Y axis. I would have to keep spraying the ballnut flange with water to keep it from overheating and I so I was glad that I had ordered a spare. I ground the top and bottom of the replacement? ballnut flange and installed the ballscrew in it and reassembled the Y axis this time adding a positive stop on the Y axis and now have it working properly and with limit switches.??
|
Ballscrew Ballnut Disaster
? ?I have been working with ballscrews and ball nuts for 50 years. I first leaned that if the balls come out of the ballnut it is a real problem to fix. I had my first disaster? while working in a shipyard installing a automated new torpedo handling system on a submarine. While testing I overran one of the ballnuts and the balls came out. Fortunately, the balls fell into a cavity where they were easily removed.? The ballnut had the recirculating return tubes that were removable so I was able to put the balls back in and that fixed the problem.
? Unfortunately, a couple days ago I was working a a dyna mechatronics Y axis that I had retrofitted for a P7 precision ballscrew with a double anti backlash ball nut. After I had the Y axis assembled? I? wanted to see how well the mechanism was working. In Mach3 I had pressed the tab key to bring up the MPG. My monitor for some reason doesn't show the LEDS for the jog mode. I did not realize that it was in the incremental mode and that mode was set to 10.000. When I clicked on the Y + button the Y axis flew passed the ballscrew to the extreme and beyond the ballnut spewing the balls out. The ball nut does not have a removable recirculation tube and are sealed from the factory. I uttered a several of choice words I learned in the shipyard.? The good news was that I had ordered a spare ballnut because the ballnut flange is round and I had to grind a flat on the the top and the bottom for clearance with the base and the Y axis. I would have to keep spraying the ballnut flange with water to keep it from overheating and I so I was glad that I had ordered a spare. I ground the top and bottom of the replacement? ballnut flange and installed the ballscrew in it and reassembled the Y axis this time adding a positive stop on the Y axis and now have it working properly and with limit switches.??
|
Your power supply is just as important as your drivers. ?Switching power supplies work for some situations. Stepper motors like current; raw unregulated power. ?
See www.timsmachines.com/electronics/
See?www.timsmachines/co2-laser-cutter/laser-electronics/
and reference the section on “Stepper Motor Stalling...”
I have experimented with various drivers and settled on Gecko Drivers and an Antek Power supply. ?I have two Power Supplies, a 48 volt one for my laser and a 70 Volt Power supply for my CNC.
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On Mar 11, 2020, at 7:52 PM, "spencer@..." <spencer@...> wrote:
? why is quietness important?? if you limit the motor current with whatever setting ability you have with your driver you can get it quieter but with less power. microstepping can also be quieter. playing with acceleration and speeds can also effect noise but you have to decide what is important quietness or other aspects of performance. if you really need quietness most and pretty good performance you might do better with servo motors. steppers are just inherently noisier.?
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Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/11/2020 4:34:34 PM
Subject: [MachCNC] Motor tuning
Hi, I am new to cnc machines and I was wanting to know if anyone can help me with tweaking of my stepper motors. I am trying to make it sound as quiet as possible but I cant find out how to tune the motors properly.? Any help will be much appreciated?
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Quiet is good but results in less power. ?You want your motors to “sing” when moving for maximum power. Over power and over acceleration causes a growling noise resulting in missed steps ?
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Show quoted text
On Mar 11, 2020, at 7:52 PM, "spencer@..." <spencer@...> wrote:
? why is quietness important?? if you limit the motor current with whatever setting ability you have with your driver you can get it quieter but with less power. microstepping can also be quieter. playing with acceleration and speeds can also effect noise but you have to decide what is important quietness or other aspects of performance. if you really need quietness most and pretty good performance you might do better with servo motors. steppers are just inherently noisier.?
?
?
Best regards, Spencer Chase 67550 Bell Springs Rd. Garberville, CA 95542 Postal service only. Laytonville, CA 95454 UPS only. Spencer@...Spencer@...Spencer@...(425) 791-0309 (707) 223-8212
------ Original Message ------
Sent: 3/11/2020 4:34:34 PM
Subject: [MachCNC] Motor tuning
Hi, I am new to cnc machines and I was wanting to know if anyone can help me with tweaking of my stepper motors. I am trying to make it sound as quiet as possible but I cant find out how to tune the motors properly.? Any help will be much appreciated?
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What is your drivers?
Fortino
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If your stepper motor drivers are higher quailty and there is a mid band ajustment on the driver like gecko drive has then you tune it runnings at about 5 IPM
Dan
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If your stepper motor drivers are higher quailty and there is a mid band ajustment on the driver like gecko drive has then you tune it runnings at about 5 IPM
Dan
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Re: Machine e stop activated mid cut
Be careful not to set the debounce too high in the General Config menu because? if it is too high the table may hit the switch but delayed for a time greater than the actuation time of the switch and the speed of the router XYZ axis can handle.
Dan Mauch
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