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Stepper motor speeds
Marv Frankel
Guys,
I have a pretty good handle on sizing stepper motors with respect to required torque, but I haven't heard any discussions about speed ranges and how they're controlled. I'm in the preliminary stages of designing a CNC retrofit for my Enco full size mill, and would like to use the smallest motor possible, to motorize the fine feed on the quill. My down feed requires almost no torque, but retracting requires about 120 to 150 oz/ins. I have enough room to gear the motor to feed at 1:1, 2:1, or 3:1, but I don't know the RPM range I can expect from the motor. Help please!! Marv Frankel Los Angeles |
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Re: emc pinout
Myron Cherry
On TurboCNC you can change the pinouts easily - in the setup which is saved
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in the ini file. EMC and DANCAD don't have that feature, as near as I can tell. You would have to get a 'breakout box' to redirect the wiring. Myron Cherry ----- Original Message -----
From: "Tim Goldstein" <timg@...> To: <CAD_CAM_EDM_DRO@...> Sent: Saturday, November 02, 2002 8:48 PM Subject: RE: [CAD_CAM_EDM_DRO] emc pinout You can not change the pinout without modifying the source code andaol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Demo CNC file - Heron - ??
Mark
Before I lost a hard drive, I had a dxf or vector or ?? drawing of
a heron in a circular cutout, with bullrushes etc. in the water where the heron is standing on one leg (how else do they stand?)... I can't find it anywhere - does anyone have the drawing or remember where it came from? I was gonna use it for cnc'd cristmas gift.... thanks / mark |
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Re: FAQ pages relocated
Tim Goldstein wrote:
Al,Back works for me. I'm using Netscape on Linux, but it probably works OK in all Netscape flavors. Jon |
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Re: Polar Coordinate based CNC
Lee Wenger wrote:
What all would have to happen to allow a CNC machine to be based on a polar coordinate system rather than a rectangular one. The big benefit to me would be that the single most expensive component of a router/plama type of system is the slides and drive components (the screws or rack/pinon not the motor itself) for the longest axis (for systems of the size/type I have in mind this would be to move a gantry). But I assume that would mandate a change to the controller so it could interpret g-codes as polar coordinates. Are there any controller packages out there currently that support polar-coordinates?This is called a robot, in the CNC world. Industrial robots use rotary axes almost exclusively. EMC was originally designed for robots, and does cartesian machines as a simplification. The one big problem with this is that it would only work correctly for ball-end tools. The machine can bring the center of the tool tip to a 3-D point defined in XYZ, but then you have to specify a multi-axis rotation for the tool at the end of the arm. Maybe this isn't as complicated as I think, but it definitely does complicate things, if you want to run a straight router bit down the side of a board. Now, if you restricted the robot to 2 rotary axes, the cutting tool could be kept square to the workpiece, if both arm pivots were around the vertical axis. EMC could handle this easily. Jon |
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Re: Pre-wired drive unit
Matt Shaver
I know you said "off list", but I think a lot of folks would be interested in
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the general price range for systems like this. Can you give us an approximate idea of what something like this would cost, or perhaps prices for a small range of example configurations? Thanks, Matt On Saturday 02 November 2002 04:09 pm, you wrote:
Hi, I build custom drive units in both servo and stepper models. |
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Mach1 Alpha 11.0
Art
Hi:
Just a note that Mach1 Alpha 11.0 is online. It includes subroutines of the fanuk variety and Macro capability along with Visual Basic scriptlets which can be exectuted with M-Codes of your choice to do complex IO functions for toolchangers and such. Pulse smoothing is raised by one level of magnitude from version 10.00 as well. Thanks, Art www.artofcnc.ca |
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Re: emc pinout
You can not change the pinout without modifying the source code and
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recompiling. Not for the Linux beginner. The backlash works as well as backlash can. No EMC does not read a tach (just wonder what the tach is hooked to?). It will give you cutter comp and with the constant contouring it can run surfacing programs and such much faster. You may want to take a look at Mach1. It is based on the EMC interpreter and has most/all/more features and you can easily change the pin-outs. Look at www.ArtofCNC.ca Tim [Denver, CO] Sherline products at Deep Discount www.KTMarketing.com/Sherline -----Original Message----- OFF Topic POSTS: General MachiningI consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner |
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emc pinout
can you change the pinout the board i use has diffrent pinouts (step
and direction for x y z axis)also does the backlash comp work good and also does it read a tach i use turbocnc now but as a machinist at work i use cutter comp and turbocnc does not have it and at home i woyld like it on my sherline mill thanks |
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Re: Nuts and Volts cnc article
jeffgnu
That was one of the prime reasons for me to get a subscription. I was
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interested in the "Heavy Metal" milling machine project. I even bought a few back copies to get all the articles, a few months later the author said he put the project on hold and would have a final article at a later time. Well, my subscription is about to run out and still no completed "Heavy Metal" project. I am letting my subscription expire... Although the price for a "home-built" might be close to a Homier mini-mill. The motor, the controller, the X-Y table is about the price for a ready built machine. --- In CAD_CAM_EDM_DRO@y..., "bdrmachine" <bdrmachine@h...> wrote:
What ever happened to the Nuts and Volts cnc article that was to air |
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Re: Polar Coordinate based CNC
Raymond Heckert
As it happens, my SHARNOA CNC Vmill uses Polar coords for
rapids (G10), linear feeds (G11), and circular interpolation (G12 & G13). The Polar mode allows geometrically pure ellipses, too. Also, makes very easy to machine helixes (read make threads). There are also two recti-linear G-codes, G00; a rapid, and G01; a linear interpolation. But, perhaps you're talking about a 'Robot-Arm' type of effector, where you'd have to calculate the angle vs. arm radius to determine true position. RayHex ---------- From: Lee Wenger <wenger2k@...>be based on a polar coordinate system rather than a rectangular one. The big benefit to me would be that the single most expensive component of a router/plama type of system is the slides and drive components (the screws or rack/pinon not the motor itself) for the longest axis (for systems of the size/type I have in mind this would be to move a gantry). But I assume that would mandate a change to the controller so it could interpret g-codes as polar coordinates. Are there any controller packages out there currently that support polar-coordinates? |
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Re: FAQ pages relocated
Frank,
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I am the web guy and the code is not going to change as it is the way I want to do it for my reasons. If you don't like it don't go there. You are more than welcome to use any style of code you want on your pages. Tim [Denver, CO] -----Original Message-----ssages: CAD_CAM_EDM_DRO@y... I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Your use of Yahoo! Groups is subject to |
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Re: FAQ pages relocated
--- In CAD_CAM_EDM_DRO@y..., "dakota8833" <dakota8833@b...> wrote:
backTim, youout. Have to go to my favorites menu and start over. Is this to stay on his page. Tim you need to have a talk with your web page Internet explorer works the same way. Do not reply on list as this is OT Thanks Frank |
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Re: FAQ pages relocated
Tim, This it a common thing,.. The programmer is using a redirect which keep sending you back to the same page. It is BS !! I am using Netscape. With Netscape just place your mouse pointer on the "back" icon and right click. This will bring up the history menu ,..you can now go back to other pages. I can't stand when a programmer forces you to stay on his page. Tim you need to have a talk with your web page man and tell him to remove this code. Frank |
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Re: toolpath creation problem or wrong interpretor setup?
Jim Brown
As I said, Im new to all of this. So using Surfcam is a bit confusing considering they give you very vague documentation of all processes. But Im learning. And what I cant figure out.........Ive always got the great CAD_CAM_EDM_DRO group to steer me in the right direction.
I didnt realize that I should be doing the toolpaths in the minus Z and use the top of the part as Z0. DOH! Art brought this to my attention in the Master5 group, but Ive yet to try it.(Actually I didnt know that I could cut in minus Z, so I never thought of trying it) Also Tim... removing the G43,G49's worked flawessly. Thanks for the suggestions. Thankfully I had enough sense to buy more than one of those endmills, so I have a few spares to break yet. And ALan.....I had to draw the part in one orientation. I drew the toolpath offsets in 2d in Solidworks and imported the DXF into Surfcam for toolpath creation.probablt could have done it easier, but Im learning . Maybe I'll figure it out sooner than later! Regards, Jim Alan Marconett KM6VV <KM6VV@...> wrote:Hi Tim, Jim, Yeah, like the 7BA carbon steal tap (from England) I just broke! And I was being nice to it! I'm milling the cylinder for a Stuart steam engine. I decided to also mill a "practice" block (CNC comes in handy for all those holes). It has "more conventional" threading. 5-40? Right. I probably have a dozen each of the conventional 4-40, 6-32, 8-32 etc. taps, and I THOUGHT I had 5-40 taps and dies. Never found a single one. Easy enough to pick up, but in a similar error, I also THOUGHT I had a stockpile of 5-40 allen head cap screws. Oh well. On the CNC, another thing that could get you in to trouble quick is drawing the part in one orientation, and needing to have the "setup" in another orientation. Also, having the drawing origin different then a convenient point to "touch off" on the work piece. Alan KM6VV Tim Goldstein wrote:
Addresses: FAQ: FILES: Post Messages: CAD_CAM_EDM_DRO@... Subscribe: CAD_CAM_EDM_DRO-subscribe@... Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@... List owner: CAD_CAM_EDM_DRO-owner@..., wanliker@... Moderator: jmelson@... timg@... [Moderator] URL to this group: OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Your use of Yahoo! Groups is subject to --------------------------------- Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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Re: Pre-wired drive unit
Hi, I build custom drive units in both servo and stepper models.
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Voltages from 24 to 80 and currents up to 40A. I can supply a system with or without motors. Motors can be new or surplus. Here are pics of a AS300D desktop servo controller and a AS300M machine mounted controller. www.members.shaw.ca/axxus3/as300d1.jpg www.members.shaw.ca/axxus3/as300dtop.jpg www.members.shaw.ca/axxus3/as300dopen.jpg www.members.shaw.ca/axxus3/as300dback.jpg www.members.shaw.ca/axxus3/as300m.jpg All controllers feature self latching e-stop relay, five switch inputs to computer, and two 12V relay drive outputs. Contact me off list for details Dean axxus@... --- In CAD_CAM_EDM_DRO@y..., "b564htf" <toolingrus@h...> wrote:
Does anyone manufacture a pre-wired drive unit with geckodrives, |
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Re: Polar Coordinate based CNC
Dan Statman
Since Y=rsin(theta) and X=rcos(theta) it is a very simple conversion. If
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you want to go the other way it becomes: r=sqrt(x^2+y^2) and theta=arctan(y/x). Should be a simple conversion. The problem is how do you do a linearly interpolated move from one point to another? Do you even want to do linear moves in polar coordinate space? Daniel J. Statman, Statman Designs www.statmandesigns.com dan.statman@... ----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...> To: <CAD_CAM_EDM_DRO@...> Sent: Saturday, November 02, 2002 3:02 PM Subject: Re: [CAD_CAM_EDM_DRO] Polar Coordinate based CNC Hi Lee, |
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Re: FAQ pages relocated
Al,
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Not sure if I am following the problem completely. Tell me if this is the situation. You go to the FAQ page at: And the FAQ site loads properly. You then try to return by using the back button on your browser and you keep ending up at the FAQ main page. If that is the issue than it is not readily changeable. I use a JavaScript call from the main FAQ page on KTMarketing.com to send you off to the server where the actual FAQ text is located. What happens if you hit the back button is that it momentarily loads the first page, but then the JavaScript kicks in and sends you back to the FAQ text page. You can sometimes get through this by hitting the back button twice fast or you can always just type a new URL into the address bar and go where you want. Tim [Denver, CO] -----Original Message----- Addresses: |
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Re: Polar Coordinate based CNC
Alan Marconett KM6VV
Hi Lee,
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Sounds like this would be similar to a Rho-Theta arm. Yes, the controller would have to know how to convert rectangular to polar coordinates. I'm wondering if EMC can already do this? That would be WILD machine! Alan KM6VV Lee Wenger wrote:
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Re: FAQ pages relocated
Tim,
When I click on your link, it works fine, BUT it won't let me back out. Have to go to my favorites menu and start over. Is this something easy to fix? Thanks, al --- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote: I have moved the FAQ pages to a different server and website. Ifyou access them by going to:instead bookmarked the actual pages or used the address 206.19.206.56 thanyou will get a pointer page or an error. Please update your bookmarks asneeded. started.
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