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Re: Compumotor Plus stepper drive

eric
 

Ron Wickersham wrote:

yes, when equipped with a hi-resolution position sensor (such as a
resolver,
or encoder) there is no distinction between a stepper motor and a
brushless
dc servo motor.

-ron
I have at least one synchro resolver in the junk drawer. Are they
really high resolution, or just as good as analog can get? I guess you
could have more than one sine wave per rev and get more resolution. I
pretty much have written the thing off myself, seeing how encoders are
pretty cheap.
eric
Re: stepper & driver

Douglas Pollard
 

Hi Bellendo
I will take your advice on the two motors driving the x axis and will
use instead a jack shaft to drive sprockets on both sides of the x axis and
will use chain on the Y axis as well.
I will be making parts during the winter as well as finishing up my
building. Assembly will start in the spring.
In the meantime I will also build a very small three axis
engraver-router to learn what the building of a cnc machine is all about. I
have some small stepper motors and an old 486 Dell computer to run it. and a
bunch of shafting out old dot matrix printers too. I don't want to reinvent
the wheel on this so I will probably buy a set of plans to work from. Any
advice as to what set of plans would be easy to build using as much of the
hardware that I have would br helpful.
I would like to thank you and everyone else for their input.
Doug

- Original Message -----
From: "ballendo" <ballendo@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: Wednesday, November 26, 2003 3:29 AM
Subject: [CAD_CAM_EDM_DRO] Re: stepper & driver


Doug,

Sounds like you've considered the implications of the Oak subframe,
and it will likely work since you're willing to sacrifice some
accuracy.

I personally don't think using two motors on a given axis is a good
idea... (Mariss of Gecko has also stated the problems of such a
choice.)

Having said that, there are a large number of machines both hobby and
commercial which successfully use two motor drive. But I wouldn't...

If you're going to use chain for the long axis (X, though some
mistakenly call this Y); IMO you should also use it for Y. You will
get FAR in excess of your desired travel rates, IME. Easily 240 IPM
with 2A "cheap" drives, 34V power, size 34 double stack motor, and
4:1 reduction. For cuts in the 120IPM arena... BTW, go ahead and use
a screw for the Z, it makes things easier.

Good luck, send pics when you're done!

Ballendo



--- In CAD_CAM_EDM_DRO@..., "Douglas Pollard"
<dougpol1@o...> wrote:
Hi cnc folks,
My thinking on using oak to build a cnc router is that I
already have the wood "free". with it screwed and glued together it
will be light. Several coats of epoxy will solve most of the
expansion problems where moisture is concerned. I plan to use metal
ways for accuracy and ease of movement. The x axis rails will be
tied together with metal bars so the expansion of the wood will not
change the y axis width. Only one rail will be bolted tight to the
wood the second will offer support only but will not act as a guide.
I have 50 ft of roller chain it is about the size of bicycle
chain # 10 I would guess. I am thinking that I will put one piece on
each side of the gantry to drive in the x axis. Each side will be
driven by a # 33 frame motor {Ithink this is the right designation?}
It's close anyway. I understand that. I that I can hook them up in
series.
I would consider 30 to 50 inches a min. feed rate with 100
inches rapid traverse a complete success anything faster would be a
bonus.
The Y and x axis would probably be driven by lead screw. I
see no reason that a second motor on the y lead screw could not be
added if needed also hooked up in series.
Any comments on the practicality of hooking motors in
series would be a big help. Do you get double the power? Do they
interfere with each other? Does this overload the drivers in some
way. I assume power supplies have to be larger?
I have seen reference to this practice on line but no real
detail as to, how.
Doug



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Re: need motor for CNC (sherline)

walt smith
 

This is something I might try, but I still need a motor (right now I have to
switch the motor back to the lathe when I want to use it and put it on the
mill when I need it

What I actuly have been doing is choping up my cuts into a bunch of subs and
putting a pause in the control program so I can manuely feed/lift the
milling head. The problem is I have paint twice for motors and bouth don't
work. If it weren't that the motor from the lathe does work, I'd think
there was a different problem. But if the lathe motor works, I should be
able to find a new motor that will work--Ijust don't know a damn thing about
stepper motors so I have no idea what to buy or from who (I don't want to go
back to backtrack as they don't seem inclined to work with me on this)

-----Original Message-----
From: Darrell [mailto:dgehlsen@...]
Sent: Tuesday, July 11, 2000 5:00 PM
To: CAD_CAM_EDM_DRO@...
Subject: Re: [CAD_CAM_EDM_DRO] need motor for CNC (sherline)


Also, if you have any backlash on Z, by counterbalancing a little heavy (so
the Z motor has to push Z down) you could eliminate the backlash.
Darrell

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Re: Opinions: Cheap 3-axis Software

Jon Elson
 

Mike wrote:


Thanks for the feedback. The linux world is tempting, but the
learning
curve on all this is steep enough without throwing a new operating
system
into the mix. Perhaps I can get started with some cheap/free DOS
based
software and graduate to the open linux stuff later?
Yes, with stepper motors, you can definitely do this. there are a bunch
of programs
out there that many people like. Really, there may not be much
advantage with EMC
if you will only be using steppers. If you have an interest in a servo
driven machine,
however, EMC is the ONLY low-cost solution I'm aware of. (Low cost
means less
than $10,000 !)

Do you run the EMC software?
Yes, mostly because I DID want servos, ball screws and high accuracy +
moderate speed.

I assume it's open source so if you're savvy
you can customize it?
Minor customization is built into the setup procedure. You have to
specify
maximum speeds and accelerations, travel limits, encoder or stepper
count size,
and define the bits, scales and polarities that make everything work.

More serious customization is possible. The Tk/Tcl graphical user
interface
is quite easy to customize. Some of the other stuff, like the motion
control
and RS-274D interpreter gets pretty deep, and you really need to study
the
code before changing anything.

Jon
Re: Conversational Programming and Subroutines

Jon Elson
 

Donald Kelley wrote:

Hi there,
I'm a lurker. If a conversational language is developed
it should come with a tools to allow conversion to and from
Gcodes. I think that would allow for more support in the long
run and also allow for testing against known working code.

As far as subroutines go.. although I can imagine some
difficulties in integrating them into a system that was not originally

designed to have them, it makes alot of sense to make subroutines
available to the gcode programmer(even if one had to preprocess
the Gcode file to put the subroutines inline). If you went to the
effort to preprocess subroutines, it might make sense to add the
capability to put in count controlled loops and other sundry
flow control structures.
Well, in fact, the C preprocessor should be able to do this. You'd need
to run it
through a renumber program afterwards.

Jon
Re: Conversational Programming

Jon Elson
 

Ron Ginger wrote:

5)Subroutines and gcode.
It would seem logical that the storage format of CPNCs files should be

gcode. So it could be used as a form of code generator. Many of its
higher level objects are much like gcode subroutines- in my program
you
enter just a couple dimensions fotr a bolt cirlce, and it gets
expanded
by the program just like a gcode subroutine.

This may die off here on the list, but I'm going to do it, and Im
going
to do it the 'open source' way.
If you aren't familiar with what I've already put in the public domain,
you should
look at : which is my
page
of programs that write G-code. You answer a few questions, and these
little
c programs (supplied as source) write the g-code for boring circular
holes or
pockets, milling out a rectangular pocket or trepanning out a
rectangular hole,
drilling (and also peck-drilling) a circular array of holes (bolt
circle).
There is also a program for thread milling with a single-row thread
mill.
(These can do any thread pitch with one tool.)

I have a few more that I need to clean up and add to the list. I use
these
more than my Bobcad/CAM software, because I don't have to fight it to
get it to do things in a milling machine-oriented way. These programs
are
pretty well optimized for efficient movements of the tool. They pretty
much
all do climb milling profiles.

If someone wanted to recode them in Tk/Tcl for use with the TkEMC user
interface of EMC, I'd be glad to help explain any quirky bits of the
code.

Jon
Re: Conversational Programming and NAMES- very long!

Jon Elson
 

Pete Jarman wrote:

Ron wrote:

<The only way to make a decent CPNC system with a windows GUI is to
use a
<separate motion controller box to handle the real time stuff. We had
<some discussions here a few weeks ago about developing such a box,
but
<that died.

Is there any way that the motion controller box could be an outdated
x86 PC
with an interface card running a real time programme under either DOS
or
linux? The software would handle incoming commands and report status
through
the serial port to the controlling PC running the GUI and the
conversational
programming software.
Yes, in theory, a DOS program that makes no system calls, and has no TSR
programs that
might grab control away will be allowed to run unimpeded, and can
achieve real time
performance. The serial port might be a bit slow for this. But, if you
are throwing Linux
into the equation, who needs any extra computers? They just make
debugging that much
more of a hassle. If you will be using Linux, put everything on it, the
real-time motion
control will make sure it has adequate time to process the motion, and
the rest is left
to the user's various tasks. I do this now, and pretty fearlessly edit
programs while the
machine is running others. (The only problem is that while you are in
another window,
you lose keyoard and mouse focus to the machining task, so the only
emergency
control is the E-stop button, which is a bit drastic. Nothing like
trying to switch focus
with the mouse when a crash is 1/2 second away!)

Jon
Ecoder resolution terms

Mina Aboul Saad
 

Hi,

I just need to know the difference between several encoder resolution terms.
I read the Gecko requirement and it mentioned a min. 200 line encoder
Searching to buy the encoders, I found the following resolution terms:
- Count per Revolution (CPR)
- Pulse per Revolution (PPR)

Could someone please explain the difference between the 3 terms.

Merry Xmas everybody.

Mina F.
Motors & encoders connection

Mina Aboul Saad
 

So, I got the breakout board, the Geckos 320 and the power supply is almost
done.

Now, it's time to start wiring, I found out that my servo motors have 4 pin
connection, how do I know which of the 4 wires is the Arm+ and Arm- to be
connected to the geckos, or does this mean that my motors are double
winding??

Regarding the encoders, they carry 17 pin connector, is there a way to know
which wires for phase A and B, and also the +5V and the ground???
Is there some kind of standard for wire colors???

Help is appreciated.

Mina F.
Re: How small can a plasma torch get?

josef-wagner
 

_____

Von: CAD_CAM_EDM_DRO@...
[mailto:CAD_CAM_EDM_DRO@...] Im Auftrag von afogassa
Gesendet: Samstag, 2. September 2006 03:03
An: CAD_CAM_EDM_DRO@...
Betreff: [CAD_CAM_EDM_DRO] Re: How small can a plasma torch get?



--- In CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
DRO@..., Ron Ginger <ronginger@...>
wrote:
good evening from vienna to ron ginger
I have none built by myself, but I have ordered really tons of laser as well
as plasma cutted stainless steel parts, from TP304 to very high grades as HL
and so.

From my experience with Austrian and german companies plasma cutting is much
better in termns of accuracy than oxygen cutting. But laser cutting is about
10 times better resulting a much smaller area which remains heat effected,
gives a much smoother cutted surface- which makes it working later on with
stainless steel material much more easier and cheaper as the cutted surface
needs not to be glass blasted prior to welding execution.

Best of all would be electronic beam cutting, for extreeeme precise cutting
in vacuum and clean room condition.

Best greetings from Vienna

Josef wagner


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<
89637&stime=1157158982>
Hello group

Robert
 

Topics in this post:
Maxnc:
I take it this driver unit is a phase driven type and to do step direction I need that type driver board.

Comment on Sales:
I get mail lists because of the lists narrower topic focus and the lack of off topic posts, flames, etc, etc, yada, yada, yada that
comes with some News Groups. I agree that some FS items are valid and invite a look at making a location for this type of thing.
Didn't with have a drop box type place available. A link to Netiquette may help, though the list can go as it wants, er,as,The
Manager Allows"

But anyway, the drift I get is "subject related" selling is permitted, but no flames.
Being unemployed right now, I can't afford to buy anything anyway, most of my stuff is made with junk and I end up with a lot of
small steppers, 3 phase blm, and dc motors with controllers.

Robert Ash
Re: How to establish repeatable home position w/steppers?

Hugh Prescott
 

Something simular to this is done with floppy disk drive steppers.

Home out until you trip the home switch then step to a certain phase of the
drive is energized on out.

Hugh
Very glad that floppy drives are so cheap you don't have to field align
them.

----- Original Message -----
From: Carey L. Culpepper <mr.c@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: Sunday, August 27, 2000 7:01 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: How to establish repeatable home position
w/steppers?


How about homing to the same exact step every time? To do this you need
two switching devices. One would be the index on an encoder ,if so
equipped. The other would be a switching device to indicate which
revolution of the encoder to look for. When that switch is triggered it
will look for the next index pulse to shut down.The first switch could
be an optical switch, proximity sensor, microswitch, etc.. Of course
things need to get slowed down before it gets there so it does not
overshoot.

dougrasmussen@... wrote:

Dave,

.0002" is getting into the ballpark. .000125" is my theoretical
resolution so that's what I'm shooting for.

Maybe some sort of encoder device on the motor shaft would be the way
to go?

thanks,

Doug




--- In CAD_CAM_EDM_DRO@..., dave engvall <dengvall@n...>
wrote:


There has been some discussion of limit switchs/home on the list in
the last month or so. One person was getting a thou or so out
of micro-switches ( he did not state his limit of resolution) and I
get 0.0002"repeatibiliity from hall effect devices. They might
be better than that but that is my resolution limit. :-)


Dave

dougrasmussen@c... wrote:


Group,

On an open loop stepper system how do you establish a repeatable
home
position? I'm thinking of a home position that will repeat to
within
the resolution of the machine.

I can't see that normal, every day limit switches will do the job.
Dial indicators would be a pain, but would work provided they
didn't
get bumped or readjusted. Some very old machines used a vernier
dial
which was manually stepped to position.

So, what method are most of you using?

thanks,

Doug


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Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
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Re: Maxnc - don't buy it!

Hugh Prescott
 

Used to be a video of an F-15 max performance takeoff at Lambert St. Louis,
1 minute later he was still over the airport (at 100K + altitude).

Thats impressive!!

Have a safe fourth.
Heard a nice talk yesterday about the revisionism being done to the WW II
era.
Nice gentleman, local Quincy, IL boy, WW II B-17 & B-29 pilot, Paul Tibbits
Isnt happy about it.

----- Original Message -----
From: Carey L. Culpepper <mr.c@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: Tuesday, July 04, 2000 9:29 AM
Subject: Re: [CAD_CAM_EDM_DRO] Maxnc - don't buy it!


Doug: That will work. Thanks!
Oh yeah, the F-15 is an awesome thing. I am into sportscar road racing.
Well, let me rephrase that I used to be when I could afford it. Still
have the cars though. We have a road racing track right across the road
from Pratt and Whitney here in West Palm Beach area. I remember on one
occasion seeing a f-15 drop down below tree-top level probably over the
railroad tracks or highway. Then we heard this WHUMP from him kicking
the afterburners and the next we saw him was accelerating straight up.
Awesome!


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Re: Maxnc - don't buy it!

Hugh Prescott
 

What a difference a 0 makes, sorry.

----- Original Message -----
From: Jon Anderson <janders@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: Tuesday, July 04, 2000 6:06 PM
Subject: Re: [CAD_CAM_EDM_DRO] Maxnc - don't buy it!


Hugh Prescott wrote:

1 minute later he was still over the airport (at 100K + altitude).

Thats impressive!!
Yeah, I'd say 100,000fpm rate of climb would be impressive!
(was that supposed to be 10,000?)

Jon

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N.A.M.E.S. Show

Roland Friestad
 

To: All on the list,

The N.A.M.E.S. (North American Model Engineering Society) has agreed to have
a special display space for CNC and computer-related projects and products
in the upcoming Exhibition in Wyandotte, Michigan, April 29 & 30 - There
will also be a 2 hour CNC Seminar on Saturday the 29th -

Everyone is welcome to come and display and also have some time to speak at
the seminar if desired - There is no charge, other than the nominal entrance
fee charged at the door ($3 or $5, can't remember which) - The N.A.M.E.S.
organization is doing this in order to hopefully promote more intereste in
low-cost and home-built CNC systems and related "stuff" -

If anyone is interested, please contact me for more information - I have
agreed to be the contact person and attempt to organize the operation - This
is a great show and they have a long waiting list for space so it is obvious
that they are interested in promoting low-cost CNC -

This should be a good forum to see demonstrations, meet with other
interested people, and share experiences - Your help in making this a
success will assure that they continue this project on a yearly basis -

I've conducted a CNC Seminar for the last couple of years at the show and it
has always been a standing room only deal with people spilling over into the
hall - This year they have doubled the time available and are going to try
to arrange for a larger space for the meeting -

If you can't attend but would like to have something displayed, contact me
also - We are interested in photos, samples of products or work, video
tapes, literature, or whatever you would like to display that is related -
If you have a commercial product to sell that is OK but since this is a
"freebie" they have requested that sales efforts be primarily based on an
educational approach rather than a "hard sell" - Samples or video tapes will
be returned after the show if desired -

This would be a great opportunity also to meet with some of the folks who we
all know by name from the List but have never met in person, and talk over
our mutual interests or display some of our efforts -

Roland Friestad
cardinal.eng@...
Phone - 309-342-7474
24V / 10amp DC power supplies

John Murphy
 

I'm in the process of setting up my first CNC project
and have decided to use a bunch of parts laying around my
shop. I've got some 24V DC servos with encoders on the back, and
am thinking of using the geckodrive G320's with them.

Can anybody point me to a good power supply(s) for this setup? I'll be
running
two or three motors (depending on how I get the Z axis automated) and
so I'll probably need three supplies or one supply capable of 30 amps.

Thanks,
John Murphy
Welcome

 

I am still learning all about this beast myself, so be patient. This letter
is a welcome, and a test for me. I have had quite a few wrong addresses on
invitations sent out from the list signed at NAMES, so still trying to get it
all together.
Thanks and Later
Bill
Some links

[email protected]
 

Try some of these Links for starters:

Jones on Stepping Motors
<A href=">Jones on Stepping Motors</A>

Using disk drive motors
<A href=">Using
disk drive motors
</A>

Dro Software. ( theLindsay Homepage is down right now, but hope back on line
soon, by S Lindsay)
<A href=">DRO SOFTWARE</A>


DRO Software <A href=">DRO_Plus Project -
by Tom Kulaga
</A>


Cad freeware, plus more.
<A href=">Completely
Free Software - Index Freeware Free Shareware
</A>

CNC Retro-Fit Links <A
href=">CNC Retro-Fit Links
</A>

I have nothing on EDM right now, can you help us out??

I am looking for a good source and low prices on 250 to 350 in/ounce
steppers. Any help would be greatly appreciated. Need three,

Bill Anliker
Alb.
NM
Re: Welcome

Scott Logan
 

Yeah, I know the feeling, Bill.

BTW, check the footer. "welcome to CAD/CAM/EDM/DRO@...,"??

--
Message from Scott Logan Support the anti-Spam amendment
ssl@... Join at

-----Original Message-----
From: WAnliker@... <WAnliker@...>
To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...>
Date: Wednesday, May 05, 1999 6:41 PM
Subject: [CAD_CAM_EDM_DRO] Welcome


From: WAnliker@...

I am still learning all about this beast myself, so be patient. This
letter
is a welcome, and a test for me. I have had quite a few wrong
addresses on
invitations sent out from the list signed at NAMES, so still trying
to get it
all together.
Thanks and Later
Bill

---------------------------------------------------------------------
---
ONElist: where real people with real interests get connected.

Join today!
---------------------------------------------------------------------
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welcome to CAD/CAM/EDM/DRO@..., an unmodulated list for the
discussion of shop built systems in the above catagories.
Newbie . . .

Charles Brumbelow
 

This list represents an area of increasing interest for me. I am
looking to build model and miniature steam locomotives once I retire,
but have never used a milling machine . . . and my lathe experience is
limited and dated. The idea of easily replicating a locomotive in
multiple scales is interesting.

Now a NAMES question: Was MAXNC -- a Home Shop Machinest advertiser
-- there? I have written with the SASE and
received no response. Thought it might be all were at NAMES . . .

Charles Brumbelow
Nashville, Tennessee, USA
1 - 20 of 99862