Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Satbeam on May 26, 2008, 06:02:26 PM
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I'm having a relay hard time tuning my 3 motors . I need lots of help . The motors are 3 (MT23-60-5 Uni-Polar Stepper Motor) .
Here is a little more about them -
60 Oz In. Hybrid
1.8° /200 Steps Per Rev.
24 Volts*
0.18 Amps Current Draw Per Phase
5-wire Uni-polar
NEMA 23 Frame
How can I get all of them to run at Maxim speed toghter ? I have one running smooth , non of them will work on same numbers . The other 2 motors just bog and grind , I need HELP .
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A few troubleshooting tips, have you tried all the motors on the output that runs smooth? Being careful to power down before swapping motors/wires. What type of controler are you using? That would go a long way in someone knowing the possible adjustments of the controler that may be affecting things and eliminate settings in Mach as a source of trouble.
The more specific information you can provide the easier it will be to get an answer and solution.
Kristin
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You may not get all axis moving with the same numbers. If your steppers are boderline the heavier or more friction an axis has then the slower you will have to set it.
Best thing to do is set the acelleration and velocity way down, start increasing the Velocity and see where you end up loosing steps. Once you have that put it back a bit and start increasing the acell step by step until you loose steps and turn it back a bit.
There is no real way of knowing what numbers you will end up with unless you know someone who has identical machine and harware, even then you may find the numbers will be different although probably not dramtically.
Afraid its all trial and error :(
Hood
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Stick with it you will get there in the end.
In my case i first started with one motor off the machine connected lying on the floor in a nice comfy room.
I had read what others were getting in terms of speed but when i tried my motors stalled "Loud Screeching"
This was the fact that the power supply voltage was too low 24v the same as your setup.
I changed drivers and power supply "64v" and now it's as sweet as a nut.
The motors seem a bit on the flimsy side power wise. What is the size of the machine ?
Phil_H
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The only other info I have is that the brake out boards & the Stepper Motor Drivers are not sold their anymore . I've picket them up (http://www.probotix.com/stepper_motors/mt23-60-5/)
I've been trying everything all of you have suggested . I'll keep trying the trial and error and will get it sooner or later .
This is my first time with anything like this . I made the CNC maching , that was not that hard . Its the softwear that I'm having lots of problems with . That's my week spot , softwear .
If There is anyone in the South Bend or Elkhart , In. that could give me a helping hand , I could use some coaching if anyone is instread .
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I am reading around here also trying to get information on motor tuning. I am using a Taig mill with the controller from DEEPGROVE off EBay and the motors were originally setup over the phone with another user of the same mill/setup. He basically had me move the curves around until the motors were running smoothly... and that was it. That was about a year ago and now I am learning enough to start using the mill (barely) and the motors are sill working fine... but in the Z and Y I get a bump-bump-bump and the hesitate about every 2nd revolution when I jog them... but they seem to be smooth when the controller is driving them. Should I be concered? attempt to correct? and if so... how? The motors also get quite warm...
thanks so much,
Larry
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I'm Back - I'v read and followed all of every ones suggestions and steal can't get this tuned . Can't get it do not under stand it . Is there any peace of hardwear or softwear (that I can add on to make it automatically detect and set the moteres) ?
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If you find it.. I would be glad to use it as well. Mine still work... but one motor has a hitch about every 2nd revolution and another has one about every 3/4 revolution. All I have ever been told is just screw around with the rates until the motor works properly.. and then leave it alone.
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Satbeam,
Can you post a picture of your machine?
Do you have board and driver information on what you bought?
You said you "don't understand it", like steps, acceleration, velocity, etc.?
Depending on your understanding we may be able to tailor how we respond back.
RICH
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I can tell you that I am using a standard TAIG Mill from Deepgroove using his controller.
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Have you guys tried Sherline mode?
Hood
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I'm sorry... I don't even know what that means. I will be more than happy to try it though, it there a tutorial or brief explanation?
Thanks in advance
Larry
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also sounds as if you have some binding in the ballscrews or slides , refering to your point of bump bump every 2 revs , try removing the steppers and turning them by hand
to feel for any roughness binding or stiffness first, both on your slides and screws , make sure your sliding surfaces are clean and greased too .
if all the motors are the same type , then the same settings should get you near or at least into the ballpark and then fine tune from there
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On the Ports and Pins main page you will see an option for Sherline 1/2 Pulse Mode, choose that and restart Mach and see if it helps.
Hood
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I will give the Sherline mode a try and see what happens.
The motors were fine, and brand new and moved fluidly without any hesitation or "bumping" as I described it. The mill sat for about a year with no real use because of my inability of handling the software, but with the help of someone who had a Taig mill I was able to get the motors installed and setup. It was only after moving the mill to a new location and a new hard drive after the old one crashed that the bumping problem came along. I can manually jog the motors and mill some parts and it appears to work reasonably well, but I know that they can be smoother as the one axis is. I have tried using that setting on the other two motors but it didn't cure the problem.
Thanks
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I would definitely recommend that you watch the tutorial videos, AND read the manual several times over to get a good basic understanding of everything. People are more than willing to help around here when they can, but its hard to explain things when the other person doesn't understand the basics. When somebody says "Sherline mode", you will remember seeing that in the video and you can go watch it again. The manuals go into pretty good depth on most things, so at least just scan through it a few times and pick up on the basics. Help us to help you.
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I Finley found out what my problem was , my settings wear wrong . The velocity was to high and my acceleratoin was to low . I turning them around and I got movement . Tuned a little and got them running ok . When I tried to engrave something it only moves in a very short space .
As far as my new problem , I'll do somemore reading . Could not get my pick to upload , must be to large .
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Are you meaning that the fcode works ok but is much smaller than you think it should be? If so then its either you have scaling, have it set in mm and are using imperial code or your Steps per unit are set wrong.
Hood
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I'm very new to this , what is the fcode . I use inches . When I try to run g code the table hardley moves . I guess that is my next step is . The question I have is what I set the backlash at .
Are you meaning that the fcode works ok but is much smaller than you think it should be? If so then its either you have scaling, have it set in mm and are using imperial code or your Steps per unit are set wrong.
Hood
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OOPS
fcode is the same as gcode, just I have fat fingers and missed he G and pressed F instead LOL
OK as I said above either you have your steps per unit set wrong, if you go to the MDI line and type G0X1 does the axis move 1 Inch? If it does then it looks like your G Code has a G21 at the start, this means that its getting changed to mm, so if the code says G1X5 F50 it will only move 5mm rather than the 5 inch its supposed to.
If thats not the case then have a llok at the scaling to make sure you dont have that set to reduce your code.
Cant tell you what to set your backlash at, you need to measure the backlash as each setup is different.
Hood
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This advise might be stupid but...are you saving the data for each axis?
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Yes I have , every change I make I save it . Thanks for asking .