Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: tenhrdaz on February 23, 2009, 03:16:40 PM

Title: newbie confused
Post by: tenhrdaz on February 23, 2009, 03:16:40 PM
Hi
This is my first post, I have been evaluating Mach3 for several months now and have completed my 3 axis table. I thought that I had things worked out but some rather strange things are happining.

I am at this point trying to cut .050 deep and using a small g code of less than 250 lines to make sure that everything is OK.

Problem is that when cutting I get nothing but garbage.... seems that mach has a mind of its own wandering around the Axis, when running code in off line mode (air cutting or simulation) everything seems OK.

Does Mach3  not let you run code with the evaluation software??

Sorry for the dumb Question

Richard
Title: Re: newbie confused
Post by: Graham Waterworth on February 23, 2009, 03:27:14 PM
Simulation and real time cutting should be the same.

Post a picture of the screen shot and also your code that way we can work out what your problem is.

It could be just a setting in your config like Inc arcs.

Graham
Title: Re: newbie confused
Post by: tenhrdaz on February 23, 2009, 03:57:17 PM
how do i get the screen shot????
Title: Re: newbie confused
Post by: Graham Waterworth on February 23, 2009, 04:00:21 PM
We use this :-

Screenhunter 5.0

http://www.wisdom-soft.com/downloads/setupscreenhunterfree.exe

Graham
Title: Re: newbie confused
Post by: Graham Waterworth on February 23, 2009, 04:05:21 PM
It looks fine to me :-

Title: Re: newbie confused
Post by: tenhrdaz on February 23, 2009, 04:18:54 PM
is this the screen shot you needed.
Title: Re: newbie confused
Post by: Graham Waterworth on February 23, 2009, 04:25:29 PM
OK, so what is your machine doing wrong, the tool path looks fine.

Graham
Title: Re: newbie confused
Post by: tenhrdaz on February 23, 2009, 04:46:54 PM
seems that mach has a mind of its own wandering around the Axis, when running code instead of cutting the profile of the spade it cuts in diffrent directions actual photo of cut attached.
Title: Re: newbie confused
Post by: Hood on February 23, 2009, 04:51:26 PM
Are the distances accurate when you command moves from the MDI?
If you command a G0 move from the MDI does it go to the correct position?
Hood
Title: Re: newbie confused
Post by: tenhrdaz on February 23, 2009, 05:05:16 PM
using mdi and a 1" travel indicator i requested a x.125 then a y.125 and z .050 all came out right
Title: Re: newbie confused
Post by: Hood on February 23, 2009, 05:07:46 PM
Ok so can you  do a longer G0 move and roughly measure with a tape that its near.
Hood
Title: Re: newbie confused
Post by: Overloaded on February 23, 2009, 05:10:42 PM
Might also verify that the + and - directions are correct in config.
RC
Title: Re: newbie confused
Post by: tenhrdaz on February 23, 2009, 05:24:15 PM
confusion after rechecking i don't think this can be but x1.0=.075 and x-1.0=6.0 will have to followup tomorrow morning off to thr mine
Title: Re: newbie confused
Post by: tenhrdaz on February 26, 2009, 09:42:22 AM
Ok
So  i have checked and things still seem abnormal would it help to post my xml config files to try and resolve my issues.

I have seen others post to resolve there issues

Richard
Title: Re: newbie confused
Post by: Overloaded on February 26, 2009, 11:10:37 AM
Yes Richard,
  Please post your XML.
Hood or someone else will most likely decipher it for you later, it's Greek to me or I'd try to help you out.

You might go over your "Steps Per" again in Motor Tuning and make sure your calculations are correct for each axis.
RC
Title: Re: newbie confused
Post by: Hood on February 26, 2009, 01:36:52 PM
Yes post your xml. Also please give info about drives, motors, reduction if any etc.
Hood
Title: Re: newbie confused
Post by: tenhrdaz on February 27, 2009, 08:13:23 AM
4x SideStep Bi-Polar Stepper Motor Driver
4x HT23-400-4 400ozin Stepper Motor
PBX-2 Parallel Port Breakout Board
1/2-10 acme lead w/antibacklash nuts
Title: Re: newbie confused
Post by: Graham Waterworth on February 27, 2009, 11:05:52 AM
What do you have your stepper drivers set to full, 1/2, 1/4, 1/8 step or what?

Is the motor 1:1 to the leadscrew?

Graham
Title: Re: newbie confused
Post by: tenhrdaz on March 02, 2009, 05:09:21 PM
at this time it's set to 1/4 step and is 1:1
Title: Re: newbie confused
Post by: Richard905 on March 02, 2009, 08:24:28 PM
Hi tenhrdaz:

I had similar problem, please check X, Y, Z axis directions (Config--Home/Limits).

Regards

Richard
Title: Re: newbie confused
Post by: tenhrdaz on April 22, 2009, 09:45:37 AM
After taking some time off i have tried to get a grip of my problem, i have checked  just about everything i can think of and that was mentioned to try.

i keep going back to the MDI  moving the X axis +.500 and end up at .500+ - .002 now going in the minus -.500 i get approx. .750 + - .002 can this happen on the x axis, i have checked the motor wiring, plugs and attachment to the bob.

i have tried auto set pulse under settings/steps per unit if i can figure out the x axis the rest should be easy to correct.
Title: Re: newbie confused
Post by: fer_mayrl on April 22, 2009, 11:00:43 AM
Do you have backlash compensation on?

If you dont have any noticable backlash, and you have the backlash compensation on, that would give you  the .75 instead of .5.

Another thing, that could give you that would be loosing steps, try lowering your acceleration and speed when tuning your motors.

Regards
Fernando
Title: Re: newbie confused
Post by: tenhrdaz on June 03, 2009, 09:46:53 AM
After many hours of hair pulling and help from the forum, I finally got it !  turns out that two of my motor driver boards were bad.

called the company and sure enough they were bad got replacements while on vacation, installed them and ran a few test parts ...

many thanks to all who helped