Messages

1

General Mach Discussion / Re: Lumps in work.

« on: August 23, 2014, 01:59:20 PM »

That thought crossed my mind too.  So  far  I  have not found it.  I  hope you are correct about it being mechanical.  This is the first table  I  ever built  and it has a few thousand hours on it.  People who see the machine then look at the work  I  have produced with it can not believe it.   I  am in the process of building a new machine.
I will probably retire this machine and rob the components off of it.  It has paid for it self many times over.

2

General Mach Discussion / Re: Lumps in work.

« on: August 23, 2014, 01:44:22 AM »

I  cut mostly brass.  Some of the mills  I  use  are .015"  diameter.  With those I  take a depth of .004"  per pass at 8 inches per minute.  Usually 6 or 7 passes for a total depth of .028".  The  run  with  that tool would take 5 to 8 hours.

3

General Mach Discussion / Re: Lumps in work.

« on: August 22, 2014, 09:00:51 PM »

By the way.  Thanks for your input.  I  hope/wish  you are correct.  That would be an easy fix.

4

General Mach Discussion / Re: Lumps in work.

« on: August 22, 2014, 08:58:55 PM »

The G 540 stopped working.  I  decided to try the Wantais because they are so much less money.  I  was pleasantly surprised  when they performed better than the Gecko.  If the problem is backlash I  should be able to feel it.  I  have  dial indicators permanently attached to each axis.  How does the machine so consistently and precisely find zero.  Why doesn't the problem wander around on the the piece.  I ran the program three times at different places on the table and the lumps occurred in the same places.  When  I  switched the wires on the x and y axes the problem still occurred in the same place on the pattern.

5

General Mach Discussion / Lumps in work.

« on: August 22, 2014, 06:14:02 PM »

I am having problems with lumps in my work.  Most of the piece will be correct however there are places where the lines have what appear to be correction jogs.
Please look at the attachment and give me some good suggestion as to what the problem is and how to fix it.
Thank you.

6

General Mach Discussion / Re: loosing steps in one direction

« on: October 06, 2011, 02:34:33 PM »

Thanks for your thoughts Ian.
I have run the G code that is called  Cross.tap  that comes on the Mach 3 cd.   I used it instead of the  Roadrunner file because it is larger.
The problem is the same, and yes it is cumultive.  That file is a little over  13000 lines after 7 runs the total amounted to approximately  .030 inches.   So far this seems to be between the driver and the G code.   Does that sound correct?   I am going to change parallel cable.
Thanks:  silveron

7

General Mach Discussion / Re: loosing steps in one direction

« on: October 05, 2011, 12:02:07 PM »

Thanks Rich
I am only loosing position on one axis.
When I switch the axis X with Y the problem switches axes also.  If it were a mechanical problem the error should stay with that axis.
I believe this would rule out noise between the driver and the motors being the problem also.  I should mention that  I had a TB6560
driver a few weeks ago the problem was similar but worse, much worse, it lost a little position on one axis and a lot in the other.
That is why I bought the Gecko  G540.
I have not been counting the moves because after running this program multiple times which would amount to well over a hundred thousand lines and ten hours of running the good axis looses nothing but the other one looses aproximately .025 per 35000 line run.  When I then switch the motor plugs X for Y the problem switches axes and the axis that was loosing steps now works perfectly even over multiple runs.
Thanks: silveron

8

General Mach Discussion / Re: loosing steps in one direction

« on: October 04, 2011, 06:47:23 PM »

I am having a problem loosing steps on one axis.  When I run a 35000 line project I loose aprox.  .025 inches on my Y axis, the  X axis comes back exactly to 0.  I switched the X with the Y and the problem switched axes too.  I am using a gecko  G540,  xylotex 270 oz. in. motors, running  20 in per min. with the acceleration of 20 percent.  I can run it at well over twice that speed and acceleration without stalling.  The kernel speed is  25000  the step and direction pulse width is  2.   This board has a charge pump that I believe is working.  I noticed a post saying he changed the pulse width and fixed his problem so I changed mine to 5 on both and am running the project now;  it takes 2.5 hours.  If that does not work does any one have any ideas.  It is 28000 pulses per inch.  This project covers an area of  .75 inch by 4 inches.
Thanks  silveron.

9

General Mach Discussion / Re: Motor tuning Mach3

« on: April 18, 2011, 10:04:12 PM »

I have a similar problem to  tk421.  My steppers are 269 oz/in ;  all components are Xylotex  which I bought about  5 years ago.
The motors only buzz; thats all I have ever got out of them.
Any Ideas?
Thanks  silveron