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Messages - Tweakie.CNC

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5591
General Mach Discussion / Re: Backlash strangeness
« on: December 06, 2012, 11:36:30 AM »
OK, I understand how it was done.

If the bottom left hand dot for each box was always approached in the same direction then any backlash would have been taken up in the same direction so would it really be the cause of the problem - I am not sure.

I know it does not solve this issue and I am not sure if it will be of any interest to you but there are alternative methods of producing images from dots or drill holes which produce the image one complete horizontal line at a time which would not be affected by a small amount of backlash which occurs with bi-directional working.

Although I produced this image using a laser it is essentially just a series of small holes or dots which could just as easily have been produced with a drill (although it may take considerably longer to complete due the Z axis movements).

Tweakie.


5592
General Mach Discussion / Re: Backlash strangeness
« on: December 06, 2012, 10:39:33 AM »
I understand what you are seeing now.

How is the image created ??  ie. from a horizontal axis travel across the whole picture, one line at a time or some other method.

Tweakie.

Addition;

Just read your first post again and assume that you are doing it horizontally in 1" wide vertical stripes. Although it is a very small amount backlash could well be the issue here.

5593
Quote
once i have the code done i will post it for all! well at least for the experts to pick to shreds

No worries Jestah - the experts would not do that.  ;D

Tweakie.

5594
General Mach Discussion / Re: Show us yor control panels
« on: December 06, 2012, 06:57:06 AM »
Excellent work Riche - very neat job.  ;)

Tweakie.

5595
General Mach Discussion / Re: Y code differance
« on: December 06, 2012, 06:45:46 AM »
May be worth checking that you do not have a loose coupling between your motor and leadscrew (check grubscrews etc.) also check that everything else (leadscrew nut etc.) is tight.

Tweakie.

5596
FAQs / Re: Jerky Movement on all arc's
« on: December 06, 2012, 02:13:48 AM »
It could be related to the CAD / CAM software you are using to create the GCode. Not all software creates arcs - some just produce a series of straight lines and this could explain the jerky motion you are seeing.
Check your GCode to see if it contains any 'J' codes or perhaps zip and attach an example of your GCode.

Tweakie.

5597
General Mach Discussion / Re: Backlash strangeness
« on: December 06, 2012, 02:07:08 AM »
Hi Ansen,

I am most interested in this but cannot quite see exactly what you mean by 'banding'.

I notice variations in 'shade' in the top example but it appears that not all your dots have been filled with ink.

Presumably you are producing the pattern bi-directionally and that is why you think backlash comp may help but I would like to hear more details of the problem you are seeing without backlash comp being used.

Tweakie.

5598
If you go into Config / Ports & Pins / Motor Outputs just change the 'Dir Low Active' state for the Axis in question. That will reverse the motor direction and resolve the issue.

Tweakie.

5599
Hi Lee,

Welcome aboard.

Tweakie.

5600
Quote
Specifically what should the most basic VB script commands be for output 6 ON and then a later  script for OFF be.

The commands for ON and OFF...

ActivateSignal(OUTPUT6)

DeActivateSignal(OUTPUT6)

Tweakie.

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