Messages

4851

Show"N"Tell ( Your Machines) / Re: New Built - Beginning Stages

« on: December 08, 2012, 02:51:17 AM »

Hi Zig,

Nice work and excellent video.

However, I think you will be disappointed with the performance, later on down the line, from those drawer slides supporting your gantry.

Just a thought – fitting two more (identical) slides (rotated 90 degrees radially) underneath the bed and connected to the cross member so that they close as the others are opening (and visa versa) may give some much needed extra support to the gantry.

Tweakie.

4852

General Mach Discussion / Re: Mach and PWM VFD setup help please

« on: December 07, 2012, 08:28:29 AM »

You may find this thread of interest http://www.machsupport.com/forum/index.php/topic,15455.0.html

Tweakie.

4853

General Mach Discussion / Re: Backlash strangeness

« on: December 07, 2012, 03:30:51 AM »

Basically, as I see it, you have 2 separate issues here ‘Banding’ and ‘Backlash comp’.

I have never used backlash comp so that issue is outside my comfort zone.

If you would care to Zip and email me a GCode sample file (preferably with approx. equal sized dots) which exhibits the banding issue I would be happy to run it on my machine and post the result. This should (with luck) determine if the banding is machine or software related.

Tweakie.

4854

General Mach Discussion / Re: How can I copy & send my XML file w/o also sending my license code?

« on: December 06, 2012, 12:28:52 PM »

No worries Chris, as Gerry has said your .xml file does not contain any license information (other than the last user name or serial number) so it is perfectly safe to send.

The license team are wise to the many scams that have been used to falsely try and obtain licenses. 

Tweakie.

4855

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.

4856

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.

4857

General Mach Discussion / Re: Gcode or Vb to update tool table after probing tool length offset

« on: December 06, 2012, 07:00:15 AM »

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. 

Tweakie.

4858

General Mach Discussion / Re: Show us yor control panels

« on: December 06, 2012, 06:57:06 AM »

Excellent work Riche - very neat job. 

Tweakie.

4859

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.

4860

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.