Messages

4541

Show"N"Tell ( What you have made with your CNC machine.) / Re: Constructing a Low Profile Tool Height Setter.

« on: May 15, 2012, 09:18:51 AM »

 

4542

Show"N"Tell ( What you have made with your CNC machine.) / Re: Constructing a Low Profile Tool Height Setter.

« on: May 15, 2012, 06:42:03 AM »

As always, Tweaks, your work is beautiful and so friggin clean! Love it!

Dave

Thanks Dave.

so your actual resolution and repeatability is?

Hi YNN,

That is a very difficult, if not impossible, question to answer. The difference between theoretical and actual resolution of any machine depends on just so many factors.

In practice, as you know, I do of lot of small engraving work which requires a high degree of positional accuracy but that does not necessarily mean that the work is done to a high degree of dimensional precision, after all, my machine is basically just a wood router but overall, when engraving, I expect to achieve a positional accuracy of better than ± 0.00625mm.

Tweakie.

4543

General Mach Discussion / Re: Charge Pump & Mach 3

« on: May 14, 2012, 06:36:29 AM »

Hi Dave,

Are you certain that the 12.5kHz output from Mach has been stopped or could it be that the C4 is just not recognizing it for some reason ??

Tweakie.

4544

General Mach Discussion / Re: Question about motor outputs

« on: May 14, 2012, 06:25:41 AM »

Hi SD,

If you imagine a square wave - active low will step (a little while after) the transition from the high point of the waveform to the low point of the waveform whereas active high will step (a little while after) the transition from the low point of the waveform to the high point of the waveform.
It is a preference of some driver chips to only operate reliably when this is set correctly (if they expect to see an active low input then this is what should be used).

Tweakie.

4545

General Mach Discussion / G31 command.

« on: May 14, 2012, 03:48:10 AM »

Hi Guys,

I would be most interested to hear of others experiences using the G31 command.

I have been using it for some years now and with the exception of having to liberally add the ‘While isMoving() / Wend’ statements to the scripts (following a Mach revision some time ago) it has worked perfectly and without any other issues.

Does it sometimes go cranky and what is the suspected reason??

Your comments would be much appreciated.

Tweakie.

4546

Show"N"Tell ( What you have made with your CNC machine.) / Re: Constructing a Low Profile Tool Height Setter.

« on: May 14, 2012, 01:42:50 AM »

But four place decimal in metric are your running servos with 8000+ encoder pluses?

 

No way, my theoretical resolution is 3 microns but so long as it does the job I leave as many of the Mach settings as untouched as I can 

Tweakie.

4547

Show"N"Tell ( What you have made with your CNC machine.) / Re: Constructing a Low Profile Tool Height Setter.

« on: May 14, 2012, 01:35:22 AM »

What the yellow piece of material for?

That is the most important part Sam - It's the work piece which subsequently gets engraved 

Tweakie.

4548

Show"N"Tell ( What you have made with your CNC machine.) / Re: Constructing a Low Profile Tool Height Setter.

« on: May 13, 2012, 11:54:11 AM »

HIYA Tweaks , Have you thought about putting in an overtravel switch so that in cause the G31 goes wacky the OT switch will trip as a Limit and save the machine/tool/probe/part ??

Just a thought, (;-)TP

Hi Terry,

Must admit that I had not thought about that - damn good idea, thanks. 

Tweakie.

It's a very poor video (this is an area in which I really must improve my skills) but shows its operation. http://www.graytel.talktalk.net/probe.wmv

4549

Show"N"Tell ( What you have made with your CNC machine.) / Re: Constructing a Low Profile Tool Height Setter.

« on: May 13, 2012, 01:06:14 AM »

Thanks Ian. 

Thank you also for your work, a while back, relating to the G31 command and Mach’s interpretation of how variations in multiple contact resets the Var (2002) etc.
This was influential in my design and helped a lot.

Tweakie.

4550

Share Your GCode / Re: I NEED THE KISS LOGO IN G CODE

« on: May 10, 2012, 10:33:26 AM »

Hi Dave,

You are right about lazyCam - but it is extremely good at what it does despite not having all the features of other software's.

Logo's attached.

Tweakie.