Messages

2771

General Mach Discussion / Re: Vcarving to Letter Cutout

« on: December 10, 2015, 10:35:30 AM »

What I did do was change my look ahead from 20 lines to 30 lines and took my accel values down from 20 to 7.  Velocity is still set at 750.  Now running at 700 ipm this thing has almost no noticeable jerk movements.  But I do have a question about look ahead.  Is there a top value that I should avoid on look ahead so many lines?  Like 30 seems really good, but still just a tiny bit of jerking around serifs.  Just a tiny bit.  But, I'd like to be perfect on it with no jerking.  Any thoughts?

 Good question Bill, many use a look ahead of 200 so I guess it is a matter for experimentation.

Tweakie.

2772

General Mach Discussion / Re: The solutions to my false limit switch triggering issues

« on: December 10, 2015, 08:26:38 AM »

I definitely understand that information on this issue is hard to comprehend. I have chased those problems too. In fact you probably wasted some time reading my posts.

I am sure time was never wasted, everything was just added to the knowledge base. 

Tweakie.

2773

General Mach Discussion / Re: Vcarving to Letter Cutout

« on: December 10, 2015, 07:33:23 AM »

Hi Bill,

It has a lot to do with the post processor you use to create the Gcode from your CAD/CAM software.

For example...

Vectric has Mach3 post processors (which will create the Gcode to process circles as a series of straight lines) and Mach3 arcs post processors (which will create the Gcode to process circles as a series of arcs) - most CAD/CAM (that I have used) have similar options.

Tweakie.

2774

Mach SDK plugin questions and answers. / Re: 5 axis kinematics coming soon !!!

« on: December 10, 2015, 01:49:28 AM »

Video links not working (at least not for me). 

Tweakie.

2775

VB and the development of wizards / Re: G31 Feed Rate can not run less than 130U/min

« on: December 10, 2015, 01:46:38 AM »

I think you have discovered the problem.

Most, if not all, of the Chinese motion control boards fail to implement the GetVar function. 

Tweakie.

2776

General Mach Discussion / Re: Help with duel boards

« on: December 10, 2015, 01:27:19 AM »

Hi Arocky,

Yes, it is possible to do exactly as you suggest.

When you purchase the new PCI parallel port card it may be best to get one which has 5 volt TTL outputs (as opposed to 3.3 volt TTL outputs). This thread may be of interest to you https://www.machsupport.com/forum/index.php/topic,11300.0.html


Tweakie.

2777

General Mach Discussion / Re: The solutions to my false limit switch triggering issues

« on: December 10, 2015, 01:17:48 AM »

Nice work Avecnc - the methodical approach. 

Thanks for sharing the information, I am sure it will help others that follow.

Tweakie.

2778

Works in progress / Re: Krang screen

« on: December 08, 2015, 11:16:33 AM »

Excellent work Dytoven, thanks for sharing.

Tweakie.

2779

General Mach Discussion / Re: Recommended Encoders

« on: December 08, 2015, 05:29:00 AM »

Hi Richard,

I agree with you, I think the problem lies with those drivers and it looks like a fight you cannot win. It seems that the actual current is set with (what should be a potentiometer) R14 which has been replaced with two resistors. Perhaps bite the bullet and look towards a replacement such as the Gecko G540 (or similar) that way you are guaranteed a high quality product and full back-up service etc.
Spindle on/off is just a matter of connecting a relay - perhaps check out the Gecko site, there is lots of useful information there http://www.geckodrive.com/support.html
Variable spindle speed control is a bit more complicated but it's not rocket science.


Mach is not a 'closed loop' system and my advice is to forget about encoders - I have been using various systems 'open loop' for over 10 years now and I don't get lost steps so there should be no reason your CNC should not work perfectly once it is all set-up correctly with the right components.

Hope this helps.

Tweakie.

2780

Tangent Corner / Re: Why is a Poet's Day so quiet ??

« on: December 07, 2015, 07:42:58 AM »

Brilliant 

Tweakie.