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Problem with cutting quality when turning
« on: April 13, 2009, 11:37:29 AM »
Hello everyone.  This is my first post so thanks in advance for helping out the new guy.

I have a problem which I believe I have narrowed down to Mach III mis-interpreting the g-code I give it.  I get a grooved pattern on the preview screen that is exactly duplicated when the part is cut.  No change in feedrate or depth of cut has any affect.  The gouges are always in the exact same place. 

First instinct says that the g-code is based on bad geometry, but this whole curve is only three lines of code, two G02s and one G03.  Any ideas?  I get perfect cuts if I go diagonally or straight.  It only does this on curves and it does the exact same thing if I use all G01s.  Any help is greatly appeciated.

Here's how the curve looks in my CAM software's simulation screen.....



and here's what it looks like in Mach III.  I would normally just attribute this to imperfect graphics, but the parts are very similar to what's on the screen.



Offline Hood

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Re: Problem with cutting quality when turning
« Reply #1 on: April 13, 2009, 01:20:34 PM »
Can you attach the code and also the xml for the turn profile you use.
Hood
Re: Problem with cutting quality when turning
« Reply #2 on: April 13, 2009, 01:31:39 PM »
Hood, thanks for replying.  Here's the relevant code;

G18
G2X0.3378Z1.0790K-0.1328I0.4212
G3X0.4566Z1.2939K0.2208I-0.1455

Not sure what you mean by xml for the turn profile.  I created the profile in Rhino, created the tool path in VisualTurn, and posted to Mach III

Offline Hood

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Re: Problem with cutting quality when turning
« Reply #3 on: April 13, 2009, 01:35:05 PM »
The xml has all of your settings, if you are using the standard turn profile then it will be found in your Mach3 folder and it will be called Mach3Turn.xml. You will need to copy it to a different location on your drive and then rename it as the forum will only accept a file being posted once. Suggest you rename it JohnWatkins.xml 
 To attach it to the forum use the additional options button on the reply page and browse to the location of the renamed xml.
Hood
Re: Problem with cutting quality when turning
« Reply #4 on: April 13, 2009, 01:40:16 PM »
a picture is worth a thousand words.....

Re: Problem with cutting quality when turning
« Reply #5 on: April 13, 2009, 01:40:54 PM »
going to get the xml file now.  thanks again...

Offline Hood

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Re: Problem with cutting quality when turning
« Reply #6 on: April 13, 2009, 01:44:37 PM »
Also could you attach the actual G Code file as well please.
Hood
Re: Problem with cutting quality when turning
« Reply #7 on: April 13, 2009, 01:49:00 PM »
trying this again.  not sure what happened.

Offline Hood

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Re: Problem with cutting quality when turning
« Reply #8 on: April 13, 2009, 02:24:07 PM »
Dont see any real issues with your profile and code looks good. I am not sure what type of motors and drives you have but you may want to try increasing the pulse width in motot tuning, try it at 3 or even 5.
Hood
« Last Edit: April 13, 2009, 02:28:53 PM by Hood »
Re: Problem with cutting quality when turning
« Reply #9 on: April 13, 2009, 02:25:33 PM »
Going to do that right now.  I'll let you know what happens.  Thanks again for taking the time.  I greatly appreciate it.