Dynomotion

Group: DynoMotion Message: 11258 From: jayenglehaupt Date: 3/24/2015
Subject: k motion 4.33k cuttter comp
Hi Tom,
I hope you can help me with cutter comp. attached is a file that came out of my cam system.It has all the proper code for cutter comp. Its  a 1.00 dia with a lead in and out for ccomp and arc raduis in and out. I use cutter comp on all tool path. Except for complex 3d and engraving. I am a cnc programmer by trade at my company. And this code runs fine on other eqiupment. I have recently retrofited my mill at home and am very pleased with your product and forum support. The prg is basic and if i run it in g veiwer without comp the path is exactly what i program in the cam system. this program is tool center and not diameter. when I add comp
is when problems occur .Could you please take a look at the program in g veiw and then try to add comp and you will find my issues.I am using .250 dia tool in program Thanks for your support


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Group: DynoMotion Message: 11275 From: Tom Kerekes Date: 3/27/2015
Subject: Re: k motion 4.33k cuttter comp [1 Attachment]
Hi Jay,

We probably need to work on cutter compensation.  Doing some research it seems the better systems perform a lookahead past the first Approach Move to adjust the motion length of the Approach Move to end up on (and tangent) to the specified profile?

Our GCode Interpreter and cutter compensation was taken from the original public domain NIST EMC code.

I was able to adjust the Approach Move of your code to run without errors.  See the attached GCode, the attached diagram, and two GViewer Plots showing the path with/without compensation.

If anyone has any insight please speak up.

Regards
TK