CAM or CNC Issue

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17 Nov 2014 03:21 #53146 by invntr
CAM or CNC Issue was created by invntr
I just ran my first part route and the piece came out very poorly. It was a basic vacuum shoe for my machine, so not very complex. The holes were not symmetrical at all, and the diameters were completely off. I am using Meshcam for CAM which is inexpensive, but for something this simple it should be okay. How does one test whether the problem is with the CNC machine or with the CAM software? Any help would be greatly appreciated. Thanks in advance!

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17 Nov 2014 04:40 #53151 by BigJohnT
Replied by BigJohnT on topic CAM or CNC Issue
You write some code by hand you know is correct and test with that.

JT

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17 Nov 2014 10:20 #53155 by invntr
Replied by invntr on topic CAM or CNC Issue
Thanks, but I don't know gcode. Is there an alternative by chance? Thanks.

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17 Nov 2014 16:50 #53160 by Rick G
Replied by Rick G on topic CAM or CNC Issue
You can start by comparing the information and display on your screen to what you are expecting. Does it look like what you drew? How does that compare to what your machine produced?
You could install ngcgui and try some of the sample programs. Perhaps backlash.ngc
linuxcnc.org/docs/html/gui/ngcgui.html

Rick G

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17 Nov 2014 21:35 #53171 by BigJohnT
Replied by BigJohnT on topic CAM or CNC Issue

invntr wrote: Thanks, but I don't know gcode. Is there an alternative by chance? Thanks.


You need to understand basic G code to be able to troubleshoot your CAM output.

gnipsel.com/linuxcnc/index.html

The basic G codes are G0, G1, G2/G3. If you have spindle control then you need to understand Sn and M3/4/5.

Type the actions you want to do in words then translate to G code, obviously only the G code can be in the program file unless you place a comment marker in front of the comment.

Rapid to X1.000 Y-1.000 translates to G0 X1.000 Y-1.000

linuxcnc.org/docs/html/gcode/gcode.html

Create a G code file to make a square and run that. You can do that with 6-7 lines of G code.

JT

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19 Nov 2014 04:23 #53198 by Rick G
Replied by Rick G on topic CAM or CNC Issue
In addition to John's answer check G20 or G21, inch or millimeter
linuxcnc.org/docs/html/gcode/gcode.html#sec:G20-G21-Units
Make sure both your machine and the software creating the code are using the same.

Rick G

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