cimco hsm crash

[RAJ]

i have uploaded cimco crash.zip on the ftp site

please can someone see why my machine is crashing on rapid move

verify looks fine eventually i changed to full retract but i want to know why min retract and shortest path are crashing.

 

thanks

[PE @ IHS]

Did you map it to feed instead of rapid? It is possible that your machine is doing 45 degree "dogleg" moves during angular G00 commands

 

try mapping to feed (i.e. 600 ipm) and see if it helps.

 

Verify would not catch those types of crashes, since they are machine specific, rather than being bad G-code

[gcode]

Most milling machines do not rapid in a straight line. The X and Y rapid independently as fast as they can.

If you program the rapid move

G00 X12. Y6.00

it wil backplot in a straight line on your screen.

 

Run it on your mill and the X and Y will rapid in a 45 degree angle to X6.00 Y6.00, then X will run

straight to X12.00.

If you had a bolt at X8.00 Y6.00 you will eat it

even though it looked fine in backplot.

 

 

As Peter said in the previous post, this is called a dogleg rapid.

The only way to catch this sort of thing is gcode verification.

 

[ 06-13-2005, 10:07 PM: Message edited by: gcode ]

[Christian Raebild]

I took a look at your file, and I agree with Peter and gcode. There are rapid moves in the toolpath that would cause crashes if your machine does dogleg rapids, and you are using shortest path or minimum retraction without mapping rapid moves to high feed cutting.

 

You need to either use full retraction, or map to high feed rate.

[Bruce Gibson]

Check the parameter settings for your control.

A machine I programmed for a customer had this problem and we were able to change the rapid option to "simultaneous".

[John T.]

Change to absolute retract. On our fadals, using the other retract methods will crash or gouge parts. What makes it interesting is that it (gouging) doesn't show up in verify.

 

John

[Henk]

quote:

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Change to absolute retract. On our fadals, using the other retract methods will crash or gouge parts. What makes it interesting is that it (gouging) doesn't show up in verify.

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Sounds to me as an post issue