Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: M250cnc on November 22, 2007, 10:45:52 AM

Title: Canned Drilling Cycle Problem
Post by: M250cnc on November 22, 2007, 10:45:52 AM

Hi all.

Why does using the drilling canned cycles change constant velocity to exact stop. >:(

Is it possible to keep constant velocity when using drilling canned cycles

The Code i am using "G99 G83 Z-10. R-5.6 Q2. F15."

Phil_H

Title: Re: Canned Drilling Cycle Problem
Post by: Graham Waterworth on November 22, 2007, 11:50:13 AM

I think its the G80 that kills all modal commands, I asked Art about changing this some time back, so everything went back to how it was before the cycle call, but it sounded is if that may be a major job.  Maybe in Quantum.

Graham.

Title: Re: Canned Drilling Cycle Problem
Post by: M250cnc on November 22, 2007, 12:58:45 PM

Hi Graham thanks for the reply. That is bad news. Come on Art forget Quantum, fix Mach. ;D

As i lose position every time i run the part, i will do a subroutine for the Z axis.

But i am unsure of the correct syntax for subroutines i have searched the forum and found none, i have only seen the examples in the PDF manual.

Do you have an example to hand ?

The machine works fine except in exact stop mode

Phil_H

Title: Re: Canned Drilling Cycle Problem
Post by: Graham Waterworth on November 22, 2007, 01:08:53 PM

you can do it like this:-

%
G20 G40 ETC.

G00 X0 Y0
M98 P1
G00 X1. Y1.
M98 P1
ETC.
M30

O1(SUB)
G00 Z-5.6
G01 Z-8.6 F15
G00Z1.
Z-8.
G01 Z-10.
G00Z1.
M99
%

Graham.

Title: Re: Canned Drilling Cycle Problem
Post by: M250cnc on November 22, 2007, 01:56:29 PM

Thanks Graham

Phil_H