G53 Datum Shift

Hi All

Outside of BobCAM I have a question I need some help on.

Need to offset lots of holes while keeping the same datum. So program is like this

G00 X0, Y0, Z20
G01 Z-12 F1000
G01 X1.25 F1000
G03 X-1.25 R1.25
G03 X1.25 R1.25
G01 X0
G00 Z3
( )
G00 Y2
G01 Z-12 F1000
G01 X1.25 F1000
G03 X-1.25 R1.25
G03 X1.25 R1.25
G01 X0
G00 Z3
( )
G00 Y2
G01 Z-12 F1000
G01 X1.25 F1000
G03 X-1.25 R1.25
G03 X1.25 R1.25
G01 X0
G00 Z3
( )
etc for a position up to Y120

Then I need to do a datum shift in X by a distance of 2

I am guessing G52 X2 Y0 should do the job and followed by X4, X4 etc and cancelled by a G52 X0 Y0)

Am I on the right track

fidia

G0X2Y0. the next one would be G0X4Y0. Etc don't need to mess with any other codes keep it simple

Thanks, . Using a CNC router for some testing on a part. Need to punch a 0.9mm hole 2mm on center over a 120 x 140mm work piece of plastic

If I wanted to shift the X and Y datum I am guessing it would be G52 X1 Y1. See hole pattern below

X0, Y0 Y+ = --->
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o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
.o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
.o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
.o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o

Is G52 incremental each time from abs datum or previous incremental datum

fidia

This is what your program can look like, there are other ways to do it, this is in inch, just one line to change ( G73 line ) to suit your speeds feeds Etc

You should be able to do this in BobCam

Tool Path Pattern?

http://www.cnczone.com/forums/bobcad...h-pattern.html

Any good?

- Nick

Thanks for all feedback. What we are actually doing is piercing a piece of plastic with 3 needles mounted on a 3 axis CNC machine (BZT PFL-3). Hole pitch of .5mm in Y then X.

I have actually used G92 to do it.

What we need it to do is

Rapid to XY position. Plunge to -10mm. Then do an R1.25 circular interpolation. Rapid to +10mm, move 0.5mm in Y and repeat for up to 120mm in Y. Then step over .5 in X and repeat

3 needles mounted in head 12mm apart.

What I have figured out so far is to use G92 and do an X move after each line of holes in Y has been completed

G00 Z10
G00 X0 Y0
G92 X.5
G0 Z3
G01 Z--10 F1000
G01 X1.25
G03 X-1.25 R1.25
G03 X1.25 R1.25
G01 X0
G00 Z10
G00 Y0.5
REPEAT