On Sat, 11 Jul 2020 at 16:11, Gene Heskett <[email protected]> wrote:

> I need to drill 6 holes in the face of a nema-23 adapter I'm making for a
> bigger 100/1 worm drive.  That bolt circle is nominally 64.8mm in
> diameter so i feed arcgenm18,py 0,0,64.8,0,60 and click show me.  The
> first line of the answer is the offset, driving the machine to the
> center of the first hole at 3 oclock on the circle.

There is no need for this level of complication to spiral down full circles.

; relative are centres
G91.1
; Go to first hole centre point
G0 @32.4 ^0
; offset to required radius
G91
G0 X1.1
G90
;Touch the top
G0 Z0.5
G1 F100 Z0
; Spiral down 4 mm in 8 turns
G2 Z-4 P8 I-1.1
; finish out the bottom.
G2 Z-4 I-1.1
; and next
G0 Z 10
G0 @32.4 ^30
...

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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