I have a routine that lets me mill a deep circle in several passes,
typically to cutout circles from plates.
Something strange is going on and the resulting shape is not exactly round.
It can be best described as a circle with humps.
The routine is below. It is basically a while loop, milling progressively
deeper until Z reaches the required depth. Every loop consists of two half
circles milled helically, with the end mill going down along a spiral.
Any idea why the shape may not end up being circular?
Thanks
Routine attached.
(Copyright - Igor Chudov, released under GNU Public License V3)
O<circulargroove> sub (circular groove, good for milling through holes too)
#<xc> = #1 (X center)
#<yc> = #2 (Y center)
#<safez> = #3 (safe height)
#<depth> = #4 (depth of milling)
#<radius> = #5 (outside radius)
#<milld> = #6 (end mill diameter)
#<frate> = #7 (feed rate)
#<zstep> = #8 (z step, per circle, optional)
O<if> if [ #<frate> NE 0 ]
F#<frate>
O<if> endif
O<if> if [ #<zstep> EQ 0 ]
#<zstep> = [#<milld>/3]
O<if> endif
#<z> = #<safez>
#<r> = [#<radius> - #<milld>/2]
G0 Z#<safez>
G4 P0
G0 X[#<xc> + #<r>] Y#<yc>
O<loop> while [ 1 ]
O<if> if [ #<z> - #<zstep> LT #<depth>]
#<zstep> = [#<z> - #<depth>]
O<if> endif
G2 X[#<xc> - #<r>] Y#<yc> Z[#<z> - #<zstep>/2] R#<r>
G2 X[#<xc> + #<r>] Y#<yc> Z[#<z> - #<zstep>] R#<r>
#<z> = [#<z> - #<zstep>]
O<if> if [ #<z> LE #<depth> ]
O<loop> break
O<if> endif
O<loop> endwhile
G2 X[#<xc> - #<r>] Y#<yc> R#<r>
G2 X[#<xc> + #<r>] Y#<yc> R#<r>
G0 Z#<safez>
O<circulargroove> endsub
M2
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