[ToolChatter]

Hi everyone,


I just had a weird thing happen that ruined a fairly pricey piece of stock. The program was supposed to be making a series of concentric planar endmill cuts. Instead of being planar, it cut in a helical pattern, with pretty much the entire cut being too deep. The rate of Z travel seemed to decrease as the cut went along, so that by the end there was very little Z motion. I rechecked the origin when it was done, and sure enough the Z0 was off by .103" in the positive direction. Any thoughts? Details are below.

Thanks!
Tom

BP Series II CNC
Centroid M40 controller
1" 2FL solid carbide endmill
Code:


N01 M25 G49
N02 G17
N03 G20
N04 G40
N05 G80
N06 G90


;Machine Setup - 1 Profile Rough
;TOOL CHANGE - LOAD NEXT TOOL
;PILOT
;DIA. OFFSET - D4, LGTH. OFFSET - H4, DIA. - 1.


N07 T4 M06
N08 T1
N09 S3500 M03
M00
N10 G00 G90 G54 X0. Y-4.5371
N11 G43 H4 Z1.
M00
M07
N12 Z.2
N13 Z.1
N14 G01 Z-.77 F35.
N15 Y-4.0371 F70.
N16 G17 G02 X-4.0371 Y0. I0. J4.0371
N17 X0. Y4.0371 I4.0371 J0.
N18 X4.0371 Y0. I0. J-4.0371
N19 X0. Y-4.0371 I-4.0371 J0.
N20 G01 Y-3.5743
N21 G02 X-3.5743 Y0. I0. J3.5743
N22 X0. Y3.5743 I3.5743 J0.
N23 X3.5743 Y0. I0. J-3.5743
N24 X0. Y-3.5743 I-3.5743 J0.
N25 G01 Y-3.1114
N26 G02 X-3.1114 Y0. I0. J3.1114
N27 X0. Y3.1114 I3.1114 J0.
N28 X3.1114 Y0. I0. J-3.1114
N29 X0. Y-3.1114 I-3.1114 J0.
N30 G01 Y-2.6486
N31 G02 X-2.6486 Y0. I0. J2.6486
N32 X0. Y2.6486 I2.6486 J0.
N33 X2.6486 Y0. I0. J-2.6486
N34 X0. Y-2.6486 I-2.6486 J0.
N35 G01 Y-2.1857
N36 G02 X-2.1857 Y0. I0. J2.1857
N37 X0. Y2.1857 I2.1857 J0.
N38 X2.1857 Y0. I0. J-2.1857
N39 X0. Y-2.1857 I-2.1857 J0.
N40 G01 Y-1.7229
N41 G02 X-1.7229 Y0. I0. J1.7229
N42 X0. Y1.7229 I1.7229 J0.
N43 X1.7229 Y0. I0. J-1.7229
N44 X0. Y-1.7229 I-1.7229 J0.
N45 G01 Y-1.26
N46 G02 X-1.26 Y0. I0. J1.26
N47 X0. Y1.26 I1.26 J0.
N48 X1.26 Y0. I0. J-1.26
N49 X0. Y-1.26 I-1.26 J0.
N50 G01 Y-1.76
N51 G00 Z.2
N52 Z1.

[ToolChatter]

Solved: The cutter pulled the quill down. Took me a while to realize that could happen because of the helix angle of the tool. I'll go with lighter cuts and reef on the quill lock.