milling Acme thd. on shaft

[SKIR68]

Im trying to mill an Acme thread on a shaft. ( like making a ballscrew). I created a helix, (spline). and then just used 3d contour and axis substitution around the shaft. It worked out great except my finish looks like facits.

I think I need to tighten up the tollerances on the spline. How can I do this? Any ideas??

Thanks for your help!

[CJep]

I used the create helix utility and setup an axis substitution toolpath. This is the code that is output using MpMaster.

 

N20 T1 M06

N25 G00 G17 G90 G54 A270. X0. Y0. S1875 M03

N30 G43 H1 Z1.125

N35 G94 G01 Z1. F8.5

N40 X-3.7492 A-1889.527 F484.62

N45 X-3.75 A-1890.

N50 Z1.125 F100.

N55 M05

N60 G91 G00 G28 Z0.

N65 G28 Y0. A0.

N70 G90

N75 M30

 

Are you getting more linear code than this??

[SKIR68]

N100G140

(MASTERCAM - X5)

(MCX FILE - F:\ACME.125.MCX-5)

(POST - MPPOSTABILITY_OKUMA_LB300MW.PST)

(PROGRAM - ACME.MIN)

(DATE - 2011.07.21)

(TIME - 9:01 AM)

(T230 - 29 DEG TAPER MILL - H0 - D0 - D0.0411" - R0.0180")

N110 G00 X20. Z32.

N120 G140

N130 G50 S6000

NAT230

N140 T23000

N150 G17

N160 M110

N170 G94 SB=6000

N180 M13

N190 M146

N200 G00 C0. M16

N210 Z-.2

N220 X1.

N230 X.7001

N240 G94 G01 X.3976 F10.

N250 Z2.375 C-855. F2249.89

N260 X.5976 F50.

N270 G00 X1.

N280 M12

N290 G00 X20. Z32. T23000

N300 M146

N310 M109

N320 M01

N330 M02

 

 

im getting roughly the same linear code, i just posted it and got one big arc, THANKS for the help Cjep!

I just assumed that because i created a spline, i would get point to point code. I never posted it out. NEVER ASSUME , I guess.

[CJep]

THANKS for the help Cjep!

 

Um OK