can i get an example?

[pp-TG]

can anyone give me an example program for just the finish pass of the radius of the attached part with a .0312 tool nose radius?

[Tim S]

Here you go! A finish pass on just the radius.

%
O0000
(PROGRAM NAME - TD-1006051)
G20
(ID ROUGH MIN. 1.0 DIA INSERT - CNMG-432)
G0 T0202
G97 S1011 M03
G0 G54 X1.8897 Z.0861
G50 S3600
G96 S500
G99 G1 Z-.0139 F.01
G3 X.6508 Z-.4633 R1.0973
G1 X.5094 Z-.3926
G28 U0. M05
T0200
M30
%

[pp-TG]

thank you just what i needed ill take a look at it (may have some questions on how or why)

[pp-TG]

Tim S. did you use software for this? do you know how to mathmatically come up with your x & z numbers?

[Tim S]

I used software for this one. The radii are tricky. If I was doing this by hand I would extend the radius out as shown in the attached drawing. Extend the part radius by the nose radius of the tool on each end. Then draw a tangent circle to the parallel line and the part radius. Dimension to the edges of the circle shown to get your start point and end point. Then the R value would be the Part Radius minus the tool nose radius. If you dimension to the centerpoint of the circle make sure you add the tool nose radius to get your G-Code numbers.



Edit:
The size of the drawn tangent circles would equal the radius of your tool nose.

[pp-TG]

thanks tim, that makes sense!

[pp-TG]

Also why in the program you posted is the last g1 line going to a z-.3926
is that a mistake or just stoped there?

[CNCRim]

Are you work for Wright Medical, the part just look at like.... I worked before!!!

[pp-TG]

newtexas, No i don't work for Wright Medical, I own my own small machine shop....

[Tim S]

Sorry pp-TG - I haven't checked this until now. The G01 move after the G03 move is a clearance move to get it off of the part before rapiding out.

[pp-TG]

thanks guys for all your help.......

[wmyerscnc]

Just in case you guys might be interested, I have a software product that runs inside AutoCAD that can generate code for parts like this. There is a free demo. Also sold on Ebay. Search for CNC AutoCAD.

http://www.myerscnc.com/GCAD.htm