[Mancini]

I am trying to program an I.D. Radius of 1.1725" on a prototype part yet I have never done anything close to this; if anyone can help it would be greatly appreciated.

http://s1233.photobucket.com/albums/ff389/haaswork/?action=view&current=68e6c5bf.jpg&evt=user_media_s hare[/IMG]

[KenFoulks]

How many parts do you have to make? What is the material?

[Geof]

Doing a complete semicircle like that can be a problem because there is no clearance for the backside of a boring tool so I have got around the problem by using a ballnose end mill as a boring bar and programming to the center of the ball. This means you need to subtract the ball radius from your dimensions so the 2.345 becomes 1.845 and the 1.1725 becomes 0.9225 when using a 1/2" ballnose.

This little bit of program will do it starting with a 17/32 drilled hole down to a few thou less than the full depth of 1.1725.

Changing Setting 73 to 0. is necessary to use a G71 cycle otherwise when the tool retracts it gouges the opposite side of the radius.


%
O00001
T1 M06
G00 X0. Z0.3
M03 S1000
G71 P10 Q20 U0. W0. D0.06 F0.005
N10 G00 X1.845 Z0.25
G01 Z0. F0.005
G03 R0.9225 X0. Z-0.9225
N20
G70 P10 Q20
M09
G28
M30
%

Because this is programmed to the tool center it does not use compensation so you cannot adjust the size in wear you have to tweak the program coordinates.

[Mancini]

Yes that helped tremendously, thank you; now I just need to tweak in my entry radius and solve the clearance/tooling issue and I'll be good to go; your time and knowledge are both greatly appreciated.