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Surface Finnish Raster Help


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Looking for some advice.

 

Material 4140HT 

Material Left for Finnish is .005 thou

 

Finnish tool path is Raster ( zig zag ) and coolant

tool is 3/4 ball ( dijet indexable )

 

Feed 115 Rpm 8000 with 0.011 step over

 

problem is surface finish, tool tip is wearing out.

 

Size of plate is 41.00 " x 16.00 "

 

What can I do to make surface finish better from start to end.

 

This is just for the top surface, I water line other details and that is fine.

 

Any help would be great.

post-17684-0-21939900-1472121488_thumb.jpg

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I just ran some parts similar to what you have. 4140HT, 42in x 12in and finished with a Garr VRX bull mill. The finish path was just over 5 hours at 130ipm/5900rpm 0.01in step over. Are you finishing the entire part raster? Looking at your pic I would only run about 60% of that part with a surf fin path. The two large open pockets and the three smaller pockets should be finished with area mill.

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I just ran some parts similar to what you have. 4140HT, 42in x 12in and finished with a Garr VRX bull mill. The finish path was just over 5 hours at 130ipm/5900rpm 0.01in step over. Are you finishing the entire part raster? Looking at your pic I would only run about 60% of that part with a surf fin path. The two large open pockets and the three smaller pockets should be finished with area mill.

 

My first operation is with a 2.0" high feed mill leaving .005 whole part

2nd / 3rd operations restmill tool paths to bring all surfaces leaving a constant 0.005

4th Raster top 3/4 ball mill

5th water line

6th and on 2d tool paths and drilling reaming etc..

 

Problem is surface finnish the top part of form,  Tool tip wearing out.

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