CONTOUR MILLING BALL ENDMILL

[HEAVY METAL]

I'm i thinking about this correctly. Say i have a 1 inch ball and a 1/2 inch ball cutter. will i be able to take a twice the step over with the 1 inch and still achieve the same surface finish compared to using the 1/2 ball with the smaller step over.

[Guest]

No. Not according to my calculations. For example if a .0001 cusp height is desired with a .5 ball the step over would be .0141 and with a 1.0 ball would be .02

HTH

[DavidB]

You wouldn't get the same finish although the cutter is twice the Diameter the contact erea is not twice as big.This theory would only work on a flat end cutter.

 

[Guest CNC Apps Guy 1]

Ok.

 

With a 1" BEM stepping over .023 your CUsp Height will be .00055

 

With a .500 BEM stepping over 1/2 that, your cusp height is .00007

 

Figure from that...

 

James the special ed math graduate

[HEAVY METAL]

My boss who I have great respect for told me this and after I thought about it I didnt think he was right. Thanks fellas for the info

[Heavycut]

quote:

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With a 1" BEM stepping over .023 your CUsp Height will be .00055

---

James I get something little different:

 

With a 1" BEM stepping over .023 Cusp Height will be .00013 ???

[Guest]

+1 Heavycut

 

James you need to go back to the special ed math class and get a refresher.

[Guest CNC Apps Guy 1]

Hmmmm. Perhaps how I calculated it was incorrect.

 

I created a circle at 1" Dia. Translated it .023. Created a line tangent to 2 arcs. Then created a line vertical from the mid point of the line to the intersection of the two arcs and measured that line. Did I do it wrong?

[jplecan]

I drew it up in Mastercam and measured .00013 for the 1" ball e.m. also. Now if you would go to a bigger tool a 2" ball e.m. at .023 steps would leave .00007 cusp height so maybe that's what the

Heavy Metal's boss was thinking.

 

Jim

[mold100]

Its a tangency thing, the only thing thst is partially true is the bigger the ball the bigger the step can be, I am not sure if there is a known ratio or not.

[Guest CNC Apps Guy 1]

I did it again to do a sanity check... and I did get .00013 for the 1" BEM. MUst've selected a bad spot the first time.

 

James teh I NEED a vacation!