Hole Finish Bad

[RStuart]

Anyone know what I can use or do to get a good finish in a 1" angled hole with an interrupted cut at both the start and finish of the hole?Tolerance isn't all that critical say +/- .050. Thanks in advance. By the way 316L SS.

[Thad]

What type of finish do you require?

 

Thad

[chris m]

Is a flex hone practical for this?

 

Roller burnish, maybe?

[RStuart]

The hole will get polished manually after machining. Just trying to cut down on the manual polishing time.

[Tim Johnson]

Can you interpolate the hole? If you can, drill leaving .010 material then use a tapered end mill to finish. We get 32 finishes consistantly in 304.

[steve f]

Helical mill with 1/2" endmill using a z depth of about .02" per pass to rough out, since it's interupted, and circular mill at full depth of cut with slow feed and rpm to finish. I used to finish insert pockets for injection moulds this way that were 3" to 4" deep using a 3/4" solid carbide 4 flute endmill at about 600 rpm and 6 ipm...came out looking like a mirror and accurate as long as runout is bang on.

 

HTH

 

steve

[herbert west]

is this a tapered hole or is this a hole set at an angle?