Reamer vs. End Mill Hole Quality?

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ShagDog

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A part needs a 5/16" reamed hole about 1.25" deep. The hole diameter is not crucial within a couple of thou. I don't have a reamer that size, but I do have a 5/16" carbide 2 flute end mill. Will the quality of the hole be as good, better, or not as good as if done with a quality reamer?
 
If the size is not critical , drill it undersize and follow with a 5/16 drill . The end mill would cut oversize most likely .
 
mmcmdl said:
If the size is not critical , drill it undersize and follow with a 5/16 drill . The end mill would cut oversize most likely .
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Oversize from the end mill is fine. I just want a really nice quality finish, which per my understanding a reamer will provide.
 
Reamers are good....

Especially if you want an accurately sized, well finished hole.

What's the application?

John
 
matthewsx said:
Reamers are good....

Especially if you want an accurately sized, well finished hole.

What's the application?

John
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Crankshaft bore on flywheel for I.C. Model engine. I can turn the crankshaft to fit the bore. Might just have to break down and buy a US made reamer
 
markba633csi said:
Try your endmill vs. a drill on a piece of scrap then decide if you need to invest in a reamer
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I did the bore for the 1/2" crankshaft support with a 1/2" 4 flute carbide end mill in aluminum and it turned out fine. I just can't picture a drill doing a comparable job to a reamer or end mill.
 
I've achieved some nice finished drilled holes, but only after drilling a size under first, and using a nice fresh drill for the final size
But a reamer is best
 
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