Hole Sizes for Reaming

[wrustle]

(05-05-2013, 03:10 PM)EdK Wrote:

(05-05-2013, 02:59 PM)doubleboost Wrote:

(05-05-2013, 02:12 PM)EdK Wrote: I need to ream some 1/2" and 3/8" holes in some 12L14 and was wondering if 1/64" undersize is the correct size for reaming? I haven't done a lot of reaming so I'm deficient in reaming knowledge.

Thanks,
Ed

Hi
Ed
That should be fine
I use 0.2 mm undersize
Never turn the reamer in the wrong direction (but you will already know that)
John

Thanks John. I'll soon see how it goes.

Oh, what RPMs should I be using for 1/2" and 3/8" reamers?

Ed

Ed, a VERY simple rule of thumb for reaming feeds and speeds is to halve the speed and double the feed for what you would drill the material at based on the SFM of the material you are working with.

Example: .500" Dia. reamed in 12L14

.484" drill = 710 RPM 6.2 IPM

.500" Reamer = 355 RPM 12.4 IPM

Always works for me, no reason it should not for you!

Best Regards,
Russ