Subject: Q: How to use a chucking reamer?

From: [email-masked] (Bill Webster)
Date: 6 Nov 1995 13:37:23 GMT

I'm making a cylinder for my model airplane engine.  The finished bore
should be .410".

I've seen in catalogs a few differnet types of chucking reamers.  In
particular, a spiral and straight type.  Which is the type of reamer I
should use for my application?  My final fitting will be hand lapped.

And, how do you properly use a chucking reamer in a lathe?  I'd expect,
generous amounts of cutting fluid, go slow.  Is the reamer held in the
tailstock with a collet?  Or, is a chuck used?

Lastly, how much material should be left for the reamer to ream?

Thanks in advance.

regards.

-- 
Bill Webster   [email-masked]

---

From: [email-masked]
Date: Tue, 07 Nov 95 19:33:47 PDT

>tailstock with a collet?  Or, is a chuck used?

Chucking reamers are usually used in a drill chuck,  (hence the name) because 
their shanks are usually an odd size, and soft enough to be gripped by the 
chuck.  Use a good supply of cutting fluid, (depending on what material the 
piece is made of.  Feed slowly at low rpm.  BTW, Spiral reamers are usually used 
in deep holes to help clear chips.  Straight reamers are prefered for short or 
blind holes.  

>Lastly, how much material should be left for the reamer to ream?

This also depends on the material used, you never want to overload a reamer, as 
it will affect the hole size and quality.  On a .410 bore, I would drill a .250 
hole first, open with a 13/32 (.40625) using plenty of fluid to keep the finish 
good, then ream.  The pilot hole will stabilize the larger drill and help it cut 
"on-size".  

[email-masked]