Subject: Drilling a Tapered Hole?

From: [email-masked] (Robert Lorenz)
Date: 15 Dec 1996 14:04:44 GMT

A gentleman E-Mailed a note to me asking about the Drill dr. and wanted 
to know if there is a drill made that will drill a 3/8" dia. hole that 
has a 5degree taper.  I am not a machinist, just a wantabe hobby 
machinist, but my thought would be to drill a hole then run a taper end 
mill through the hole, or perhaps there is a taper reamer available that 
is not special order.  I don't know if the 3/8"dia. is at the large or 
small end of the taper, perhaps Mr. Mickelson could tell us more of what 
he is trying to do.  I am sure that some of the real machinists could 
help him out.

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From: Ashley Palmer <[email-masked]@postoffice.worldnet.att.net>
Date: 15 Dec 1996 15:38:21 GMT

A tapered pin reamer might be the ticket.  These vary a little bit from 
the required 5 degree taper, but they are readily available.

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From: [email-masked]
Date: 16 Dec 1996 01:29:02 GMT

>the required 5 degree taper, but they are readily available.  

Seven degrees seems to leap to mind but that may not be correct. If the
project can stand it they would be a far cheaper alternative to having a
reamer made. I doubt I would like to try and drill a tapered hole as a
drill predominantly cuts on the leading lip, the flute-lands are more for
alignment than cutting.

Peter

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From: [email-masked]
Date: 17 Dec 1996 00:29:20 GMT

In article <[email-masked]>, [email-masked]
(Robert Lorenz) writes:
> I am sure that some of the real machinists could 
>help him out.

Sure, I thought it was obvious.  This job clearly requires a 5-axis CNC
machining center.      :-)

                                 - Marc