Subject: Re: Drilling Cast Iron

From: [email-masked] (Ken McNair)
Date: 12 Sep 1996 13:32:00 GMT

In article <[email-masked]>, [email-masked] (Ken McNair) writes:
|> 
|> In article <[email-masked]>, Russ <[email-masked]> writes:
|> |> I know the smart thing to do is to NOT try to drill cast iron but I'm
|> |> doing some work on a bandsaw and need to drill about a 3/16th inch hole.
|> |> Very tough going with my standard twist drill bits. Do we have any
|> |> machinists who can give me advice? 
|> 
|> 
|> I think drills for cast iron are ground to a lower angle.
|> I have cross-posted this to rec.crafts.metalwork;
|> someone there will be able to a better answer your 
|> question.
|> 
|> 
|> 

Correction: rec.crafts.metalworking
                                ^^^

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From: anderson <[email-masked]>
Date: 14 Sep 1996 17:26:15 GMT

> |> someone there will be able to a better answer your 

Ken-
Cast iron--recommended included pointangle is 90 degrees. 12 degrees 
relief.  
I collected the several material and drill point recommendations
and info. from drill makers'guides, Machinery Handbook and others 
sources at
http://www.darex.com/m&mtech.htm
Curt Anderson
Darex

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From: [email-masked] (MARK CENTER)
Date: Fri, 13 Sep 1996 21:04:45

slow down RPM if you usually cut wood
use a carbide tipped masonry drill if you have hard spot problems