Re: Making Flat secondaries - disaster #1...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

drilling plastic can be easy or a mess. If the plastic is flexable the
material jumps up and causes a mess. This can be stoped by using a top plate
of wood to hold it down. If you turn the drill to fast or feed the drill to
fast it will grab, Making the drill bit flatter also helps. This stops the
bit grabing a big chunk.Wood drills with the cutting edge on the outside
also work for flexable plastic when drilled from both sides. Solid plastics
don't cause much problems if fed slow. A drill press helps.
   Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Thu, 21 Feb 2002 17:24:27 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: Making Flat secondaries - disaster #1...
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Thu, 21 Feb 2002 17:43:28 -0700
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Goinbonkers-at-aol-dot-com>
> 
> I am not understanding the difficulty here.  I have drilled a lot of holes in
> Plexiglas and have had no trouble at all.   A good sharp bit and clamping it
> securely to a piece of plywood on my drill press is all I ever did.
> Mike 
> 
> 
> 
>> 
>> I have to disagree with this, Trying to drill a 1\2" hole that is pre
>> drilled will definitely grab into the part!
>> A real good bet when drilling acrylic and lexan is to grind your bit
>> into a very wide included angle, the included angle should be around 160
>> deg. so that it chips away at the material, not cutting into it.
>> Also, I have found that straight mineral oil used as a lube on jig saw
>> blades, or drill press bits and hand tools will allow a good clean cut
>> with little cleanup.
>> drilling acrylic is much like drilling cast iron, (except for the
>> melting at high cutting speeds) If slightly less then flat cutting
>> angles are used it will peel the material out of the hole very nicely
>> with mineral oil as a lube.
>> Hope this helps,
>> Marc M. 
>> 
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