[Hallicrafters] drilling glass

[Gary Pewitt]

Substitute 1/4" copper pipe for the drill bit and grinding compound for 
the lube.  The copper will allow the grinding compound to embed and it 
will make a nice clean hole.  I used to make Hookas for the dopers at 
school that way.


On 3/20/2014 1:16 PM, Mark Shaum wrote:
> One tip I recall when I last had to drill about a 1/4 inch hole 
> through a fairly thin glass sheet was to use putty to form a little 
> ring around my drilling center point.  Then you can fill your little 
> putty "volcano" with lubricant/coolant and drill with a sharp, carbide 
> bit at slow speed and slow feed.  This helps keep the lubricant and 
> glass particles flowing away from the hole as it is drilled without 
> having to drip lubricant on the glass on a continuous basis.  Clean 
> out the hole as drilling progresses, continue as in the beginning.  I 
> must admit I only did this twice, once to test the technique and once 
> to get the hole I needed through a glass window pane, but it worked 
> fine both times.
>
> 73!  Mark, K9TR
>
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-- 
Gary Pewitt   N9ZSV
1500 French Prairie Rd
Booneville, AR  72927