[modeleng] Re: Diamond Core Drills

Hi All,

The Diamond Core drill worked a treat although I wish I had bought more 
drills.
I only bought one and after the initial bit of fast cutting it became a slow 
slog as the drill seemed to wear its way through the metal rather than cut 
it. I used an electric drill which I kept at a fairly low speed and used 
water with a touch of washing up liquid to lubricate the drill.

The ironic bit of the story is, after slowly wearing my way down through the 
bolt head, when I reckoned that I was almost down to the washer under the 
bolt head I gave it a tap on the outside with a screw driver and hammer. 
Although the remains of the head were only hanging on by a thin bit of metal 
the whole bolt spun free and I took it out using finger power only.

This raises another interesting point.

I remember years ago the theory that with the right sort of vibration the 
tightest nut or bolt will loosen off.
Bearing in mind how tight this bolt was, using the diamond core drill did I 
just happen to hit on the right combination of frequency to make the bolt 
loosen off?

I think that this technique could be used to remove broken taps or drills. 
Mind you the resulting hole will be far larger than the original intended 
hole but thats better than scrapping a valuable bit of machinery


Regards

Clif 

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