Hollow drills

[Barrie Heaton]

Thank you all for your replies we shall seek some out.

I am a sucker for off the shelf gadgets and toys to make life easier and
|I also like the idea of making my own tools.

I have a similar device for cleaning the glue of  damper barrels which I
made out of alliminium tube.

Regards,

Barrie.



In article <199705061503.KAA26943@onyx.southwind.net>, Ron Nossaman
<nossaman@southwind.net> writes
>Hi all,
>
>In a pinch (needed one NOW), or if you need a smaller size than is commercially
>available (had a rash of broken BRIDGE PINS in a church piano once, broke just
>below the bridge surface), make what you need.
>
>Get a length of water harden, rather than oil harden, drill rod of the
>appropriate diameter from an industrial supply. Cut off a two inch length, or
>so, and save the rest for the next time. Square the ends up on a bench grinder,
>and chuck it in a drill pr
>
>ess. Put a center drill in the drill press vise, set your speed to low, and
>center drill both ends of the piece. If you've never done this, you are in for a
>treat. Feed the work slowly down on the center drill with one hand, centering
>the bit underneath b
>
>y feel. If you're careful, it will center nearly automatically. Exchange the
>center drill with a jobber's bit of appropriate size, and drill clear through
>the length. You might have to sneak up on it with multiple passes of
>increasingly larger bits to rea
>
>ch the final size, depending on what the final size is. This material, although
>unhardened, is pretty tough.
>
>Grind or file whatever you want for teeth, a Dremmel cutoff wheel is a "quick
>and dirty" for this one. Harden it, or not, as you wish. Unhardened, it will get
>you through a lot of holes with an occasional tooth sharpening. Hardened, the
>teeth hold an edge
>
> better but you'll more probably break it and be making another one. Hardening
>consists of heating to bright cherry and water quenching. Tempering afterward
>(heating to straw color and quenching) makes it less brittle, but is a touchier
>process.
>
>If you have the tools, it's worth the fifteen or twenty minutes if you need it
>immediately, or are the pathologically independent type. <G>
>
>
> Ron Nossaman
>





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Barrie Heaton                                  |  Be Environmentally Friendly
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