[sdiy] Special tools for SMT
steve at bendentech.co.uk
Mon Feb 14 12:45:21 CET 2022
On 12/02/2022 17:06, Oren Leavitt via Synth-diy wrote:
> On 2/12/22 10:35 AM, Mike Bryant wrote:
>> As an 11 year old at my school a long time ago one of the things we
>> had to make in metalworking class was a screwdriver. Put a rod of
>> metal in the lathe and slowly turn it down to the required shape,
>> then grind the end to a flat blade.
>> Never did find a use for it !
>> The other thing we had to make was to beat a circle of copper to form
>> an ash-tray. Things were definitely different in those days :-)
> My "useless" screwdriver I made in metalworking class consisted of
> steel or iron rod that I heated in a forge. While hot, I hammered one
> end flat and then ground it into final shape. This was then reheated
> and then quenched in water to temper it. For the handle, I placed the
> rod with the finished blade in a sand mold with a space to pour molten
> aluminum to fill out the handle. Finally I ground the rough edges of
> the mold seam off the handle.
> Viola! A pry bar that thinks it is a screwdriver :)
Happy memories! At my middle school in the mid-80s we did exactly the
same thing as Oren, though we went a step further by turning the cast
handle down in a lathe then knurling it. The results were actually quite
attractive and I still have mine somewhere. Metalwork was proper
hands-on in those days, training us (you might say) for jobs which no
Going well OT, the pinnacle of metalwork classes at that school was the
building of a Mamod-style steam engine from scratch. As I went up
through the school, I watched the final-year students running their
engines up and down the corridor outside the metalwork room and yearned
to build my own.
(Only recently, I discovered that the engine design almost certainly
came from this 1972 book:
Of course, just as I reached my penultimate year, the powers-that-be
realised that nobody needed hands-on metalwork skills any more and
totally rejigged the curriculum to concentrate on design skills. No more
steam engines. I was gutted, and it still rankles nearly forty years
later ;-) Perhaps I should buy that book...
Benden Sound Technology
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