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Posted by Emimec on August 12, 2008, 4:48 pm
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>I spoke tripe.Early dementia! The two outsides of the tapers will be
>parallel.
>
>> If you have one good pin then this is nasty but works for me: set the
>> slide to somewhere close. Turn your stock down at that setting then lay
>> (or clamp) pin alongside. If correctly set then DTI on saddle should give
>> zero change along taper length. Adjust until it does.
>>
>> hth
>> --
>> Roland Craven
>> Nr. Exeter, Devon, UK
>> roland@petternut.co.uk
>> www.petternut.co.uk
>>
Surely you were right the first time, the DTI would only read zero movement
if the turned taper is exactly the same as the pattern taper when
laid/clamped beside each other, in a reverse taper manner. If the turned
taper was out, the DTI would show an error when the pattern was clamped to
it.
Bob
>
>
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> I need to turn a few replacement taper pins, 1 in 20 taper by about
> 3mm (thick end) and 20mm long.
> Easy enough to turn with the compound slide set over.
> The problem is I haven't a clue how to set the angle accurately enough
> - I just cannot set it to two decimal places of accuracy!
> I haven't got a sine bar (and doubt if I would know how to use it
> anyway!)
> Thought I could turn a larger diameter piece (having calculated the
> small and large diameters at a fixed length) but can forsee problems
> accuratley measuring the 'small' end becouse of the taper.
>
> Don't know if I'm missing the obvious - anyone got any pointers
> please? Its only a one-off job so don't really want to have to spend
> too much time. I only want a couple & assume I'd have to buy a 100 or
> something readmade ones?
> Many thanks for any replies
> regards
> Mike