[modeleng] Re: Driver quartering
- From: Harry Wade <hww@xxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 10 Aug 2004 11:02:45 -0500
At 08:26 AM 8/10/04 +0100, you wrote:
>As for the crankpins, although your proposed method is certainly unusual, I
>seem to recollect seeing it suggested before, Might have been by Martin
>Evans
Alan,
I'm sorry if I implied that I had originated the idea . . . . I did
not, I read it somewhere, which I cannot recall now, many misty moons ago.
I only said I had not seen it used before, which I have not.
>As for the actual manufacture of the matching tapers, I am sure that you
>have already decided how you want to do it.
I had planned to do almost exactly as you describe. The one
difference is that I would bore the tapers first (on a faceplate mounted
offset jig, with compound set at the required angle) and without disturbing
the compound setting turn the pins. I would bore the holes for the
straight crankpins using the same jig thus insuring that all crankpin
throws are identical.
I would prefer to do pin boring in the mill but there is no
realistic away to bore tapers on a vertical mill and I don't trust reaming
or d-bitting to produce a dead square and concentric hole. They may
indeed, but I don't have a very high level of trust in that method for this
particular job.
Regards,
Harry
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