[modeleng] Re: Someone has to do it . . . . .
- From: Harry Wade <hww@xxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 26 Mar 2005 08:35:25 -0600
At 07:56 AM 3/26/05 -0000, you wrote:
>Do you have details of the Model Engineer article, I'd like to see a copy.
>Regards, IP
IP,
No, and I have no idea when or where it was now, but I can narrow the
search somewhat. It was in an issue between 1964 and 1994. :-) I recall
that it was a "hints & tips" entry rather than part of a loco construction
article, and that it was by an unknown (at least to me) contributor.
But even so it's rather intuitive, and could be worked out for any
given whee/crankpin combination. My crankpins will have a journal diameter
of .500" which will result in a minor diameter on-taper of around .425",
easily enough for a stout drawbolt, but also for threading and nutting the
stub end if I choose, which was the way it was shown the original article.
I chose 6 degrees because it approximates the Morse tapers which were
originally designed to balance maximized resistance to torque when engaged
against ease of release.
I will bore my crankpin holes, as opposed to drilling and reaming,
(and turn the crankpin tapers at the same setting) in order to get them
dead square to the wheel and on-center. The trickiest part of the job will
be to insure that the crankpins reside at the right depth, leaving the
correct amount of crankpin "showing." Still, even if it's missed by a
hair, there are a couple of ways to adjust or correct this after the fact.
Eventually I will post photos of the results on my webhosting site.
Regards,
Harry
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