[modeleng] Re: Driver quartering
- From: Peter Sheppard <peter.sheppard@xxxxxxxxxx>
- To: "'modeleng@xxxxxxxxxxxxx'" <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 9 Aug 2004 14:39:16 +0100
Hello Harry,
Most recently on 7.25" gauge I have used the keyways, however in a previous
life with some quite large 5" gauge I used to loctite the wheel to the axle
then drill a hole that was on the join between the axle and wheel
(effectively creating a keyway!) and loctite a round pin in there.
Regards
Peter
-----Original Message-----
From: Harry Wade [SMTP:hww@xxxxxxxx]
Sent: Monday, August 09, 2004 2:22 PM
To: modeleng@xxxxxxxxxxxxx
Subject: [modeleng] Driver quartering
What's the usual way of fixing and quartering drivers on large scale
jobs in the UK? The usual practice over here is to use keyways for
quartering and fixing drivers but I'd rather not use keys on this
locomotive. I'm considering either a press or Loctite, then drill and tap
the back of the hub for a threaded cross-pin.
Something else I plan to do, that I've not seen done before, is to
make the main crankpins adjustable by giving them tapered shanks in
matching bores. The locomotive (a Tich x 2) will have Walschearts valve
gear and I plan to square the ends of the main crankpins and broach the
return cranks to fit, thus some means of exactly locating the squared end
(and the return crank) must be found.
In plan to do this by boring the driven wheels a 6 degree taper
in the crankpin bore. The crankpins are then turned to a 6 degr taper on
their shanks and a tapped hole is added to the ends. The taper will allow
the crankpins to be adjusted and then pulled tight with the draw-nut/screw
on the back of the wheel, and, as Mr. Hardy says to Mr. Laurel "... no one
will be the wiser."
Regards,
Harry Wade
Nashville Tennessee
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