[modeleng] Re: Driver quartering
- From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Mon, 9 Aug 2004 14:42:14 +0100 (BST)
Hi there Harry,
Not sure quite what you're getting at with the crankpin adjustment.
Surely a straight 6 degree taper on the crankpin and the hole its going
into is jut s a means of securing it.
If however you mean that you will maching a 6degree taper on the crankpin,
and make this taper parallel but offset axially from the crankpin itself,
so that rotating the pin will give you a means of adjustment then isn't
this fraught with other problems - such as as you rotate the pin to adjust
it, you will alter the quartering of the crank pin, and its throw from the
wheel centre, both at the same time. You would only ever want to be
adjusting one at once.
What do you think? Have I understood what you meant correctly, or am I a
miles off?
Yours,
Rich.
On Mon, 9 Aug 2004, Harry Wade wrote:
> 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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