RE: [7mmnga] Digest Number 678
Date: Mon, 09 Feb 2004 20:11:01 -0000
From: "adriangrayfr" <adrian@...>
Subject: Re: Garratt mechanism
--- In firstname.lastname@example.org, "Ian McIntyre" <ismac@o...> wrote:
> Replacing that beautiful Faulhauber motor, gear head and bevel drive
> with a Mashima and Romford gears - what a waste - why on earth would
> you want to do it?
> Because the bevel gears simply would not remain in mesh. No amount
> persuasion would keep them in mesh. With a mechanism trapped in the
> as this one is, I could not afford to have to rebuild it to repair
> replace the gears. I have replaced them at the outset with a metal
> gear, which should last quite a long time.
> ian McIntyre
Ah ha - I understand and sympathise.
Mr McP suggests using the 1mm wire supplied to locate the motor
After I shared my disappointing experience and the suggestion that it
should be 1.5mm wire to get a snug fit he acknowledged that the holes
have slightly over-etched and I had the solution.
I believe he has amended things for later batches.
The problem as i see it is more to do the bevel gears, crossbox and the
fitting thereof. When assembled, the crossbox was able to remove itself from
the end of the motor shaft. This coupled to the fact that we are talking
about trapped plastic parts, just did not seem reasonable.
I have ended up with a robust mechanism that should see out the model. It is
a little difficult to reach the motor mount screws but not impossible. I
also intend wiring the motors in series, with the pickups parrallelled. This
should result in a smooth even running locomotive. It means running 2 wires
the length of the model but they are easy to conceal.
I am still concerned about the fitting of the counterweights and their
quartering. I think I may have to fit the bushes to the axles, test fit and
mark the weight and bush before removing and fixing the bush. Tests with
super glue are proving to be a complete failure. What type of plastic are
the bushes made from? A set of brass bushes would be better. It would be
more tedious to get the quartering right, but it would then be easier to
By the way, has anyone else noted the incorrectly spelt Dulce name plate in
the Burrinjuck Krauss Kit? I must admit, that I had not until pointed out to
me by another modeller here in OZ
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