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Brass [worm gear vs plastic]


CDRC

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I would change the other way! I have fixed a couple of locos with plastic worms on an X03 where the worm has moved slightly and affected the running of the motor. Also, the plastic cogs associated with them come loose on the driving axle or totally disintegrate. The brass ones might be a bit noisier but they last virtually forever

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Nearly everybody on this forum asks how to convert gears to brass, so perhaps if you could explain why you want to go against the normal flow, then appropriate alternative suggestions could be offered.

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The question was asked to clarify whether the exchange of brass for plastic had any redeeming qualities. I have just finished servicing a 1978 Hornby King Arthur class N15. The loco now runs well pulls away at low speed and for a 40+ year old motor one can’t complain. The only issue is it’s very noisy and clatters as it turns, especially at low revolutions. I was wondering that if I swapped out the brass worm for a plastic one might the noise reduce. Without being able to diagnose why the clattering I’m reduced to a process of elimination. I though to replace the magnet but my research suggests this option would not reduce the noise. I also wondered if the copper winding core was knocking against the motor housing somehow. I think I’ll have to remove the motor and bench test it.

thanks for all your replies and to Tony57, I thought that swapping out the worm wouldn’t be as simple as I hoped and to Chrissaf, I hope there are members who may possibly identify a ‘fix’

C

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There could be several reasons for the noise, motor bearings worn allowing as you say the armature to foul the frame, end slop in the armature which can be shimmed out, brushes fouling on the armature, torque from the worm gear forcing the axle gear sideways, etc.

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As said, the plastic Worm is different to the brass worm.

The plastic worm is a single start worm.

The brass worm is a twin start worm.

The gear wheels were, in theory, colour coded.

Brass, or black plastic gear wheels were the 40 tooth ones, for the X.04 motor with brass worm.

Silver grey plastic gear wheels were the 28 tooth ones, for the New Type X.03 motor with black plastic worm.

Other colour gear wheels have also been made.

Some Tri-ang / Hornby motor information can be found here…

https://www.rmweb.co.uk/community/index.php?/topic/166308-triang-x03-and-x04-motors-whats-the-difference/&do=findComment&comment=4536316

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