The Unofficial Mamod and Other Steam Forum

gavsr70 · Posted: Tue Jan 29, 2008 8:24 pm Post subject: MM1 Flywheel

Hello

Wondering if anyone has a spare MM1 flywheel? The one that came with my MM1 has come to an unfortunate end.....
I have a new, full sized flywheel (which I think is suitable for mobiles) for trade if you are interested or name your price

cheers
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Nick · Posted: Tue Jan 29, 2008 11:08 pm Post subject:

What was the unfortunate end?

gavsr70 · Posted: Wed Jan 30, 2008 1:32 am Post subject:

It came with an unusually large screw - the screw hole thread was broken & so I thought that I would fill with solder, drill and tap and replace the screw with the right one.
Whilst heating the wheel to melt the solder in the hole, the hub literally melted

Subsequent attempts to re-drill the hole and screw thread have failed miserably.
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johnreid · Posted: Wed Jan 30, 2008 1:42 am Post subject:

Solder is kind of soft to tap also, so in fact it might have worked out for the best in this instance. Hope you find the Flywheel.
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Nick · Posted: Wed Jan 30, 2008 2:16 am Post subject:

Well, that didn't work out too good then. I did the same thing with a pulley, so I understand.

gavsr70 · Posted: Wed Jan 30, 2008 12:26 pm Post subject:

I was surprised at how low the melting temp was - it seems to be some kind of alloy & not pure steel as I would have thought.
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CCairns · Posted: Wed Jan 30, 2008 2:33 pm Post subject:

It is made from Zinc Alloy / Diecast Mazak which has a lower melting point than some solders ( approx 380 - 405°C ).

I found this when trying to solder a broken tab on a piece of Mamod railway track, it just melted like the flywheel mentioned above, before my solder.
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gavsr70 · Posted: Wed Jan 30, 2008 9:59 pm Post subject:

When I've drilled and then tapped a new screw hole, invariably the thread in the hole breaks when I tightened the screw on the crankshaft (which was the original problem which started this whole thing). It certainly wasn't overtightened.
May have toi keep my eye out for a spare part MM1 on ebay.
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Nick · Posted: Thu Jan 31, 2008 5:35 am Post subject:

The one that melted easily for me was a pulley for a Weeden 43. Got a replacement though and fixed the other one.

John Richards · Posted: Mon Feb 25, 2008 12:30 pm Post subject: Flywheel

G/Day,
If you want to send me the "Specs" for it I`ll whack one up on
my Lathe, shock: However, It would have to be a Disk Type in Brass
as I`m too lazy to do Spokes!.cry:
You pay Postage.

regards,
John. : :
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gavsr70 · Posted: Mon Feb 25, 2008 12:44 pm Post subject:

John - thanks for the offer - I've managed to source a spare flywheel though.

I am however, looking at getting a small model makers lathe for this very thing though - so far I've seen the minitech range and the clisby lathe which is manufactured here in Adelaide.

Any suggestions on which is better or an alternative?

Cheers
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tmuir · Posted: Mon Feb 25, 2008 1:48 pm Post subject:

Have a look here
http://www.generaltools.com.au/

This is an Adelaide shop.
I am planning on buying the AL-50GB lathe in the next couple of weeks
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