Mamod spring belt profile

Mamod spring belt profile

This topic has 6 replies, 6 voices, and was last updated 7 April 2026 at 19:10 by paul rushmer.

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6 April 2026 at 21:59 #843488
paul rushmer
Participant
@paulrushmer83015
I want to use a mamod spring belt to drive a small generator, I do not know what profile to machine the pulleys. Any surgestions would be helpfull, I was thinking a 60 degree vee screw cutting tool would do?

Thanks Paul
Advert

6 April 2026 at 22:53 #843493
bernard towers
Participant
@bernardtowers37738
Its a half round groove of about 3/32′
7 April 2026 at 06:54 #843504
DC31k
Participant
@dc31k
If you studied some photos of Mamod items that use the same belt, you might be able to determine what they did.

Do you intend to draw power from the generator? Did Mamod use the belt in a way that it would encounter similar resistance?
7 April 2026 at 07:01 #843505
JasonB
Moderator
@jasonb
I have used 1/16wide x 1/16″ deep with a half round bottom, so a U shape not half round. This is also the size given on th eStuart Williamson which used the same type belt for the governor. The actual belts is approx 1.5mm wide so very little side clearance.

Depending on the size of your generatr and the load it creates you may have problems with belt slip. But as it drove the TE along there would be a reasonable resistance to that

Drives this cooling fan OK
7 April 2026 at 08:42 #843533
Bo’sun
Participant
@bosun58570
Good morning Paul. I suspect, as suggested, a U shaped/round bottomed groove would be best. A vee groove might tend to grab a round belt and sap some of the all important power.
7 April 2026 at 17:17 #843614
Michael Gilligan
Participant
@michaelgilligan61133
Just as an aside … I was interested to see reference to sharp scissors!

.

.

MichaelG.

.

Credit: https://www.berrybrooksteam.co.uk/blog/toy-steam-mamod-through-the-decades/
7 April 2026 at 19:10 #843633
paul rushmer
Participant
@paulrushmer83015
Thanks all

Tool sharpening tomorrow, the generator is a small brushless motor driving a few leds.

Paul
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