O gauge worm & gear, delrin chain & sprockets

[rodent279]

I'm building an O gauge BR class 25, a Wagon & Carriage works white metal & etched brass kit. It's been a protracted build-8 years in, I've completed one bogie, and am half way through the second. Partly because I am busy with other things, like running, and keeping a classic car on the road, but mainly because I am lazy,

I need to get another gear and worm, and some delrin chain. I need a 25 tooth gear with a twin start worm. The gear that came with the kit is 15mm dia, 11mm wide, with a tooth ring that is 4.8mm wide, and an inner diameter of 3/16" (mixed units-sorry!). The worm is 8mm dia, with a 2mm shaft dia.

Can anyone suggest where to get one please? I've tried Ultrascale and Markits, nothing seems to match.

Cheers N

Edited June 26, 2021 by rodent279

[JeffP]

Have you approached PRMRP who currently market the kit?

[rodent279]

20 minutes ago, JeffP said:

Have you approached PRMRP who currently market the kit?

Haven't approached them, but they don't list anything similar on their website.

[M51625]

try Roxey Mouldings, they have a selection of twin start worm gears

 

Do you know the manufacturer of the one you have?

[markjj]

Slaters sell Delrin chain now it's in the motor and gears section at the bottom of the page 

[JeffP]

23 hours ago, rodent279 said:

Haven't approached them, but they don't list anything similar on their website.

But may know a supplier, since they still sell the kits?

I'd telephone.

[rodent279]

On 04/11/2020 at 10:31, JeffP said:

Have you approached PRMRP who currently market the kit?

 

On 04/11/2020 at 10:52, rodent279 said:

Haven't approached them, but they don't list anything similar on their website.

 

Ah, I think I may be wrong. PMRP list a 12.5:1 ratio worm & gear. The one I have in the kit (which dates from Wagon & Carriage Works days) is a twin start worm, with a 25 tooth gear-does that make it a 12.5:1 ratio?

[doilum]

The easiest solution might be two new matched gear sets. Your existing set can go into the spares box or return some funds via the bay of E.

[rodent279]

16 minutes ago, doilum said:

The easiest solution might be two new matched gear sets. Your existing set can go into the spares box or return some funds via the bay of E.

I could, but the problem with that is that I would then have to de-solder the whitemetal frames from the brass bogie chassis. I'd like to avoid this, as a) it's already been on and off a couple of times, and b) my whitemetal soldering is ham-fisted at best, and I've already managed to damage two of the bogie sideframes.

[doilum]

Fair point. I didn't realise that the white metal frames were structural.

[RobjUK]

PRMRP list both delrin chain kits and their standard ratio gears under the "Motors, gears and delrin" category:

 

http://www.prmrp.com/motors-gears-and-delrin.html

 

 

[rodent279]

Thanks all for the contributions. An email to PMRP, and subsequent phone call, has cleared things up. The worm I have is a twin start worm, and the wheel has 25 teeth, so it is in fact a 12.5:1 ratio. I have now bought some new Delrin chain, sprockets, a worm, wheel and motor, and 2 new bogie side frames to replace the ones butchered by my ropey white metal/low melting point soldering "technique". I'm good to go now, hopefully I'll have the kit finished in time for the 20th anniversary of its purchase next year!