cobach47 Posted May 14, 2013 Share Posted May 14, 2013 I have a loco i built in the 70's but i need a worm to match the wormwheel which has 40 teeth and is about 14.5 mm diameter i assume that this is 40-1. The reason i can't fit a complete gear set is the loco has double frames and outside cranks and it would mean breaking the frames and unsoldering the cranks, it could turn into a complete rebuild, any help would be much appreciated.. Link to post Share on other sites More sharing options...
Gruffalo Posted May 14, 2013 Share Posted May 14, 2013 My spare 60:1 set would be no good as you couldn't install without splitting everything. If you want dimensions, I will supply them. Link to post Share on other sites More sharing options...
Jol Wilkinson Posted May 15, 2013 Share Posted May 15, 2013 These are probably Romford gears. Take a look at the Markits website http://www.markits.com/, where you can download the catalogue which has gear details and dimensions for Romford gears. Link to post Share on other sites More sharing options...
hayfield Posted May 15, 2013 Share Posted May 15, 2013 What make of loco ? Does the gear have a grub screw to hold it to the axle? A photo may help Link to post Share on other sites More sharing options...
cobach47 Posted May 16, 2013 Author Share Posted May 16, 2013 this is the loco i'm trying to find a worm for the gearwhell is about 14.5 mm diameter Link to post Share on other sites More sharing options...
billbedford Posted May 16, 2013 Share Posted May 16, 2013 Why do you need to replace the gear wheel? Are teeth of the gear broken? If not surely all you need to do is find a worm that has the same tooth spacing as your gear. This gear looks like a 64 DP, so any 64 DP will fit it. It will probably be best to check your wheel against a range of available worms, but 64 DP was a common standard at the time this loco was built. Link to post Share on other sites More sharing options...
Jol Wilkinson Posted May 16, 2013 Share Posted May 16, 2013 Going by that photo I would say it is a Romford gear. They kept the gear diameter the same, and altered the ratios by increasing/decreasing the number of teeth and their profile; as well as changing the worm to match. See my earlier post re Markits. Link to post Share on other sites More sharing options...
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