rope runner Posted February 7, 2012 Share Posted February 7, 2012 Hi All, Can anybody point me in the direction of somewhere I can get some 1mm metal (brass, steel, bronze) tube, with a 0.8mm orifice? It's to insert into a worm gear to allow it to fit onto a thinner shaft without any wobble. Any help appreciated! Paul A. Link to post Share on other sites More sharing options...
10800 Posted February 7, 2012 Share Posted February 7, 2012 Finney & Smith? http://finneyandsmith.co.uk/finneyandsmith/Brass.htm Link to post Share on other sites More sharing options...
DonB Posted February 7, 2012 Share Posted February 7, 2012 Might be as easy to look for a new worm gear with correct hole dia.?? Link to post Share on other sites More sharing options...
rope runner Posted February 7, 2012 Author Share Posted February 7, 2012 Finney & Smith? http://finneyandsmit...smith/Brass.htm Many thanks! they have just the right size in stock, and some L profile brass i'd been looking for too Link to post Share on other sites More sharing options...
billbedford Posted February 7, 2012 Share Posted February 7, 2012 It's to insert into a worm gear to allow it to fit onto a thinner shaft without any wobble. Be careful. Small motors with 0.8mm shafts, e.g. pagers or Nigel Lawton's, are not going to have the bearings to cope with driving through a worm. Link to post Share on other sites More sharing options...
rope runner Posted February 7, 2012 Author Share Posted February 7, 2012 Be careful. Small motors with 0.8mm shafts, e.g. pagers or Nigel Lawton's, are not going to have the bearings to cope with driving through a worm. It's only for an small N shunter, pushing one or two wagons arround. I understand that not fitting a worm directly to the motor is the advice for many medium-large 2mm locomotives using small motors such as this. But as mentioned in another thread, there are plenty of examples running faultlessly on the exhibition circuit to suggest that this is not the case if care is taken. Paul A. Link to post Share on other sites More sharing options...
goodmayes Posted February 8, 2012 Share Posted February 8, 2012 It's only for an small N shunter, pushing one or two wagons arround. I understand that not fitting a worm directly to the motor is the advice for many medium-large 2mm locomotives using small motors such as this. But as mentioned in another thread, there are plenty of examples running faultlessly on the exhibition circuit to suggest that this is not the case if care is taken. Paul A. Any data on how long "faultlessly" lasts?. I've taken a few of those motors apart to see what's inside and just the copper wire "whisker" brushes frighten me. Ted Link to post Share on other sites More sharing options...
hollywoodfoundry Posted February 8, 2012 Share Posted February 8, 2012 Be careful. Small motors with 0.8mm shafts, e.g. pagers or Nigel Lawton's, are not going to have the bearings to cope with driving through a worm. Quite correct Bill, in fact they do not have any sort of bearing that can take end thrust at all. Link to post Share on other sites More sharing options...
rope runner Posted February 10, 2012 Author Share Posted February 10, 2012 Any data on how long "faultlessly" lasts?. I've taken a few of those motors apart to see what's inside and just the copper wire "whisker" brushes frighten me. Ted Thanks for the input, but there's no need to be so sceptical. Just look arround on the 2mmFS website, or indeed I believe there are a few examples on here . Paul A. Link to post Share on other sites More sharing options...
richbrummitt Posted February 10, 2012 Share Posted February 10, 2012 Quite correct Bill, in fact they do not have any sort of bearing that can take end thrust at all. This seems to be the case with any small round motors. You can near remove the end loads with a good positive location for the worm within the frames/gear housing assembly to reduce end movement to a minimum. At least the Nigel Lawton ones are cheap enough to replace if/when they wear out. Link to post Share on other sites More sharing options...
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