JackD48 Posted February 15, 2021 Share Posted February 15, 2021 I have an old Mashima 1620 round can motor which I'd like to use in a loco I'm about to start. I've usually used High Level gearboxes, but I've hit a problem: the boss round the output shaft of the motor is 6mm diameter, whereas the hole in the gearbox that it goes through is only about 5mm for High Level boxes. I could try opening out the hole, but I'm a bit reluctant to do so as I would probably screw up the precision fit of the parts. I know that Comet do gearboxes and I've got an old Branchlines one in my bits box, but I can't find any specs or diagrams of what is available. Wizard sell Comet gearboxes, but no pictures of them, let alone dimensioned drawings. I can't find anything about Branchlines boxes. Can anyone point me to anywhere where I can find specs for these other gearboxes. I'm looking for equivalents of the Roadrunner and/or Roadrunner+ boxes, but with a bigger hole. Thanks JackD48 Link to post Share on other sites More sharing options...
friscopete Posted February 15, 2021 Share Posted February 15, 2021 (edited) Pendants and engynneery types please look away . I worked out in my head, so not a great recommendation ,that if I soldered a motor mount like a piece of brass channel to the HL gearbox at 90 degrees to I could silicone mount the motor and mesh it perfectly .I always silicone mount on US brass when remotoring , some times making a mounting saddle as well from black Milliput and then siliconing on the motor .its a sloppy but great way of getting perfect mesh and still removable by pulling it apart .I didnt use the idea as I didnt need to . Edited February 15, 2021 by friscopete Link to post Share on other sites More sharing options...
bike2steam Posted February 15, 2021 Share Posted February 15, 2021 (edited) No problem opening the 5mm hole if you use a broach which will follow the centre-line unlike a drill that could go off-centre, and you can make the fit as snug as you want. Edited February 15, 2021 by bike2steam 1 3 Link to post Share on other sites More sharing options...
JackD48 Posted February 15, 2021 Author Share Posted February 15, 2021 The gearbox was all assembled and it was only when I came to screw the motor on that I discovered the problem - hence I'm reluctant to mess about with it. I've used an alternative motor so I'm not desperate for a solution. I'll have to order up a gearbox for the next project, hence asking about alternatives, but I expect that opening up the hole with a broach whilst still on the fret (just like opening up the bearing holes) would be much safer. Thanks JackD48 Link to post Share on other sites More sharing options...
RMweb Gold ianLMS Posted March 5, 2021 RMweb Gold Share Posted March 5, 2021 I have just fitted an old round Mashima motor to a Comet 2-stage gearbox. Everything lined up nicely. It was an old gearbox though so was possibly made around the same time the round motors were available. Link to post Share on other sites More sharing options...
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