Circloy Posted April 26, 2021 Share Posted April 26, 2021 I've recently purchased an 'O' gauge etched brass/whitemetal kit of this magnificent beast which when built will measure just over 2 foot (610 mm) in length. It will be built to run, which means two motorgearbox units. The problem is that whilst the chassis are identical the tanks above them are different and contain a LOT of open space making selection difficult. I have two identical units set aside which whilst I can fit them will require part of that open space to be invaded something I'm keen on avoiding. I'm wondering if by 3d printing bespoke designs, one for each end, if I can hide them. Motor & gear selection is no problem - I acquired a commercial quantity of surplus NOS. The basic design criterea is that the gears (helical) would run on steel shafts in brass bearings - so no rotating metal parts against resin to minimise both wear & friction, gears would run between two sides each 3 to 3.5 mm thick, 12 mm deep & around 20 mm long - similar to this: What I'm wondering is would a 3D printed (UV resin) gearbox be 'solid' enough not to flex when under load, stable dimensionally over time and resistant to (plastic friendly) lubricants. Link to comment Share on other sites More sharing options...
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