Ynot Posted December 12, 2013 Share Posted December 12, 2013 OK, this is one of those 'What the hell is it called' questions. Simple requirements, but can't as yet find the bits I'm looking for. Item #1 - I need a small (around 1.5 to 2 inch diam steel wheel with an 8mm I/D collar in the centre that I can slip onto the 8mm offset motor drive shank and then bolt onto a custom (3D printed) drive wheel.The custom wheel does have a 8mm hole in it but sadly the torque of the motor against a resistive load was too much and it's damaged it. Hence I need to add the metal collar option to give the whole thing more strength to drive the piece.For those old enough to recall the happy days of Meccano sets, they used to have many such wheels in their inventory, for doing very much what I'm aiming at, though sadly their shaft diameters were much less than 8mm. Item #2 - I then need a couple of what I'm calling collets or collars - simple tubes (material not crucial as long as it's rigid) with an I/D to fit over an M10 bolt and O/D a max of 12/13mm. Length of the collet max of about 1 to 1.5 inches. But can I find what I want? As is often the case, these things usually have a name that has as yet not occurred to me during my Googling and paging through paper catalogues... Link to comment Share on other sites More sharing options...
DrV Posted December 13, 2013 Share Posted December 13, 2013 OK, this is one of those 'What the hell is it called' questions. Simple requirements, but can't as yet find the bits I'm looking for. Item #1 - I need a small (around 1.5 to 2 inch diam steel wheel with an 8mm I/D collar in the centre that I can slip onto the 8mm offset motor drive shank and then bolt onto a custom (3D printed) drive wheel.The custom wheel does have a 8mm hole in it but sadly the torque of the motor against a resistive load was too much and it's damaged it. Hence I need to add the metal collar option to give the whole thing more strength to drive the piece.For those old enough to recall the happy days of Meccano sets, they used to have many such wheels in their inventory, for doing very much what I'm aiming at, though sadly their shaft diameters were much less than 8mm. Item #2 - I then need a couple of what I'm calling collets or collars - simple tubes (material not crucial as long as it's rigid) with an I/D to fit over an M10 bolt and O/D a max of 12/13mm. Length of the collet max of about 1 to 1.5 inches. But can I find what I want? As is often the case, these things usually have a name that has as yet not occurred to me during my Googling and paging through paper catalogues... You might google "microbore pipe" for the tubes if copper or pvc is strong enough. A plumbing fitting such as a tank connector might serve as the flange/collar you want tooDave Link to comment Share on other sites More sharing options...
Ynot Posted December 13, 2013 Author Share Posted December 13, 2013 Yeah - I'd considered using offcuts of piping but haven't as yet found any of quite the right size to fit the M10 set screw/bolt - wa have all sorts of bits around the theatre, but nothing suitable as yet. Plumbing fittings aren't going to hack it for the flange/collar bit though - there's the chance of there being quite a lot of torque stress if anything gets stuck, or over-resistive to movement (possible for a mobile set piece) and the last thing I need is for it to strip another part with the drive shaft. Link to comment Share on other sites More sharing options...
musht Posted December 13, 2013 Share Posted December 13, 2013 Rapid have a few gears and pulleys, plastics seem to be in the 2- 4 mm bore range though, 8mm collars http://www.rapidonline.com/Education/Aluminium-Clamping-Ring-8mm-Pk2-50-8165 8mm implies reasonable amont of torque available from motor,, mebbe metal gearing http://www.technobotsonline.com/index.php?dispatch=categories.view&category_id=189 tube that fits spec , very thin wall http://www.technobotsonline.com/brass-tube-11.1-dia-x-305mm-long.html Link to comment Share on other sites More sharing options...
bigclive Posted December 13, 2013 Share Posted December 13, 2013 Bush? Pulley? ebay 8mm reprap pulley Link to comment Share on other sites More sharing options...
Ynot Posted December 13, 2013 Author Share Posted December 13, 2013 Bush? Pulley? ebay 8mm reprap pulleyNot quite.The bush/collar with grub screw is OK, but instead of the toothed wheel I need it to be flat and thin (maybe 2 or 3mm) and about 2 inches diameter with holes so I can bolt it to the plastic drive wheel. Link to comment Share on other sites More sharing options...
J Pearce Posted December 13, 2013 Share Posted December 13, 2013 There should be plenty of engineering places between you and brum who could turn something like that for you.The specifics of what you need probably means you'll struggle to find it on the shelf. Link to comment Share on other sites More sharing options...
dbuckley Posted December 13, 2013 Share Posted December 13, 2013 My thoughts too. The collet is trivial to knock up on a lathe, and a box of beer may be all it takes. The first item a bit harder, but a flat square plate with four holes in the corners mig welded to a shaft would be fairly easy to do by the aforementioned beer-induced metal basher. Link to comment Share on other sites More sharing options...
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