64mm Magnetic Carriages

thingiverse

This is a remix of Hayden's 2020 carriage. I like his idea because makes the carriage very light and has the advantage of fine belt tensioning. The differences are: 64mm rod spacing to work with the 64mm 3xPiezo Magnetic Effector here https://www.thingiverse.com/thing:2361081 and 3mm holes for M3 bolts to work with Delrin V-Wheels from http://www.think3dprint3d.com and 20mm wide extrusions from Motedis Profile 20 I-Type slot 5 http://www.motedis.co.uk/shop/Slot-profiles/Profile-20-I-Type-slot-5:::999991_99999133.html or Misumi http://uk.misumi-ec.com/vona2/detail/110302684350/?HissuCode=HFS5-2040-%5B50-4000%2F0.5%5D&PNSearch=HFS5-2040-%5B50-4000%2F0.5%5D&KWSearch=HFS5-2040&Keyword=HFS5-2040&searchFlow=results2products&Keyword=HFS5-2040 They have the same wheel spacing so can also work with extrusions and 15mm diameter V-wheels from OpenBuilds or RobotDigg.com if you modify the hole size. I've attached CAD files for this. If you need other formats please let me know. Per carriage, you will need: 3x Delrin V-wheels from www.think3dprint3d.com 2x 10mm ball studs from Haydn http://www.MagBallArms.com 3x M3x30 bolts. 10x M5 nylock nuts 6x M3 washers 2x M3x35 hex bolts for the belt tightener. 2x M3 nuts for the belt tightener. 1x M3x40 hex bolt for preloading the carriage wheels. 1x M3x20 hex bolt for the vertical post for the lower G2 belt attachment. 1x M3x15 bolt for upper belt attachment 1x M2.5x12 hex for fine end stop tunning 9x M3x4mm spacers http://www.ebay.co.uk/itm/142378241665 The spacers are to be placed between the bearings in each wheel. That helps a lot with wheel alignment. Between every wheel and the carriage, there is one nylock nut and two washers. Is best to fit them first and measure all three with a caliper before you fit the wheels. This way you know all three wheels, when fitted, will be the same distance from the carriage. Nylock nuts can differ by as much as .4mm. My Kossel is built with Robogigg metal corners and I've twisted the belt to run over the idler pulleys. They run very smooth this way. Cable ties should not be necessary if part "b" and "c" are precisely printed. Some of Robodigg f623zz bearings started being noisy after 6h of use so I've replaced them with some EZO made in Japan. Enjoy!