Spring loaded bearing bracket for Reittec Polisher

Description

I had the same problem as many other people with Reittec's very good polisher design: the drum kept jumping out of the gears. The reason seems to be that the weight of the drum and content is not a high enough force to keep the gears conected. I came across Zefram_Cochrane's design of an additional bracket with some bearings on it. I liked the idea, but I wanted to change some things: - plastic rolls instead of metal bearings pushing on the glass - position closer to driven rear gears where the force is needed to keep the gears in contact - easy to replace one drum with another (as I have a seperate drum for each of the grain sizes) - automatically adapted force against the gears (spring loaded instead of completely fixed bracket in order to adjust for any unevennesses in the rotation) - additional roll on the backside to push against the drum in axial direction when the drum is tilted (this turned out to be not necessary, as in fact the two existing gears of Reittec's design do a pretty good job of preventing that the drum "slides down" towards the rear side - however I left it in the upload if you might need it) The result is the design that I uploaded here - my parts are those ones shown in red in the picture, everything else are parts from the original Reittec 170mm Polisher design which can be found here: https://www.thingiverse.com/thing:4076827 It should be rather self-explanatory how to build this, however here the most important things: - the Arm1, Arm2 and Arm_Bracket files need to be printed twice - no supports needed, except for the holder_adapter bracket for the rear side roll - the rolls I used are these ones: https://www.hornbach.de/shop/Transport-Geraete-Bockrolle-bis-30-kg-25-x-29-x-13-mm/6644789/artikel.html - you will need M3x20mm screws and nuts - for the connection between brackets and arms it is recommended to use self-locking nuts, as you do not want to tighten this connection as this would prevent rotation of the arms - the rolls are connected with M4 screws to the bracket arms (the corresponding nuts belong in the prepared pockets of the arms - I used square nuts, but hex nuts should work too) - The holes for connecting the brackets with Reittec's base housing need to be drilled with a 3mm drill - you will need a spring and a hook for pulling the arms towards each other and (in case that you also use the backside roll) 2 additional springs for pushing the rear roll. I also provide the STP files of my design if you want to make adjustments yourself, but I don't think that this is necessary because so far everything works as intended :) If you are interested, I made some additional upgrades for the polisher: - an interlocking holder to keep the ribs in place within the drum without bonding with glue: https://www.thingiverse.com/thing:4879541 - a housing for a switch and the power supply of the motor: https://www.thingiverse.com/thing:4879586 The large gear at the bottom of the drum that you see in the picture was designed by Juliencasimir83 and can be found here: https://www.thingiverse.com/thing:4230298

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