Belt gears - to flange or not to flange?

Belt gears - to flange or not to flange?

As described in http://repstrapdk.blogspot.de/2017/05/the-re-birth-of-z-probe-mount-and.html?m=1, my Mendel90 (sturdy) prints a lot better when under fairly high tension, right below where the belt jumps off. To avoid embarrassing belt jumping-off incidents, I've considered changing the gear on the X axis shaft to having a flange, stopping the belt. But nophead usually knows what he's doing, so - is there a reason the belt gears shouldn't have flanges?
http://repstrapdk.blogspot.de/2017/05/the-re-birth-of-z-probe-mount-and.html?m=1

Comments

  1. Ryan Carlyle18 June 2017 at 15:51

    Lars Clausen I think polyurethane T2.5 (metric trapezoid tooth profile). Was a really popular early RepRap option. Easier to model and print pulleys than modern curvilinear profiles with smaller teeth like 2mm GT2.

    ReplyDelete
  2. nop head19 June 2017 at 08:36

    Flanges prevent the belt slipping off but if the belt rubs against the flange anything more than lightly it can cause it to ride up and give positional errors.

    To make it run in the centre the motor shaft needs to be perfectly perpendicular. Sounds like you are pulling the motor out of line.

    Perhaps try loosening the screws and shifting the front to the right.

    ReplyDelete

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