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Mendel Pulleys

nophead
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Published on March 28, 2010

Description

Mendel pulleys that use an M3 grub screw and a captive nut. The advantage over the original is that you only need one small flat on the motor shaft, rather than two full length ones that have to be filed to exactly the right size.

Can be used for all three axes.

Instructions

Ream the holes out to 5mm and 3.5mm, fit the nut and grub screw. File a small flat on the motor shaft where the screw will engage.

I find it best to print three at the same time because it stops the small section getting too hot. If you have a machine that oozes then it may be best to print one at time to avoid strings.
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syncra on November 22, 2010 said:

Looks a fantastic alternative to the horrible filing job that I am avoiding from days....

I tried to fit a M3 nut in the hole but it does not fit - shall I use something smaller or just force the nut?

Thanks

nophead on November 22, 2010 said:

M3 nuts fit when I print them, but they are deliberately a tight fit. Maybe your printer setting are making the holes smaller.

If it ABS you can open them up by scraping with a sharp penknife. You can also heat the nut to above the melting point of the plastic and force it in.

bowdidge on May 29, 2010 said:

Worked great, and much easier to use than filing the motor shafts down! I drilled the central holes out so they were a press-fit on the stepper motor shafts, and didn't find it necessary to use a set screw.

casainho on April 3, 2010 said:

NopHead, thanks for sharing! -- and that seems a good improvement to original ones from Mendel. I added a link to this ones as an alternative:

http://objects.reprap.org/wiki...

lyndondr on March 29, 2010 said:

What size nozzle did you use and what were some of the other parameters for this print?

nophead on March 29, 2010 said:

0.4mm nozzle extruding 0.375mm filament at 16 mm/s for the outlines and 32 mm/s for the infill. Layer height 0.3mm. ABS at 220C, bed at 120C for the first layer, 100C after that.

rplumley on March 28, 2010 said:

I concur with printing multiple small parts at the same time to avoid mushing a hot layer. I believe the new makerbot extruder firmwares have "de-ooze" built in.

jeremyl on March 28, 2010 said:

Thank you! This is better then what I was planning to do with mine (drilling out the inside and drilling a small hole for a set screw/grub screw) - the addition of the nut makes perfect sense!

What length screw should be used?

nophead on March 28, 2010 said:

Yes I tried tapping ABS and putting a grub screw into it bit it failed very quickly. I think tapping PLA would work better.

The grub screws I used are 6mm M3.

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License

Creative Commons - GNU GPL
Mendel Pulleys by nophead is licensed under the Creative Commons - GNU GPL license.

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