I wish we could find a better solution than grub screws for attaching pulleys to shafts in 3D printing. Small-scale requirements make it difficult to use other industrial systems.
Grub screws often loosen under the effect of vibration even with Loctite. They also introduce eccentricity. And the tip of the grub screws marks the shaft, making it difficult to remove the pulley.
Any idea how we could improve this?
#3dprinting #3dptech #3dprinting_tech #pulley #motion #belt #grub_screw @3dprinting
@bear_lab @[email protected] If you're cool with mating the pulley to the shaft forever, there are adhesives like Loctite 638 that are designed to bond them together.
I've also found that there are big differences in how the various threadlockers work. Some are *much* better than others for this application.
Finally, I've never seen a grub screw work long term in a driven application without a flat (or better yet, a slot) on the mating shaft.
@PKL @3dprinting Agree for the flat but in general those pulleys have two grub screw so one will be on the flat and another one on the rounded side.
I am not ready yet for a definitive assembly for reparability purpose but clearly a cheap option. Might still need to be careful with the shaft tolerance that could vary from manufacturers and so introduce eccentricity. Would be low but still.
Greg Saunier
Phil Lam