The Great Planes Pinion Gear Puller features high-strength, steel construction and fits 2-5mm shaft motors.
Pinion Gear Puller
One 2mm Base
One 5mm Base
One 1.5-2mm Shaft
One 3-4mm Shaft
See mfg website
Most Helpful Customer Reviews
This is a good little gear puller. I do a bit of robotics and bought a BaneBots motor and gearhead. I presses the pinion motor onto the shaft too far and had to pull it out in order to line it up with the gearhead. You can't just wedge a screwdriver in and pry, because you would screw all the bearings. So, I bought this little tool.
I give four stars because I think the press pins could be stronger steel, or a more stout geometry. I picked the middle-sized pin and it started to bend on me after a couple twists. I was able to go up one pin size and get the gear to pull without issue. I'll be able to tweak the smaller pin back to straight. With a lot of this type of thing, you end up making your own pins & plates anyway. Wither a plate doesn't have enough clearance or a pin is too long to fit into a area between gears, etc.
It's a nice, simple puller that seems flexible for different situations.
Comes with 4 pin/driver sizes, but only two base plates, and while the 3rd-largest pin fit my motor shaft perfectly, my gear just BARELY worked with the larger of the two plates - it really wanted to slip off the edge and make the whole rig crooked. A channel size in between the two provided baseplates would have been perfect and made everything a bit easier. It's also pretty fiddly trying to get the plates leveled/perfectly parallel with each other with the 3 machine screws. If the plates aren't parallel, the driver doesn't plunge down perfectly straight, which means it just slips off the shaft, and/or will get bent as you apply real pressure. You will need a very small allen/hex key to change the driver. The 3 adjustment screws (and associated lock nuts) I just adjusted by hand, which was fine, especially since you'll need to very, very carefully and minutely tweak them as you get everything lined up just so.
All those complaints aside... it worked great. I'm sure there...
I've been using this to remove press fit MXL pulleys from Nema 17 stepper motors with 5mm shafts and consequently have only used the large pin. It works incredibly well for that purpose. It is a bit fiddly to use while adjusting the bottom plate height to fit, but once everything is properly setup and aligned it works great. Mine arrived fully assembled as an oily mess in a few plastic bags, but none of the parts were rusty or seized so that's a plus to me.
I do wish that there was an easier way to grip the gear puller while turning the T handle. But it's a minor issue. Normally, I put a rag around the gear puller assembly so I can torque the T handle.
I also wish it were cheaper! But it has worked flawlessly with zero frustration right from the start, so its been money well spent.
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