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Removing Bondtech Gears  

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Jason’s MMU
(@jasons-mmu)
Active Member
Removing Bondtech Gears

When assembling my extruder, I made a mistake and used loctite on the grub screw holding the Bondtech gear on the stepper motor.

The alignment to the hotend entry is slightly off and I’m thinking this may be part of the problem I’m having with MMU2 feeding.

The socket has rounded off a bit and I can’t get it out. Does anyone know a way to get the Bondtech gear off, ideally without damaging it or the stepper?

Thanks all

Jason 

Posted : 16/08/2022 12:39 pm
RandyM9
(@randym9)
Reputable Member
RE: Removing Bondtech Gears

I would say a screw extractor but finding one that small might be a challenge.

You can try drilling it out. If you use a bit just slightly larger than the Allen key you may be able to remove enough material to allow you to pry the rest out with a dental pick, tweezers, needle nose pliers, a magnifying glass, and a good deal of patience. 

Obviously, you’ll need to source a replacement Allen screw.

Good luck.

Posted : 17/08/2022 4:01 am
Neophyl
(@neophyl)
Famed Member
RE: Removing Bondtech Gears

I take it you heated it up to break the loctite bond before trying to remove it ?

Posted : 17/08/2022 6:30 am
Jason’s MMU
(@jasons-mmu)
Active Member
Topic starter answered:
RE: Removing Bondtech Gears

Thanks, I’ve had a look for small extraction sets in the past with no luck. 
I’m a bit reluctant to try heating in case I damage either the stepper or the hardness of the gear.

I might look around for a left handed drill fine enough to dig into the screw.

Thanks

J

Posted : 17/08/2022 6:19 pm
richnormand
(@richnormand)
Trusted Member
RE: Removing Bondtech Gears

I had success in the past with allen set screws:

1) Do not use a rounded ball-end  allen key, only one that is flat at the tip. If loose, a bit of aluminium foil in the hole to take any slack. Sometimes I would sacrifice an allen key one size up and grind its hex side surfaces to be extremely tight in the set screw and hammer it in place. That way it cannot slip.

2) use a soldering iron with a tip that fits the hole to heat the set screw and weaken the loctite.

3)Get some left hand drills to drill it out. Many times the drilling heat and torque will drive it out. In particular when the left over walls become thin.

Good luck with it. Hopefully you dont have to get medieval with it.

REPAIR, RENEW, REUSE, RECYCLE, REBUILD, REDUCE, RECOVER, REPURPOSE, RESTORE

Posted : 17/08/2022 6:57 pm
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