Removing Bondtech Gears  

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.

RE: Removing Bondtech Gears

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

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

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.