Filing/sanding down motor axle

[cyberdog]

Has anyone o ever tried to file down a motor axle ? I have a 5mm motor that i need to get down to 3.2mm.

If anyone of u has tried it lemme know what to think of ?

Pete

 

[HBRC]

there are 5mm pinions out there....rc4wd carries some, or you can check out heli sites for them too.

 

[Tanis]

If you have access to a lathe or drill press, it's no big deal, just go slow so as not to take too much off. I wouldn't recommend filing or sanding by hand, as it would get out of round and off center pretty easily, meaning you would end up with a bad gear mesh;-)

 

[cyberdog]

I was thinking of running the motor at slow throttle and then use file / sandpaper. That way it would stay round.

I have found some 5mm pinions but the ones i need ( 48p metric) seems hard to find at bigger sizes , 20-25.. I have found smaller ones like 15-16 but think they might be too small.

 

[AlGio]

I would be a lot easier to drill out the pinion gear with a 5mm bit than it would to grind down the motor shaft!

 

[ohmyCLOD!]

yeah

I would be a lot easier to drill out the pinion gear with a 5mm bit than it would to grind down the motor shaft!

This was going to be my advice... I tried this once and it worked fairly well once I got my little vice set up on the drill press. Much easier than filing the shaft down, which would weaken the shaft."thumbsup"

 

[cyberdog]

Yeah but when drilling up the hole dont u get really little room for the setscrew to hold the pinion in place ? Then i would need to find some pinions that has alot of material that can be bored out

 

[JohnRobHolmes]

How long is the motor body? Is the shaft removable? I may have some hardened 5mm shafts that are necked down to 3.2mm that fit your motor.

 

[cyberdog]

Its a 540 size motor. Cant see if the shaft comes loose from the rotor itself.

 

[JohnRobHolmes]

Inrunner or brushed? You are best off drilling pinions.

 

[cyberdog]

Its a brushless inrunner.

Yeah the best would be to drill pinions but need to find some that has enough material so the screw holds the pinion in place. Need 48pitch metric ones. Just read that 0.6mod are the same ones but waiting for confirmation on that.