Ideas needed on how to fix a gear to this shaft?

[Dranreb]

Hi Guys, I'm making a replacement for my carriage traverse gear case assembly, the original gears were held onto squares at each end of the shaft, not such a good idea as wear makes them loose.

I have eliminated the problem one end by making a one piece small gear and 1/2" shaft.



Next step is to make the larger gear and attach it, it has to be removable to fit the shaft in the case.







I'm now a bit stuck as to what fixing method to use, there is very little room between the shaft end and the apron so a nut isn't won't fit, although a countersunk screw may just be possible.

I'm hoping it shouldn't need taking apart again, in my lifetime anyhow :lmao: so I wondering about shrinking it on (oven and fridge method) with maybe a chemical fixing or screw in the end as backup.

Not high speed and not a lot of torque.

So I'd really like ideas, or even better how you have done a similar job that has worked well?

Thanks Bernard

 

[toag]

If it doesnt see alot of thrust, i'd say clean it to beat the band with isopropyl and glue it with a really good 2 part, super glue or loctite red.

- - - Updated - - -

or JB weld.. forgot about that stuff

 

[xalky]

Why not put a keyway on it. Since there's no hub on the gear, drill and tap a set screw hole at the bottom of one of the gear teeth. Loctite it for good measure.

Marcel

 

[davidh]

I heard guys drilling and tapping two holes 180 deg. apart, right on the separation line of the gear and the shaft and installing threaded part of bolt or even a setscrew, and cut off whatever remains stuck out beyond the end of the shaft. this would be similar to having two half round keyways in each side ? and of course red Loctite is awesome added to that during assembly. .
does that make sense ?

 

[RandyM]

Why not put a keyway on it. Since there's no hub on the gear, drill and tap a set screw hole at the bottom of one of the gear teeth. Loctite it for good measure.

Marcel

I like this idea! :thumbsup:

 

[DAN_IN_MN]

I like this idea! :thumbsup:

Me too!

 

[stevecmo]

If side thrust isn't a big issue, how about just putting a set collar on the inside and drill and tap the end of the shaft and put a keeper washer on it. Probably the easiest if there's room for the set collar. But.....the key is probably the best solution.

Steve

 

[Dranreb]

Thanks for all your suggestions guys, the one I'm leaning towards so far is davidh's screw key, pressing the gear on then drill and tap seems less fiddly work, the thread would hold the gear from sliding off the end, and I have just the right grub screw to hand..

Found this online just to be sure I've got it right



Bernard

 

[mzayd3]

A little late, but what about threading the shaft and gear opposite the direction of rotation?

 

[Dranreb]

A little late, but what about threading the shaft and gear opposite the direction of rotation?

I did think about threading, but it turns both ways which means a locknut and there's no room for one, thanks for you input...