Gallery, Projects and General > How do I??

keyways.

(1/3) > >>

wheeltapper:
I am in the process of converting my mini mill to belt drive.

I've made the small pulley apart from the keyway.

the bore is 9mm dia by 25mm long , deep ,whatever,, the keyway needs to be 118 thou wide.

how the heck do I cut this without a keyway broach which I haven't got and can't afford.

I've also got the large pulley to do when I've made it.

answers on a postcard  :).

cheers

Roy.

Joules:
Setup a jig that will let you hacksaw slots parallel or drill, then use a fret saw to cut out the remains and file to size.  Otherwise have you anyone close by with a shaper.

John Rudd:
Roy,
I did exactly the same thing, convert my mini mill to belt drive.....
However I didnt key the pulley.....I left that as a weak point...so the pulley relies purely on the tightish fit on the shaft and the retaining screw in the end of the motor shaft....

Should anything go badly wrong, hopefully either the belt or pulley will slip.....

As for the bigger pulley, I jury rigged a boring bar in the  lathe with a tool steel cutter ground up to cut the keyway....then use the saddle back n forth increasing depth with each pass.....Worked for me... :dremel:

wheeltapper:
Thanks for the ideas guys.

John, would this work on the small one, remove the key and replace it with a shallower  aluminium one so the surface is level with the shaft, the use a pointed grub screw into the ali.

I was thinking about your idea for the big one, there's more room.

cheers
Roy.

Will_D:
I turn down the end of a grubscrew till its the width of the keyway, then drill and tap the pulley.

If has to be bitted in the Belt groove then make sure the overall length when tightened is correct i.e.  the head is just bellow the bottom of the belt.

Navigation

[0] Message Index

[#] Next page