Thread: Pulley keyway trick.

Nice trick Bob and one I will copy.

Do you reckon it would be useful having a small shoulder on your eccentic bush ? Save needing to position the bush in the press so that it wasn't pushed out while broaching.

BT

Originally Posted by Anorak Bob

Do you reckon it would be useful having a small shoulder on your eccentic bush ? Save needing to position the bush in the press so that it wasn't pushed out while broaching.

BT

Yup that would help...Bob

Why not just make a Bush to suit.

Peter,

That's exactly what I have done so far. Not one of of my broaching tasks has utilized a standard bore. Bob's idea avoids using the mill. Just a bit of simple four jaw work.

Bob.

that looks great a lot better than my way a bush a drill and a file.
not shore where a broach set is on the wish list

Originally Posted by azzrock

that looks great a lot better than my way a bush a drill and a file.
not shore where a broach set is on the wish list

It's on my list when I have a spare $400 to spend on tooling that is rarely used.
For $400 you can buy a shaper and do any size keyway, internal or external. That is another good reason to give yourself and the missus to but one and save money.

Dave

Originally Posted by Dave J

It's on my list when I have a spare $400 to spend on tooling that is rarely used.
For $400 you can buy a shaper and do any size keyway, internal or external. That is another good reason to give yourself and the missus to but one and save money.

Dave

I bought a small Dumont 00 broach set on ebay because most of my work is smaller parts and i have a shaper for the bigger parts....Bob

Even though I have a slotter I'd like a small DuMont set too. But it'll have to be off ebay USA as they seem to go for crazy prices here.

GQ

Originally Posted by aametalmaster

I bought a small Dumont 00 broach set on ebay because most of my work is smaller parts and i have a shaper for the bigger parts....Bob

Don't take away his excuse to buy a shaper. LOL

Dave

I think I'd prefer the dead sure accuracy of a broach over my shaper or slotting head. Normally two passes of the broach and the jobs done. Obviously a lot more fooling around making a guide bush especially if it's a one off slot but I'll put up with it. I might be whistling another tune though if a slotting head had been included in the kit I scored with the 13.

I've picked up my broaches, all Dumonts, individually on US Ebay. I'm short one shim. Homemade shims, lovingly crafted from a gutter offcut, don't really work.
The largest broach I have is 3/16". The largest I reckon I could manage with my one ton arbor press is most probably only 1/4".

BT

Originally Posted by Anorak Bob

I'm short one shim.
BT

I can get single shims easy enough...Bob

Bob,
I can't.
Bob.

Originally Posted by Anorak Bob

Bob,
I can't.
Bob.

Just see which ones you need and give me a yell...Bob

Thanks for sharing your tips, tricks and projects Bob, they have been most interesting. And your offer to help your fellow forum members to source hard to locate (for us) items will be very much appreciated, I'm sure.
As someone with a non machinist background, who is interested in starting as I rapidly approach retirement, can you tell me please, when using your offset bushing, is eyeballing the setup accurate enough, or do you have to use more sophisticated measuring to line everything up so that the key-way is accurately placed in the pulley. If so, do you just measure and locate the thinnest section of wall in your offset bush and line up on that when cutting your first cut through the wall of the bushing, or do you use some other method. I hope that this question is not too basic, but this is all a bit to the side of my area of expertise, Thanks,
Rob.