I ended up going with all woodruff keys and keyseats. Used specs from the Machinery Handbook. The proper cutter yielded a slight press fit of the key into the keyseat. It stays in place well. The key ways were broached to a depth that doesn't allow much clearance at the top of the key. It is not going to rock up much more than a few thou. Has already been together and apart a few times with no issues.
Here is a peek at the madness showing the bare axle and two of the 3 Woodruff key seats.
Bob D.
Keyways
Re: Keyways
3/4" Juliet II 0-4-0
3/4" Purinton Mogul "Pogo"
3/4" Hall Class 10 wheeler
3/4" Evans Caribou/Buffalo 2-8-0
3/4" Sweet Violet 0-4-0
3/4" Hunslet 4-6-0
3/4" Kozo A3. Delayed construction project
1 1/2" A5 Camelback 0-4-0
3/4" Purinton Mogul "Pogo"
3/4" Hall Class 10 wheeler
3/4" Evans Caribou/Buffalo 2-8-0
3/4" Sweet Violet 0-4-0
3/4" Hunslet 4-6-0
3/4" Kozo A3. Delayed construction project
1 1/2" A5 Camelback 0-4-0
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Re: Keyways
When the time comes to cut the keyways in the bores, You will find that the bushings and broaches will conform to the NEMA standards. So you won't find a std. bushing that uses a B size broach, at a 1 3/16" bore. That needs a C size broach, and the smallest keyway is 3/16 with a C broach. You can make your own bushings to fit a B broach, but keep in mind that the length of the cut, is dependent on the size of the tooth gullet of each size size broach. A B broach is 1.5" length, a C broach is 2.5'
My wheels don't slow me down
Re: Keyways
I just made my own bushing to fit the broach I had. Was easy since I had a stub piece of the axle. Add shims behind the cutter until the proper depth is achieved. I went with the 3/16" as I had the tooling and met my load requirements. This is broaching the dual drive sprocket hub. The gnarly Spacely Sprocket at the bottom of the stack just lives on the press........
Bob D.
Bob D.
3/4" Juliet II 0-4-0
3/4" Purinton Mogul "Pogo"
3/4" Hall Class 10 wheeler
3/4" Evans Caribou/Buffalo 2-8-0
3/4" Sweet Violet 0-4-0
3/4" Hunslet 4-6-0
3/4" Kozo A3. Delayed construction project
1 1/2" A5 Camelback 0-4-0
3/4" Purinton Mogul "Pogo"
3/4" Hall Class 10 wheeler
3/4" Evans Caribou/Buffalo 2-8-0
3/4" Sweet Violet 0-4-0
3/4" Hunslet 4-6-0
3/4" Kozo A3. Delayed construction project
1 1/2" A5 Camelback 0-4-0
Re: Keyways
A properly fit woodruff key is set up so the set screw is offset from the center f the key radius. That way the set screw rotates the key in it's pocket so that the set screw and opposite end of the key clamp the hub in place with approximately twice the clamping force of the set screw alone. This makes for a more robust lock between the shaft and hub.