Bench Motor Arbor

[Chewy]

Just bought a Dayton 1725 RPM motor to make a bench motor. Did all the research and located all the parts except one. The JT3 arbor that sticks out from the shaft. You have the motor with a large diameter handwheel/flywheel. Out of the front of this is a small stub shaft with a JT3 taper to hold a real precision Jacobs 1/2" key chuck. The chuck is $277. You use the handwheel to slow the spinning or hold the shaft while tightening.

Here is the question. The shaft appears to be 1/2". The handwheel looks to be about 2-1/2" diameter and about 1-1/2" thick. Is there any reason that I can't make the stub shaft and handwheel all one piece out of 6061? The other option is to make the adapter shaft out of 1018 or 1144 as a separate arbor. Then make a press fit aluminum handwheel and slide over the arbor.

Any other options?

 

[rwdenney]

Ferree’s Tools sells their N99 bench motor in this configuration, but I haven’t studied one up close.



I don’t think I’d trust an aluminum arbor, or a chuck with only a taper holding it in place, for that matter. I use my bench motor for buffing and sometimes really lean on it—tapers are designed for axial not lateral forces and when I’ve done this in a drill press I’ve popped the taper loose on occasion.

I would make a close-fitting arbor with a recessed set screw, and press the handwheel on the outside of that.

This will be an early project on the big lathe.

Until then, I’m just using a bolt-on tapered buff arbor. Motor is clamped until I’m sure where it’s going to go. It’s a bigger motor than Ferree’s uses—1 HP with a 5/8” shaft. I’m also going to build a shield to keep the motor from inhaling buffer schmutz.

Rick “it needs that hand wheel and chuck” Denney

 

[Chewy]

That is the one I modeled. however there was another supplier that had more information. I came up with the Jacobs Chuck number and found in in some machinist suppliers. Can't find the other supplier right now, but it was definatly a precision Jacobs chuck with JT3 taper. Part # 63-003-003. Can't find where I got it. I didn't right down the supplier.

 

[Chewy]

I can't find where I got the information, just the part number. McMaster Carr has a chuck with 1/2-20 screw thread that would work. She will be using very small buffs for touch up buffing. I have a big Baldor that she uses for general key buffing. That is in the work shop. She is working in a spare room in the house. The McMaster chuck is 1/2 the price.

 

[matthewsx]

McMaster usually doesn’t disappoint.

Post some pictures of the work to be done….

john