How To Hold It?

[RVJimD]

I am trying to figure out how to hold this in the lathe. What about putting a dowel pin in each jaw so the pins don't interfere with the spokes like the full jaw? I need to put a shallow groove in the outside for the O ring.

I have tried to use a stub of delrin but the wheel slips on the arbor. I guess I could make a 3/4" arbor and thread it?

But, has anyone done dowel pins in the jaws? I would need to turn it real fast, just getting the holes drilled in the jaws all in the same place might be tough.

Jim

 

[Cobra]

Could you make an expanding arbor for the centre?

 

[Billh50]

An expanding arbor would work. Another thing you could do is make an arbor with a backing large enough to put a pin toward the outside edge that would fit between the spokes and a cap to tighten the wheel. The pin would keep the wheel from slipping on the arbor.

 

[toag]

If you have a 5ccollet nose you could use an expanding 5c collet.

 

[RVJimD]

Expanding collet sounds good but I don't have a 5C. The pin idea sounds very good!

Jim

 

[toag]

I have some expanding arbors if you want to borrow one. If you don't have 2 piece jaws I'd hate to see you drill into your jaws

 

[RVJimD]

Ya, I did some more searching and instead of drilling the jaws it seems like making soft jaws would be better.. Although not a perfect solution for this operation.

 

[toag]

If you have 2 piece jaws. You can can machine the all to fit the top jaws., then turn it down to Id of the center. Then expand the jaws out to grab it.

 

[Ebel440]

Just make an expanding arbor put a piece of round metal in the lathe a little larger then the Id. Drill and tap and countersink the end for a socket head screw. Make a grove at the base of it to allow the mandrel to expand. Then take it out and cut a few slits lengthwise. Put it back in cut the od to match the part. Put a screw in and your done. Put the part on and put in screw and tighten.

 

[tomw]

I just did something similar with a flywheel I am working on. I made a two piece mandrel, as diagrammed below. The hole in the mandrel base is tapped, the hole in the retaining plate is a clearance hole. Hopefully the diagram is relatively clear.