diesel-xj
Aluminum
- Joined
- Sep 27, 2011
- Location
- South Texas
Good evening. I have a newb question. I am trying to make a pulley probably the hardest way possible. I had 2 pieces of rounded plate with lips on one side and small collars on the other, both center drilled to the same size already. I put a mandrel through the two plates and plug welded them together to make a thicker piece of stock for my pulley.
Next I chucked it up in the lathe and put a live center in it and began to work it down to size. I pulled it out of the machine to do something else and came back to it a few days later. I chucked it up the same as before, and went to cut one of the lips off the OD. It did not run very true, but the lip came off as a ring as planned. But it is not running true . I put a dial indicator on it and it was a little less than .010 out of round. I removed it and re chucked it and now it is much worse, about .030 out, and the live center is dancing around quite a bit.
This is where I have stopped. I looked at the surface I am chucking on and it is chewed up a bit from I guess over-tightening the chuck. I will try and put up some pics. I know it is ugly, but this is a learning project for me.
My question is what would be the best easiest way to get this back running true.
The end product is going to have a ID of a little under an inch, which I was planning to set on the shaft with 2 set screws, or make a much bigger project out of this and try and cut the splines to fit the driver shaft. This is supposed to be an extra pulley on a small diesel engine crankshaft so I can run airconditioning.
my chuck will not be able to get small enough to grab the ID. the OD of the little collar/lip is where the problem is, so I don't think I can chuck up there again.
Should I try a tapered mandrel?
The plan was to cut the center a little deeper than needed, and then cut the pulley walls, then weld a bead in the center of the pulley for extra strength to hold the halves together, then cut the center weld back down to finished size.
I did look for a store bought pulley, and I could not find anything that would not need almost as much work as making it from scratch.
any help is appreciated
thanks
Next I chucked it up in the lathe and put a live center in it and began to work it down to size. I pulled it out of the machine to do something else and came back to it a few days later. I chucked it up the same as before, and went to cut one of the lips off the OD. It did not run very true, but the lip came off as a ring as planned. But it is not running true . I put a dial indicator on it and it was a little less than .010 out of round. I removed it and re chucked it and now it is much worse, about .030 out, and the live center is dancing around quite a bit.
This is where I have stopped. I looked at the surface I am chucking on and it is chewed up a bit from I guess over-tightening the chuck. I will try and put up some pics. I know it is ugly, but this is a learning project for me.
My question is what would be the best easiest way to get this back running true.
The end product is going to have a ID of a little under an inch, which I was planning to set on the shaft with 2 set screws, or make a much bigger project out of this and try and cut the splines to fit the driver shaft. This is supposed to be an extra pulley on a small diesel engine crankshaft so I can run airconditioning.
my chuck will not be able to get small enough to grab the ID. the OD of the little collar/lip is where the problem is, so I don't think I can chuck up there again.
Should I try a tapered mandrel?
The plan was to cut the center a little deeper than needed, and then cut the pulley walls, then weld a bead in the center of the pulley for extra strength to hold the halves together, then cut the center weld back down to finished size.
I did look for a store bought pulley, and I could not find anything that would not need almost as much work as making it from scratch.
any help is appreciated
thanks