Happy New Year, all.
A first project for my new-to-me tools - ATLAS 10 & Jet 6x26-
I have a little lathe experience, but no mill time, so I'm wondering about the use of the mill vs lathe.
I have this pulley off a Jacobsen lawn tractor that is egged out and needs re-bored and sleeved back to 3/4". I'm guessing I will have to remove 1/16 to 3/32" to clean it up. I'm looking for advice about doing this whole project, so feel free to chime in. I intend to bore it and make a steel sleeve to be pressed & loctited in. the sleeve will probably be split full length to accommodate the woodruff key, but there is also a large jack screw that holds the pulley on. The hole for that would be drilled through the sleeve and threaded after installing. There is a large dimple on the shaft where the jack screw tightens in to hold the pulley on. The transmission shaft this pulley fits on is in pretty good shape, but not perfect.
I believe the pulley is cast iron because of the chipped area in photo 642. First off, how can I tell for sure it is cast iron, and the type - Malleable, Gray, Ductile, Steel? I'm wondering about this because if it was steel, I could weld a sleeve in, but cast iron will have to be pressed in w/ loctite, and the keyway split all the way may be a problem.
As far as getting the boring done -should I clamp it in a 4 jaw, or clamp it on my mill table? It seems easier to me to center up in a 4-jaw because the outer edge of the pulley is machined, and I think I could center it fairly easily with a dial gauge. What is the rule of thumb for this decision? If I use the mill, (I don't have DRO) it seems easier to make a centering mistake for the bore location, but would be fairly easy to clamp down. I have some experience on the lathe, so that would feel more comfortable to me.
What about tooling? I have ground bits and boring bars for both the mill & lathe. Will cast iron wreck my cutter? I have a boring bar for the mill with a carbide cutter. Would that be best?
Appreciate any advice.
Banjo5
A first project for my new-to-me tools - ATLAS 10 & Jet 6x26-
I have a little lathe experience, but no mill time, so I'm wondering about the use of the mill vs lathe.
I have this pulley off a Jacobsen lawn tractor that is egged out and needs re-bored and sleeved back to 3/4". I'm guessing I will have to remove 1/16 to 3/32" to clean it up. I'm looking for advice about doing this whole project, so feel free to chime in. I intend to bore it and make a steel sleeve to be pressed & loctited in. the sleeve will probably be split full length to accommodate the woodruff key, but there is also a large jack screw that holds the pulley on. The hole for that would be drilled through the sleeve and threaded after installing. There is a large dimple on the shaft where the jack screw tightens in to hold the pulley on. The transmission shaft this pulley fits on is in pretty good shape, but not perfect.
I believe the pulley is cast iron because of the chipped area in photo 642. First off, how can I tell for sure it is cast iron, and the type - Malleable, Gray, Ductile, Steel? I'm wondering about this because if it was steel, I could weld a sleeve in, but cast iron will have to be pressed in w/ loctite, and the keyway split all the way may be a problem.
As far as getting the boring done -should I clamp it in a 4 jaw, or clamp it on my mill table? It seems easier to me to center up in a 4-jaw because the outer edge of the pulley is machined, and I think I could center it fairly easily with a dial gauge. What is the rule of thumb for this decision? If I use the mill, (I don't have DRO) it seems easier to make a centering mistake for the bore location, but would be fairly easy to clamp down. I have some experience on the lathe, so that would feel more comfortable to me.
What about tooling? I have ground bits and boring bars for both the mill & lathe. Will cast iron wreck my cutter? I have a boring bar for the mill with a carbide cutter. Would that be best?
Appreciate any advice.
Banjo5