What Size Lathe To Grab 8.125" Plate?

south <Minneapolis Mn> glad to help, can swing 14 inches send PM
 
aametalmaster said:
Here is a 9" + dia plate turned on an arbor with my 10" lathe...Bob
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Wow if I had a good way to get a center that might be an option. Sparks are flying truing up the 7 5/8 pieces that I have. Interrupted cut and the scale from the plasma. I only built in .125 extra on my cuts.
 
chevydyl said:
I can grab about 9inches or more with my 8inch 3jaw on my 12" atlas, turn the jaws to grip OD, hell I even grabbed 8 inches with my 6inch 4jaw, kinda sketchy but it held
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I tried with my 6" 4 jaw and I could not even get one thread engagement all the way around.
 
I,ve used my mill on plates as long as it had a center hole that i could chuck up...put the cutter in the vise ;-)
 
Well my 6inch must have a little more stroke than yours....lol
At least that's what she told me
 
I turned a piece of torch cut plate on my 9" SBL many years ago. It was around 8-1/2" OD soild! Had to take a side grinder to the OD of the plate to tame down the torch cut a little. It was slow cutting using the back gears.
The way I held the plate in the chuck was. I drilled and tapped four 3/8" holes at 90 deg apart on about a 6" bolt circle. I installed some short socket head cap screws and tighten so the heads were sticking out on the face of the plate. Next, I turned the jaws around on the 4-jaw chuck and clamped on the heads of the cap screws. Lined it up and started cutting. When I finished one side, flipped the socket head screws from one side to the other side. Continued machining. Worked out like a charm!
 
I have held parts like that by drilling and tapping a 1/2 13 hole thru part then using a 1/2 13 piece of allthread thru part with a washer and nut at both ends of spindle . Also have bored a bore on part and held part with an id collet.
jimsehr
 
I guess I failed to mention that the plate has a ruff bore already (plasma cut) and it needs to be finished out to 2".
 
Bore it on the mill to 2 inches then hold it on a id collet.
jimsehr
 
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