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Backplate for sm9 lathe

djberta

djberta

Ultra Member
Premium Member
I got an ER32 flat chuck off Amazon and I want to make a backplate for it. What I need to know is does anyone know what the spindle thread is on the standard modern 9 ultilathe? Do you guys think I can use aluminum or does it have to be medal? I do have a piece of cast iron that might work, old weirder plate weight. Or should I try to find some other cast iron to use?
The collet plate.
ER32 Collet Chuck 80mm Diameter for CNC Milling Machine Tools Carbon Steel Collet Chuck 7 Holes Chuck Lathe Collet Chuck Accuracy 0.005 ER32-D80 https://a.co/d/dAIqafL
 
Perhaps a commercial one can be adapted? 1-1/2 X 8 is pretty common, for example Little Machine Shop has 6 inch and 4 versions:

littlemachineshop.com

6" Chuck Adapter | Lathe Chuck Adapter Plate

Measuring 6 inches in diameter, this cast iron lathe chuck adapter plate fits lathes with 1-1/2"-8 spindle nose thread. Purchase for your workshop today.
littlemachineshop.com littlemachineshop.com

littlemachineshop.com

Chuck Adapter, 1-1/2"-8 Thread 4" Diameter, 3 Holes 1918

Lathe Chuck Backplate Adapters 1918 Cast iron lathe chuck backplate adapter fits lathes with 1-1/2"-8 spindle nose thread; Adapter is 4" (100 mm) in d...
littlemachineshop.com littlemachineshop.com

Craig
 
Johnwa said:
One thing to consider is that the spindle register on a SM may have a smaller diameter than a Southbend. I found this when I traded chucks with @YYCHM. My Chuck wouldn’t spin all the way on my SB but fit his SM.
Click to expand...

I've got a South Bend 4J, if you want to trade the PRATT 4J back.
 
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