maximum spindle RPM?

[12bolts]

I am running a Hercus 9" (SB clone) with plain cast iron bearings. I have a job that warrents changing the drive pulley and upping the spindle speed a goodly amount. The current setup pulley gives me a maximum rpm of 365. I have a pulley that will up the maximum speed to 865 RPM. Not sure if I am going to be exceeding the speed rating for my lathe. I have done a bit of searching but havent yet found anything that specifically lists my situation.
Any ideas anyone?

Cheers Phil

 

[macrnr]

I recall reading a thread on the South Bend site where a fella modified his lathe to run at very high RPM's. You might check there......
Found it
Engineering analysis & experimental evidence for top spindle speed limit?
Post # 69811

 

[Hawkeye]

See if you can find "Text Book of Turning" by P.F. Hercus on line. Pages 7 and 8 discuss the headstock and mention both plain and roller bearing models. It says that both are operated in the same manner. Page 8 has a chart of speeds, including the model with the high-speed drive. Maximum speed listed is 2600 RPM.

 

[12bolts]

--->macrnr. That link doesnt work for me

--->Mike, thanks very much for that. Found it and lists 1050 RPM top speed so as I am not going that high I am happy to think I can run at my 865 RPM comfortably.

Cheers Phil