Chuck closing force

So what's the rule here, how do I know where to set it? Other than if the part flies out it was too low.
Hyundai HIT-18S lathe
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Randy wrote:

Randy, My Daewoo manual says that 300 PSI is max. This is for a 6" 3 jaw Kitagawa made by Sam Wo in Korea. I've run parts much lower but I set the max RPM down so if I'm using constant surface feet the centrifugal force doesn't over come the clamping force.
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wrote:

Name plate on the machines says 370 psi, 26 kgf/cm2 MAX. 4200 RPM max. B-210 kitagawa chuck. I am running 200 PSI holding 1.25" solid alum bar. hard jaws.
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Randy wrote:

Randy, You should be just fine like that. I'd probably run that in a collet setup here, but you may not have that option. I sometimes will run collets in 400 PSI range without problems. Too much pressure on the chuck and you run the risk of cracking the chuck body casting.
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wrote:

That was my next question... I have a 5C collet nose for the machine, how much pressure to run there, I would think 200 would be enough as the stock is smaller. What size collets are you running? 16C?
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Randy wrote:

Randy, I use 3j collets, but only because I can get 1 3/4 through the spindle that way. I think that 200 PSI with your collet would be fine. I run lots of aluminum, 1018, 400 and 300 SST at that pressure setting.
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