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10-12-2009 #1
Yes there is a calculator that will tell you the critical sceep of a screw and this is based on the root diameter the lenght and the type of mounting.
based on 1500mm and a 20mm diameter screw with a root of say 17mm and fixing with a fixed end and a floating end the critical speed is just over 900 RPM.
If people are claiming faster speeds this may be the case but this will not be within the specification of the screw and over time will damage the screw.
Use this link
http://www.nookindustries.com/ball/BallCalculators.cfm
I am off out now, but will have a look at the rest of you post tomorrow.
Visit Us: www.automationshop.co.uk
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