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14-02-2015 #1
Is there a metric equivalent of TPI (Turns per inch) in relation to leadscrews?
Apologies if this has been done to death, I dont even know what proper terminology to search for. I am building a solsylva machine - mostly to learn some basics of CNC machine building - and the plans are in imperial measures. I have converted all bolts and screw sizes to metric to make sourcing components easier and cheaper. However the plans call for a "36inch x 3/8-8-4 Start 2 Turn Leadscrew"
I simply cannot find such a thing anywhere. I figured I could use a 10mm leadscrew instead of a 3/8" as they are near enough equivalent. But what is the metric equivalent of 2 TPI. Would that simply be 12mm or 13mm per turn? If so what terminology is used to describe such a thing and what do the "8-4" stand for in my above example in bold?
I find the terminology of leadscrews extremely confusing. Any help would be appreciated.
ThanksLast edited by glynster; 14-02-2015 at 08:52 PM.
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