You want to learn collets, go to the Hardinge website, nobody covers collets like they do. Then, manufacturers have their own too! There are 100's.
Collets exist in two basic forms; workholding and toolholding. Even when diameters are the same, the steps to next size are much smaller in workholders. 5C's main advantage is the range of sizes, shapes, and commonality; whatever collets a shop has, some will be 5C. Toolholders tend smaller to keep spindle and quill diameters reasonable, big bearings = big money. Not much issue in lathes, certainly milling and drilling for many reasons. 2J is another workholder, kind of overgrown 5C at 4x cost. I can't pop those $$'s. I scored a bucket of good 215's a year ago. Not popular but in scale with 2J. Looking for a D1-6 lathe collet nose, all are used and beat. BUT a couple are posted here, 5C, but dangit I know how to measure. Important part, they undertook a precision build under their own roof successfully. Their text is perfect proof of concept. When the electricity goes in, that will be Project One, exercising a lot of resources within.
Maybe its exorcising, maybe excising, whatever. Wild browser wants to spell check me, but don't know Jack about a manufactory vocabulary. Can't figure how PC's get made in the first place without it! I constantly add them, but the more I write, red squiggles still appear like confetti at a New Year's party.
That's me in the recliner, laptop and literary lubricating liquids in hand.
Letting ligaments of the left not linger or lapse during liaison of liter to lips, of course.
yep it's fothurtyindamornin!

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