Thanks Alans Home Workshop! We've added your Vise V-Blocks to our Vises category,
as well as to your builder page: Alans Home Workshop's Homemade Tools. Your receipt:
New plans added on 11/22: Click here for 2,593 plans for homemade tools.
Previous video for collet chuck for hex head bolts is available here:
Collet chuck for hex head bolts
 of the imagined triangle (the 'tooth space') is A=10mm,
then the Dmin of the round stock is 10*0.707=7.07mm
and the Dmax A*1.414=14.14mm.
For practical reasons add an allowance of 0.2mm which results in Dmin=7.3 and Dmax=13.8.
The next smaller triangle (theoretically) would have a long edge of 7.07 / 1.414 = 5mm. The smallest diameter possible in a 5mm triangle is "Pin It")
I like your crocodile's jaws. But I would concede it less teeth.
If the long edge (hypothenuse) of the imagined triangle (the 'tooth space') is A=10mm,
then the Dmin of the round stock is 10*0.707=7.07mm
and the Dmax A*1.414=14.14mm.
For practical reasons add an allowance of 0.2mm which results in Dmin=7.3 and Dmax=13.8.
The next smaller triangle (theoretically) would have a long edge of 7.07 / 1.414 = 5mm. The smallest diameter possible in a 5mm triangle is 5*0.707=3.535mm
The next larger triangle (theoretically) would have a long edge of 14.14 / 0.707 = 20mm. The largest diameter possible in a 20mm triangle is 20*1.414=28.3mm
Therefore 3 'tooth spaces' of A=5 and 10 and 20 would cover a range of 3.5 to 28mm.
(Sorry for not providing a sketch)
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