On Sat, Nov 07, 2009 at 08:13:56PM +0200, Roland Jollivet wrote:
> I watched milling of aluminium toothed pulleys at a company once. They had
> put a whole lot of 2" discs on a shaft, maybe 10" long, tightened up, and
> had the whole thing in a dividing head, then just milling grooves with an
> end mill. If there are buyers for the pulleys, you could do the same. The
> effort is almost the same, and you get to recoup your time costs.
Ah, yes, that is more economical than doing them individually, yet
better quality than cheapo extruded pulley centres.
> While discussing pulley shapes, I thought this is quite interesting. See
> picture (not the best though). One might expect the belt to jam, but it
> obviously does not. Notice the flanges are on alternate sides. This allows a
> pulley, with walls, to be moulded in a simple two part mould. Completely
> irrelevant here, of course.
Now that's even more interesting, because I'm not willing to give up (at
least one) integral cheek. For HTD pulleys, milled from the side,
alternating flanges are a definite possibility, if angular registration
is restored after flipping the half-done blank. Thank you for that one,
too. :-)
Erik
--
One man's constant is another man's variable.
-- A.J. Perlis
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