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Oh he is the moderator on the metrology forum.
I'm curious as to what the box came off of.
I have had hundreds of power boxes and a handful of manual boxes apart. Never saw a sector/piston/nut that small before. Looks like it only has half a loop.
Its from a Sunbeam Alpine. I think the steering box was common to quite few other cars from that era tho.
The nut sits atop the worm, a fork sits on top of that and held down by a spring. Only the top half of the nut engages the worm, the bottom half is a tube to recirculate the balls. Ive got most of the box so will post more pics when I get a mo.
Cheers
D
Having only 1/2 of a loop in contact with the worm looks like there would only be 6 or so balls in contact at any time. Just seems sketchy to me. Although that might have been a way to negate the need for tight tolerancing.
That's another computer screen you can clean the tea off
My buddy also mentioned it helps take the shock out of the steering is you hit a pothole etc. Not sure how true that is but makes sense.
Cheers
D
Coffee as well..
ISTR what was to become Saginaw Gear Division of General Motors implemented the early patents on recirculating ball systems in mass production, 1930's?
Steering was only one application. As with Getrag (not recirculating ball), same goods are fitted to "many" uses, old 1950's fords and newer 1970's BMW's using much the same Getrag boxes.
Rather than make one, better to just find one off some other application. ELSE order a length of the ready-made screw and the balls & nuts to match.
See also CNC ballscrews..
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