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Industrial friction screw press.
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Previously:
https://www.homemadetools.net/forum/...389#post177394
https://www.homemadetools.net/forum/...462#post158549
https://www.homemadetools.net/forum/...554#post170247
https://www.homemadetools.net/forum/...774#post159797
https://www.homemadetools.net/forum/...224#post130648
Note the interesting method of changing the direction of the press screw by using rotating plates.
Amazing piece of equipment.
Post *1 Enlarged version of a bench tapper; a low power electric motor powering a reduction box, identical CW-CCW friction drive. Those are usually a cone shaped hub of rubber, slip-fit axle rides in pillow blocks. Operator pushes part to engage CW clutch plate, driving tap, usually processing a through hole. As tap achieves depth, tap reverses simply by pulling back on part, engaging opposite clutch plate.
For small taps, part is guided on a rod, but still hand held. Unclear if they are shop-made, a commercial device or both, which I suspect is the case.
The GIF is a mechanized fly-press. They use multi-start threads, commonly 3 or 4 pitches.
Outboard motors use the same principal to reverse the prop only instead of a friction drive they have bevel gears.
Tearing down just one lower end, convinced me, V-drives belong on boats. Larger boats, Twin Disc direct.
And if the vessel is big enough the main engine idles at 22 RPM and only turns 90to 100 revs full throttle while developing 109,000 HP.Quote:
Originally Posted by Toolmaker51