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Has anyone ever used these?

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Bernd:

--- Quote from: Darren on December 14, 2008, 07:32:17 PM ---Feel free to shoot me down in flames here, cos I could well be wrong,

But I think I once saw a Utube demonstrating how these hobs are used, I believe the hob was mechanically spun and the gear blank was free rotating, only driven by the hob itself? Or did I just misunderstand?



--- End quote ---

No Darren you saw right. It'll work. It's just like a worm gear driving a worm wheel, except that it's cutting. But remember that the gear your cutting is free wheeling so one wrong move and you could end up with a broken cutter or even worse a broken machine. It'll work with a tap also as a cutter. The other thing is the cut gear would not be of proper form. Hope this has answered your question.

Bernd

Darren:
Thanks Bernd,

I had another search for that demo but all I could find was both parts driven in sync.

I was beginning to question how old I was...!!  :D

Bernd:
Can you supply me with a link? I'd like to have a look at that.

Bernd

Darren:
Hi Bernd, just search Utube under "gear hobbing" loads of vids to watch if that's what tickles you  :)

http://uk.youtube.com/watch?v=jsDdELruCe4

Bernd:
The pic was of a very old manual hobber and as you said driven in sync. If you go to the bottom of that pic you'll find a video of a Gleason hobber. I worked on the first generation of these when the company came out with them. All driven with servo motors. Very little to no gearing in the machine it self. Kind of ironic that a company producing gear machines gets rid of the gears in thier own machines. But the quest for speed is what drove that.

Bernd

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