plastic intermediate gears or metal for mini-lathe?

Gallery, Projects and General > How do I??

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vtsteam:
I believe it.

Even if you wanted to, you'd have your work cut out for you to make a gear train that overlapped threads. It could only happen in the final pair, AND they would need to be heavily eccentric. AND non modulo. If that bad, then they'd be a problem to mesh-- would probably bind or skip. It would be a real challenge to make it happen.

A bent lead screw and loose carriage gibs wouldn't even do it, It would Just give variable depth.

Slip is the only way I can think of, and because the gears are keyed at the power end and the drive end, slip anywhere in the train isn't possible.

Well, excluding slip of the human kind. :) Been there.

NeoTech:

--- Quote from: lordedmond on October 24, 2013, 03:35:07 AM ---cricky that must be a small machine 6004-RS2 has a 20mm bore ?

Stuart

--- End quote ---

Small. nah its a good size 320x900mm, a gunmakers lathe commonly called.. but all the axles for the drivetrain internally runs in those crappy ass bearings.. The spindle bearings is 50mm id

Woodsman22:
"Just because someone buy a machine and can't use it, then slags it off on a web site doesn't mean to say they know what they are doing."

Well John, you and Vsteam could very well be right about Jerry not knowing what he is doing. I, as a novice am hardly in a position to say one way or another. However, here is an article about Jerry Kieffer and his work at the Sherline website.:

http://www.craftsmanshipmuseum.com/Kieffer.htm

It seems that they have a high regard for the man's capabilities, and he has done some remarkable work. You can judge for yourselves.

Woodsman22:
And by the way, the model Harley Davidson motorcycle engine he built can be seen on this page:

http://www.craftsmanshipmuseum.com/Kieffer4.htm

The image of the engine at that page can be enlarged, and the tiny gears and overall workmanship are impressive, at least they are so to me. I would never say that that man does not know how to use machine tools. :D

Joules:
Woodsman22, may I suggest you look on this forum to see what other members have achieved with these lathes as is. If you think the 7x12 is so bad why did you buy one rather than a secondhand Sherline. Take sometime to get to know people here, they are an amazing source of knowledge. Yes some of it can be flawed, who doesn't make a mistake, but understand most speak from experience that they are willing to share freely. Ask questions, listen, ask more questions, you will soon gain respect Grasshopper... :beer:

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