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- Newsgroups: rec.woodworking
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- From: taylor@dominy.enet.dec.com (Bruce J. Taylor)
- Subject: Re: Treadle lathe
- Message-ID: <1992Dec30.220659.4695@nntpd.lkg.dec.com>
- Sender: usenet@nntpd.lkg.dec.com (USENET News System)
- Organization: Digital Equipment Corporation
- Date: Wed, 30 Dec 1992 20:20:38 GMT
- Lines: 52
-
-
- In article <1h8pneINN5cs@msuinfo.cl.msu.edu>, Eric Kasten writes...
- >I was wondering if anyone had any opinion on a treadle
- >lathes? It's been a few years since I last used a lathe,
- >and I'm more accustomed to the motorized variety. Lately
- >I've been contemplating constructing a treadle lathe -
- >I read somewhere lately that someone had switched back to
- >a human powered lathe from a motorized one because it gave
- >him greater control - and was wondering if anyone had
- >any thoughts on the use, construction of such a lathe?
-
- Well, I've done a fair amount of spindle and bowl turning, and I've
- even done some on a steel treadle lathe from the late 19th century.
- It was interesting, and even fun - but I would NEVER switch back for
- control or any other reason. Here's why:
-
- 1. It's exhausting work. Figure that a modern lathe with ball-bearing
- spindles needs a minimum 1/3-hp motor to be useful. Can you deliver
- 1/3 horse with one leg for long periods? Also, the flywheel bearings
- are going to eat into the energy, and so will the headstock, if you
- use the standard bushing or pillow block techniques. This is why the
- old-timers had apprentices - to turn the "great wheel" that drove
- the headstock.
-
- 2. It takes a lot of coordination. Since you've done some turning, you
- know about the "woodturner's lean" - tool handle braced on hip, blade
- supported on tool rest, now lean your whole body to move the tip.
- Well, you can't do this if you're pumping the treadle with one leg,
- so you have to use just your hands for tool control. You lose a
- lot of control that way.
-
- 3. Inconsistent speed. No matter how careful you are, and how heavy your
- flywheel (the lathe I used had a 3' steel wheel - I guess about 120lbs),
- the work still spins faster on your power stroke. This takes a lot of
- getting used to. Also, you can break an ankle if you lose the rythm of
- the treadle.
-
- Like I said, I would never build a treadle lathe for "greater control",
- or for production turning. However, I WOULD build one in homage to the
- old-timers, who accomplished such wonderful work despite all the draw-
- backs I listed. To understand the difference in tools and techniques
- between then and now, you really have to belly up to a treadle lathe
- and get all sweaty - no amount of reading Roy Underhill can really
- teach you.
-
- By the way, if you decide to go ahead with this, my favorite design is
- in "Fine Woodworking on Machines." The one I'm thinking of uses a bicycle
- chain and freewheel to decouple the treadle from the headstock spindle.
- Slick design.
-
- Good Luck -
- Bruce Taylor
-