RE: [MedievalSawdust] Re: New, and with ignorance aplenty, and with a sketch Q
- Frode - To stop the walking you may try to weight it or stake it to the ground .Jamie Blackrose-----Original Message-----
From: firstname.lastname@example.org [mailto:email@example.com]On Behalf Of frode_kettilsson
Sent: Sunday, October 10, 2010 8:19 PM
Subject: [MedievalSawdust] Re: New, and with ignorance aplenty, and with a sketch Q
I added the pic in two additional formats, just to see what happens. I found the shortcomings you mentioned while experimenting with a chair. The work piece does want to move around a lot when being draw-knifed, though I was working on a smooth floor.
I also ran across this;
but so far have not found any supporting evidence. Your thoughts? The dress looks later than 600 CE, but the leather straps and foot lever speak to the simplicity of your earlier description. I actually tried making a version of this out of 2x lumber and leather straps, and while it works fairly well, it is so light as to be virtually unusable, i.e., every time the draw knife dug in I walked the whole thing across the floor. Pics of that are in the album, too.
--- In firstname.lastname@example.org, conradh@... wrote:
> On Sun, October 10, 2010 7:14 am, frode_kettilsson wrote:
> > I posted a sketch in a album named "Frode's musings" of simple bench
> > with a strap holding the work piece. Is this a correct interpretation of
> > the description below? Thanks,
> > Frode
> > --- In email@example.com, conradh@ wrote:
> > ...A primitive possible shave horse
> >> ancestor is a simple bench, straddled by the worker like a shave horse.
> >> A
> >> leather strap or rope has a stirrup-style loop at each end, and goes
> >> over the work. The work is pinned down to the bench in front of the
> >> worker by his feet in the loops. Add a raised platform for the work in
> >> front of the operator, which is easy and obviously useful, and only the
> >> foot lever has to be added to invent the shave horse...
> Couldn't make the sketch come up, but many examples are in the books.
> There are some major weaknesses to the technique in practice, which
> probably led to the development of foot levers and wedging systems.
> In particular, if you try this you'll discover that basic trigonometry and
> vectors are of more than theoretical interest. The strap's holding power
> depends on a workpiece that either sticks up a fair ways above the bench,
> or is close to but narrower than the bench's width. File cutters were one
> craft that traditionally used this holding system, but they had a raised
> block of lead, a soft anvil, that ran down the middle of the bench. The
> lead block was only a little wider than the file blank they were chiseling
> teeth on, and thick enough that the strap had an effective angle of pull.
> (The lead protected the just-cut teeth of the first side when they turned
> the file over to cut the second side.)
> The strap also won't hold anything wider than the bench very well. (It
> still holds stuff down, but the work can slop around from side to side.)
> In some woods, you can even break unsupported edges off the workpiece from
> the pressure of the strap.
> Advantages are mostly that it's cheap, it has a quick clamping action, and
> that within its size and shape limitations it can hold oddly shaped
> pieces. It's probably at its best as an accessory for some bench you
> already have and use for other purposes, or for repetitive production work
> such as the file makers did--where you can make a block or jig that takes
> a single size of workpiece and optimizes the strap's holding power.
> I've been saying "strap" here, but a rope can often be used as well. ISTR
> some Japanese workers have used a light-duty version where the workpiece
> is on a block in front of a sitting worker, whose big toes pull loops in
> the ends of a cord over the work.
And if you want to go the investigative route in the shop, you can always pick up a device called Kill-a-watt. It’s a device you plug into the wall outlet and then plug your electronic device into it and it will tell you what it’s drawing. More or less. I see them at radio shack personally. $100 bucks is a lot agreed.
Not to throw in a 'me too'. But ... yeah, I can't see how a little shop
work could add $100 to an electric bill. My computers eat up more
power than an hour+ in the shop does. And that's with 220V tablesaw,
220v dust collector, and who knows what else running semi-constantly.