Reply by GEOwen

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Posted on Shaving Giraffe - a shave horse re-design from Africa

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7 posts in 1935 days

#1 posted 02-09-2013 11:46 AM


No need for a spring to cause the jaw to open any appreciable distance when pressure is released because all you need is for the jaw to relax so that you’re free to move the workpiece around to whatever position you want for the next few pulls on your drawknife/ spokeshave.

Your mentioning a spring did give me an idea….

The purpose of the jaw is to clamp the workpiece so that it doesn’t move when you work on it. With a reasonably sharp drawknife, you’re probably not pulling with more than 20 or 30 pounds of force unless you’re trying to take off a lot of wood with each stroke. No matter what you’re doing, unless you’ve spent a lot of time in the gym your arm muscles aren’t strong enough to apply enough force to break the grip resulting from your entire body weight So, my idea is to let the seat be a separate item supported by a spring on either side with those springs going all the way down to the ground. Those springs are stiff enough to flex only a few inches under your body weight. During those last few inches of travel, the seat compresses a single weaker spring (or maybe a piece of foam rubber?) that transfers weight to the lever action of the giraffe so that maybe 50 or 60 pounds of pressure is applied to the clamp.

Might give some of the seating comfort of having an office chair mounted and would be easier on the knees by automatically reducing the effort needed to relax the clamping action.

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