Reply by RobynHoodridge

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

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127 posts in 2325 days

#1 posted 01-31-2013 12:16 AM

Hi Mads
Thanks for taking the time.

Yes, you’ve understood the concept.
The thing about using the body weight to cause the clamping is that the standard state is with the jaws clamping the work. Good for tasks that need long sessions of the clamped state, but probably not good for drawknife work.
You asked if it’s possible to turn the work while sitting. Well, not in the most basic form of the design. There are ways to make it possible. None i’ve thought of make it as easy as it is with a shaving horse. Here’s one idea for making it possible-

The handle (or some other version of handles) in blue give you something to push on to forcibly open the clamp with your upper body against all force of the clamping action. Not something you really want to be doing much of. A foot actuated lever below the bench could also be developed for lifting the bench and therefore un-clamping. And here leg action would UN-clamp the work.

Yes, to remove clamping force you would have to remove force down on the bench. I think that a balance could be found by tweaking the design so that the weight of the bench only causes a light enough clamping that the work could still be manipulated, but when sitting on it that force is much greater.
I’ve also thought of a spring to counteract only the clamping that’s due to the bench weight. But all of these things are complications.

So all round, it’s not going to be a natural thing for the giraffe design to clamp and un-clamp repeatedly.

The idea of a fold-away leg at the rear is great. Thanks.


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