It's been a while I've not posted anything fresh here.
Here is my last tool, a serious one, it necessitated a lot of head scratching to solve all the technical problems to build a fully featured one.
Here it is :
It is entirely home made.
The bowl :
Do you know how this is called in French ? It is "un boulet de graveur" which means "engraver cannonball".
It is because back to the early times, this tool was made with a cannonball, cut in two halves..
Unfortunately, I couldn't find a cannonball, but I did found in my kitcheen a nice stainless steel bowl, with a pretty perfect half ball shape. I decided to sacrifice it, it was a heartbreak but I did it ... (I promised to my wife that I will buy another one, but so far, could not manage to find another one as good as this one )
So here is the cooking I did with it :
The base for the bowl
From firewood (could be a nice ashtray , but I don't smoke.
The rotating plate and vice
In the middle of the bowl, I sunk a 20mm shaft, on which I pushed a couple of big ball bearings. The bearings are inlaid into a turned wooden base, on top of which there is larger plywood plate.
Then I wanted to make a vise that opens symmetrically.
My fundamental research led me to this item, that I cut into several pieces .
The workpiece grip
I wanted a general purpose tool , but most of the pieces I'll have to grip will be flat metal pieces, so I decided to go to some holes , with little dogs, similar to the bench top dogs, but smaller.
As for the benchtop dogs, the issue is how to pull the dogs when you put them too dip in the hole.
Here is how I solved that :
and I also have four holes that are threaded to accept some screws that will allow some tigh clamping down.
Last but not least, I wanted a system to block the rotation, in order to be used when using a hammer and burin. Here again, a lot of
I came up with this nice drum braking system (Ken, if you need one for your red car, just tell me)
And here it is !!!
I'm preparing a little video, but not sure it will work, it's still in preparation
Last edited by Christophe Mineau; 03-13-2015 at 09:37 AM.
No I finished up with plaster, but the main part is steel scraps found here and there and chopped into pieces, melted together with 7 kg of lead. But the top surface was not very nice so I finished and filled up the rest with plaster.
Before plaster, it was pretty ugly like on this photo :
The bowl is very heavy, I think it must be ~12 kg for 20cm diameter.
It provides plenty of inertia, that's what I wanted.
Thanks, but for the engraving work, no, I'm afraid, not yet, I'm a complete student for the moment, and it's a lot of work before having something that can be shown.
The piece I show on the video is not made by me, it's an industrially produced tailpiece cover for a mandolin, and it's typically the kind of piece I wish I will be able to make myself
one day ...
but now, at least I have the tools !
Thanks Christophe! I've added your Engraver's Bowl Vise to our Vises and Woodworking categories, as well as to your builder page: Christophe Mineau's Homemade Tools. Your receipt:
Regarding the brake, while I appreciate the thought (and love the design!), I'll be sticking with this:
Though it's a piece with a lot of wood , it's indeed for metal engraving, so could be more in metal working.
Depends if you deal with the tool itself, or the purpose of the tool.
Talking about your brake ...
(but I continue to be thinking that your car is missing some piece of wood, maybe just for the keyring if not the braking system)
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