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It doesn't need to be that thick at all Jef, 0.3mm will be quite adequate.
A hole punch like a Roper Whitney size 5 is best rather than drilling. For belts I use the imperial equivalent of 3.0mm for the rivet holes.
If you use the largest punch in the set to pop out the discs, you then change to the smaller punch to make the central holes, Quicker and cleaner than drilling and cutting circles out! :wink:
Then you dish them out in the doming block, but to be honest, they are naturally dished very slightly by the initial punching out anyway.
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Jef. I suppose as Adrian says one could use a doming block, however it is better to have a block which has a hole right thro' it for you have to cut the dome away from the sheet of brass you are making it from. Then when you have created the tiny hemispherical dome it needs it's hole punched into it in order to create the countersink.
Brian Stobbs
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I don't wish to be rude in any way but I don't think Adrian has understood fully just what a bellcap is, if we return to my earlier post where I have tried to explain the function of these things one may get a better understanding of them.
Brian Stobbs
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"...quemadmodum gladius neminem occidit, occidentis telum est."
a.k.a. Paul M.
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Thanks Brian, I see now what you mean. I think I finally have to go and buy me a nice circular cutting tool. (but that would be next month untill I've the money for it)
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Actually Ade, the technique Brian uses is part of the trick of these things.
Once you make the domed cap, to punch the hole which dimples the top back in too, and allows the rivedet to be peened neatly into it.
Works for various sizes, and you only need 2 steps.
1- Punch out a domed cap
2- Hole and counter sink
viola!
Visne partem mei capere? Comminus agamus! * Me semper rogo, Quid faceret Iulius Caesar? * Confidence is a good thing! Overconfidence is too much of a good thing.
[b]Legio XIIII GMV. (Q. Magivs)RMRS Remember Atuatuca! Vengence will be ours!
Titus Flavius Germanus
Batavian Coh I
Byron Angel
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There is a modern washer that is a variation on this theme, but I can't remember it's name. It has a recessed flat area, but a raised rim. The rim protects the bolt head, for whatever reason. Good ideas stick around, it seems.
M. Demetrius Abicio
(David Wills)
Saepe veritas est dura.