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Author Topic: make a copper dome  (Read 7121 times)
Endeavour Cull
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Netherlands Netherlands



« on: February 28, 2010, 04:25:29 pm »

Here I give a brief howto on making a copper dome without expensive tools. It is loosely based on how they make boilercaps and boilerdoors for model steamengines.
I don't pretend that this is a master coarse, but it will do the job. I invite you to come up with better ideas, because there isn't much to find on the net.

Here we go.......

You will need:

copperplate
a vise
thick wooden blok
a saw to make circles (diameter has to be the diameter of the domeshaped solid plus at least 2 times the thickness of the copper plate)
a massive domeshaped solid as the stamp

1. First saw the hole into the thick wooden log and round of the edges for about one third of the log thickness. Picture 2a gives the ideal shape and made of steel it would be even better and the advantage is that you can make the dome and hole fit each other. It is difficult to find a saw and a domeshaped stamp precisely of the right diameter.
2. Then make a circular copper plate a bit bigger than the hole in the log. (Don't use a centerpunch to set out your circle, because it can rupture there)
3. Anneal the copper plate with a hobby burner or on the bbq (redhot or cherry red will do fine)
Put the log, copperplate and the domed stamp between the jaws of the vise and close it gently.
4. When you get to much folds into the copper you can hammer them out and anneal the copper again. This has to be done frequently and has no bad effect on the copper.
5. If the copper plate goes to one place then you have to align it again.



For a domeshaped stamp you can also use a thin sheet knob filled with lead.

I hope this how-to is clear enough to get some good results.

 



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JingleJoe
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« Reply #1 on: February 28, 2010, 05:49:17 pm »

That has some really great results! Its very interesting to see how you do this, however I think I will still stick to my just-hammer-it method Wink
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Green Dungeon Alchemist Laboratories
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Reckless Engineer
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« Reply #2 on: February 28, 2010, 07:42:50 pm »

This works a treat! Used it for many boiler end caps.

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sidecar_jon
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« Reply #3 on: March 01, 2010, 02:15:20 pm »

All very technical...and accurate no doubt, but i too will stick with hammers sand bag and brute force!
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Dr cornelius quack
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« Reply #4 on: March 01, 2010, 10:08:33 pm »

Nice work that man!

Tin bashing is very satisfying work, specially with non ferrous stock.

Would you finish up by plannishing  on a dome stake?

These people stock some useful domeing punches and blocks at very reasonable prices.
http://www.proopsbrothers.com/acatalog/Online_Catalogue_Metalworking_27.html

'bout halfway down the page.
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Endeavour Cull
Snr. Officer
****
Netherlands Netherlands



« Reply #5 on: March 01, 2010, 10:21:26 pm »

Nice work that man!

Tin bashing is very satisfying work, specially with non ferrous stock.

Would you finish up by plannishing  on a dome stake?

These people stock some useful domeing punches and blocks at very reasonable prices.
http://www.proopsbrothers.com/acatalog/Online_Catalogue_Metalworking_27.html

'bout halfway down the page.


Thanks!
I can use the dome for pressing and also for finishing it hammering around the edges on the domeshape.
(It is actually a piece from an artificial hip, so it is very hard). No, It wasn't my mother in laws' .

The prices on that site are quite reasonable.

« Last Edit: March 01, 2010, 10:23:10 pm by Endeavour Cull » Logged
architect
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« Reply #6 on: March 08, 2010, 03:05:20 am »

for those seeking these doming blocks in teh USA you can get them from harbor freight
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