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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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How would this have been made?
http://www.nmm.ac.uk/collections/dis...ture=1#content
Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? -- Michael Koblic, Campbell River, BC |
#2
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How would this have been made?
On Mar 17, 7:56*pm, "Michael Koblic" wrote:
http://www.nmm.ac.uk/collections/dis...ID=D9025&pictu.... Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? -- Michael Koblic, Campbell River, BC Cast then cleaned up on a lathe.You could spin it in parts then soldier it together but that's way more trouble in my opinion. Karl |
#3
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How would this have been made?
On Mar 18, 1:56*am, "Michael Koblic" wrote:
http://www.nmm.ac.uk/collections/dis...ID=D9025&pictu.... Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? -- Michael Koblic, Campbell River, BC Holzapffel's "Hand or Simple Turning", page 17, shows a woodcut from 1568 of a man turning a large sphere on a pole lathe. He is holding the chisel under his arm in the way I've seen recommended for turning metal by hand. I think the base might have been cast in an open sand mold formed by rotating a template of the shape. Fill it, wait a bit, pour it back out leaving a thin shell of solidified metal. " Pyrotechnia" is a thorough description of smelting, refining and casting practice from 1540. The author made bells and cannon, not small artsy stuff, and as the title suggests he concentrates on work done with fire rather than tools, though some tool work necessarily crept in. http://mitpress.mit.edu/catalog/item/?tid=7085&ttype=2 When I was 5 years old we lived near a small foundry. They let me watch as they mostly hand-shaped the sand molds for parts to fix old looms and cast them in aluminum. The tools are similar to those for wax carving. jsw |
#4
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How would this have been made?
Just off the top of my head, probably cast (lost wax
method?) and then turned. Water wheel for power, or horse or oxen walking around an axle. Still, some seriously incredible quality work for that time era. Would have to be expensive, for sure. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Michael Koblic" wrote in message ... http://www.nmm.ac.uk/collections/dis...ture=1#content Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? -- Michael Koblic, Campbell River, BC |
#5
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How would this have been made?
"Jim Wilkins" wrote in message ... On Mar 18, 1:56 am, "Michael Koblic" wrote: http://www.nmm.ac.uk/collections/dis...ID=D9025&pictu... Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? -- Michael Koblic, Campbell River, BC Holzapffel's "Hand or Simple Turning", page 17, shows a woodcut from 1568 of a man turning a large sphere on a pole lathe. He is holding the chisel under his arm in the way I've seen recommended for turning metal by hand. I think the base might have been cast in an open sand mold formed by rotating a template of the shape. Fill it, wait a bit, pour it back out leaving a thin shell of solidified metal. " Pyrotechnia" is a thorough description of smelting, refining and casting practice from 1540. The author made bells and cannon, not small artsy stuff, and as the title suggests he concentrates on work done with fire rather than tools, though some tool work necessarily crept in. http://mitpress.mit.edu/catalog/item/?tid=7085&ttype=2 When I was 5 years old we lived near a small foundry. They let me watch as they mostly hand-shaped the sand molds for parts to fix old looms and cast them in aluminum. The tools are similar to those for wax carving. I figured as much. All those curves... |
#6
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How would this have been made?
On Mar 17, 11:56*pm, "Michael Koblic" wrote:
http://www.nmm.ac.uk/collections/dis...ID=D9025&pictu.... Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? -- Michael Koblic, Campbell River, BC Probably done via lost wax like bells. For something like that, they probably would have made a wooden pattern on a simple pole or treadle lathe, cast a plaster mold to get the reverse, then made wax patterns from that. Chase with hand tools afterwards, that's what apprentices were for. Engineering lathes as we know them weren't around until MUCH later and probably wouldn't have been used on such anyway, they could get a decent finish without them. De Re Metallica has a lot on old-time processes. A lot of techniques were simply not written down, either, were part of guild "lore" and were only passed on master to apprentice. Stan |
#7
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How would this have been made?
Michael Koblic wrote:
http://www.nmm.ac.uk/collections/dis...ture=1#content Specifically the base: The description says "turned brass". In 1600, would it have been turned from a large brass chunk? Would it have been rough-cast first and then "cleaned up" by turning? If turned, presumably this would have been done by hand...? Possibly spun from brass sheet on a metal spinning lathe.The base and post at least were probably done by this method. Wooden forms are made and mounted in the lathe and the brass is worked and formed over the form by spinning the form and the brass sheet , tools are used to shape and form the brass into the forms. It's an old trade and is almost a lost art ,although there are quite a few home shop metal spinners around. -- Kevin (Bluey) "I'm not young enough to know everything." |
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