| Gallery, Projects and General > How do I?? |
| Cutting brass disks from sheet |
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| RussellT:
Hi Chris How about just cutting them out with a nibbler. The type that attach to a power drill will cut 2mm brass and can do tight corners with a cut width of about 3mm. In my experience it's difficult to follow a line exactly so I'm not sure how much wastage there'd be. Maybe you could make a fixture to rotate the sheet brass accurately. Russell |
| smiffy:
Hi I clamp the sheet brass to the drilling machine table ,with a suitable piece of wood between the table and the brass then i use a starret hole saw with the pilot drill removed and useing a very slow speed cut a disc out of the brass sheet .It does need a very ridge set up but i have cut dozens of discs useing this method Hope that all makes scence. Mike |
| Fergus OMore:
Metal Box Company would have used a 'Bob and Aunty' male and female punch. And they did it for billions of billions of roundy things in plate metal. |
| jiihoo:
Haven't done this so this is purely theoretical, but how about punching (or hole-sawing without a center drill) 2 mm or a little more oversize and then turning to size? If this works, it would give you a not-punched edge and minimize the material wastage. The turning you could do with the blank sandwiched between two plywood rounds between the headstock and live center on the tailstock and thus no center hole. Jari |
| raynerd:
Hi Guys Many thanks for your interesting suggestions! It does seem likely that the seller could possibly clamp the sheet between two "pads" and turn it round in the lathe. Regarding the actual method of me turning up brass disks, I`m interesting in this idea of trepanning as suggested by awemawson and Meldonmech Meldonmech - you said something very interesting. About 10 years ago I visited a clockmaker, bearing in mind I hadn`t even seen a lathe until that day and your method of cutting the the wheel was exactly the same as that which he used! Your message brought it all back. Drilling two small holes where the crossing out will be, mounting on a wooden backplate and using a tool to cut (trepan) the wheel. I do appreciate you have tried to detail the profile of the tool...could you give me a little more info on what the tool should look like as I must admit, I can`t picture it! |
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