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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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Building a tracing machine 2 projects
I was posting here a while back for info on tracers and pantagraphs.
which leads to wondering about just building something. What I am trying to do is stack 6 .050 thick brass blanks and at least do alot of the roughing to match some patterns we have to duplicate. Most have many tight curves and I usually have to lay a piece out bandsaw as close as I can and then die file. some of these are alot of work and not cost efficient. These are patchboxes, toeplates and sideplate for muzzleloaders if ya know what that is. If I could mill out 75 % and then go in with saw to get sharp corners and also have less die filing it would save me ALOT of work. Waterjets, wire EDM, all that fancy stuff is too expensive. Its either some cheap system or doing it the same way as before I wondered if I could make a system using something like Thomson bearings in the x and y axis with my pattern at say 6 in from my clamped blanks. And also at 6 in a bearing same dia as cutter as my guide. I'm wondering about all the vibration and bouncing this is going to cause at the cutter and how to dampen this. I'm still going to be die filing a bit all over the parts but the smooter the finish the easier all round. The second project is cutting info wood using a router as cutter. We have patterns and are trying to cut channels for muzzleloader rifle barrels. Were trying to duplicate some old guns so there are several different shapes to do. Plan so far is to use Thompson bearings and run the axis on a tube frame. the y axis runs on the x axis and at the center is a pivot blank to the left and pattern to the right. Anybody see any problems with this? I've used thompson shafting before but we used it just for moving large objects on frames we build on dip molding machines. I'm just a lowly machinist and find myself for the first time with out some know it all engineer telling me to do everything and somehow I'm now the shop know it all --- God help us |
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Building a tracing machine 2 projects
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#3
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Building a tracing machine 2 projects
There are at least 4 different gunstock duplicators on the commercial
market. Google for "gunstock duplicators" and you can get some ideas for constructing your own. No sense in trying to reinvent a device that's been around for many years. Randy "ken" wrote in message om... The second project is cutting info wood using a router as cutter. We have patterns and are trying to cut channels for muzzleloader rifle barrels. Were trying to duplicate some old guns so there are several different shapes to do. Plan so far is to use Thompson bearings and run the axis on a tube frame. the y axis runs on the x axis and at the center is a pivot blank to the left and pattern to the right. Anybody see any problems with this? I've used thompson shafting before but we used it just for moving large objects on frames we build on dip molding machines. I'm just a lowly machinist and find myself for the first time with out some know it all engineer telling me to do everything and somehow I'm now the shop know it all --- God help us |
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Building a tracing machine 2 projects
For doing all of the little metal pieces, a pantograph mill is quite
versatile. Make a large pattern (5-10x the part size depending upon how big you want to work with and how big the mill is) by cutting a step in a sheet of plastic (or cut out a piece of plastic in the shape and glue to another piece) and you then trace around the pattern and cut the metal with the cutter in short order. Use the right size stylus (x times the size of the cutter) and you will faithfully duplicate the part to the size of the cutter for radiuses. You can also use the pantograph to mill out the holes in the wood for the metal pieces to a very high accuracy, even to the point where you can just press the parts into the wood and they'll stay until you pry them out. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works every time it is tried! |
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