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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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I Need help with carbide insert application design
Take a look: http://www.metalworking.com/DropBox/wire_cutter.jpg
This rough drawing shows a cutter to cut 3" pieces of flat steel wire, 3 at a time, every 0.5 seconds. The wire is advanced through the block between the two shown 3/4" x 3/4" x 1/4" carbide inserts. Notice the notch in the lower insert. The arm pivots on a 3/4" shaft in 2 Timken bearings in the bored hole in the block nearest the step. The other bored hole has bearings for the 1" shaft that has a cam follower with a 5/16" offset to act as an actuator cam -not shown. The cutter arm also has a 3/4" x 3/4" x 1/4" carbide insert. As the cam makes the arm pivot the wire is cut and a spring returns it to the open position. The part I need thoughts on are how to pre-load the carbides in such a way that it is easy to unload to change the carbides...(notice I get 8 cutting edges on each insert!) The lower carbide should last almost forever as it is not used in cutting and has the guide notch ground into it. I wonder how much pre-load is needed on the carbides, they will be sliding on each other's faces. One thought is to have the carbides backed up with a block of steel that slides in a cut-out in the main block but can be clamped tightly and have a differential screw apply the loading pressure then clamp the sliding block. The goal is to be able to change the carbides in a few minutes and have a positive, easily adjustable and reproducible pre-load. Oh, by the way, the assembly is not extremely accessible. I figure if the carbides are real easy to change, they will last a long time and if it takes an hour, they will need to be changed often...Right? |
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