What is critical in producing something like this is that the working surfaces ie. the punch and shear plate be of the same material in both composition and hardness. The guides are fine in Perspex however you must use very close tolerance drills and bolts as well as index pins to keep everything perfectly aligned. during the drilling process and final assembly. Failure to do so could cause unwanted shift in the plates and create a condition that will cause premature wear on the shear plate and punch. The design concept is excellent it is in the execution that all the bugaboos are lurking. Former metalsmith and machinist, Rick H.
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Rick
you are absolutely right. The limited tools I have at home mean compromises and a tool which may wear out over time, but it should last a few years and is easy enough to replace.
Hopefully the design overcomes some of the problems. By bolting the two plates together they should stay aligned and the 1mm washer gives me the space to put plastic card and foil betwen them. hopefully the issue of drill tolerances is solved by drilling the hole, and then Turnign the drill upside down and using the blunt, shaft of the same drill as the punch.
peterComment
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Pete, you are right in thinking this is a good solution with limited tooling on hand. I took the liberty of posting enough information so those that view your thread have the option of building the most effective tool with a little longer life engineered into the manufacturing and assembly process. Hope I didn't ruffle your feathers. Cheers, Rick H.:smiling4:Comment
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Rick - don't worry, it take a lot more to ruffle my feathers, your post also gave md the opportunity to explain why I fixed the teo plates together, unlike the one I bought from Historex Agents a few years ago.
peterComment
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Cheers, PeteComment
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