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therefore maybe something like these at the right speed...
Dremel Brad Point Drill Bit Set - 631 | eBay (they go up to 1/4")
never used them for tin, but they work great on acrylic! (& handy to have in your arsenal of bits - especially if your machine is confined/restricted to a 1/8" collet, such as a rotary tool in this arrangment - https://www.google.co.uk/shopping/pr...g&ved=0CCAQrRI)
I want to avoid drilling if I can , I want a sort of high bred clamp come punch template combo , ill work on it and see what I can do, thanks for the replies guys :)
juliuscaesar
Hi Fivetide
regarding die press, a decent pillar drill should provide enough pressure for punching thin stuff,clamp your die to the table (simples)
What about this sort of punch press?
eBay item no.
121130794607
Whitney punch
Ebay 221245161892
peter
You'd probably get a decent hole if they were drilled with a milling slot drill. Probably a nice job for a CNC. Unless you fancy building a CNC punching machine...
Rotabroach annular cutter (aka mag drill cutter) often does a good job on sheet too... but you'd probably need a mill to hold the shank (fits nicely in a 19 mm ER32 collet). Sizes go down to 12 mm in standard series, never tried the 'mini' ones.
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ah just seen it's a 1/4 inch hole so as you were...
All great ideas but I have to be quite accurate with the holes, after marking them out then drilling chances are they won’t be that accurate. The PCB has about 5 mounted parts that need to go through the holes on different sides and there’s no play. Plus they have to be neat. So that’s why Im thinking of making a template I can slip over the edge of the tin box, sort of an inverted U shape and then using a hardened bolt that’s been cut down with a cutting edge done on a lathe that then screws through the die and punches out the holes.
A bit like these:-
Q.max Sheet Metal Hole Punch 25mm
But I don't think they are made down to 5mm. ...Clive