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14-03-2016 #5
Thanks for that, interesting stuff, my response...
I really don't want to drill the final holes, IMHO, spiralling down should work ok, will need to test it.
Pocketing out the waste - brilliant point, probably never have thought of that one;)
Rough profile exterior - makes sense but favour a 6mm rather than going bigger.
Finish profile exterior with big cutter - if its only got 0.1mm to go, I'm not sure of the point, a 2mm solid carbide should handle that in one pass AFIK - test again.
The smaller internal shape/pocket would need a smaller roughing cutter, probably 4mm, why not go to finish on the same tool?
Tabs are the same in Sheetcam, bottom upwards. So if i have an aluminium bed, I would not want to request a 6mm cut on a 5mm sheet, I was thinking of using a sheet of stiff card or some-such between, I use a lot of 0.4mm hard card at work and that would likely work well, cut would then go to work plus 0.2mm.
I'm generally against babying cutters, on the Bridgeport I find they are happier when taking a proper cut, within the abilities of the machine, but not tickling the metal, especially with carbide which has a larger edge radius than HSS and needs to 'cut' the metal.
Some good points though, noted, thanks
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