In message <000b01c588b5$d02dd590$6401a8c0@family>
"Earl T. Hackett, Jr." <
hacketet@...> wrote:
> When running, the drill bit should not look like a dog wagging its tail.
I suppose that's a good way to describe it... The end of the bit looks like a
vibrating blur.
The Expo Zircon is off my list - apparently it's just as bad as the Expo
Reliant in terms of instability (it certainly seems to use the same "keyless"
chuck). Expo also seem to be very hesitant to give out actual
specifications...
The Proxxons look ∗VERY∗ nice, but are a bit too expensive.
I'm using FR-4 (fibreglass) laminates and Kemmer and Tycom tungsten carbide
bits with the enlarged shank. They're regrounds from a commercial PCB fab
plant - quite good quality, actually.
Later.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem@... | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/ | 48xCD, ARCINv6c IDE, SCSI
... CAD : Can't Anybody Draw?