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Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz>
On 19 Apr 2004, at 7:23, Tesla list wrote:
> Original poster: Matthew Smith <matt-at-kbc-dot-net.au>
> Ed Wingate wrote:
> >Titanium nitride coated tools are worth the extra cost for many
> My (limited) experience of drilling G10 PCB stock with a cheap'n'nasty
> drill press (the Aussie equivalent of one a US 'Harbor Freight'
> machine) confirms this. Although for the sub-1mm holes, I have to use
> carbide bits with an oversized shank, as they are all I can get. It's
> an expensive job as the play on the chuck causes a lot of breakages.
> 1mm+, I have a set of TiN coated bits. These are just beau-u-u-tiful
> on PCB stock, cut fast, don't break* and leave good, clean holes.
To minimize the chances of breakages when drilling sub-1mm holes in
Cu-fibreglass board with W-C drills I put a 1/2" - 1" thick slab of
styrofoam on the platform and put the board on top of that.
> I would extrapolate this out to be good for RSG rotors of similar
> *I had to go and say it, eh? My next drilling job is doomed ;-)
> Matthew Smith
> Kadina Business Consultancy
> South Australia