Re: Machining

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com> 

Hi All,

You have to watch out for the TiN coated bits also.  At EAA in Oshkosh, I
got a set of TiN drill bits made by MIT Tools for $25, and all were ground
wrong.  They skate all over the place, even when center punched.  Should
have bought the $100 set!  I do a lot of exotic tool/material shoping there.
One dealer had 3/8" and 1" canvas phenolic at $120-150 per 3'x3' sheet. (he
forgot to bring them last year)  Also in abundance are carbide cutter bits
in many different styles.  Most are good condition, but some may have small
chips and are useable for drill press machining.  Anyone in the Wisconsin
area will find this a good tool shoping adventure, and might meet myself or
Dr. R there.  Plus the airshow starts at 3pm.

David E Weiss

 > Original poster: Matthew Smith <matt-at-kbc-dot-net.au>
 >
 > Ed Wingate wrote:
 > >Titanium nitride coated tools are worth the extra cost for many
 > >applications.
 >
 > 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.
 >
 > I would extrapolate this out to be good for RSG rotors of similar
materials.
 >
 > Cheers
 >
 > M
 >
 > *I had to go and say it, eh?  My next drilling job is doomed ;-)
 >
 > --
 > Matthew Smith
 > Kadina Business Consultancy
 > South Australia
 > http://www.kbc-dot-net.au
 >
 >
 >
 >