Homebrew PCBs

I suppose there's a FAQ I could add this to...

http://www.store.yahoo.com/drillcity/pcbkit.html
http://www.store.yahoo.com/drillcity/5pacresdrilb.html
http://www.store.yahoo.com/drillcity/5pcnewwirsiz.html

Default hole sizes in Eagle are 24mil (#73), 32 mil (#67), and 40 mil (#60). 
62 mil and 1/8" are handy for hold downs and mount holes.

The small bits really like higher speed; I run them at 30k rpm. I think your 
burrs will work just as well at that speed.

----- Original Message ----- 
From: "soffee83" <soffee83@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, December 11, 2005 6:27 PM
Subject: [Homebrew_PCBs] Re: Do these diamond burrs suck?


> Thanks for all the replies!
>
> Yes, I am actually using a drill press (a smaller Delta). I can't
> imagine doing some of these boards by hand. I usually have a solid
> backer board to keep the exit side clean too. I'm also thinking of
> sticking a pulley and cord on the ceiling and hooking it to a bass
> drum pedal or something to lower the quill, so I can use both hands.
> The drive belt usually stays on the lowest speed.
>
> The dental burr recommendation originally came from some usenet or
> website discussions about longer lasting bits for PCB work. The Dremel
> burr made decent cuts while it lasted, but from what you guys have
> said, I probably just got lucky on the style of cutting edge they used
> or something.
>
> If anyone knows an eBay dealer,etc. who normally sells the large
> quantity of one size (like Stefan mentioned), I'll probably be
> shopping. I've looked before, but I didn't really know the standard
> size (for resistor type holes) and most of the deals were for
> assortments. I've got two decent sized cases of the "#" valued bits in
> just about every size under 1/4", but I've eaten up the first few
> small ones in both sets. I should be fine for all the regulator type
> sizes up.
>
> BTW- Some other info also recommended HSS against carbide stating that
> the carbide was brittle enough to snap frequently on PCB's. They said
> to go with a quantity of regulars and just replace them every so
> often. Going by info here, I guess carbide is a decent choice
> afterall. I'll still probably want a lot either way.
>
>         Let me know if there's any shopping pointers.
>
> -Thanks!
>
>
>
>
>
>
>
>
> Be sure to visit the group home and check for new Links, Files, and 
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBs
>
> If Files or Photos are running short of space, post them here:
> http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
> Yahoo! Groups Links
>
>
>
>
>
>