Homebrew PCBs

----- Original Message ----- 
From: "Stefan Trethan" <stefan_trethan@...>
To: <homebrew_pcbs@yahoogroups.com>
Sent: Friday, June 20, 2003 10:22 AM
Subject: [Homebrew_PCBs] Which drill bit sizes would you suggest to buy?


> hi!
>
>
> I want now to buy some carbide drill bits now at ebay.
> there is a guy selling used, but sharp, bits. (all customers are very
> satisfied without regrinding them)
>
> i will have to order them soon because he also offers carbide mill blades
> now, this blades look like a circular saw
> blade but have a slightly bigger center hole (22mm). the outer diameter is
> 55mm.
> they are made of carbide steel and i think they would be suitable as
> circular saw blade.
> the carbide blade from proxxon costs eur30, these blades are much cheaper.
> sure, i will have to make some kind of adaptor to mount them on a 10mm
> spindle but i think i can do this.
>
>
> but to the drills:
> he sells 100drills for ~eur 20.
>
> so i can take some...
>
>
> but which diameters should i choose?
> until now i used hss drills, because my drilling motors would break the
> carbide (especially at freehand use).
>
> i never drilled 0.6mm, does it make sense to buy them? are many component
> legs suited for this?
> do they break too easily or can i work with them (good motor and pivoting
> press)?
>
>
> i will of course buy some 0.8mm and few 1mm too.
>
> so what do you suggest, which drills use you most?
> which diameters can you recommend to buy and in which number?

I use 0.8 and 1.0 mm mostly. I've got a couple of 0.6 mm. They are useful
for small vias.

I use the reground carbide drills, as well as HSS. The carbide ones do break
easily, though.

Leon
--
Leon Heller, G1HSM
leon_heller@...
http://www.geocities.com/leon_heller