Homebrew_PCBs

> i tried plotting with eagle now.
>
> seems the described precedure works very fine if you simply
> set "mirror"
> and "rotate" at the cam processor window.
>
>
> but i don't get a good output - too complicated in some areas and
> the drill holes are also not plot open.
> PLEASE tell me if anyone has a solution for this.
>
> regards
> stefan

> Stefan,
> Because I use the 'scratch' method, I don't plot the actual traces.
> Instead, I use a custom written ULP from Eagle to generate the HPGL
> output
> for the top and bottom sides of the board. Then I use a program that
> post-processes the HPGL from there and then sends it to the plotter. In
> this
> post-processing program I suck in the drill file and add filled circles
> to
> the middle of each hole so as to etch away the copper in the middle of
> each
> drill hole. So that's the method I use.
>
> *Brian
>
>> i tried plotting with eagle now.
>>
>> seems the described precedure works very fine if you simply set "mirror"
>> and "rotate" at the cam processor window.
>>
>>
>> but i don't get a good output - too complicated in some areas and
>> the drill holes are also not plot open.
>> PLEASE tell me if anyone has a solution for this.
>>
>> regards
>> stefan
>
>
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>

>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?
>
>he has all standard diameters i think and (and also the ones not so
>standard) so it's hard to choose.
>
>
>thanks for any suggestions.

>
> I most often use 0.4, 0.6, 0.8 1 and 1.2 diameters
>
> The 0.4 and 0.6 ones are mostly for vias. So, unless you intend to
> create double or multilayer PCB's those small ones are not needed. It
> of course may also depends on the method of how you do your through
> hole connection.
>
> I don't recomend to buy the circular saw cause there is not too much
> space inside the proxxon saw to create an adapter. I agree that it CAN
> be done, but question is if it's really worth it. The adapter should
> be made of steel and createing one would take ~2 to 3 hours of work. I
> then would prefer to buy a regular blade. Besides, such official
> blades also pop up on e-bay every now and then.
>
> Markus
>
>
>

----- 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

>
> thanks for the drill suggestions.
>
> i rather thought of building the entire saw myself one time...
> the proxxon saw it quite expensive...
>
>
> regards
> stefan
>