i thought of manual drill press, moving the pcb with your hand.
i know there are such devices sold especially for this task and they are qite expensive.
but i'm sure it is possible to get a drill press working properly without these special bearings.
if you limit the minimum diameter to 0,8 or 0,6 millimeter.
i was wondering how the guys here do the drilling which don't hava a x/y drill cnc machine.
regards
stefan
19.05.2003 00:56:25,
JanRwl@... wrote:
>In a message dated 5/18/2003 9:32:17 AM Central Standard Time,
>stefan_trethan@... writes:
>
>> any new and nice ideas are very welcome.
>>
>>
>> have all of you professional pcb drill presses or how do you drill your
>> boards? (maybe homebuilt ones and a picture of them???)
>>
>> regrinding drill bits (for pcb) should be possible with a small diamond
>> wheel? is this true / is this possible &good for one who can regrind a
>> normal drill bit so that it works again?
>
>Stephan:
>
>To your first question: WOW, you would be talking close to $100,000 (U.S.!)
>for a "professional PCB drill press", I think! At least the one CNC 4-quill
>job I saw in operation at a local PCB shop. Now, if you mean just a manual
>drill-press one could use to MANUALLY drill a prototype board, I have never
>seen one with an adequate-quality quill. The quill-bearings would have to be
>at least ABEC-7 for that! I bought ONE such bearing to rebuild a tiny 400
>Hz/3-Ø motor I used to MAKE a PCB-drill, and WOW, talk about PRICEY! The
>precision and concentricity of a quill must be MIND-BOGGLINGLY close to give
>ANY life at all to PCB-drills! And the "attack" and feed-rate must be
>properly set, as well.
>
>Yes, PCB drills ARE re-sharpened with small diamond wheels, but again, you
>are talking about some very fine drill-bit tipping equipment, NOT just the
>diamond-wheel! The results you can get from manually touching a tip to a
>diamond-wheel on a small "grinder motor" will vary so wildly you will wonder
>if any "sharpening" is taking place, at all!
>
>Now, the frustration of the first ¶ above inspired ME to brew my OWN "PCB
>Drill", and control that with a now-LONG-discontinued CBM "PET" computer (see
>photo). But I did that in '84! Were I to do another (or rebuild that one,
>when it finally fails, which may be soon! Argh!), I would design the
>"electronics" to work with a "PC", as those can be had now for less than the
>postage necessary to GET them delivered to the door!
>
>So look at the photo: <A HREF="http://photos.groups.yahoo.com/group/cad_cam_edm_dro/vwp?.dir=/Home-
brew+CNC+lathe&.src=gr&.dnm=PET-Controlled+X-Y+PCB-Drill.jpg&.view=t&.done=http%
3a//photos.groups.yahoo.com/group/cad_cam_edm_dro/lst%3f%26.dir=/Home-brew%2bCNC%2blathe%26.src=gr%
26.view=t">PET-Controlled X-Y PCB-Drill</A>
>
>
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