Homebrew PCBs

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-\ufffd 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 \ufffd 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> 
>
>
>[Non-text portions of this message have been removed]
>
>
>
>Be sure to visit the group home and check for new Bookmarks and files:
>http://groups.yahoo.com/group/Homebrew_PCBs
>
>To unsubscribe from this group, send an email to:
>Homebrew_PCBs-unsubscribe@yahoogroups.com
>
> 
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ 
>
>
>