On Wed, 2 Jan 2013 07:37:36 -0800 (PST), you wrote:
>Drilling from below presents no problems. I have used the professional version from Megauk, see half way down the page:
><http://www.megauk.com/pcb_drilling_machines.php>
>But at that price, it is out of range of most of the home users. Making one should not preset too many problems.
At that price, it's certainly out of my range.
Let's see (prices in USD), TV camera, 25$, stand (hot air from Weller,
base and arm, 30$, ball bearing slide table (1 axis) 30$, color LCD
display, 10$, Linear drive stepper, 8$, case, 4$, power supply 10$,
Interface board, stepper drive electronics, LCD display for status,
switches, processor board, relays, call it about 30$.
say under 150$, making use of some standard things I had around the
house (128 x 64 graphics display, processor board, stepper motor
driver board). Most of those costs are included.
Oh, and the Proxxon that I use was probably about 100 USD, and well
worth it for the bearings and runout.
Main problem, as I said, was figuring out a good method to hold the
board in place while being drilled.
TV camera with lens is used as magnifier, and the video display is
mounted above that (I think it was surplus from a car DVD player).
Right now the crosshairs are mechanical and on a sheet of plastic,
that might change. If I can dig the sync signals out of the video,
then a simple CPLD will probably be enough for a set of digital
oneshots to make a crosshair generator.
Electronics and some of the mechanical stuff, no problem, vacuum
holddown, still a problem. It's on the "get to it" list. Works with
a foot pedal or pushbutton as you want.
Harvey
>
>Malcolm
>
>
>
>I don't suffer from insanity I enjoy it!
>Mene, mene, tekel, upharsin
>The writing is on the wall.
>
>
>________________________________
> From: Harvey White <madyn@...>
>To: Homebrew_PCBs@yahoogroups.com
>Sent: Wednesday, January 2, 2013 2:29 PM
>Subject: Re: [Homebrew_PCBs] circuit board drilling question
>
>
>
>On Wed, 2 Jan 2013 06:33:41 -0700, you wrote:
>
>>I can see how holding the board down with the drill coming up through it
>>would be a problem.
>
>So can I. The approach was to use a vacuum, but there are mechanical
>problems, as in not enough suction at the moment. I have more
>mechanical work to do. Sadly enough, the microprocessor, drill,
>mechanical work to get it to go up and down properly, all that lovely
>stuff was relatively trivial.
>
>Another option might be a clamping foot or bar. Problem is that it
>would cause some vibration, and that might move the board.
>
>Harvey
>
>>
>>Rick
>>
>>-----Original Message-----
>>From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
>>On Behalf Of Harvey White
>>Sent: Tuesday, January 01, 2013 9:47 PM
>>To: Homebrew_PCBs@yahoogroups.com
>>Subject: Re: [Homebrew_PCBs] circuit board drilling question
>>
>>On Tue, 1 Jan 2013 20:55:39 -0700, you wrote:
>>
>>>Has anyone played with putting a high intensity LED pointing up through
>>>the drill press table so it would be easier to see the circuit board
>>>land before drilling?
>>
>>I've played with a TV camera pointing up (in my case, down) at the PC board
>>with a pair of cross hairs on the monitor. The drill moves upwards. Main
>>problem is a good method to hold the board down.
>>
>>Harvey
>>
>>>
>>>
>>>
>>>Rick
>>>
>>>
>>>
>>>[Non-text portions of this message have been removed]
>>
>>
>>
>>------------------------------------
>>
>>Be sure to visit the group home and check for new Links, Files, and Photos:
>>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>>
>>
>>
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