Homebrew PCBs

Harvey,

The problem I have with my present arrangement is parallax. I have the end
of my drill about 0.01" above the board and I am able to sight down at about
a 45° angle. 

I also need to be able to see a few inches around the hole at the same time
so I can move to the next hole. 

Rick



-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Harvey White
Sent: Tuesday, February 12, 2013 8:22 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Re: circuit board drilling question

On Tue, 12 Feb 2013 04:57:56 -0700, you wrote:

>Dennis,
>
>I have not tried the plastic yet but suspect you are right. It might also
trap shavings. But I am shooting for a simple solution and lasers may be
taking me in the wrong direction.
>
>I wonder if a small pointer that retracts out of the way as the drill feeds
down might be made simply....

How about:

1) a BB gun or pellet gun (project dot at infinity) type of sight.

2) an angled mirror that lets the sight be horizontal rather than vertical.

Not the most elegant of mechanisms, but perhaps the same mechanism that's
used on telescopes to provide a 1x sight (google TELRAD sight) might work.

very little optics involved, I think

Harvey

>
>Rick
>
>On Feb 11, 2013, at 3:04 PM, "dennis.lewis5" <dennis.lewis5@...>
wrote:
>
>> I would think the plastic might be distracting since it would be like
looking into a mirror. Maybe two line lasers set up to provide a crosshair
target?
>> 
>> --- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber"  wrote:
>>> 
>>> Dennis,
>>> 
>>> I can do OK with just top light and about 0.01" of clearance between 
>>> board and drill during positioning. But it would take less 
>>> concentration if I added a means of locating the touchdown point. 
>>> Maybe a thin clear plastic plate would do the trick. I would just 
>>> attach an L shaped piece and then let the drill make the hole so it
would be self aligning. Hmmm.
>>> 
>>> Rick
>>> 
>>> -----Original Message-----
>>> From: Homebrew_PCBs@yahoogroups.com 
>>> [mailto:Homebrew_PCBs@yahoogroups.com]
>>> On Behalf Of dennis.lewis5
>>> Sent: Saturday, February 09, 2013 2:50 PM
>>> To: Homebrew_PCBs@yahoogroups.com
>>> Subject: [Homebrew_PCBs] Re: circuit board drilling question
>>> 
>>> Rick,
>>> Recently I did this. I cannot tell you that it was a terrific
improvement.
>>> In my arrangement there are overhead lamps as well as the one below 
>>> the deck. I am still experimenting but this probably would have 
>>> worked better if the overhead lamps were dimmed a little more and 
>>> the copper was not as reflective, maybe cleaning the board before
drilling isn't the way to do it.
>>> 
>>> The led I used was not specified, just claimed to be super bright 
>>> white, 4.5v. I am running it at about 30ma., as much as I dare.
>>> 
>>> 
>>> --- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber"  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?
>>>> 
>>>> 
>>>> 
>>>> 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
>> 
>> 
>> 
>> 
>> ------------------------------------
>> 
>> 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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