--- In
Homebrew_PCBs@yahoogroups.com, "Harvey McRae" <hlmcrae@...> wrote:
>
> !!!!!!!!If I needed 20 boards I think I'd seriously consider looking at a commercial offering.!!!!!!!!!!
>
> I'm putting on a little clinic on etching boards for our model railroad group. Although I have been aware of having to put on this clinic for two months, I dilly dalied around until last night when I am scheduled to do this clinic on this coming wednesday night...
>
> Further to this, I am making up a little parts bag, and each person will etch his own board.....(I have pre-drilled the holes) then each one puts the parts together solders them in place, and hopefully after a couple of evenings working as a group, each member will go home with a "working" model of a dual flashing light.
>
> Pray for me for Wednesday night, that all goes well.. This is the first clinic I have done on this subject.
>
>
>
> Harvey L. McRae
> 838 McKenzie Rd.,
> Kelowna, B.C. V1X2B3
>
> Web: www.harriscreekcentral.webs.com
>
>
> ----- Original Message -----
> From: sailingto
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Sunday, May 09, 2010 6:02 PM
> Subject: [Homebrew_PCBs] Re: Best Way to Cut PCB
>
>
>
> Harvey, you are correct - the PCB section that is cut off does not do well at all, unless it's pretty large - couple of inches maybe?
>
> Most all my boards are at least 1" to 3" in width, and that tends to cut off pretty good, but cutting a thin slice will just curl.
>
> If I had to do 15 or 20 boards I think I might opt for a table saw myself - being sure to use a very fine tooth carbide blade.
>
> In the PCB cutoff thread last week there was a really nice looking tiny table saw using diamond blade that looked like it'd do the trick.... If I needed 20 boards I think I'd seriously consider looking at a commercial offering.
>
> Ken H>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
My clinic went over big time. 8 members out of ten present.
I prepared the boards, predrilled the holes, plus marked the lines with the Markers for etching resist.
Etching solution was prepared in little baby food jars, so basically three people could etch their board in the same little jar. (Preheated to warm to the touch) Every board turned out excellent. The components were handed out, and a careful eye watched to make sure all the little legs got stuck in the right holes. After all components were in place we called it quits for the night but each one took home a homework project to solder the items in place.
Once complete, each member will have a dual flashing unit for things like a police car, ambulance, fire truck etc..
Here is just one of my comments recieved from one member:
Good morning Harvey.
Thanks for a great study! I always thought that a special kind of varnish is needed to protect the copper from being eaten away by the acid. A simple felt marker makes the whole process a lot easier.
So all in all we had an excellent group reaction.