Re: [softrock40] Re: PCB-vise
- roger.shultz wrote:
>This along the lines I'm thinking, except I can use threaded shafts
> --- In firstname.lastname@example.org <mailto:softrock40%40yahoogroups.com>,
> Roger Hayter <roger@...> wrote:
> > In message <498105B6.6010706@...>, Sid Boyce
> > <sboyce@...> writes
> > >Sam Morgan wrote:
> > >>
> > >>
> > >> R R Robson wrote:
> > >> > I have used it and my only issue is that it is not very good
> for boards
> > >> > that do not provide much "empty" space at the edges of the
> board to
> > >> > allow the thumb screws on the vise to clamp firmly to the
> board. As far
> > >> > as I can tell, you will need nearly 0.25" of "clear" space to
> > >> > accommodate the clamp. Alas, most of Tony's boards either
> have fragile
> > >> > traces or intruding components everywhere I try to clamp that
> > >> >
> > >> > For boards that provide the realestate, it is a super little
> > >> >
> > >> agreed, I found I built most of my Softrock in a metal pan on
> the desktop,
> > >> However I did use the PCB-vise for 98% of my builds of a
> different kit.
> > >> That board was so large that I needed to rest some of its mass
> on a support
> > >> (plastic coffee can) as the weight/size of the board over
> powered the
> > >> PCB-vice.
> > >> In fact I liked it so much I bought a 2nd one for my next build
> > >> larger boards.
> > >>
> > >> --
> > >> GB & 73
> > >> KA5OAI
> > >> Sam Morgan
> > >> Linux, the lifetime learning experience.
> > >>
> > >
> My solution to the circuit board holding problem was to cut a block
> of wood, mark the hole centers from the board on it. I then drove 4
> nails into the wooden board and cut them off flush. I aligned the
> nails so that the circuit board could easily slip over the nails then
> added spacers so that components would clear the wood. Now I can flip
> the board over easily and it is held solidly in place while I solder.
> The wooden block is double stick taped to the inside of the rimmed
> aluminum cookie sheet I am using.
> This is my first attempt at SMT kits and I'm learning as I go. One
> tip was that I found a needle pointed 15 watt solder iron at Radio
> Shack and what helped most was the .015 2% silver solder also
> available at Radio Shack. This makes nice joints and will probably
> make bridges harder to occur.
> I've got a long way to go to finish but my connections now look
> professional and neat as a result.
with screws, copper sheet top and bottom of the wood and the copper
grounded as a precaution against ESD and the whole lot sitting on one of
3 very large antistatic mats I have around. I even go further and use a
wrist strap that's monitored by a "Ground Gard" as a dirty wrist strap
or one that isn't in good contact with the skin also is an ESD risk. I
was lucky as my then boss allowed me to spend $10,000.00 US to equip all
our UK engineers with Ground Gards - they bleep at you if ever the strap
isn't properly in contact with the skin, built-in self checking to make
sure proper operation. Overkill for the SR kits we build, but a must for
the $1/4m boards we handled and the CPU uptimes our customers expected.
It was nice to pass the buck back to manufacturing when they once
accused us of causing the damage in the field and subsequently filing a
report on the slack practices outside of their frequent ESD audit days -
guys wearing antistatic coats then walking around holding boards
unprotected. Under a microscope you could see the huge crater they caused.
73 ... Sid.
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks