On Thu, 01 Jan 2004 03:33:46 -0000, mikezcnc <
marabu@...> wrote:
> Stefan,
>
> Thank you for such an extensive description of your process. You nailed
> my problems: lousy printer, one iron only and the rest. I clean my board
> with acetone (to remove leftovers and I have always plenty of those,
> don't ask why...), then water with dishwasher soap, tehn sandpaper 600,
> then brillo pad with detergent. Then all is well flushed with water.
>
> Your process is interesting, but it takes s much time toand full
> attention. I am for the idea of Ron Peopeil: set it and forget it. Which
> brings me to another idea: chicken grill, just kidding. I agree with your
> supposition that higher temperature is more forgiving than lower and that
> two high pressure is not good for narrow traces.
>
> I ahve one of those $2 grills for hamburgers but their footpriny is just
> too small.
>
> The problem with iron is that I suspect that temperature is not evenly
> distributeed and therefore it must be set higher to compensate for the
> uneveness. However, that higher (than neccessary temperature -
> someone mentioned 130 being needed for fusing..) causes problems in areas
> with widened lines due to pressure. In other words the correct pressure
> and slightly higher temperature in one area becomes correct pressure and
> incorrect temperature in another, due to a temperature gradient within a
> PCB. My next trial will be a Singer iron press that I picked up from a
> garage sale 2 summers ago for this convenient moment of being able to
> laminate PCBs... Right now I am baking that PCB in an oven after I
> finished pizza and New Year's ham... Mike
>
>
Hi
In some dark corner i should have a iron press, maybe i try that..
to the press ideas:
PCBs are not compeltely flat ask the milling guys.
If you have a flat plate (heated and press it against the pcb
i doubt you get a even distribution of the pressure.
you would need a flexible plate with flexible backing, which again leaves
you
with much harder pressed edges.
I can only speak from experience, my iron seems to be flat, but if i only
press it on flat (without moving around with the curved edge)
there are always areas that don't adhere.
I will measure for you the distribution of the heat in an iron.
But i strongly suspect that there is no more than 2° difference.
(in a solid aluminium iron, not stainless steel sheetmetal coated bottom)
I don't really experience your problems, i get fairly good results
in a wide pressure range (and i suspect also in a wide temp. range)
Stefan