I've played with this with standard transparency film and a little 40w Chinese
laser- takes a bit of tuning to get it all correct but works. Stencils are
really cheap when you order a board if you remember.
Regards,
John M. Wettroth
E: j...@mindspring.com
M: (919) 349-9875
H: (984) 329-5420
--
About 10 years ago OSH Stencils started out selling stencils made of
kapton. The kapton came on rolls and there was curvature in the stencils
such that 80% of the hassle of applying paste was holding the stencil
down as flat as possible. For fine pitch parts it was a serious PITA. I
was told ka
I think everyone experiments with SMT assembly to get to something that works.
I used a little Chinese clone pneumatic dispenser that pushed out paste through
a blunt needle- its fine for small board if you can pull an airline into your
lab. The only designator is 983A, it must be a copy of so
Wow, John. It never occurred to me to turn solder paste into "solder
paint"! Does that really work for you for .5mm centered QFNs?
Pete
On 6/4/23 14:01, John Wettroth wrote:
I think everyone experiments with SMT assembly to get to something that works.
I used a little Chinese clone pneumati
I do SMT boards all the time. I order PCBs with stainless stencils from
JLCPCB, www.jlcpcb.com. I normally order 4-6 layer double sided boards. 10
boards with two stencils are around $50. Then shipping to US is $50. I
normally get boards in about 7-10 days
I use a stencil printer from NeoDen, then
Don't go overboard- you want thin mayonnaise or mustard, if it's like peanut
butter or worse, its on its way out- IPA works good. You have nothing to lose.
Any room temp polar solvent will work-Acetone, methanol, DMSO. No Xylene,
Toluene or Naptha- non polar petroleum distillates are trouble
Thanks Trampas- I experimented a lot over the years too but have slowed down
somewhat in my dotage. I worked for Maxim from NC and went out west monthly-
they had the real stuff ++ but monthly was too long. I was hacking around
mostly with RF stuff done on an LPKF CNC board grinder which I sti
RF is a different beast, not sure a stencil would help in such applications.
On Sun, Jun 4, 2023, 7:30 PM John Wettroth wrote:
> Thanks Trampas- I experimented a lot over the years too but have slowed
> down somewhat in my dotage. I worked for Maxim from NC and went out west
> monthly- they h
