Toner methode PCB both sides, example

[withoutego]

I have been using the toner methode of creating etch resist on copper PCBs for
many years. Until recently I havn't had consistant results. This is an example of
using the same toner transfer to create the "silkscreen" or assembly on the
component side. The missalignment is visable, ten to fifteen mil. This is related
to making double sided boards, getting the pads to line up within a few mil so
the via holes don't waste copper. The process uses a common toaster oven for
heating the pcb and toner printed paper. A pair of aluminium plates bolted around
the periphery keep the printed circuit paper hard against the PCB. Etching is now
done in feric cloride in a glass pan, rocked by a slow motor and cam. There are
many possible improvements in this but it works well enough for the moment.
Next step is a controlled oven for reflow as well as fusing toner to copper. This
is my first post here. The board is a signal conditioner for a hall based throttle
for a marine electric inboard motor controller. Joe was the customer.

 

[dian]

Thanks for share,
Would you please taking the proses picture to explain more about this

 

[Raza]

Good sharing. Requested to text up the procedure here for the interest of others.

 

[markdem]

I have had issues with home made boards for years too. I think the bets way to do it is to use a laminating machine.
See **broken link removed**. Ignore the model of laminator that guy is using. Just get any from your local shop and make it hotter. Works fine for 2 sided boards too. Just cut two sides of the paper right on the edge of the outside of the artwork and align.

For the paper just use any coated ragwort paper catalogs you get a junk mail. That is the stuff that looks like it is photopaper, but turns to mush when wet. Don't worry if it is printed. The process the printers use will not transfer to you PCB.

Have Fun

 

[Raza]

That is a real good and nice sharing.

 

[milind.a.kulkarni]

Very good shearing .... Can some body will share how the multilayer boards are manufactured.....actually I went to pcb manufacture to see that but they don't allow me to see the multilayer board manufacturing process even.... will be very helpful if some one share that.....

Thanks withoutego for nice sharing