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Subject: Re: [Homebrew_PCBs] Re: cnc solder paste - software

From: Stefan Trethan <stefan_trethan@...>
Date: 2004-04-28

>
> This is correct. I had mentioned that earlier on the thread. It
> would not be a horrbily difficult matter for a programmer to read the
> NCDrill file and/or the Gerbers and 'remember' the last amount of
> paste in the tube and then output a G-code file to make that all
> happen.
>
> I'm thinking we need to get a member who is fluent in programming to
> add that piece to the puzzle.

I could do simple file editing, converting, i have done this before with
java and c.
Would need to look up on graphic user interface, maybe someone wants
to do that. I would use a text interface for now.

>
> But, you are correct that you would need to have parameters like
> paste volume per pad would need to be a manual setting, preferrably
> one that is a manual potentiomer so you can do it on the fly.

A manual potentiometer would be one solution, i am not sure at all how
one could integrate the "4th axis" of the syringe motor in the G-code.
If one uses a pneumatic system the "potentiometer" would simply be the
pressure regulator.

>
> depth can be a screw stop or a software setting, depending on the Z
> feed style. Some are leadscrew, some are solenoid.

I'd opt for a leadscrew type, as i want to enable drilling.
I think of a "gantry style" machine.


> And you are correct on speed. there needs to be some hang time at
> the spot to allow the paste to dispense.

Yes, i do not think this is possible with a drill cycle at all, is it?
but i would assume one can make a own "paste cycle", like a macro
or what it is called (need to read up on that).

ST