Do you have a picture you could share of this smd needle pickup doohicky?
It doesn't have a vacuum break valve on it?
----- Original Message -----
From: Alexandre Guimarces <alexg@IIS.COM.BR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, January 05, 2002 7:07 AM
Subject: Re: [EE:] homemade CNC pick and place


> Hi,
>
> > You are a legend Alexandre. :o) I have an aquarium
> > air pump and some needles I bought to use with
> > the solder paste syringe. Are these the right
> > type? So you just use the metal tube needle,
> > filed flat on its end, as the bit that touches
> > the SMD? I thought it had to be rubber or something
> > but your way sounds very easy to make. The aquarium
> > pump hose will match up to my vacuum solenoid too,
> > same size rubber hose.
>
>     Hey, you make me blush :-) These crazy ideas is what I always liked
the
> most about the piclist.. We are not afraid of doing it in some different
> way.
>
>     The parts are so small and the vacuum so little that you will never
hurt
> the parts not using rubber. Your description is perfect. Just file flat
the
> needle. If you make the vacuum small enough the parts will fall off the
> needle as soon as they touch the solder paste !!! Works so good that you
> might want to forget about the automatic pick and place alltogether :-(
> Please don't.......
>
> > Ok, I understand now. With regulated pressure and
> > controlled time you can get fairly exact quantity
> > of paste dispensed. But is this suitable for the
> > repeated tiny paste spots needed to use 0805 SMD
> > parts?? And does the consistency of the solder
> > paste change over time and cause problems with
> > dispensing an accurate spot each time?
>
>     You can have more than 30% errors without any trouble at all. Just
make
> the pads for the components bigger than the ones your software tells you.
> The consistency do change with temperature, pressure and number of
> repetitions but not enough to cause problems.
>
> > Will do. :o) But i'm hoping that people aren't
> > objecting too much to this SMD CNC topic? I would
> > think there must be a lot of us doing small
> > quantity manufacturing that would like a cheap
> > SMD pick and place machine.
>
>     I am curious of how many people actually have this kind of problem...
I
> always fell that we are a group that basically has the hobbyist, the
> independent consultors and the guys with the big companies that can spend
> lots of money on equipament. Maybe I am wrong. If no one objects I guess
if
> on topic enough for the [EE:] tag. At least we do not have any cows
involved
> yet :-)
>
> Best regards,
> Alexandre Guimaraes
>
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