The experience with paste dispensing is very supplier dependent. Your
potential successful supplier base (successful paste/dispenser pairs) is
much reduced compared to stencilling. You may have to change supplier for
dispense compared to print. Ask the equipment vendor what they demo with.

-- 
Regards 
 
Mike 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Wednesday, March 23, 2016 3:02 PM
To: [log in to unmask]
Subject: Re: [TN] Auger Driven Dispensers

Hi,

 I spent some time with valves and dispensing, I wasted a lot of money ($7K)
for a SuperDuper valve from Nordson EFD. It was years ago and I am still
ticked.

A lot depends on what you are trying to dispense, I was playing with solder
paste, terrible stuff to force through a needle. Having a shaft encoder on
the motor or using a stepper motor to drive the auger along with a pressure
sensor in the tip is important. Control of the motor speed along with X,Y
drive controls is important, as you move faster the auger turns faster but
there are limits to how fast you can turn before the tip pressure forces
material to back flow in the auger. You need to know what is flowing out the
tip so you can deposit consistent line regardless of X,Y speed.

Distance from the tip to the surface is important. At most dispensing demos
you see at APEC or anywhere else you see them dispensing on glass, what a
scam. Real surfaces, like a PCB, are anything but flat. So you start to
consider adding a surface height monitor to your Z control loop to metail
the correct tip to surface distance.

Bob K.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Wettermann
Sent: Wednesday, March 23, 2016 9:55 AM
To: [log in to unmask]
Subject: [TN] Auger Driven Dispensers

Gents/Ladies:

We are looking at putting a non-pneumatic drive dispenser on a robot. Due to
some pretty fine dots, the need for speed and for consistency and the need
for some lines to be dispensed, we are looking at an auger-driven system
(5-6 mil dots).

Does anyone have favorite vendors of the dispensing pumps and controllers
that can be added on to a pieces of automation equipment?

Regards


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Bob Wettermann
BEST Inc
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Cell: 847-767-5745

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