Agreed
If the paste separates on dispensing then paste is not optimum. Whacking the
paste on and off under pressure will separate it.
In an Auger or Archimedes screw dispenser the paste should not be under high
pressure. You just need a small positive to keep dispense screw area filled.
The screw then winds the paste out. 


-- 
Regards 
 
Mike 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Thursday, March 24, 2016 4:55 PM
To: [log in to unmask]
Subject: Re: [TN] Auger Driven Dispensers

Ioan,

 Thanks, I did look at their site, they do have a footed valve with an
encoder on the motor. Someday I would like to revisit the paste dispensing
area and I might try one of those. I also saw a valve at APEX with a
pressure sensor right at the tip and the turn monitor. I want one of those!
Auger turning is an important control but you cannot ignore tip pressure. At
high pressure the solder separates from the flux and you end up with a wad
of metal in the tip.  It is a difficult process to control. The "Experts" at
some of the vendors do not always get it right.

Thanks,
Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Thursday, March 24, 2016 9:03 AM
To: [log in to unmask]
Subject: Re: [TN] Auger Driven Dispensers

Bob,

I would also consider http://www.pva.net

They started by building valves, so they have a lot of experience. Have
never used them for solder dispensing, but got very good service for epoxy
dispensing and conformal coating.

Regards,

Ioan Tempea, P. Eng.
Manufacturing Engineer, Satellite Systems 

MacDonald, Dettwiler and Associates Corporation, 21025 Trans-Canada Highway,
Ste-Anne-de-Bellevue, QC, Canada H9X 3R2
Tel: +1-514-457-2150 x3556
www.mdacorporation.com

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-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de Bob Wettermann Envoyé :
Wednesday, March 23, 2016 9:55 AM À : [log in to unmask] Objet : [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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