Steven,
after a very short considering your words: a air pressure dispenser it will 
be.
Was in a hurry, will meet the robotic guys tomorrow. Need the machine next 
week (working!)
Thanks again, Trikeman, on the wings again soon?
Inge

----- Original Message ----- 
From: "Steven Creswick" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 09, 2009 10:18 PM
Subject: Re: [TN] robotic dispensing


> Ingemar,
>
> In my mind the decision for air vs screw [air time-pressure vs positive
> displacement] is made on the basis of just how much volumetric control you
> require [and the characteristics of the material].
>
> If the RT time vs viscosity characteristics of the material allow you to 
> go
> with a simple time/pressure arrangement, then all you need to hang on the
> end of your robot arm is a syringe and needle.  Cleanup is a snap.
>
> I hate cleaning the screw/auger systems!!!  Things get even more 
> complicated
> with short pot-life materials.
>
> It always seems like someone in production 'forgets' to clean the system
> before leaving for the weekend ... leading to cost and delay issues the
> following Monday.
>
> I would certainly try an experiment with time vs pressure first.  If that
> doesn't work, well there are other positive displacement systems that are
> less cumbersome than the screws.  Asymtek and others for example [$]
>
> Did I say that I like the old time vs pressure approach if I can get away
> with it??  :-)
>
> Best wishes
>
> Steve
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
> Sent: Monday, February 09, 2009 3:54 PM
> To: [log in to unmask]
> Subject: [TN] robotic dispensing
>
> Hi all,
> have to buy or lease a 6axis robot for dispensing UV cured conductive 
> epoxy
> in thousands of small tubes or channels. Strings 0.5 mm wide and 20 mm 
> long.
>
> Only the dispenser tip can enter, the rest of the dispenser must stay
> outside the target. Speed is of no interest, quality the more. It's a very
> small one,  only 500 pounds of weight and max payload 10 pounds. All DC
> motors, no hydraulics. Position accuracy is 50 micrometers.
> Q: anyone with opinion what is best, pressurized air piston or screw? Are
> there dispensers for easy robotic hand mount?
> Inge
>
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