Inge,

Just double-check to assure that time vs pressure gives you the consistency
that you desire.  Fortunately, is easy to adapt to the end of robot arm.

How will robot control the dispense 'height'? 


Only recently has weather broken to temperatures greater than ~bone-chilling
cold.  Now the lack of disposable income is an issue...  Always something to
spoil the party!

Steve

-----Original Message-----
From: Inge [mailto:[log in to unmask]] 
Sent: Monday, February 09, 2009 4:47 PM
To: TechNet E-Mail Forum; Steven Creswick
Subject: Re: [TN] robotic dispensing

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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