RE: [CAD_CAM_EDM_DRO] automated "labjack"

All the commercial ones just lower a syringe down onto the PCB mounted on
the main head, then either apply a little air pressure, or screw a ram down.

On my machine I have full height control of the nozzle, and pulse and
pressure at the end.

This allows it to move down to the PCB, and sort of jab a blob onto it, they
can also use it to open a pressure button nozzle like you have on plastic
injection moulders.

If you move the PCB up, PCB's are firmly held down, so it may pop off the
registration pins.



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Graham Stabler
Sent: 28 March 2007 11:47
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] automated "labjack"




I've been thinking about an idea related to solder/adhesive dispensing
on PCBs. The idea requires a short stroke z-axis but it would be much
better if it the PCB itself could be lifted rather than moving the
head up and down for various reasons.

Lets say you want to move a pcb up and down by about 3mm or so and
quickly making sure that it all moves by the same amount. Is
something like a lab jack the best bet or is there something cleverer?

Graham





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