Jinx,


Sounds like a through glass keyboard???

1.    You didn't say whether you are allowed a wire etc from the unit to eg
power supply (it may have inbuilt ;t power supply).
If a wire is allowed then you COULD use an airpump to provide suction.
Fishtank airpumps sell for around $NZ15 and have all the suck you need.
They can be set for variable power (usually blow). While they are usually a
bit noisy at full power they are reasonably quiet at lower powers. Power is
adjusted by changing armature travel on a  vibrator AFAIR,

2.    You could GLUE it to the window with cyanoacrylate glues.
These work quite well and the mess can (probably :-)) be cleaned off the
window afterwards. I haven't checked for long term etching etc but Loctite
have heaps of info on their site. Cyanoacrylates will NOT bond to alkaline
substrates (such as glass) forever but WILL do it for a very long time.
You'd have to check to see how they matched your need. Removal is easy
enough. Due to the inflexible nature of the adhesive, levering the joint
from the side places large stress and fails the adhesive progressively
whereas normal application of force across the whole joint results in a VERY
strong bond.




      Russell McMahon
_____________________________

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-----Original Message-----
From: Jinx <joecolquitt@clear.net.nz>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Thursday, 24 February 2000 14:12
Subject: [OT] How stuck is that PICcy in the window ?


>(dreadfully limp pun)
>
>Hi, I need to mount an electronic display smack in the middle of a
>window. It weighs 240g, consisting of a PIC, PCB, thin plastic case,
>LEDs, bits and pieces of label etc etc. Measures 8" x 8" x 1/2 "
>The window is standard plate glass. The unit has to be fairly easily
>removable at any time, possibly by a ham-fisted counter-minder.
>
>Double-sided tape -- 4 pieces 10mm x 20mm, works OK, but I can't
>put too much more on or it'll look ugly, and I think the heat of the sun
>will get to it eventually
>
>Suckers -- 4 small (22mm), they're OK, but they'll dry up. These are
>wettable types, not bulb-pump. Are bulb-pump better ?
>
>One option I thought of is to suspend the unit from the top of the frame
>with thin black thread, to take the weight, and the sticking device just
>holds the unit to the glass (it HAS to be held), but aside from that no
>other attachment to the window is viable. Does anyone have ideas,
>especially any fluid that could be used with the suckers that's more or
>less permanent, like glycerine for example, or some other slow or non-
>evaporating liquid.
>
>TIA
>