Electronics > Manufacturing & Assembly

Blu-tak used in metal cased PSU assembly?

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Faringdon:
I just had to dis-assemble, and then re-assemble, a power unit with a metal base. This power unit has very low sales volumes.  Screwed to this metal base, were three other internal PSUs (each internal PSU had 4 screw holes for fixing to the base). The screw hole  in the base, was too big, so washers needed to be used. The problem was, when you put the 4 washers round the 4 holes, and then rested the PSU on top of them, it was then the devils own job to screw in the screws without the washers slipping away from the screw hole that they “surrounded”.
I thought of kind of sticking the washers in place with superglue, or even thermal paste. However, these would be messy solutions.
And in fact, blu tak would have been ideal to kind of stick and hold the washers in place whilst I mounted the PSU on top of the washers, and then fiddled about trying to screw the screws up through the holes. Can you think of any problems with blu-tak for this use?.....some of the blu tak would inevitably get stuck in the product and stay there….could blu-tak eventually corrode the metal? The unit gets hot as it’s a PSU…..what  is the max temperature that blu-tak can withstand without catching flame?

If Blu-tak is no good for this, then is there something similar?

Bassman59:
You're kidding, right?

Gyro:
Sadly, Faringdon never kids.

themadhippy:
lick the washer,that should keep it in place long enough

jc101:
If the screw goes into the power supply and is accessible, put the screw through the hole enough so the washers can sit on it.  Hold the screws in place on the outside with Blu-tak until you're ready to do up the screws.  Then remove the Blu-tak as you tighten them up.

I use Blu-Tak quite often to temporarily hold something in place but never leave it behind.

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