[Boatanchors] Plexiglass

Nigel Holmes Holmes.Nigel at abc.net.au
Sun Feb 19 19:12:22 EST 2012

Cutting tempered glass is often a recipe for tears. It can shatter during the process or at some indeterminate time after cutting. Best to re-use it in the original piece as annealed/tempered.

73 Nige VK3DZ

-----Original Message-----
From: boatanchors-bounces at puck.nether.net On Behalf Of Wilson Lamb
Sent: Sunday, 19 February 2012 6:24 AM
Subject: Re: [Boatanchors] Plexiglass


The door has a piece of probably tempered glass backed up by a panel of perforated metal with thin plastic laminated on.
This was a classic, old, high end unit, for over the stove use, so a little larger than some.  the glass is 19.25X7.75 inches, so needs cutting if for a standard panel.  I'm guessing a regular glass cutter would do it.  The perforated metal is quite heavy gauge and would make a great viewer for the old rig, as well as let in air.  It's a panel screwed into the door, with the perforations inside the frame part, so you'd have to trim the perforated part out with a saber saw.

I wouldn't be surprised if modern units are a little simpler, but don't know, since I recycled the other five, doors and all.  You can likely break off the door at the hinges, if you don't want to bother going inside.

BTW, of the six HV xfmrs, two are a good match and the rest scatter from 1900-2600V!  You can use the filament winding to buck or boost the voltage by about 2%, if you have a pair that are close.  These are cheap xfmrs, optimized for the oven service, so they draw about 4-5A with no load.  The power factor unloaded is 0.1, so it's not many Watts and doesn't seem to create heat, to speak of..  You have to use two, because one end of the secondaries is grounded and may not be sufficiently insulated to run above ground if lifted.
There's a ref or two I'll provide if anyone wants, or you can search the QST archive for microwave oven.

----- Original Message -----


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