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I don't have one of these tabletops, but I had a thought. A cell phone has a polarizing filter. Would that also show the effect? [email protected]> wrote:

It isn't absolutely necessary to use two polarizers, if you have a pair of polarizing sunglasses.? Indirect light from the sky on a clear day is partially polarized, so just put them on and look at

Dear Roy, Many thanks for the Maltese pattern detection method for tempered glass. Regards, David (nr. Oxford, UK)

Aluminum will react with a strong base, ferrous metals won't. Probably the easiest to obtain is a drain cleaner; the kind you want will contain either sodium or potassium hydroxide. You'll probably

If you have concentrated nitric acid, that won't harm aluminum but will attack most other metals, including magnesium. Also, shaving of magnesium will burn brilliantly. (That's how they made

Perhaps Archimedes could assist.

There are some chemical ways to test aluminum but require strong chemicals.? Calculating the density is a much safer way to go.

I assume by from a picnic table you mean it is a frame or part of a frame. If it looks like a cast part, then if it is magnetic, it is not aluminum. If it isn't magnetic, it could be aluminum or

Not sure if it is a shape you could figure out its volume. If it is you could weigh it and see if that is the correct for that volume of material. Paul M

I have? some? metal? from? picnic table? whit glass 2 interrogation A? howto? verify? it is alluminium? ?maybe? magnnetic? ok? but? do you have? any other? method? like? acid?

I verify on the box it is mark 50 amp it look to me a bit to hight but that is 500w around the ok jack 47 71 nb the first messge said server was bad configured ??

It's not just the lower melting temperature; the cadmium makes the liquid flow better. Roy

Good find! The picture is better than my text ;-) Roy

??? interesting , whats the power source ? ??? thanks animal

I used sil-phos in refrigeration. Doesn't need flux, prepping is minimal, stands up to relatively high pressures; Needs higher temps though.

here the photo of my special carbone welder the black part are insulated and the 2 part can be move to touch or a bit distenced for plasma building jack 47 71

I've turned brass fitting many times on the LMS 5100.? ?Never went to specific bit geometries - just used the indexable carbides from low-priced sets or other chinese turning tools. -- Lone Tree,

I ALWAYS use cadmium-bearing alloys because of their lower melting temperature. I keep a window open in my basement shop and a fan blowing from one side so any fumes get diluted and blown away from

It might not be clear to everybody what "stoning a tiny flat" really means.? This is called "dubbing" a drill and here is a pretty good photo I found online. It isn't really a less sharp edge (you

The main things are no top rake & stoning a tiny flat (instead of a sharp edge) on drill bits.? Those sharpening differences keep the tool from pulling itself into the work. Roy