A simple question

[Dalboy]

Can any one of you metal workers tell me how accurate THIS basic guide is

 

[RogerP]

Very, but it does need a bit of experience so it's a good idea to try out a few known metals first.

 

[Monkey Mark]

Interesting reading. One to bookmark I think.

 

[AES]

+1 on the above. Lacking anything else, it's a pretty standard method (e.g. it's in the "Model Engineer's Handbook" by Tubal Cain), but also +1 on the point about testing some known stuff first to get a good idea of how different those sparks really look.

AES