Screwdriver
Member
- Messages
- 10,150
Wait what?? There's a F and a H!
Who knew...
Who knew...
Well there you go school metal work class was full of innacuracies in the 1980sYou're more likely to get cancer to be honest...
Old engine oil is one of the worst products you can do anything with. Getting it on your skin is bad enough, getting it into your lungs: well, good luck with that!
Martensite is a phase state for hardenable (typically high carbon) steel. It is generally above red hot before steels enter that phase before you "quench" the material (often in oil depending on the grade) which locks in or freezes the crystalline structure. It is not a surface only process, case hardening is something else.
You can brush oil (or ideally wax) onto hot steel to give you a robust coating but not red hot and it's not martensite.
Well there you go school metal work class was full of innacuracies in the 1980s
But it was definitely above red hot
I think we had whale oil for hardening at school, slower quench to reduce cracking from memory.
If you were at school in the 1850's I guess you could though it might have been a tad risky even then - what with it being highly flammable!
The only time I have ever seen any was a tiny vial supplied with new Sony Betacam high end professional broadcast machinery back in the early 1990's. It was ferociously expensive!
I was told that oil was also used due to it not steaming & bubbling as water does, so it provides consistent cooling across the full surface. Pretty much related to what Wallace suggested, as in it potentially prevents cracking, distortion etc.
Had a look at the dark oil the Toolroom use for heat treatment and asked what it was, whale oil!
Loving the address!
I'm having a dumb moment?
Unless it's been there for 50 years, no it isn't.
If it's more recent, it's not only illegal, even without the fines it would be cheaper to use a bucket of caviar.
Ah.... but I'm sure there's a sticker somewhere on the BMW which says "Munich"
That block looks great. Why are we blessed with suxs small boring engine's here