I've got this Starret cast iron square kicking around.

Not sure, think i have the same one though.

reverse electrolysis.

>>1181898

soap & water & scouring pad for the square head until the any loose flakes of paint come off
wire wheel for the scale

i have an old craftsman that i use every day

>>1181898
overhand straight in to the trash.

I found a 4 piece version with a 12 inch rule for $5 at a garage sale.

I pretty good shape too

>>1183188
starrett? mitutoyo?

>>1181898
>cast iron square
The rule is steel as in tool steel.
Show a pic of a magnet stuck to the 'cast iron' frame.

>>1181898

>2 14/16

This is why imperial gets made fun of, OP. And I'd use steel wool if all it is is surface rust.

>>1183490
Each edge of the 'ruler' is in different fractions. 4ths, 8ths, 16ths, and, 32nds is standard. Or it could be 8ths and 16ths on one side and 8th and 16ths on the other, but going in the other direction, on the other. Either way, you wouldn't put 7/8ths on the the 16ths side. It would be like having 10 MM on the side of a rule that is only in CM.

Evaporust is worth having around the shop, but a red Scotchbrite pad and WD-40 (to wash away the corrosion) works well and many machine tool restorers do it that way too.

Rust removal is worth your time to learn since you'll do quite a bit of it as a DIYer.

Ignore the trolls who don't use tools seriously. You probably should hang out on home shop machinist and woodworking forums since /diy/ will always be shitty, and you'll learn a lot doing so.

File: 1373603966489.jpg (63KB, 500x446px) Image search: [Google]

63KB, 500x446px

>>1183462
>iron doesn't attract a magnet
>but steel does

>>1181898 boi

>>1181898
Acid bath.
Vinegar works well.
Soak for an hour at a time and check, no more.
Scrub with a blue or pink scotchbrite pad, NOT BLUE.

This is common for bmx restoration.
Other processes ITT will leave it scratched.

>>1183688
>Scrub with a blue or pink scotchbrite pad, NOT BLUE.

Incoming wounded. All operating personnel report to tent four, repeat, four-- I mean five! Repeat, four.

>>1183690

kek

>>1183541
Cast iron is just steel with more carbon.