Welcome to the Kellogg & Sons Blacksmith Shop

Our traditional Blacksmith shop located in Northern New York. We do custom Blacksmithing work focused upon traditional 18th and 19th century hardware and tools.

Thursday, February 17, 2011

Blacksmiths' method to Harden and Temper a Spring.

On vacation lately I've gotten to work with some other Blacksmiths.  One of them is Eric Schatzel, a smith of no small skill at traditional work.  One recent project he did was to harden and temper a spring using traditional Blacksmithing methods of heating in the forge and oil quenching.

This is an existing spring that was tempered too soft.  First it was carefully heated to non-magnetic in the coal fire and then quenched in oil.  That is vegetable oil.

Then it was degreased and carefully heated to draw a "Robin's egg blue" spring temper.  I've also heard a Southern smith call this "Possum ear blue"!  In any case it is probably around 630 degrees to impart a good spring temper.

Next a spring vice is used to re-install it.

The spring is now in place.  Light oil is added everywhere it touches other steel to prevent it from binding on a burr.  By the time the oil evaporates it will have worn in.

There it is!

No comments:

Post a Comment