Subject: Re: Johnson slot forges. Was: Am I the only one using LPG??

From: [email-masked]
Date: Wed, 11 Sep 1996 17:21:43 -0400

In a message dated 96-09-10 15:42:34 EDT, you write:

>Johnson 'slot' forges

These are high pressure production gas furnaces.  They are used to heat LARGE
numbers of pieces to temperature and use LOTS of gas.  Production forgers
might line up 20 or 30 cut bars in the slot, heat them all to temperature and
forge them all in drop die hammers within a few minutes.  Most of the ones
that I have seen are mounted on long legs, so the slot is at about shoulder
level.  The furnace itself is about three feet high, five to six feet wide
and about three or four feet deep.   They are slowly being replaced by
resistance heaters as they can heat a piece so quickly, and from the inside
out, that scale does not have a chance to form.  
Mike Schermerhorn

---

From: George Ezell <[email-masked]>
Date: Wed, 11 Sep 1996 17:44:02 -0500

> out, that scale does not have a chance to form.

Mike,
	I'd like to know more about these resistance heaters,
and I figure it would fit in with the discussion on new improved
ways of heating metal....something tells me they are out of my
price range, though.
	Thanks!
	George