I always heat the blades for hardening in the forge, but use the oxy torch to draw the temper - with a bit of practise you can put the hardness exactly where you want it. > Have to say I agree with Tel. The Japanese discovered this when making > Samurai sword blades and use clay to restrict the area that was being > tempered.. > > Andy > ----- Original Message ----- > From: "Terry Lane" <tel@xxxxxxxxxxx> > To: <modeleng@xxxxxxxxxxxxx> > Sent: Sunday, May 01, 2005 6:37 AM > Subject: [modeleng] Re: Any knife makers on the list? > > > > Well now I have to disagree on this a bit. Ideally a knife blade should NOT > be evenly tempered. It should be hard at the edge & get progressively softer > toward the back (spine) of the blade. Also the tang should be considerably > softer than the main blade. This will increase the toughness and durability > of the blade & lessen the tendency for it to snap off first time you try to > dig a witchetty grub outta a black wattle tree trunk. > > > > At what temperature and length of time should it be > > baked in its bed of Sand? > > > > Al > > --- Pendragon <idpriest@xxxxxxxxxxxxxxxx> wrote: > > > Al, > > > > > > It is important to temper the blade in a unifom way, > > > one way this can be > > > achieved is by placing the article in a tray of sand > > > and then heating in = > > > the > > > domestic oven [it follows to do this when Erine is > > > out having some = > > > retail > > > therapy]by heating in this way temperature gradients > > > are avoided thus > > > providing an even temperature.......you could do > > > this whilst cooking the > > > Sunday roast........what is important is to control > > > the rate of > > > heating....'food' for thought perhaps. > > > > > > Regards, IP > > > > > > "Life should NOT be a journey to the grave with the > > > intention of = > > > arriving > > > safely in an attractive and well preserved body, but > > > rather to skid in > > > sideways, Champagne in one hand - strawberries in > > > the other,=20 > > > body thoroughly used up, totally worn out and > > > screaming WOO HOO - What a > > > Ride!"=20 > > > =20 > > > Priest & Sons Model Engineers > > > http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm > > > > > > > > > -----Original Message----- > > > From: modeleng-bounce@xxxxxxxxxxxxx = > > > [mailto:modeleng-bounce@xxxxxxxxxxxxx] > > > On Behalf Of Terry Lane > > > Sent: 30 April 2005 22:04 > > > To: modeleng@xxxxxxxxxxxxx > > > Subject: [modeleng] Re: Any knife makers on the > > > list? > > > > > > > > > I seriously doubt if you could get a good temper in > > > a kitchen oven Al. > > > > > > I generally heat the tang with a torch & watch the > > > colours run. You = > > > could > > > also try laying it in a shallow tray of tallow and > > > burning the tallow = > > > off > > > > > > > If there are, I need some advice. Someone posted > > > on a > > > > list sometime in the past about "Drawing the > > > temper" > > > > of a knife blade after hardening it by baking it > > > in > > > > his wife's Kitchen oven. Problem is, I forgot to > > > make > > > > a note of the temperature or the length of time > > > which > > > > it was baked. Can any of you help out? > > > > > > > > Al Messer > > > > > > > > __________________________________________________ > > > > Do You Yahoo!? > > > > Tired of spam? Yahoo! Mail has the best spam > > > protection around=20 > > > > http://mail.yahoo.com MODEL ENGINEERING DISCUSSION > > > LIST. > > > > > > > > To UNSUBSCRIBE from this list, send a blank email > > > to,=20 > > > > modeleng-request@xxxxxxxxxxxxx with the word > > > "unsubscribe" in the=20 > > > > subject > > > line. > > > > > > > > > > MODEL ENGINEERING DISCUSSION LIST. > > > > > > To UNSUBSCRIBE from this list, send a blank email > > > to,=20 > > > modeleng-request@xxxxxxxxxxxxx with the word > > > "unsubscribe" in the = > > > subject > > > line. > > > > > > --=20 > > > No virus found in this incoming message. > > > Checked by AVG Anti-Virus. > > > Version: 7.0.308 / Virus Database: 266.11.0 - > > > Release Date: 29/04/2005 > > > =20 > > > > > > --=20 > > > No virus found in this outgoing message. > > > Checked by AVG Anti-Virus. > > > Version: 7.0.308 / Virus Database: 266.11.0 - > > > Release Date: 29/04/2005 > > > =20 > > > > > > MODEL ENGINEERING DISCUSSION LIST. > > > > > > To UNSUBSCRIBE from this list, send a blank email > > > to, > > > modeleng-request@xxxxxxxxxxxxx with the word > > > "unsubscribe" in the subject line. > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? 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