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Thread: Advice/Recommendations??

  1. #1
    Join Date
    Sep 2009
    Location
    Great Falls, Montana, USA
    Posts
    1,616

    Advice/Recommendations??

    I have an older heat treat oven in my shop. It is essentially a Canadian version of a paragon.

    The story goes like this..... I got it second hand, and after a few uses, I noticed that it kept taking longer and longer to reach temp. For example, if setting the controller to 1950F....it would take 3-3 1/2 hours to reach temp. I thought the element might be going bad, so I ordered a couple of replacements from Paragon.....after installing a new element, the oven now takes 4- 4 1/2 hours to reach the set point. The oven reaches 1000F fairly quickly (an hour or so) but beyond 1000F, it's a crawl. Here are the specs on the oven:

    Cyberblade Furance
    Model: DHT-16
    Volts: 240
    Phase: 1
    Amps: 11.6
    Element: Kanthal A1 alloy
    2800W, 20.6amps, Max temp 2000F



    How long should a heat treat oven take to reach a set point of 1950F? If the time frames I've mentioned are out of line with what should be expected, do you have any advice or recommendations?

    Many Thanks!

    www.caffreyknives.net
    Caffreyknives@Gmail.com

    "Nobody cares what you know.....until they know you care."
    Visit me at Table 2R at the Blade Show!

  2. #2
    What are the ohms on the element you have in the oven? The calculations for the watts per square inch of internal surface area ( like horsepower to weight ratio for car) shows that unit should be a rocket to 2000F. I assume it is a single element in the oven?

    If you have one that is not appropriate, we can usually design elements to operate at a faster heating rate. If you are going at a FULL rate or as fast as the oven can go, usually 2 hours to 1950F is reasonable. You have 240 volts so not have that as a limitation. If you want to e-mail me directly off line, I can build you an element that will have that oven running much faster. hohenshelt@att.net

    Thank you

    John

  3. #3
    Join Date
    Sep 2009
    Location
    Great Falls, Montana, USA
    Posts
    1,616
    Thanks John!

    I'll email you with all the specifics

    www.caffreyknives.net
    Caffreyknives@Gmail.com

    "Nobody cares what you know.....until they know you care."
    Visit me at Table 2R at the Blade Show!

  4. #4
    Join Date
    Dec 2010
    Location
    Valparaiso, IN
    Posts
    1,248
    Dang... I built an oven from scratch that has very similar specs (altough I don't know about interior volume), and it probably only takes 20-30 minutes to get up to 1500F. I can't imagine it'd take MUCH longer than that to hit 1950. Maybe an hour TOPS.

    Are you sure you're getting 240V across the element?
    -Andrew

    For the word of God is living and active and sharper than any two-edged sword.... (Hebrews 4:12)

    My YouTube Channel: www.YouTube.com/ARCustomKnives
    Check it out and Subscribe!

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