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Some pics of the new oven

Discussion in 'Forges, Ovens, Kilns, & Salt Pots' started by Grouch, Aug 3, 2013.

  1. Grouch

    Grouch Active Member

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    These are a few pics of the oven I just finished [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] The inside dimensions are 20" x 6" x 6" 240V, 2769.2 watts, 11.5 Amps.
     
  2. Mythtaken

    Mythtaken Staff Member CKM Staff

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    Great looking oven, Grouch! How are your results?
     
  3. Grouch

    Grouch Active Member

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    Well I got it to run a small program today so I'm getting there. I am going to try and run it up to stainless temps and time it so I will let you know. I have some blades in ATS34 I need to do so I will try to program for that. I wish it had like a reset button or something so I could just start over when I screw up. lol
     
  4. Grouch

    Grouch Active Member

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    I don't know where the pics went so here they are again [​IMG] [​IMG]oven/ov8.jpg[/IMG][/URL] [​IMG] [​IMG] [​IMG] [​IMG]
     
  5. Grouch

    Grouch Active Member

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    Mythtaken I set it up to ramp to 1049c - 1920f in 40 minutes too see if it would. And then to hold for 60min and then naturally cool. It worked great. I don't know how long it would take to get to that temp on full blast but it was cycling the whole time so probably in 30 min or so. the outside temps were top 57c -134f door 36c 96.8f back 38c -100.4f and the sides were 81-88c. This is my first larger oven so do these numbers sound alright to you?
     
  6. Rob W

    Rob W Active Member

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    was 1920F your max temp reached or is that when you shut er down ?
    cool project, I love seeing the ingenuity of the do-it-you-selfers home projects , impressive and cool all the same
     
  7. Grouch

    Grouch Active Member

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    Hi Rob 1920c is when I programmed it to soak. I am sure it would peak the controller with no problems 2372c is what the controller is rated for. I have it running but I need more experience with it. When I program 1920 at 40 min it cycles so that it takes the 40 min to hit that temp. I'm sure you know more about these than I do but it seems that it uses the info from autotuning to calculate what percentage to run the elements at to accomplish that. If I go to that screen it says its running anywhere from 68 to 74 percent so I don't think 2372 would be a problem. But I dunno!
     
  8. Rob W

    Rob W Active Member

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    looks good , look forward to seeing it work for you !!
     
  9. Mythtaken

    Mythtaken Staff Member CKM Staff

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    The real test will be when you do your first batch of blades. Do you have a hardness tester to check the heat treat?
     
  10. Grouch

    Grouch Active Member

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    I have a Swiss Gehnem R2 portable hand tester I picked up about 6 months ago. Its old (ser# 143) but seems to be very accurate on the test blocks. I will let you know how things work out. I've got lots of acetone and want to pick up some dry ice and try the cryo treat on one as well. And not on the other see how they compare. Got any good recipes for Ats34 plate quench. I found a few online but the Hold time and Temper temperatures are all over the place from one to another.
     
  11. Mythtaken

    Mythtaken Staff Member CKM Staff

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    I think RobW's been doing plate quenching lately. Maybe PM him and see what he's got.

    I'd be interested to see the difference between the cryo and regular quench results.
     
  12. Grouch

    Grouch Active Member

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    I'm not sure how much value my tests will be with my limited experience (none lol) but I have 2 the same that I tried out the grinder with so why not. They are a little rough. I just copied an old EDC folder I use sometimes to a fixed blade style. My EDCs take a beating. I want to get a better way of measuring/ controlling my temper oven before I start. So they both get the same treatment. And I'm sure what I did in case I like it.[​IMG]
     
  13. Grouch

    Grouch Active Member

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    I have some test results from using the oven to do some ats34 blades

    I have been busy with other things for a while and didn't get to it till recently

    I used a recipe I found on the web and it seems to have worked out for me. ( I lowered the temper temp from the recipe on the first temper to adjust the hardness)
    I should not have!

    I read that 60-61 rc was the target hardness for this steel for knives. Please correct me if this is wrong

    Hardness at plate quench rc 64

    After temper at 375 for two hours ( twice) rc 62 ( too hard I thought)

    after temper at 395 for two hours ( once) rc 60.5

    I didn't try cryo on any this time so I can't compare the difference

    I did 4 blades and all of them tested the same

    I have finished up the small blades and they seem to hold an edge quite well at this hardness.
     
  14. FORGE

    FORGE Maker of the Year Best Knife

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    Grouch, I found out that taking some info off the web for heattreating is not always the best idea.
    A number of years ago we did the same thing for ATS steel and found out all of the blades we made rusted. The reason beig we were tempering a way to high a temperature.
    So we contacted Hitachi (the manufactre of ATS ).

    Here is some of their reply and the suggested heat treat information they supplied us.
    Long story short is that you want to believe about 1/2 of the crap that is published on the web.
    [​IMG]

    [​IMG]
     
  15. Rob W

    Rob W Active Member

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    Cal do you know if this is the standard 16-20 min soak at 1850F for say 1/8'' thick and then a temper of 275F for 2 hours 2x ? cool to room temp between tempers

    Rob


    PS - did you come to Kelowna for Christmas ??
     
  16. FORGE

    FORGE Maker of the Year Best Knife

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    I soak for 10 min in salt and only temper once for 2 hours.

    No I never made it to Kelowna. Scared to stay in that new house that is sliding down the hill. I guess there are 5 or 6 of them now that are sliding and of coarse nobody want to take ownership for there
    poor engineering and work, so it is one big mess.
     
  17. Grouch

    Grouch Active Member

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    Thanks Forge
    I find that I like working with this steel and you have probably saved me lot of problems down the road. Would you recommend the same recipe for 154 cm. I understand they are basically the same steel?
     
  18. FORGE

    FORGE Maker of the Year Best Knife

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  19. Rob W

    Rob W Active Member

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    ...that's the problem I think for some of us is crucible says one thing and Hitachi says another , as these steels are suppose to be similar , trial and error seems to be the way to go which is fine by me........
    I know Mr Steve Bates also has another formula for 154cm

    Cal whats your salt pot temp ?
     
  20. Grouch

    Grouch Active Member

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    Here are a couple of pics of the two above finished up a little

    Both are ATS34 @ 60.5 RC hollow ground

    The batch after tempering
    [​IMG]

    And finished up a bit

    [​IMG]

    [​IMG]
     

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