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Thread: Oven observation today.

  1. #1
    Boolit Master Drew P's Avatar
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    Oven observation today.

    So I have been using an apartment sized electric range oven in my shop for duties such as coatings. It's been a great tool! I love having burners and oven. But I was always a little suspicious of the temp accuracy. So today I drilled a hole in the door and placed a lead thermometer (also had my non trustworthy IR gun handy). Turned on and was surprised that temp seemed low, very low. It was cycling on and off at about 300-325 While set to 400. So I cranked it up and finally got 400 at setting of 525. But then it started climbing. Eventually I had backed it down to 400 on the knob and had a stable 400 on the thermometer. So, what I learned from this is that just because the oven is cycling on and off doesn't mean that it is actually at the set temp. The oven needs to heat soak for about 30 minutes in my case.
    Last edited by Drew P; 09-22-2017 at 08:05 PM.

  2. #2
    Boolit Master




    Bzcraig's Avatar
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    My little convection toaster oven is the same and I learned by placing an oven thermometer in there which I still use to know when it reaches temp
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  3. #3
    Boolit Master
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    If your oven takes 30 minutes to get to temperature, it sounds like there is something wrong with the oven

  4. #4
    Boolit Master Drew P's Avatar
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    Quote Originally Posted by Grmps View Post
    If your oven takes 30 minutes to get to temperature, it sounds like there is something wrong with the oven
    Have you tested yours to see how long it actually takes to settle on set temp?

  5. #5
    Boolit Master
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    I have 2 countertop convection ovens and my home oven that come to temp in less than 10 min.

    1 trick with coating in ovens is to cover the bottom with a heat retaining material (I use ceramic BBQ briquettes, others use firebrick or pieces of steel) this doesn't speed up innitial warm up time but it greatly increases recovery time after you open the door.
    I use 2 of the hanging oven thermometers to initially set the oven to the right temperature 400* then I mark the dial on one and oven on the other (digital oven).

    Due to the configuration, placement, and type of thermostat used in lower end ovens their temperature readings are all off and directly affected by the surrounding temperature. Many people have their ovens hooked up to a PID teperature controller.

  6. #6
    Boolit Master

    DerekP Houston's Avatar
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    Quote Originally Posted by Drew P View Post
    So, what I learned from this is that just because the oven is cycling on and off doesn't mean that it is actually at the set temp. The oven needs to heat soak for about 30 minutes in my case.
    That is consistent with almost every oven, learned that in some baking classes. If you really want to cook at the proper temp the preheat cycle is needed for at least 30 minutes. You can also put bricks or baking stones inside to soak up the heat and help maintain even temp during cooking. Convection ovens are typically 25f lower than what the dial says.
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  7. #7
    Boolit Master Drew P's Avatar
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    Cool. Yeah I figured it was common knowledge lol. But it was news to me. I like the heat retention stones idea. I had thought about placing a thick steel plate above the heat elements to block the IR off the hot element and even out the temps but haven't tried it yet.

  8. #8
    Boolit Master


    Walter Laich's Avatar
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    All of this is why I wired mine with a PID
    it doesn't have a fan so the wiring was simple
    it is small enough not to need a fan
    I can do about 200 bullets at a time which, at my age, is fine and dandy
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  9. #9
    Boolit Master OS OK's Avatar
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    Use the right tool...

    Attachment 204567

    "Nuff said!"
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  10. #10
    Boolit Master waco's Avatar
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    OS OK nailed it. A lead thermometer is used for LIQUID material. Buy a $5 over thermometer like this one. ^^^^^^^^^^^
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  11. #11
    Boolit Master
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    You may be more familiar with this configuration like grandma used [hers wasn't made in China ]

    Taylor 3506 Oven Dial Thermometer Walmart #: 552230722 $2.34

    At this price, I bought 2 to confirm they agreed with each other


  12. #12
    Boolit Master OS OK's Avatar
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    `Grmps...that's what I used for a long time but it gave up the ghost so Dragonheart turned me on to the other type.
    a m e r i c a n p r a v d a

    Be a Patriot . . . expose their lies!

    In a time of deceit, telling the truth is a revolutionary act. G. Orwell

  13. #13
    Boolit Master CASTER OF LEAD's Avatar
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    Quote Originally Posted by Grmps View Post
    You may be more familiar with this configuration like grandma used [hers wasn't made in China ]

    Taylor 3506 Oven Dial Thermometer Walmart #: 552230722 $2.34

    At this price, I bought 2 to confirm they agreed with each other

    Ditto here. For the price as cheap as it is can't understand why more people don't follow suit. I mean we sink a lot of $$$$ into our craft ,but this simple cheap device has saved my bacon more than once. Lol - CASTER
    In regards to shooting safety.Until you are ready to fire, keep your booger hook off the bang switch.

  14. #14
    Boolit Master Drew P's Avatar
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    I'm sure there's a lot of things at Walmart that I need to buy. Just don't know they are there!

  15. #15
    Boolit Master
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    Quote Originally Posted by OS OK View Post
    `Grmps...that's what I used for a long time but it gave up the ghost so Dragonheart turned me on to the other type.

    OVEN GUIDE THERMOMETER - Accurate from 100F to 550F. Easy to read zone guide references Hangs or stands. Contains non-toxic mercury free fluid. Large, easy-to-read face. Durable stainless steel. Dishwasher safe. NSF listed

    Taylor 5921n Taylor Five Star Commercial Oven Guide Thermometer $10.50 definitely higher quality

    Hard for my eyes to see through the glass

  16. #16
    Boolit Mold
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    Yes, a PID temp controller is the way to go. I have a convection counter top oven with a fan and just wired the PID with a relay in place of the temp control and drilled a small hole through the side of the oven just above where the tray of bullets is an stuck a thermocouple sensor in there.
    Works great. Maintains the temp with in 5 degrees or so as long as the door is kept shut.

  17. #17
    Boolit Master
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    lsippell PID's are great, I would recommend wiring the fan directly to a power source. With the PID frequently/rapidly flipping the heat on and off the fan will burn out before it's time and having the fan on full time keeps the air circulating and temperature even

  18. #18
    Boolit Mold
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    Quote Originally Posted by Grmps View Post
    lsippell PID's are great, I would recommend wiring the fan directly to a power source. With the PID frequently/rapidly flipping the heat on and off the fan will burn out before it's time and having the fan on full time keeps the air circulating and temperature even
    The fan on mine is a separate circuit. Stays on constantly when the timer control is turned on. The timer control also turns on the PID. The way I wired it was to replace the temp controller with a solid state relay powering the heating element when told to by the PID.

    I love these PID's. I use one to control my melting pot and another warming block of aluminum that I rest my molds on.

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BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
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GC Gas Check