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  • swander commented on flywoodkb's instructable Hot Wire Foam Cutter2 months ago
    Hot Wire Foam Cutter

    Made one, but burned out my transformer? For some tips on the dimmer circuit, I made mine but had no variable out of the dimmer. I looked at schematic again and realized even with AC, you need the BLACK wire out of the black and white AC plug cord wires to go to the black wire of dimmer (I used a 15A fuse in line from a car stereo) and then red out to the transformer Primary INPUT, (green to transformer case) then the white AC side goes into the other Primary side input. if you do it backwards, you wont have any adjustment. Also, measure your resistance of the cutting wire. I used stainless wire from a 1/16 cable strand bought for .17/foot at Home depot. You get like 16 strands in there of some pretty small gauge wire. single 40AWG strand broke under stress so we upped it to 3 strands....see more »Made one, but burned out my transformer? For some tips on the dimmer circuit, I made mine but had no variable out of the dimmer. I looked at schematic again and realized even with AC, you need the BLACK wire out of the black and white AC plug cord wires to go to the black wire of dimmer (I used a 15A fuse in line from a car stereo) and then red out to the transformer Primary INPUT, (green to transformer case) then the white AC side goes into the other Primary side input. if you do it backwards, you wont have any adjustment. Also, measure your resistance of the cutting wire. I used stainless wire from a 1/16 cable strand bought for .17/foot at Home depot. You get like 16 strands in there of some pretty small gauge wire. single 40AWG strand broke under stress so we upped it to 3 strands. The resistance of the 1 strand was 2.2 Ohms. and we were using the 24V output of a multi tap transformer out of a cassette deck. Variable 1-24V worked great but it died after about 5 minutes on 12V. The transformer was cooking when I felt it! I should have used the 11V (it had 11, 24 and 44V) tap and varied that or just use the proper transformer. Even a 6V lantern battery straight wired to cutter generated enough heat to slice the foam.

    I have used professional ones and they have a pre measured nichrome wire with loops on the ends. They attach over pins on the arm and base. The arm is a semi rigid spring steel 90 degree bend that bends down to accept the wire and rebounds to apply tension. This makes it quick to disconnect the wire and run it through a closed hole in the workpiece to make interior cuts. I cut about 60 "Coors Light" cursive letter signs for a contract with this rig and never burned a wire. 600F is optimal cutting temperature. They also rectified the AC to DC to make it a lot safer for the end user as I was touching the wire more than once.

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  • Dirt Cheap Ignition Retard for Turbocharged Engines for Less Than $100.

    5 at the cam and 10 at the crank is correct as the crank turns 2x speed of the cam on a 4 cycle motor. Cam cog is always bigger than the crank cog with a timing belt or chain.

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  • How to Measure AC Voltage Using Multimeter

    it has also been suggested that you apply the probes to the work piece black (common) first then red, and remove them red, then black. Think: "Black first on , last off"

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  • swander commented on Hashem_Mehyar's instructable DIY Cassette Deck Drive Belts8 months ago
    DIY Cassette Deck Drive Belts

    rubber bands work too, (although not in the case of long car audio belt apps) but they are too stretchy to provide a rock solid wow and flutter ratio (warble) but they do work to determine of the deck is salvageable. They often break after a few months of sitting though. Once you get it to work with a rubber band, you can use the string method to determine what size belt you REALLY need. string up your belt path tight with a single strand and cut where they overlap. Measure the total length, deduct 10% to compensate for stretch and go online or to a electronics store and buy a generic replacement belt. Usually about $5. Old belts slip, even if they look good from a visual standpoint, they get stretched and due to their low elastic design, cannot recover to provide the proper torque to t...see more »rubber bands work too, (although not in the case of long car audio belt apps) but they are too stretchy to provide a rock solid wow and flutter ratio (warble) but they do work to determine of the deck is salvageable. They often break after a few months of sitting though. Once you get it to work with a rubber band, you can use the string method to determine what size belt you REALLY need. string up your belt path tight with a single strand and cut where they overlap. Measure the total length, deduct 10% to compensate for stretch and go online or to a electronics store and buy a generic replacement belt. Usually about $5. Old belts slip, even if they look good from a visual standpoint, they get stretched and due to their low elastic design, cannot recover to provide the proper torque to the drive wheels.

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  • Making A Fridge Compressor Into A Vacuum Pump

    ISO 10 is the usual oil in consumer refrigerators and the pump i pulled from a 14 foot kitchen fridge (already cut by scrapper for coils) had a stroke of 4.99 cm3. You can look up all sorts of specs by google the pump number. Mine was an EMY-60HER. Sure R134a is bad for environment, but i think its the same stuff that is in duster cans or air horns. I think it is not regulated when used outside the HVAC biz?

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  • swander commented on Lorddrake's instructable Rare Earth Magnets From Old Hard Drives1 year ago
    Rare Earth Magnets From Old Hard Drives

    I believe the one failsafe taped screw is somewhat standardized to eliminate the chance the drive vibrating ALL the screws loose and coming apart in a computer. 10K rpm drives open in a case and then breaking is not good news for anyone.

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  • The simplest FM transmitter... Without coil/inductor

    Remember, in the US, FM offset is odd numbers so some electronic tuners wont be able to find an even frequency such as 93.2. Im sure a variable could be used to tune it to a vacant frequency.

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