Search results

  1. Minder

    RS232 message to pulse

    +1 on a small Micro if practical, you get a interrupt flag every char input, the extra processing power would allow you to do as you wish with the No. of chr's etc. and be more flexible. M.
  2. Minder

    Voltage rating of wire

    Incidentally just in case you might think of using Automotive Hi tension plug wire the conductor can vary in composition. The vast majority of cores are conductive carbon wrapped with fine copper wire. Other cores wrap wire around a magnetic material. Conductive carbon can break down over time...
  3. Minder

    Voltage rating of wire

    You will need a cable with a manuf. insulation rating according to the EMF your system is using. See Insulation breakdown. https://en.wikipedia.org/wiki/Dielectric_strength M.
  4. Minder

    Voltage rating of wire

    High Kv cable requires a suitable insulation to prevent breakdown, if you go to the Cable manuf sites, they usually have technical information on their respective cable ratings. Beldon is one such large manuf. M.
  5. Minder

    Inductive load control

    The link shown is intended for Universal (AC/DC brushed) motors. A simple triac controller will usually work with small AC fans that are shaded pole/split phase type. M.
  6. Minder

    Code needed for PIC16F684 to control LED's

    Look at Nigel Goodwins tutorials . M.
  7. Minder

    Killing SSR (relays) - Need to understand

  8. Minder

    Where could I find a low RPM high torque motor?

    As I said, for accurate sizing the input torque to the shredder operating at its highest load would need to be known in order to accurately size a motor, if you want to use the existing design pictured, that appears to use an ordinary induction motor, if so, I would tend to go with a 4 pole...
  9. Minder

    Where could I find a low RPM high torque motor?

    That is using a worm and pinion gear box, if it is a four pole motor then the ratio is ~25:1. If 2 pole then 12:1. Motor 2hp - 2.5hp. Looks a little oversized for that application? M.
  10. Minder

    Where could I find a low RPM high torque motor?

    On low RPM applications I have used a automotive torque wrench in cases where a thread was on the end of the input shaft, alternatively if it has any other means of winding a string around a pulley etc, and use a (fishing) spring gauge and measure Inch/Lbs etc, based on the radius of the pulley...
  11. Minder

    Where could I find a low RPM high torque motor?

    The most economical/efficient way is to use a reduction G.B. You need to do an empirical test of the torque required or at least an estimate. Torque increases at the ratio of the reduction. Was the original direct drive? M.
  12. Minder

    How to ground unwanted AC from a metal case?

    Trumf? I am surprised with a manuf. such as Trumf to design a machine with that such a flaw? M.
  13. Minder

    How to ground unwanted AC from a metal case?

    I work with CNC machines and have seen machines overheating in the Hydraulic section. I wonder if you have looked at it from the other angle, Why is it overheating? Rather than detect it when it does. Often this is because the hydraulic pump is producing pressure continuously, even when not...
  14. Minder

    Need to replace DC gearmotor with a stepper one

    Although often used as a motor torque or HP size, a motor NEMA size refers to the frame size not the torque, you can have many torques sizes in the same NEMA frame. Did you include any gearing in your torque calculations? M.
  15. Minder

    Someone please help clicking relay

    It was intended to check to see if the full voltage is across the coil or intermittent, not to check the diode, it is just a convenient place to check the voltage across the coil without accessing the bottom of the board. The diode is normally used to suppress any H.V. BEMF . M.
  16. Minder

    2 motors pushing an object. 1 motor goes bad... other keeps going... object breaks???

    Another faster method than a fuse is a slot opto detector on each motor or activated device and a couple 555 missing pulse detectors, a small relay on the output of each in an OR'd fashion would shut the system down. M.
  17. Minder

    DC Motors and speed control

    If mechanically noisy using a BLDC motor is not going to change a thing, I have used ex T.M. at 5Khz-10Khz PWM with no electrical noise evident. M.
  18. Minder

    DC Motors and speed control

    A small DC motor is a good choice, the size will depend on the torque required for the application. You can use a simple 555 PWM such as http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm The motor power can be whatever the motor is rated for with a suitable sized mosfet, I would use 15v...
  19. Minder

    Is this actuator really 12VDC? Could it be 24V?

    The manufacturers maximum current rating is usually the maximum continuous current, IOW, if you limit the current to 4.8amps with a continuous stalled load, you would not damage the motor, the peak load current is much higher and should only be experienced for a very brief period, otherwise...
  20. Minder

    Help with powering immersion heater!!!

    Did you measure the resistance across the terminals, should measure ~16ohms. Even if it had internal over temp, it would still initially power up. M.
View older results
Top