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  • Users: mingki
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  1. mingki

    Boat steering

    Hi I am installing these motors to the backside of my boat for propulsion and also for steering using dual motor controller. My boat is this. The steering mechanism is like this. The motors are all fixed on my boat and I want to steer the boat by proportionally controlling each motors...
  2. mingki

    Does anyone know how this golf cart

    Does anyone know how this golf cart follows its user? (6) CaddyTrek R3 Smart Robotic Electric Golf Cart Bag Caddy with Smart Vision AI Technology - YouTube This is so interesting. I wonder how this thing follows its user based on what tracking reference and what type of vision camera is used...
  3. mingki

    Remote control carrier tracker following

    Hi I need to make this electric cart to follow me around at a certain distance which could be adjusted. https://youtu.be/93zouLEdgRQ The video shows remotely controlled electric cart and I want this cart to follow me like the one in the picture below. The robot follows the wearable tracker...
  4. mingki

    How to protect a motor controller from the noise coming out of relay

    Hi, I am testing my dual motor controller with two BLDC motors(48V, 400W) using this schematic. Unfortunately, I am having some electric noise from relays so I loose connection with my motor controller randomly whenever I turn on and off the motor. The connection lose is irregular. Sometimes...
  5. mingki

    Turning on & off a motor using PWM from a remote control.

    Hi, I am trying to get my 24V(70W) motor turn on and off using my remote controller. This remote controller puts out PWM from its receiver so I want to be able to control on & off action of my motor using a remote control. Is there a simple tutorial or circuit to follow? Thank you.
  6. mingki

    On & Off switching mechanism required

    Hi guys. I am using the following driver to control a BLDC motor. I use 10k ohm variable resistor to control the speed of my motor and I should be able to hold the motor at a certain position with heavy loads. To do that, the manufacturer of the driver told me to connect pin 6(Motor Stop) to...
  7. mingki

    On & Off switch installation

    Hi I am trying to install an on & off switch to my battery powered motor control circuit. I want to use this switch. By using this switch, I want to be able to cut off the power supplied to all the motors and the LED light but only 400W motor is cut off while other 24V motor and LED light is...
  8. mingki

    Firefighting cart development

    Hi, I am developing a cart which is able to enter into narrow mountain offroad. The image of my cart is attached. I want to install a firefighting mechanism on my cart. I will put on a 200L water tank on my cart and a pump connecting them using 25A(1inch) pipe line. My cart is battery driven...
  9. mingki

    Pipe bending coordinates

    Hi guys I am trying to get bending coordinates from 3d pipe model. I have this model from CMM scanning function. https://www.flickr.com/photos/66323701@N04/17029525275/ I want to know how I can get X, Y, Z coordiates from every bending points as below picture...
  10. mingki

    Flanging Ø12.7mm copper tube

    Hi guys. I am trying to flange a copper tube which is Ø12.7mm diameter and 1.24mm thickness. Please check this picture. https://www.flickr.com/photos/66323701@N04/16727576637/ https://www.flickr.com/photos/66323701@N04/16933609342/ The pipe end should be Ø18.5mm after flanging. Is there a...
  11. mingki

    Electro discharge machining

    Hi, I am trying build EDM machine by following this show. http://www.youtube.com/watch?v=uUN4_-xp1Wc&feature=fvwrel I wonder what type of solenoid is used in this tutorial.
  12. mingki

    Electrochemical machining

    I am trying to build an electro chemical machining device. Could you recommend me some good tutorials on how to build electro chemical machining device? Please help~!
  13. mingki

    Making bursting discs

    Hi, I will make round plates which bursts when it reaches to a certain pressure(13kgf/cm2) and I am thinking the required processes at the moment. Here is what I think. There are two round(100mm diameter, 0.5mm thickness) plate(Stainless 316L) and I will make 50mm diameter dome(dome height...
  14. mingki

    How to make groove on the surface of nonferrous metal

    Hi, I am trying to make groove on the surface of nonferrous metal(currently, I am using nickel, monel, inconel). It is not easy because the thickness of the metal I am using is just 0.027mm. How can I make groove(depth: 0.0135mm) on the surface of nonferrous metal which has the thickness of...
  15. mingki

    ASME SECTION VIII Sizing of bursting disc

    Hi, I am trying to size the correct burst disc and calculate required discharge area according to ASME VIII. Here's the specification. -Burst design pressure(Po): 21.34PSIG -Burst pressure(Pb) : 23.47PSIG -Absolute bursting pressure(P1) : 38.17PSIA -Flow required(W) : 92,395.72lb/hr And I am...

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