The threaded drive rod was made from standard 5/16 inch Whitworth threaded rod (18 TPI), only because this was to hand. M8 metric thread could have been used. The radius of the curve in the drive rod (which must be equal to the distance between the hinge and the drive rod) was 300mm. As this drive and it`s angular drive rate were to be controlled
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via a computer, this dimension and thread type are not critical. The controlling software could be set up to match. Many simple barn door designs use a straight drive rod which is rotated within a fixed drive nut. This is not possible when using a curved drive rod. A curved drive rod must be constrained at one end by a gimbal mount so that the drive rod cannot rotate. The drive nut must be free to be driven to rotate round the drive rod. - on the left hand side (ie hinge side), a mounting plate for ball and socket head. This was bent so that the ball and socket head was approximately horizontal when the barn door is set for local latitude. - mounting for the gunsight is situated near the middle of the top board. To the right hand side is a plate supporting a gimbal bearing that fixes the top end of the drive rod. The centre of the drive rod gear was cut away to make room for a captive drive nut. The captive drive nut was made by soldering an ordinary threaded nut into a drilled mild steel plate. This was then bolted exactly centrally onto the drive gear. Parts associated with the drive system were obtained (collected ) from various old printers. The drive gears are approximately 70mm diameter for the drive rod and 50mm diameter for the stepper motor, so there is a small gearing advantage for the motor stepper motor. Again, the plastic bush that was used for the lower bearing support was found in an old printer. This centre...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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