Double Arm Barn Door Tracker

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Double arm barn door tracker. Original concept by dave trott. The hinge is aligned with a celestial pole and the boards are then driven apart or together at a constant rate usually by turning a. Make sure everything is square and moves freely clap the 2 hinged boards together and shout action a few times like they do when making movies if it makes a nice clack sound it should work well for a star tracker now measure 228 55mm from the center of the hinge pin down the middle of the board and mark the drive rod holes do this on. Sky telescope february 1988 p213 p214.

A double arm mount offers much greater accuracy than conventional designs. Smits notes that all of dave trott s drives including the single arm version have the drive screw mounted as the expanding base of an isosceles triangle. Calculation of drive arm length. A camera is mounted on the top board usually with some sort of ball joint to allow the camera to be pointed in any direction.

First cut the 500mm length in half and mount the hinge. An inexpensive route to astrophotography has long been the scotch mount also known as the barn door drive after its appearance or the haig mount after its inventor. The 6x30 mm finder scope is parallel to the hinges so it can be. To use it the tracker is set up in the field so that the hinges are aligned with the earth s axis of rotation.

For some of my longer exposures i use this device which can track the motion of the stars across the sky while the image is being made. Signal frequencies on cmos 4024 pins. A simple single arm barn door tracker can be made by attaching two pieces of wood together with a hinge. His paper a mathematical analysis of the double arm barn door drive appears on pages 155 160 of the december 1988 monthly notices of the astronomical society of south africa.

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