To calculate the steps per second for a single rotation in a single sidereal day. 200 (motor steps per revolution) x 99.05 (gearbox reduction) x 5 (final drive) 16 ( microstepping) 1,584,800 steps. To calculate the steps for a single rotation of the telescope.
#Large telescope drawing cut out full#
Alternatively, a blob of hot glue will suffice. It equates to one full rotation of the telescope and is 23.9344696 hours. The top screw passes through a hole in the bottom of the case. Divide that length by two and then add another inch. Add the value of the focal lengths of the short and long lens together. The length of the assembled telescope will be a little longer than the sum of the focal lengths of the two lenses. Once you have made your finder, you’ll need to mount it and align it with your telescope. The mailing tubes will be the body of the telescope with the smaller one sliding inside the larger one. We found these online, along with the lens, a Fresnel magnifier sheet.Ĭutting glass is easy – score with a glass-cutting wheel and snap over a straight edge – but it is advisable to dull the resulting sharp edges by rubbing on a flat stone.Īlternatively use clear plastic, which can be cut from an old CD case. The front surface mirror is a disposable dentist’s mirror. The clear glass was cut from an old picture frame, and we used the frame’s thin MDF backing to make the case. The LED, coin cell holder and switch are from an educational supplier. We sourced the components for this project imaginatively to keep the cost down. When the distant sky is viewed through this screen, the red circle is superimposed on it. The Very Large Telescope (VLT) is a facility operated by the European Southern Observatory, located on Cerro Paranal in the Atacama Desert of northern Chile. This is reflected backwards again by a glass viewing screen, mounted at 45° in a hood. The light is then reflected upwards by a mirror mounted at 45° and through a lens, which produces a sharp image. The red light is reflected backwards through a clear glass screen, painted matt black except for a small ring in the centre. The LED is powered by a coin cell battery, via a switch on the back panel. Our design has a red LED that illuminates the white interior of the front of the case. Many stargazers use similar devices because they allow you to keep both eyes open and see a much larger area of sky, making it easier to jump to the target.
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