Rebuild to a lowrider (2)

Goto mechanics

The mechanics necessary for computer control constituted of a timing belt on one of the side bearings and a stainless steel belt on the other. One of the side bearings is running on pullys and the other side is running on two delrin wheels. The front pully is driven by a stepper motor. Increments on the alt and azimuth axes are such that they result in a micro step of less than 0.15 arcsec. This means tha that steps aren’t visible in the eyepiece until one magnifies over 800x. At normal magnification, the tracking motion smooth and steps aren’t visible.


Flexrocker

The rocker is basically a 12 mm plywood plate which is reinforce with carbon fabric on the top is also strenghtend by adding an octagon of carbon tubing (again hockey stick) on the underside. When you put the rocker ontop of the ground ring this octagon disseapers from view, creating a low but still compact rocker. Because the weight is not translated directly to the groundring this not a traditional flex rocker, but a kind of compromise. So the rocker rolls on four bearings but it doesn’t flex evenly.



Groundring

The ground ring is composed of 3 layers of 12 mm plywood with 9 mm plywood dividers between the second and third layer. Originally I did not have any dividers between the plywood rings, but this first groundring was not rigid enough. On the inside of the ring both a timing belt and stainless steel strip bonded. A pully runs against the timing belt and two bearings (one of which is springloaded) run against the stainless steel strip. On the outside of the ground ring a red neon wire is glue behind the plastic strip. When you turn it on, this creates a red glowing halo around the telescope. This not to deify the telescope but will hopefully prevent anyone from walking into the telescope during public events of star parties.



Strings

The strings are made according to the same recipe as described in previous versions. The turnbuckles are no longer used to collimate but put fixed after the initial alignment of the secondary ring. Collimating is now done the traditional way using two delrin knobs on the secondary holder. The telescope retains its collimation without problems during a night.



Esthetics

The telescope is coated with DD-coating to protect the carbon. By mixing the paint with a slight shade of blue, the carbon pattern remains visible. This was first used on racingcars and it creates a special effect. In the daylight the various components of the telescope have a color that varies between dark blue (almost purple) and very light blue depending on the angle at which the sun shines on a part. I think this is the first telescope ever with this look. The mirror cover is covered with a vinyl sticker printed with a custom made image of a star map. This way if I forget to take my charts I can at least now which star is which so I can program the Goto computer.


Rebuild to lowrider (3)