telescope mountings & drives

equatorial platform

Plans and instructions for an equatorial platform using cylindrical bearings instead of conical bearings.

binocular mount

Plans for an easy to build binocular mount, complete with measured drawings.

voltage inverter

This dual axis drive corrector can run either 240V/50Hz or 120V/60Hz synchronous motors from a 12V battery.

simple wedge

A wedge to mount your ETX or Questar to a Celestron or Meade tripod.

miscellany

crayford focuser design

A design for a Crayford style focuser. Complete with measured drawings and photos.

eyepiece barrel and thread sizes

What size is a 1¼" eyepiece - exactly? Also lots of tips on tapping threads, C and T-mount sizes, etc.

guide to aluminum alloys

More than any telescope maker needs to know about aluminum.

a quick & dirty guide to anodizing

Just what we need - more dangerous chemicals to play with!

all about curved spiders

How to properly design a spider with curved vanes to eliminate diffraction spikes.