Step by step

Step 1

Download the astrolabe generator program (astrolabeproject. com.) Input your location (the format is ddmmssN, dddmmssW where d = degrees, m = minutes, s = seconds) and print the dials and rulers required. Use a copy as a template for cutting out.

Step 2

Print off the downloadable plans and template. Check the measurements against your printed dials and mark out the MDF parts (the generator can produce different file types and sizes vary). The upper throne layer can be formed from the ring.

Step 3

Use your saw to cut out the parts. Drill a 4mm hole in the centre of the mater back and rete discs and join with temporary screws. Clamp the upper ring to the mater back and file and sand any high spots until the rete turns with no binding.

Step 4

Stick a paper copy of the rete to the rete disc. Drill holes in open areas through which you can pass the fine saw blade. Taking great care – especially around star pointers – cut out each part. Support the part you are cutting, or it may snap.

Step 5

Cut small sighting blocks to add to the alidade. Glue these in place and glue the ring to the mater back. Make sure the ring fits round the rete before clamping. When the glue is dry, spray the parts with some primer and sand everything smooth.

Step 6

Decorate the astrolabe with spray paint. Cut round the printouts with a knife or scalpel. Glue on the trimmed rete, mater and ruler printouts. Finish off with clear lacquer, before assembling with a screw, placing a ring through the throne.