Making+the+secondary+holder+and+spider

Images below show the secondary holder and spider for the TRO after first assembly. They still need lightweighting (drill lots of holes) and painting black.







Below image shows the secondary that has just been water cut out. See the secondary mirror design page for specifications.



Cutting out the rings for the secondary cage was done using a router. The outer ring is cut first before the inner is cut out. Two are required to make the top end cage. 25mm broom handles were used to connect the rings together. A wood drill is used to recess the poles into the rings.





Below images show the secondary cage after inital assembly. The spider has yet to be installed. The inside diameter of the cage is 34 inches. The outside is 38 inches. It is made from good quality 3/4 inch exterior ply. 24mm wooden broom handles were used for the interconnecting poles. 8 poles were used in total. The cabe is 8 inches front to back.