Building the pyramid frame without welding

[skywatcher]

For various reasons, i decided to build the pyramid frame without welding.
One of the reasons is increased flexibility (for making experiments or to simplify transport).

First we make the base, which is quite easy because there are only nice 90 deg and 45 deg angles.

Step 1:

Mark a 45 deg angle on the ends of the steel pipes and cut them:

[skywatcher]

Step 2:

Drill some 4 mm holes into the tubes to mount flat steel angles (they are 120 x 120 x 20 mm):

[skywatcher]

Now it looks like this:

[skywatcher]

The finished pyramid base:

[skywatcher]

Now we will prepare the side tubes.

Step 3:

Mark 54 deg angles as shown in the picture. This gives the lower ends of the tubes. Cut the tubes at the marked lines.