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Well I've pretty much finished the secondary cage, except for the plate
to hold the finder scope. I had to make a base plate for the focuser
because the focuser board's curve is 236mm dia and the focusers base
is set for a tube of 358mm. But you can see from the photo that I had
to raise the focuser off the focuser board by at least 5mm so the focuser
turn knob cleared the lower ring, I raised it 10mm. So the adaptor plate
performs two purposes Raise and Adapt.
The rocker box is complete with teflon bearings in place. I also used two
Eazy Glide discs 25mm dia on the inside to guide the mirror box in it's travel.
Which had to be countersunk 1.5mm either side, I used a router to do that.
I'm still to attach the base board and still to figure if I want it round or
square. Keeping it square will give a slightly better spread on the three feet.
After that it's pretty much just the mirror cell to complete. I'm going to drill
and tap a thread into each of the three bolts, as marked. In each I'm going
to thread a small flat head brass screw fitted with a locking nut which will
lock against the end of each collinmating bolt to form the pivot for the two
point plate on each point, making a 6 point cell. The image shows the top
side of the cell, I'm going to make three wooden knobs to fit to the bolt
heads (bottom side) and will be spring loaded from the bottom side. I'm
thinking I will probably go with Velcro circle for each point, I'm pretty sure
(although I haven't done the maths yet) that I'm going to be top heavy.
Doing a sling system on such a small mirror although might look a lil more
funky it isn't going to add as much weight with the extra bits to do so. Once
I get the optical system in place I can cut the truss pole to the right length.
Anyways another weekend free of kids to experiment.
regards,CS
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