Truss Dob mirror cell question

[weareborg]

Hi guys and gals

I am thinking of making a 9 point flotation cell for my 8" mirror, but I dont know if it going to be a bit of an over-kill. This will then be installed into my 8" truss dob design. What do you guys think????

Andy

[Milamber]

9 is about right I'd say. 3 would do it but... final choice though would depend on the mirror really. Thickness, fr, material.

Arthur

[weareborg]

Thanks Arthur for the reply. My mirror in question is from a Skywatcher Explorer 200 OTA. Not sure on the thickness because i've not removed from the tube, as of yet. As for the material, I guess I'll have to do some searching. Unless anybody here knows what material the Skywatcher mirrors are made from????

Andy

[Andrew*]

Pretty sure it's pyrex

[Milamber]

In that case, the cell it comes in will be fine! I'd would say just transplant the cell/mirror together and drill the required three holes in the proposed mounting for the collimation bolts. Simples

Much more secure than other dob-type methods, and collimation is more likely to last a session.

Arthur

[weareborg]

I was thinking of doing that originally to save time and money, but I thouight I would just ask 1st. I guess all I need do then is make up the rear tail-gate and mount the mirror cell onto that. Correct????

Andy

[Milamber]

That's about it - but no permanent stuff until you check the EP position. Saves embarrassing saw or glue moments later!

[weareborg]

LOL. yeah I dont want to go down that route. As it is at the moment, Im still in the early planning stages, as Ive just purchased a copy of 'The Dobsonian Telescope' aand I havent been able to pu it down. Its a great book, with surprising easy to follow step, albeit, for a much larger dob than mine, but i can easily scale it down.