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Hi all,
I built an in-ground concrete pier for my 10" dob and mount...(as the obersvatory is a roll-away type.)
I dug a hole 500mm deep, square in shape...I then cast 3 x 150mm by 800mm concrete pins (using PVC pipe)..which were set in the hole leaving 300mm above ground...the first concrete pour was to ground level and allowed to set overnight..a equalaterial triangular shaped mould was placed over the square...(this would allow me to cast the 3 recesses into the top using polystyrene for the mount's feet after the pour)...all the concrete used had a water barrier additive mixed in.
The ground surrounding the pier had been levelled and packed with builder's sand and concrete pavers laid on top..a 300mm wide x 100mm deep area surrounding the pier at ground level also had sand packed...all viewing chairs have had rubber leg caps fitted so far no noticable vibration viewing at high magnification..works for me!!
Cheers!
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