Quote:
Originally Posted by OzEclipse
Steve,
Even though you've decided to go for the 90x90mm I'll answer your question.
The hole in the center would have no effect on the overall strength.
Joe
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Fantastic then, well perhaps that would be an option to someone who did want power bring permanent such as a solar setup. You could easily drill a hole mid way and put a little box on the outside with data etc in it.
Anyway attached is a picture of the final plan and the hole dug to around 850mm depth.
The hole was dug in about an hour, turns out brisbanes rain has soaked around 600mm into the ground. Made work pretty easy.
the sketch shows the total pier length on the left and the hole depth above the gravel and plate I put down there as well as the height of my EQ6 tripod which is perfect height for me. Grass texture represents the surface.
I have allowed about 50mm or so of adjustment in height and leveling. I wanted to keep it as small as possible and I don't trust my self to make a wooden pier perfectly level without it. the disk on top is an aluminum adapter plate that a guy on IIS made up for me for my steel pier that has not been put on hold for a while.. (big project will post news later)
Small recesses cut into the wood to allow the bolts to come in. main plates are 50mm thick 200mm square sleepers and 16mm bolts/threaded rods.
Plates attached to pier by 130mm coach screws.
Thanks so for the feedback and suggestions. As usual the IIS community has been great in helping me with a final design.
I would have gone the 100 x 75 but I don't like carseldine bunnings anymore and lawnton only had 90x90
