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Old 24-03-2012, 09:01 PM
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avandonk
avandonk

avandonk is offline
 
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
Thanks for your concern Paul. Here are a couple of images of the pier. It just does not deflect or have nasty harmonics.

The eight bolts at the bottom allow the pier to be adjusted level without any extra stuff at the top. This gives about 2 or more hours past the meridian so no flips are needed.

The four almost full length tapered gussets ensure that there is no bending at the base. This is where the bending moment is at a maximum. A pier can be considered as a vertical spring pendulum and will have a harmonic frequency depending on load and stiffness. The taper gives the system a low 'Q' so any high frequencies from mount motors or fans will be damped.

I have had about 40+ kg on the EQ6 without any problems. It was SN10 with a focal length of 1150mm.

If I do notice any flex I will just get a new pier made with a larger diameter tube.


Bert
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