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Payload capacity.


Guest peepshow
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Guest peepshow

Maybe another daft question.......


 


Does the payload capacity of a mount include the counterweights ?


 


Also what are advantages/disadvantages of either using a heavy counterweight near to the mount as against a lighter one near the end of the counterweight bar?


 


Thanks.


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Guest peepshow

So short and heavy rather than long and light.   Thanks.


 


Less to stick out too if the bar is shortened as well.


I see that there are bar lengtheners around for such as NEQ6 but no short versions anywhere


for other mounts.    So it's a hacksaw job. :)


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Guest Tweedledum

Actually they produce the same moment of inertia (half the weight at twice the length = double weight *  length). It is a function of mass v length from the fulcrum point. Noel has it in that if the counterbalance bends from the mass then it may incur a vibration. This would be due to the stiffness rather than the force at the fulcrum point.


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Agreed, inerita is probably the wrong word. It is the mass of the weight at a greater distance from the pivot point that causes the flex and so the poorer guiding results. :D

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Guest Bonds_the_Name

Just to throw the following into the discussion. The moment of inertia will be important from the point of view of accelerating the load. This will occur at switch on and when is applying control signals to change the mount speed when autoguiding. If there is much backlash then a high inertia load will damage the gears when rapid changes in rotation speed are called for.

Jeremy.

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