Guest peepshow Posted November 16, 2014 Share Posted November 16, 2014 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. Link to comment Share on other sites More sharing options...
glider Posted November 16, 2014 Share Posted November 16, 2014 Payload excludes counter weights. Lighter weight at the end of the counter weight bar can cause vibrations as the bar can flex. I think! Link to comment Share on other sites More sharing options...
+Ibbo Posted November 16, 2014 Share Posted November 16, 2014 I agree with him Link to comment Share on other sites More sharing options...
+Graham Posted November 16, 2014 Share Posted November 16, 2014 Heavy counter weight near mount produces less inertia better tracking. Link to comment Share on other sites More sharing options...
Guest peepshow Posted November 16, 2014 Share Posted November 16, 2014 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. Link to comment Share on other sites More sharing options...
Guest Tweedledum Posted November 16, 2014 Share Posted November 16, 2014 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. Link to comment Share on other sites More sharing options...
+Graham Posted November 17, 2014 Share Posted November 17, 2014 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. Link to comment Share on other sites More sharing options...
+Ibbo Posted November 17, 2014 Share Posted November 17, 2014 moments of force I think Link to comment Share on other sites More sharing options...
glider Posted November 17, 2014 Share Posted November 17, 2014 I think we should 'torque' about this some more! Link to comment Share on other sites More sharing options...
Guest Tweedledum Posted November 17, 2014 Share Posted November 17, 2014 Said with force, no inertia there. Seize the moment..... Link to comment Share on other sites More sharing options...
Johnnyaardvark Posted November 17, 2014 Share Posted November 17, 2014 Just a moment! :-) Link to comment Share on other sites More sharing options...
Guest peepshow Posted November 18, 2014 Share Posted November 18, 2014 I hope this will be a well 'balanced' debate. Link to comment Share on other sites More sharing options...
+RonC Posted November 18, 2014 Share Posted November 18, 2014 Too weightier subject for me!! Link to comment Share on other sites More sharing options...
Guest peepshow Posted November 18, 2014 Share Posted November 18, 2014 Too weightier subject for me!! At the other end of the bar they will serve something lighter for you. Link to comment Share on other sites More sharing options...
Guest Bonds_the_Name Posted November 18, 2014 Share Posted November 18, 2014 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. Link to comment Share on other sites More sharing options...
Guest Tweedledum Posted November 18, 2014 Share Posted November 18, 2014 Martini shaken not vibrated! Link to comment Share on other sites More sharing options...
Johnnyaardvark Posted November 18, 2014 Share Posted November 18, 2014 At the other end of the bar they will serve something lighter for you. If it's a long bar. Link to comment Share on other sites More sharing options...
glider Posted November 18, 2014 Share Posted November 18, 2014 Raffles, Singapore has a Long Bar! Link to comment Share on other sites More sharing options...
Guest Tweedledum Posted November 18, 2014 Share Posted November 18, 2014 Then down to the Tiffin Room! Link to comment Share on other sites More sharing options...
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