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Message: <blockquote data-quote="a33" data-source="post: 1090117" data-attributes="member: 332642">I define the situation: T-A lies at the the other end (opposite) of BB-A, as 180 degrees; andthe situation: T-A lies exactly above BB-A, as zero degrees.(Theoretical maximums, that in practice never can exist.)That way, the position of BB and T can be anywhere (relative to the dish and mount), and you can choose where you want to have your most precise actuator control (at about 90 degrees!).And also this applies, then:However, the due south/north position then lies somewhere between that 0-180 degrees, not at an obligatory fixed point in advance. In your calculation you have to determine where exactly. So that you can add a (positive or negative) USALS angle to it, which has zero at due south/north.That ZeroPosition I calculate with my ZeroAngle (= ApexAngle) equation, above.[ I now realize I use the word zero for two situations: for the zero-180 degrees range; and for the zero-position: due south/north angle that lies somewhere between the 0 and 180 degrees. Sorry for the confusion.Looking for another word: From now on I will (try to) call the ZeroAngle the ApexAngle, the Apex being the highest point of the arc, that is ofcourse situated exactly due south/north.The range from 0-180 degrees could also be called actuator angle or so? So that ActuatorAngle = ApexAngle + USALSAngle?]Universal it is, when you allow TA to be positive for the actuator at the eastside of the axis, or negative for the westside. (See my earlier document.)That I checked and elaborated in my above document, and in the equations it works out perfectly, as far as I tested. Previously I calculated with 'abs' and 'sign'-functions, but that isn't needed I discovered.I think the calculator should have an absolute maximum calculation range for T-A-BB of 10 to 170 degrees, with the possibility to enter limit-values even further constricted (to 15 and 163, just to name some examples). This would be mount-protection (against flipping over, and because all the pivots are not mathematical points, but have a width).Actuator length protection I would not set as separate limits. When needed, they can be set as angle limits also. And the actuator will have its own limit-switches, to protect it, I guess.But maybe some actuator-users can say something about the needs for this limit-settings....I hope I have expressed myself clearly in english again,Greetz,A33</blockquote>

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