Wondering whether/how it is feasible to maintain the plumb-line position of a hook block constrained to the crane boom whilst the boom gets moved up/down?

Dynamic components allow you to lock the position of the component, so if both the hook block and the crane boom are both within the same component, you can force the hook block to follow the crane boom’s position. Pretty much Hook Block’s position = Crane boom’s position + size of the crane boom …

Thanks for the feedback, but I am not sure how to implement this plumb-line position constraints between the boom and the hook block. The horizontal movement (swivel) of the hook block together with the boom is covered (grouped the hook block with the boom). But how to maintain the plumb-line if th…

Obviously you make the boom a component with its red axis along its center line. And as its origin you choose where it rotates, right where both cylinder center lines intersect. The parent component, the boom, has a child component (hook plus cable (say=hook)) nested inside. The hook rotates wit…

Like @Wo3Dan said, Hook ROTX= -1*(Parent!ROTX) Only problem is you’ll have to use the Redraw function every time you move the boom. I think there’s a way to have to redraw automatically with a Current command, but not sure.

Perfect, that works like a charm! I am much obliged for the help! It is (unfortunately) not redrawing automatically, this needs the extra manual click

See next file for basic solution: crane.skp (75.2 KB) Note the quotation marks in the ‘Animate’ function. This allows for working with negative values along the line. Otherwise the animation won’t function properly.

Similar as to having dynamic option menu, both require the extra click to ‘redraw’ the model unfortunately.

thank you both! Thing happening now is that when the cranes gets swiveled (tower, boom and hook block) around the z-axis of the tower the hook block turns as well in its z-axis, which is not supposed to happened, and honestly I do not get it why this happening. can this prevented?

You have control over the X, Y, and Z axes in the dynamic attributes. You’ll have to provide the value in each to control if you want the hook to follow the axis of the component that it’s nested in or not. If not, it’ll require a math formula to have to move the oppose angle to balance out

There we go, I am apparently not so good with the math stuff… That is where it gets a bit hard for average SU user

[Q] parametric - constrain plumb-line position

SketchUp Dynamic Components

k_m November 17, 2014, 12:56pm 19

Wow, that is truly impressive! Seems that ANIMATE is somehow working better than REDRAW

Using interact with a component and a sub-component

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[Q] parametric - constrain plumb-line position

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