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Clarification: Telescoping mechanism

21-Topaz II

Clarification: Telescoping mechanism

CLARIFICATION: I left out a very important detail I'm looking for a way
to do this with Pro|E Mechanism Connections. I could just use assy dims
and a relation, but I'd rather be able to drag the assy if possible.

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Doug Schaefer | Experienced Mechanical Design Engineer


You should be able to do it with Sliders and then define a couple of gears
(Rack & Pinion). I have not used WF2 in a while but if I have some time
tomorrow I will try to shoot you an example.

Tim McLellan
Mobius Innovation and Development, Inc.

Hi Doug,

Not a quick fix for you but this can be done in Wildfire 5.0. You know
how Mechanism Gears can set a ratio between rotational axes? In Wildfire
5.0 it can be done the same way between translational axes (sliders etc)
too. So you can let one slider move at (for example) half the rate of
another, or any other ratio. WF5 actually allows coupling of any
combination of translating/rotating mechanism axes. This works both for
dragging and any analysis type.

In Wildfire 2.0 I can't think of a way to achie this while dragging. It
can be constructed using MDO as a Dynamic Analysis with a PID force
controller. A force can be constructed such that it is proportional to a
position error (desired minus actual position). But if you just want to
see the desired motion, you'd probably be better off just applying
Servos to make it look right. That would not work for dragging

Best regards,



Attached is an example of what you are looking for in WF2. It does involve
the use of an extra part for the driver. As Petter mentions this is much
easier in WF5.

The small assembly includes four parts: Tube(1 ground,2,3) & the gear
driver. Each tube is assembled using a slider joint (with limits applied in
mechanism). The gear driver is assembled using a pin joint.

In Mechanism, the gear drive is used to apply a rack & pinion gear for each
of the tubes (2,3). The gear diameter for tube 2 is half that of tube 3.
However, both 2 and 3 are ran from the gear driver joint.

Hope that helps.

P.S. Regen limits setup to force full extension when regenerated in

Tim McLellan
Mobius Innovation and Development, Inc.

It should be noted that the gear method is ideally used if you want to create a specific dragging ratio between the assembly components. For most telescoping parts, which physically behave as sliders and not gears with teeth in reality, then a slider mechanism by itself should be used. This will create a much more realistic model of what you are trying to create, since you can drag the intermediate pieces back and fourth like you could in the real world.