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Design with linear actuator. Question about revolutes, sliders, and fastened mates

tim_horton406tim_horton406 Member Posts: 6
edited November 29 in Using Onshape

I'm working on a design for a linear actuator driven vesa 100 touchscreen mount that will tilt the display from 20-40 degrees using a DPDT momentary-on switch. The linear actuator, ECO-WORTHY, 12V, 2 Inch Stroke actuator has internal limit switches at each end of its stroke. I've modelled the ViewSonic touch display, linear actuator, and its mounting brackets. I have the actuator bracket position fixed, with a pivot point where the actuator connects to the bracket. The actuator has a 2-inch stroke which I model with the slider. The end of the shaft is connected to another bracket at a pivot point with the shaft being the fixed point.

1. After I complete the model, is it possible to simulate the operation of all the moving parts, if they're properly constrained, with the free version of Onshape? Currently I can exclusively activate either one of the revolutes or the slider. I was hoping that activating the slider on the finished design will show the tilting of the touchscreen display with the actuator bracket pivot points rotating as necessary.

2. How do I connect the end bracket to the shaft with a revolute, while keeping the shaft from separating from the bracket when I use the slider? I looks like I can only use one type of mate at a time.

Here's a link to my assembly document:
https://cad.onshape.com/documents/45f63a8eab3d37d0eea4a6c1/w/c2ff16dc76704416571c6a09/e/adc2756c3d4c4cf35ccbd4e2

I suppose you can ignore the movie I've uploaded and open the model and try the sliders and revolutes yourself. I am a new user (3 days now) and have worked through the Intro to CAD tutorials so far.

Thank you,

Tim

Answers

  • eric_pestyeric_pesty Member Posts: 1,926 PRO

    Can't really tell what's going as everything is moving around in the link you shared. That said if you were trying to get this to "work" in a higher level assembly, you are likely running into constraints fighting each other. For example you might need to set the slider to a cylindrical mate and one of the revolutes of the brackets to a cylindrical as well.
    For something like this I probably would leave one of the brackets "free" (i.e. not mated) in the actuator sub-assembly and then mate it to the part it mounts to in the higher level assembly. The +/- 10deg limits on the bracket might also be causing issues and shouldn't be needed…

  • glen_dewsburyglen_dewsbury Member Posts: 807 ✭✭✭✭

    To animate you'll need some additional info. Linked doc will animate.

    I drew in some parts to make it work but a master sketch inserted in assembly might be better with parts generated after motion is finalized.

    https://cad.onshape.com/documents/d3300576bd987f0466f4b503/w/7b3501377cbb4ac2adb43384/e/605e202595483a426a28e742

  • tim_horton406tim_horton406 Member Posts: 6

    Thank you for taking a look. Sorry about the movement of parts… I wondered if the link shared was to a static version of the design or not. Let's take this one step at a time, how do I connect the bracket to the end of the shaft of the actuator so it stays connected when I use the Actuator Shaft Slider? I created a pin and inserted it through the bracket and the shaft with a fastened mate, but when I retract the actuator shaft, the bracket does not move with the shaft.

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