UNABLE TO FIND UNKNOWN TORQUE - please help

[DaveDavidson1]

Hi All 🙂
I started to learn Inventor a while ago and for the past few weeks I am really struggling with my assembly. (see pic and attachment)
The idea is tu turn the screw to move the torch arm up and down roughly 3 degrees each way.
I can get the lead screw to turn and move the assembly but so far have failed miserably to find the required torque to turn the screw. I tried with both Output grapher (values returned unusually high) and unknown force feature (couldnt get this to work at all 😞 )
The end of assembly weighs 3Kg which I referenced as the external force.

The unknown force keeps telling me to lock the DoF's but when I do the assembly wont move 😕

Could someone pont me in the right direction pretty please

[JDMather]

Before moving on to an advanced topic like DS, I would want to master the modeling environment.

I opened one of your part files and found that Sketch1 was not costrained and did not have any dimensions?

There were also several errors indicated in the feature tree?

[matthewbrindley]

try this web site for torque http://www.engineersedge.com/calculators/torque_calc.htm

T=c * D * F

With the pivot point so close to the actuator the force will be a lot higher than the 3kg load on the end.

You could put your actual values in the calculator and see if it looks reasonable.

[JDMather]

What is the purpose of the 3 Move Face features at the end of this feature tree?  (Why 3?)

[DaveDavidson1]

The design had to be changed several times, guess I should have just changed the first "extend face" - Mea culpa for messy assembly, is this the reason why I am unable to find the torque? I started to use Inventor just over 2 months ago and I am learning on my own.
I can use the formula but the idea is to learn how to use the Inventor to do it.
Could you please advice on a way forward and what needs to be fixed apart from the errors visible in assembly tree, in order to solve for torque?

[JDMather]

Are you aware that you can right click on a feature and select Edit Feature and change the distance?

Have you installed Service Packs 1 & 2 for 2014?

[JDMather]

What process will you use to get this threaded rod into the threaded hole?

[mcgyvr]

---

@Anonymous wrote:

What process will you use to get this threaded rod into the threaded hole?

---

BFH (Big F'in Hammer) process 🙂

[DaveDavidson1]

Thank you, already done the calc on paper but I need to  learn how to do it in Inventor.

[DaveDavidson1]

Right, Fixed the errors and made the thread full length but tbh thats not why I coulnt solve the thread torque problem. To get the thread in I would either constrain the axis or use cylindrical joint to provide for thread joint in DS, but I get the jist guys and thanks for all your kind and helpfull comments.
Apologies if the question was not expert enough for you.