Recent content by magicfrog

I probably didn't express myself clearly, and I apologise for that. Everything will be managed by an external action. For example, I pull the stem to accumulate and store energy, disengage the stem and continue my run. I push the stem to engage it again, recover the stored energy and express it.

I was thinking about a nested system of cylindrical cams. At least two driven by the same linear stroke of the rod. The outer one would rotate the collar and position it in a stop position relative to the spring thrust, and an inner one would decouple the rod in a second consecutive moment. In...

Yes, I thought about something like that too. But how would you rotate the key? With an external action? Or always with a mechanism linked to its single linear stroke? Basically, it should be something reversible, in the sense that what happens on the forward stroke must also happen on the...

The rod can only translate linearly by a given number of millimeters. However, nothing prevents adding a collar that can rotate while the rod translates, so you can engage and disengage the mechanism. Were you thinking of a barrel cam?

I think that kind of mechanism is a push/pull mechanism. To enable the free travel, I need to push in one direction to release it in the other. Unfortunately, in my case I only have a linear stroke, with no possibility to implement a push/pull mechanism.

More specifically, the idea is to have a linear mechanical system that, during the forward stroke, activates mechanisms needed to: store energy (compress the spring), retain it (mechanically lock the spring plate), disengage the rod so it can continue the stroke freely. During the return...

Hi everyone, I tried searching the forum but couldn’t find anything directly related. I’d like your opinion on the existence or feasibility of a mechanism concept I’d like to explore. I’m attaching a rough 2D sketch and I’ll try to be as clear as possible. Imagine a rod that must perform a...

I'll try again. I'll try again. I hope it's more visible.

I will try to repost my solution with a higher resolution. Yes, the triangle AH, HB and BA is a rigid triangle. You can imagine it as shown in the attached image. B and H are not on the same vertical line and the rod is not parallel to the axis of the sliders.

I just need to express the various distances in terms of lengths and angles.

Hello everyone, I've thought about it for a while and have come up with this solution. I would like to discuss it with you to see if there are any fundamental errors in the process or if it could work. I am attaching my assessments. Thank you very much!

Yes, I have all the necessary data. I would like to be able to write the torque in node F as a function of the parameters in the attached diagram, i.e. force, dimensions and angles.

I would like to add that the kinematics are placed on a horizontal plane, so the applied force (W) is orthogonal to gravity. I would like to take this opportunity to add another consideration/question. For the purposes of calculating the torque in F (dependent on angles, levers and force)...

Good morning everyone, I am currently working on a kinematic problem that I am having difficulty solving. I have been asked to calculate the torque at node F based on the geometry and the force (W) applied at node G in the AG direction. In particular, node G and node A can translate along the...

This only means one thing, considering thermal effects negligible implies considering a fluid non-viscous. Correct?