# Questions tagged [mechanical-engineering]

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### How do I convert horizontal inward motion to vertical downwards motion

I have a small coil gun project for which I designed a magazine to put my soft iron projectiles, my main concern is to design some sort of magazine mechanism with a safety because the “accelerator” is ...
30 views

### Screw theory for kinematics/dynamics of mechanisms

Is screw theory commonly used for general kinematics/dynamics of mechanisms (not just robotics)? I'd be interested in anything that covers the types of mechanisms you would find in a typical ...
40 views

### Degree of freedom and Grubler formula

I am attempting to apply the Grubler formula (which can be found here: https://learnmech.com/how-to-calculate-degree-of-freedom-of/), but it does not seem to yield the expected result for the ...
• 101
153 views

### How to control the position of a load shared between two (servo)motors?

I want to position-control an axis combining the action of two DC servomotors - one of them alone is not powerful enough; I had those available and preferred not to buy a new one. I have not the ...
27 views

### How to find coefficient of friction that will maximize torque?

When using DC motors with a drive wheel (aka "direct drive") to propel a vehicle (e.g. an RC car), force and torque play a role in how efficiently that motor's power is transferred into ...
• 111
48 views

### Doubt regarding publishing of robot in a journal or to be applicable for a presentation

i was just curious about publishing an abstract or stuff like that about a robot I've made all by myself . Do i really need to make a working model of it or 3d solid works or cad will be enough ? . I ...
1 vote
44 views

### What geared mechanisms can convert various weak stepper motors drive inputs into a higher torque output?

I'm interested in making an arduino robotic arm for something that need precision and/or torque (like CNC), but first, I'm exploring/searching what I would need and how much it would cost. What I ...
• 43
1 vote
144 views

### What are the pros and cons of Zip Chain Actuators in robotics? [closed]

Well, I just found out about these Zipper Chain Linear Actuators, but I couldn't find much information comparing these types to other types of actuators. For example, what is the performance of Zip ...
• 43