Questions tagged [linear-motion]
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21
questions
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1answer
17 views
Ceiling Mounted Camera Slider with Pan
I am looking for feedback on my camera rig design. I am going to run a track along the ceiling of my studio to move my camera back in forth. I also want the camera to be able to pan, so I want to ...
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27 views
Using carbon brushes on linear guides
I’m designing a machine which has an actuator on a carriage sliding on two round linear guide shafts. I got an idea of transmitting electricity to the actuator through the shafts. There would be ...
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14 views
Hydraulic Cylinder comparison to electric Linear Actuator
I am trying to build a juice press using an electrical linear actuator, instead of a hydraulic car jack (bottle type). If I build it with the hydraulic cylinder I would need a 5 Ton bottle, which ...
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2answers
171 views
Rotary to linear motion - how to make upside down “hammer” mechanism?
I’m not an engineer, however I think this place is the best one to find an answer to my question.
So my problem is as follows: I need to create a mechanism, preferably driven by a dc motor, that will ...
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0answers
27 views
Equations of motion for a motor supported by a spring resting at the centre of a beam
Assumptions from this:
Sum of forces on the beam to be calculated
Sum of moments on the beam to be calculated
Sum of forces on the motor to be calculated
As:
F=-kx = kθL^2
Equations of Motion
...
1
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1answer
36 views
What lead screw to use for specific torque and speed requirements?
The setup: I'm trying to mount a leadscrew powered by this motor Tetrix Max Torquendado Motor on a 40ish pound robot, in order to lift it 4" off the ground. I already have the linear motion, latching ...
1
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1answer
48 views
Sharing load between linear actuators
I'm building a motorized standing desk and am trying to calculate what linear actuators I need. If I have 4 linear actuators (one on each corner) each able to lift 25kg does that mean that the desk ...
2
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1answer
80 views
Dynamics of a rigid body in a system of two linear drives
I've been trying to solve the dynamics of this system for quite a while, but cannot seem to get the right answer. I've tried solving it with Lagrangian method but I am not so confident with the ...
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0answers
30 views
Linear actuator calculations
I'm building a motorized standing desk and am looking into what to use for the linear actuators. I'm targeting a stroke of 450mm and a lifting force of 100kg. I found some Linear Actuator on ebay that ...
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0answers
50 views
Shaft which can independently rotate and translate axially
I would like to mount a sensor onto a shaft which can be translated axially as well rotated independently. This arrangement permits me to capture a 360 deg scan and then translate the shaft axially to ...
3
votes
2answers
609 views
Converting Linear Motion into rotary motion
I'm looking at designing something using the same mechanism used in this pepper grinder. As far as my knowledge goes, it is converting vertical Linear motion (the push button) into horizontal rotary ...
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0answers
29 views
Steering with a push / pull action. Is there an easier way?
Linked to my previous question Push / Pull Steering on an axle, I now have time and space to work on the full scale project. I have noticed an issue with the answer that is there, and that is, the ...
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1answer
49 views
Need to produce vibration amplitude of 200 um (approx) at natural (resonant) frequency, can be any frequency between 100 to 150 Hz
In order to conduct study, I need to produce controlled vibrations with amplitude (maximum) approx 200 um (micro) at frequency between (100-150) Hz. Vibration amplitude must be controlled with input ...
2
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1answer
122 views
Quick return mechanism for spring-loaded screw
Looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position.
Specifically, a screw ...
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1answer
61 views
Analytic expressions of the kinetic and potential energy [closed]
A homogeneous rigid circular disc (radius R, mass ms, center point S) rolls without a slip on a plain with a small angle of inclination alpha against the horizontal. A point mass MG is fixed on the ...
1
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1answer
616 views
Linear actuator on a scissor lifting table
I am designing a scissor lifting table and I have an issue with the linear actuator. This table should be lifting 100 kg. I studied the problem in two ways : a static study and a power study. My ...
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1answer
30 views
How can I calculate headphone driver excursion?
I'm a headphone enthusiast, and once I tried to open up my headphones to see how much they move when I play my music.
However, I was really surprised to see that the sounds that I could "feel" ...
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1answer
146 views
Push / Pull Steering on an axle
I have a base with 4 wheels, the rear axle is a motor which drives the base forward or backwards, this contains a diff, so there's no problem there.
The front axle is a steering axle like that in a ...
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2answers
60 views
What type of supports exists for ballscrews or leadscews?
For Linear actuators, a common mechanism is to use ballscrews with ballnuts.
The ballscrew is supported at the two sides by a set of bearings which permit the rotation of the screw while keeping the ...
3
votes
2answers
127 views
Simple mass spring damping system sizing K, and C factors
I have come across a problem, which has troubled me for some time now. What needs to be done is the following:
A mass on a rod 0.6m (mass less) has a mass of 1 kg attached at the end of it. The rod ...
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0answers
22 views
Linear Guidance law into X-Y axis
Im currently writing a model for a guidance law named Maintaining Guidance law.
The law looks as following: $$ a_{M} = [K_1,K_2]*[\dot{\lambda_T} ,\dot{\lambda_D}]'$$
Since im using a linear model I ...
