Questions tagged [linear-motion]
The linear-motion tag has no usage guidance.
36
questions with no upvoted or accepted answers
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Quick return mechanism for spring-loaded screw
I am 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 ...
2
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2
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395
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How to solve this linear motion problem?
Context:
I have a lead screw rod, nut and a pulley aligned vertically. The nut is attached on top of the pulley so their respective bores are aligned and the rod is arranged so that it is threaded ...
2
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1
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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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0
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Is there a rotational-to-linear machine that doesn't allow the slider to impart torque while _between_ extremes?
Consider a machine for converting rotational motion to rectilinear translation, such as a crank slider or scotch yoke.
When the slider is at either of its two translational extremes (where the crank ...
1
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0
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183
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Lifting a table using linear rails and linear actuators
I'm trying to design a coffee table for a tightly constrained space that can lift up to become a dining table. I've drawn the CAD for this design, but I'm concerned that the moment arm on the linear-...
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0
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44
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How do you make custom springs and where could you buy them?
A friend and I are working on a combat robot that uses a special drive. This drive requires a spring with a large wire diameter (over 3mm), a large outer diameter (40-70mm), and a large pitch (60-90mm)...
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83
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How can you convert 180 rotation into two separate motions?
I have a small servo that can rotate 180 degrees. I would like to get two different connected parts to move at different times, one part moving while the servo is between 0-90 degrees, the other part ...
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171
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Is it possible to have the load cell signal as feedback to the servo drive of the servo motor?
In my project, I have to control the linear motion in one of the two modes. It will be either in position control or load control.
for the displacement control, The servo motor takes the quadrature ...
1
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0
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211
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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
...
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0
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75
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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 ...
1
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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 ...
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Autonomous vehicle lateral control
I am working on a control system for autonomous vehicles, i am using a kinematic bicycle model simulated on matlab simulink and the formula i used for the steering angle is given in the figures below ...
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71
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VDI Guideline 2143 Sheet 1: Motion rules for cam mechanisms; theoretical fundamentals
Hello Motion Control Enthusiast, I am a motion control student, and looking for your suggestion for a Free downloadable English-translated version of VDI Guideline 2143, theoretical fundaments of cam ...
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35
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In a lead screw mechanism with a fixed travelling nut, will the screw and its driving mechanism move instead?
https://www.youtube.com/shorts/tUkkOStjz8o
Imagine this but upside down.
Since the platform bolted to the travelling nuts will be pressed against the ground and will have nowhere to go, I reckon the ...
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35
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Accelerate an object in a current-carrying coil
I'm currently trying to come up with some concept ideas for a physics game / riddle. The player has to get an object from one side of a horizontal, current-carrying coil to the other end of the coil ...
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1
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46
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Reciprocating motion in alternating tracks
I’m trying to find a solution for a simple feeder mechanism where a spring-loaded ”piston” gets pushed in a linear motion, and then on the way back it switches to parallel track, enabling it to be ...
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47
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High speed linear actuator/motor design
I need to make a linear actuator to compress a spring 80mm in 0.1 seconds. This is a speed of 1600mm/s. It takes around 15kg of force to compress the spring. How can I design a linear actuator for ...
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1
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91
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Using a Lead Screw To Create a Two Stage Clamping System
I want to use a motor to drive a lead screw that first brings down a platform that locks into place and then controls a secondary platform to apply pressure but using only a single motor.
As an ...
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0
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How to design a fast moving tilt table capable of lifting and holding 35kg/75lb?
I have a rectangular table about 0.5m(20") x 1m(40"). I need to lift one end of it, similar to a tilting table using something like a linear actuator (think CNC Z-axis).
The load is fairly ...
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Confused about connecting slider mechanism to flanged ball nut
This is probably a really basic questions but for the life of me I cannot figure out how to proceed.
I need very smooth and precise motion over a short distance ~2inches, but it needs to be fast since ...
0
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1
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115
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Rotation of point in 3D space
I want to rotate a point (3,4,5) by an angle 45 degrees(0.785398 rad) in 3D space. I have used the standard DCM matrix in the order Rx, Ry and Rz.
Where,
$\theta = 0.785398 [rad]$
$$ Rx= \begin{...
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1
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33
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Looking for a mount with 3D play to it
I'm building a lift bed in a van. The basic idea is that each corner of the bed is mounted on a linear track actuator, bed goes up, bed goes down.
I want to be able to control each actuator ...
0
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1
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77
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Looking for a linear actuator that can carry a transverse load? Does such a product exist?
I am looking for a product that works like a linear actuator where you can control how far it extends but it can also hold a transverse load at the furthest point of extension.
What I am looking for ...
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To design the system of a rectangular small shaft moving in and out in a completely mechanical way without remote control
In my setup , I have designed a system in which a body will rotate and execute rectilinear motion down the screw along its thread . upon reaching the bottom most point I want to make a system in which ...
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Design of a linear actuator that is only 5 mm wide
I have to design a linear actuator with a maximum movement of 3 cm back and forth and a maximum force of 5 N. The only constraint I have is that it can only be 5 mm wide. There's no real constraint ...
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2
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Spring and damper in series, equation of motion
For the motion in fig 4.1 (a), please check the description of this system in the images above, everything should be there. I get it, assuming the positive direction is downward, the spring tension is ...
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I'm trying to understand an equation from a motor simulation $\dot w_i (u_ i ,w_i,l _i , \dot l _ i )$
I have a simulated motor and I'm not understanding the math to control it.
This is the equation for the force of the motor, also called an 'actuator'.
$\dot w_i (u_ i ,w_i,l _i , \dot l _ i )$
w ...
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112
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Retractable linear mechanism with a retractable drive for servo control
I am considering a mechanical system that is able to retract and extend via servo control but with the drive mechanism being retractable itself. Doing so I will be able to have a multiplied retracting ...
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1
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90
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Help with design of linear actuator
I am working on an automated gate positioner for a drill press. This gate will move back and forth by a set distance so lining up the drill press is automatic.
I have tested with the Z axis of a cheap ...
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278
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How much force can an acme lead screw handle?
I have a stepper motor that claims 425 oz*inches torque. I want the lead screw to span 2' supported on both sides. I'm trying to decide what diameter lead screw is strong enough to not be damaged by ...
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1
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Calculating Gearing Ratio from Constrained Rotational Linear Arc and Horizontally Opposed Rotation
I'm 3D printing an aircraft throttle unit as a POC and am trying to calculate the gearing ratios that are required in order transfer the full range of linear motion into a directionally opposed sensor ...
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239
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Linear Motion Stage with Offset Loading Problem
I'm currently developing a linear motion system which will have to withstand a large offset load (see image below). There will be two rails, each with a carriage on, which will be connected by a beam/...
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1
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118
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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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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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207
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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 ...
0
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1
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272
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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 ...