Questions tagged [linear-motion]

The tag has no usage guidance.

36 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
5 votes
1 answer
633 views

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 ...
PSz's user avatar
  • 93
2 votes
2 answers
395 views

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 ...
kp122's user avatar
  • 31
2 votes
1 answer
167 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 ...
Bob Kim's user avatar
  • 21
1 vote
0 answers
38 views

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 ...
Norman's user avatar
  • 11
1 vote
0 answers
183 views

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-...
Raymond Zheng's user avatar
1 vote
0 answers
44 views

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)...
Daniel T. Simpson's user avatar
1 vote
0 answers
83 views

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 ...
Dr. Cyanide's user avatar
1 vote
0 answers
171 views

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 ...
Aayvu.com's user avatar
  • 163
1 vote
0 answers
211 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 ...
Liam Owens's user avatar
1 vote
0 answers
75 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 ...
Ava's user avatar
  • 125
1 vote
0 answers
26 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 ...
Ben's user avatar
  • 121
0 votes
0 answers
11 views

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 ...
Asmaa GZ's user avatar
0 votes
0 answers
71 views

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 ...
Hansen Micheal 's user avatar
0 votes
1 answer
35 views

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 ...
Ojasvi Srivastava's user avatar
0 votes
0 answers
35 views

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 ...
Phazis's user avatar
  • 1
0 votes
1 answer
46 views

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 ...
Bob's user avatar
  • 1
0 votes
0 answers
47 views

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 ...
Yassin's user avatar
  • 1
0 votes
1 answer
91 views

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 ...
Chris James's user avatar
0 votes
0 answers
31 views

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 ...
Jeremy Herrman's user avatar
0 votes
0 answers
14 views

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 ...
TheCodeNovice's user avatar
0 votes
1 answer
115 views

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{...
Tanvi Sawant's user avatar
0 votes
1 answer
33 views

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 ...
Mark's user avatar
  • 1
0 votes
1 answer
77 views

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 ...
belza00's user avatar
0 votes
0 answers
27 views

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 ...
Sergeant Afanasiev's user avatar
0 votes
0 answers
36 views

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 ...
Marcos's user avatar
  • 1
0 votes
2 answers
1k views

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 ...
S R's user avatar
  • 1
0 votes
0 answers
34 views

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 ...
Renoldus's user avatar
  • 101
0 votes
0 answers
112 views

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 ...
AlanZ2223's user avatar
  • 163
0 votes
1 answer
90 views

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 ...
talneyjonno's user avatar
0 votes
0 answers
278 views

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 ...
gunfulker's user avatar
  • 133
0 votes
1 answer
37 views

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 ...
obious's user avatar
  • 101
0 votes
1 answer
239 views

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/...
James Loughlin's user avatar
0 votes
1 answer
118 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 ...
David F.'s user avatar
0 votes
0 answers
28 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 ...
Kestis's user avatar
  • 1
0 votes
0 answers
207 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 ...
Frost's user avatar
  • 1
0 votes
1 answer
272 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 ...
Harvey Fletcher's user avatar