Questions tagged [linear-motion]

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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 ...
Phazis's user avatar
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1 answer
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Method to achieve a constant force no matter the actual velocity when under load

So, this might be a somewhat strange need, as I don't seem to see many resources on this. I'm trying to create a device where I can set an amount of force for it to generate, and when it would behave ...
Jason Long's user avatar
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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 ...
Bob's user avatar
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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 ...
Yassin's user avatar
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1 answer
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Linear actuator that extends more than its retracted size

I'm trying to build my standing desk and has been studying a lot of them, but have not found a CAD or Technical Drawing of them mechanism. Obviously, as an Engineer, I assume that it uses a Lead Screw ...
Italo Guedes's user avatar
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2 answers
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What motors would be suitable for linear actuation in 1-2mm footprint?

I need to control simple braille (text for blind people) array with tiny rods. I don't necessarily have to control the precise location. A linear actuator with on/off states would be enough. However, ...
Genom's user avatar
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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 ...
Chris James's user avatar
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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 ...
Jeremy Herrman's user avatar
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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 ...
TheCodeNovice's user avatar
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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 ...
Norman's user avatar
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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{...
Tanvi Sawant's user avatar
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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-...
Raymond Zheng's user avatar
1 vote
2 answers
79 views

Driving an air cylinder with ignited hydrogen/oxygen gas mixture from fuel cell?

Summary: I need to build a linear actuator that has a very fast actuating speed but fits in a very small space. My Question/Idea: Electric gearmotors, c02, and air pressure, are all ideas that come to ...
dutenh's user avatar
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Backward stabilization of a Z-axis

I'm trying to build a Z-Axis for mounting a camera to it. Overall weight would be around 20-30kg that's needed to lift. Now I'm struggling at a certain point of decision. I have 2 HGR20 steel linear ...
user3435167's user avatar
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2 answers
542 views

Simple mechanism to convert linear motion into 180 degrees rotation

I want a simple mechanism to rotate something 180 degrees when another thing moves linearly past/through it. The below is what I have, but it can only work with an offset, so the movement is never ...
Oliver Walters's user avatar
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Determining time and distance constrained S-curve motion profile

I am attempting to determine (symbolically) the required motion profile for a servo-driven system given three critical parameters: dx - The total displacement of the target material T - The time in ...
buddeiw's user avatar
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How to achieve sliding motion like this between two blocks?

I want to make a construction of two boxes, that by default would be stacked one on top of the other, but linked in a way that would allow the top box to slide off and then move down so that they are ...
Mroova's user avatar
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Understanding the importance of 'pitch': For ball screws and timing belts

I searched here and even asked at McMaster-Carr, but even they couldn't provide an answer for me-- So, say you have either a ball-screw, or a timing belt-- Of course, in either case, having the right ...
Nevermnd's user avatar
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Determining the balancing force for a system of unequal masses for given scenario (angular-momentum, moment-of-inertia, thought-experiment)

Have already asked this on physics-site but has been closed. As such trying here! This question is basically a thought experiment. Let's say there are two pulley's P1 and P2 having equal radius R and ...
Ravindra HV's user avatar
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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 ...
Mark's user avatar
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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)...
Daniel T. Simpson's user avatar
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1 answer
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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 ...
belza00's user avatar
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2 answers
78 views

How do linear guides work?

I am new to the office and I wanted to ask about linear guides like shown in the picture: (source: https://www.nskeurope.de/de/linear-motion-control/products/linear-guides.html) Are the carriages able ...
n328's user avatar
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Differential Drive Kinematic Constraint Determination

I'm working through a paper to better understand Differential Drive Mobile robots and I'm a bit stuck(fairly early in the paper) on how one of the constraints is derived. The paper is here, https://...
Lysford18's user avatar
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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 ...
Sergeant Afanasiev's user avatar
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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
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2 answers
546 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
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1 answer
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how are larger leadscrews (14mm diameter and up) fixed in place?

So looking at 12mm lead screws and below, it seems like a common method for fixing them in place is to use pillow blocks. The pillow block has set screws which clamp onto the lead screw, and you're ...
gerrgheiser's user avatar
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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 ...
Renoldus's user avatar
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Is there such a thing as a double roller/bearing? Two rollers/bearings that share one axis, but can roll independently. [linear/pivot]

I'm looking for two track rollers or bearings that share an axis, but can roll independently of each other. Ideally, they are compact as well ($\leq 1 \text{ in}.$ diameter) and can handle a moderate ...
joseville's user avatar
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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 ...
AlanZ2223's user avatar
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1 answer
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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 ...
talneyjonno's user avatar
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1 answer
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How do I calculate the total force required for a linear actuator? [closed]

How do I calculate the total forcerequired for a linear actuator? The image enclosed shows a series of door panels, each with a cam that i would like to connect to a linear actuator on the right hand ...
Daniel Hanson's user avatar
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1 answer
58 views

Motor Power for vertical lift in linear slide mechanism

I want to pull up and down 10 kg metal cylinder at 7 inch vertically by using linear slide mechanism in 1 second. What should be the motor rpm, gear type, torque, watt etc? Otherwise how to calculate ...
XO56's user avatar
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1 vote
3 answers
994 views

Ideas for mechanism for quick reciprocating motion - a 'truly' mechanical switch

I need a mechanism to switch the vertical position of an assembly in as square a profile as possible - i.e. a normal crank mechanism produces a sine wave profile, to explain myself better. I've seen ...
Oliver Walters's user avatar
2 votes
1 answer
271 views

Raise/Lower 350lb Sawmill Head 12v Motor Specs

I am new to this site and have a problem to solve in an area that I’m pretty lost in. I can usually figure stuff out with the help of the internet and some digging but not getting real traction so ...
SawmillBuild's user avatar
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1 answer
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Linear solenoid mount

I have a linear solenoid with a tapped M3 hole at the end of the plunger, like this: I need to connect this plunger to a lever, so I want to add a mount which has a connection something like this: ...
Orlando Alexander's user avatar
1 vote
1 answer
90 views

Linear motion with triangle profile

I am looking for a way to generate a linear motion with a triangle motion profile for my hobby project. The travel distance should be 6cm (so 12 cm for round-trip) with constant speed 1.2 m/s or ...
pika_pika's user avatar
1 vote
2 answers
125 views

Is a pneumatic cylinder in general a linear or rotary actuator?

I've just begun to learn pneumatics and I'm really confused where the pneumatic cylinder falls under in the categorization of what kind of mechanical motion it is suppose to produce. I've seen one ...
AndroidV11's user avatar
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2 answers
3k views

How do I calculate the ideal travel distance of the ball screw per revolution of the stepper or per step for the following hardware?

Question How do I calculate the ideal travel distance of the ball screw per revolution of the stepper / per step for the following hardware (I believe this is called the lead)? Background I have a pre-...
Sneaky Puffin's user avatar
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1 answer
67 views

If aboard a train being driven along a track by centripetal force, would it feel like you were on a regular straight track?

Question: If aboard a train being driven along a track by centripetal force, would it feel the same as if you were on a regular straight track? I hope this isn't subjective, I think there is a right ...
David Nolan's user avatar
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217 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
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3 answers
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In circular motion , why do we say this is centripetal acceleration

Let us say a particle is moving in a circle with Uniform circular motion . Then , if I take an equation like this . $\theta$ = S(Arc length or Total distance covered ) / Radius of circle *( time ...
S.M.T's user avatar
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1 vote
2 answers
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Did not understand this regarding angular velocity

It says $V\sin \alpha$ (component of velocity perpendicular to OP) is the cause of angular displacement. How is it? if only $V\cos \alpha$ existed, we need not turn over head to always to look at a ...
S.M.T's user avatar
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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 ...
obious's user avatar
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1 answer
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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/...
James Loughlin's user avatar
2 votes
1 answer
180 views

Single linear actuator lifting mechanism

I have inherited a DIY build and I have some doubts about its design. Have a look at the following diagram: 1 is the linear actuator. It's quite beefy 2000 lbs 12" stroke. It is installed in an ...
John Lane's user avatar
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1 vote
1 answer
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CNC side linear rails

I've been wondering why most (hobby) CNC machines have two actuated linear rails like this: Besides the extra force for moving the spindle, is there a need for both rails to be actuated? Could the ...
John M.'s user avatar
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4 votes
3 answers
410 views

Off-centre actuation

I'm trying to lift a platform with several guides using a linear actuator, but off the centre as follows: The load on the platform will be around 100kg, which is just within the linear actuator's ...
John M.'s user avatar
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5 votes
2 answers
910 views

Lifting a cabinet using actuators or scissor lift

Disclaimer: I am not an engineer - just a DIY guy looking for some advice or help please, so please forgive me if I use incorrect terminology :) I am building a cabinet that has a hidden inner cabinet ...
maGz's user avatar
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