Questions tagged [mechanical]
The mechanical tag has no usage guidance.
194
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Question about dynamics n-t coordinate system
et = tangential unit vector
en = unit vector in normal direction
I'm currently studying dynamics and I'm having difficulty understanding the process of obtaining det and det/dt in the n-t coordinate ...
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Is it possible to keep radius of rotation the same/constant while angular velocity of a rotating object stuck to the rope increases?
Under no gravitational effect, there is a rope fixed in the center of a table, and an object rotates with the end side of the rope. Let's say their current radius of rotation is "R".
If ...
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High or low friction on a sprocket/chainbelt drive
We have a segmented belt/chain drive. Both the belt/chain and sprocket are nylon and we have issues with slipping on the sprocket. Would a material change help or do we just need a better tension ...
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Coupling suggestions required
I am looking for a Hub-Shaft coupling which has no alignment error (angular as well as parallel) and can be used for a fixed axial distance. No misalignments can be ensured by PL032X050M but in order ...
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Inertia calculations of planetary gear given below?
We are basically working on rotary pick and place mechanism based on working of gear mechanism with some modifications.
Check the picture
There are three planet gears which are attached to a carrier ...
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Acceleration of servo motor with AASD-30A
I am using a servo motor 130st-M15015LB with the AASD-30A driver.
I have to use the acceleration with position control mode.
I can see in the documentation that If I use Pn110 to Pn112, I can have a ...
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1
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29
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Stepper motor response under varying load
I had a thought that came to mind that made me curious-- Though unfortunately I am not an ME.
I was wondering if someone could assist me in working through my thinking, but you will have to be gentle ...
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What is the purpose of the additional metal bar on the latch bolt(tongue)of the door lock?
Hi.
As you may see at the photo,the tubular latch
has a triangular metal and a thin half cylindrical piece
of metal next to it.
The purpose of the triangular one is obvious,but
What is the purpose of ...
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63
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2-speed 2-direction gearbox design
I need to design a gearbox with the following properties:
The direction of rotation is maintained between the input and output shaft
The input shaft can be rotated in one direction for one gear ratio ...
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77
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What will the reaction forces of a support be in case of an angled cable
If a cable is attached to a support on each side, and there is a load acting on it somewhere along its length.
Is there going to be a vertical reaction force only if the the cable is angled?
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The knee gives a mechanical advantage point for the leg, would a "reverse knee lever" also work?
As shown in this video, the simulated knee cap creates a fulcrum that allows for a better mechanical advantage for the muscles to pull the leg.
So I was wondering if the reverse would also work, or if ...
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How to keep a stationary motorcycle handle in the forward direction
How to keep a stationary motorcycle handle in the forward direction if no force is applied to rotate it. I have seen such motorcycles in Arcade Game Parlours but I want to make such one for myself.
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How to align a shaft with gear box and mechanical seal and uc bearing?
I have a 15 inch (381 mm) shaft with 24.95 mm diameter. That shaft is attached with a gearbox (ratio 5:1). The gearbox is driven by a motor (rpm 2750). There is one UC bearing and mechanical seal and ...
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Which tool to measure shaft alignment for small diameter shafts (d=10mm)?
I have seen many tools and methods to check shaft alignment, but they are mostly used for big shaft. I wonder if there are small tools for small diameter shaft with limited space to install?
Can you ...
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Which ANSYS modules do we need if we want to do the coupled simulation of motor?
There are more than electromagnetic field in real motor running, for example, the electromagnetic field will couple with temperature field and the fluid field of cooling fluid will affect the ...
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77
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Torx, Hex, Philips or Slotted screws
I mostly use M2.5 size screws. I got some brand new Torx screws but when I tightened them for the first time, either they stripped or the bit of the screwdriver got twisted. What could be the reasons? ...
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How to affix a 3/4" keyed bore wheel/pulley to 5/8" D-profile shaft?
How do I affix a 1.5-inch-thick wheel with a 0.75-inch keyed bore (or pulley) to my motor's 1.25-inch-long x 5/8" diameter D-profile shaft (both pictured)"?
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DC Motor - need to go to 200-10,000 RPM
I'm currently working on a setup with Raspberry Pi, a 12 V DC motor and a L298N driver. I need the motor to go from 12000 RPM to 200 RPM, or at least in that range - the only problem is that the L298N ...
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hydraulic pressure per cylinder, see below
when providing 2800 psi pressure to 6 hydraulic cylinders with .196 area of each cylinder what is clamping force on each cylinder. F=Pressure *area so 2800 x .196 is 548.8 psi or is it 548.8 /6 = 91,...
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Compound Machine with Worm and Worm Wheel Drive Velocity Ratio
I'm having trouble understanding the working principle behind solving this worm drive. Here's the question:
A double threaded worm and 40-tooth worm wheel are used to drive a mechanical winch. The ...
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Scissor mechanism won't budge with slotted pin
I am looking to better understand why this scissor mechanism so easily moves by directly pulling on the lift...yet, seems incredibly difficult/impossible to move via the attached point in the slot?
...
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How does this pawl mechanism work?
From 507 mechanical movements, No. 63, we get the following diagram and description.
Jumping or intermittent rotary motion, used for meters and revolution-counters. The drop and attached pawl, ...
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how to fix an object at either 90degree or 0 degree
my problem is i donot know how to let the blue colored object be fixed at either 0 or 90 degree.
i dnot want to be moveable at any degree like 30, 40 , or 50 degree either 0 or 90 degree.
i have tried ...
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Vertical offset milling
Is the direction of rotation of milling cutter for offset vertical milling specific? Like should the rotation be in CCW direction when the offset is above the axis of the workpiece? material?
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Wind-up toy car constant speed problem
Set Up: In a classic wind-up car we store energy in spring. The energy then used unequaly in time resulting variable speed during the ride. Max torque and power and acceleration at the begining, with ...
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2
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Strain As A Function of Deflection of a Hollow Cylinder
I should think that there would be a direct correlation of strain to deflection of a hollow thin-walled cylinder, but I've seen nothing as of yet. I must be missing something. For example, let's say I ...
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why does the Bugatti Chiron watch w16 animation only last 20 seconds? [closed]
why does the Bugatti Chiron watch w16 animation only last 20 seconds and not more?
why doesnot it last more is because lack of energy from the mainspring ?
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What is this spring known as?
Could anyone tell me what the spring part of this component is called please so I can source something similar?
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How to pull a component through a panel cutout using a screw mechanism?
I have a camera fixed to a cube frame structure made from aluminium extrusion. The frame will be covered by a 3 mm thick fibreglass enclosure (this is highly rigid) with a cutout for the camera, which ...
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how to let a needle move in positv roation and then a negativ rotaiton then it should loops [duplicate]
i am trying to make a watch that looks like the speedometer from merceds benz AMG
my problem is i canot figure out how to let the needle or the minute hand (call it what ever you want) rotate from 0 ...
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How can I make a needle to turn slowly CW to the final position, then return quickly CCW back to the initial position and to start again turning CW?
What I want is after the needle reaches 60 it should go back to 0 in the way showed in the image
The mechanism should preferably be based on gears which convert a steady continuous rotation to the ...
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Calculation on gearbox design
I want to design a gearbox of 70hp input motor and speed of 1400rpm. The gearbox ratio is 1:10 of 2 stage parallel arrangements.
How do I calculate for the teeth, modules and other requirements ...
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2
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73
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Remove stripped screw inside of a tube
I have a stripped screw inside of a tube (see picture):
The size of the screw is M2 and it seems to be glued. This is part of a camera objective so I want to avoid impact (e.g. tapping with a hammer)....
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What are some interesting applications of G2/G3 Continuity? [closed]
I've heard of CNC tool paths using splines to approximate G2 continuity to create smoother motion.
Also, rollercoaster designs use G2 continuity to reduce shock from sudden changes in curve radius ...
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Failure criteria for CFRP single plate bolted joint
Which equation can be used to find failure based on ply orientation.
Tension,shear & bearing faliure to validate against fem analysis
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How does the retrofit mechanical system work in the rear brake pistons of cars (dual hydraulic + mechanical)?
I discovered recently (when changing the rear brake discs/pads of a car) that the piston cannot be pushed back without setting a rotation to it in the same time.
This is due to the dual system with ...
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How can I understand shear flow in a beam cross section?
I am trying to understand shear flow and I am just not getting it. For example, one of the problems in Beer has an I-beam and there is both a horizontal and vertical force acting on it. So it has ...
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Clarification of a piston and crank dynamics question
Yesterday, I had an Engineering Mechanics exam which involved a Piston and a Crankshaft engineering dynamics problem, which I was a bit stumped about. I sought clarification from the teaching staff ...
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Is there a geometry that meshes exactly with a rope?
I'm in a use case where the outer surface is a gear driven by a motor (that's the easy part) and the inner surface meshes with a metallic (iron) rope. When the part rotates, I want the motor and ...
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What are the different ways to measure mass, for mechatronics
I’m trying to build a small mechatronic device and want to know the different ways of measuring mass. The ones that I’ve found so far are vibration and directly measuring mass using weight or a scale.
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Why were handcuffs ever made with a chain between them?
I've noticed that modern handcuffs are always attached directly to each other, without any "chain" of any length in between. I guess I can understand why that make them safer and more robust....
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What would I search for to find a combination of a cap screw and a set screw?
I'd like a (hex) cap screw that at the non-head end has a (smaller) keyed opening, allowing tightening the screw from the inserted end (because the screw will be into a threaded hole with an open end, ...
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What type of ball bearing is this?
I don't have engineering background. I'm looking for this telescope' altitude bearing below. I understand it's a type of ball bearing, but does anyone know the exact name of this type?
There are 2 ...
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Incremental rotation that snaps in place
I'm developing a board game and it needs a mechanism of incremental rotation in which the rotated object will snap to one of five possible angles. I have been trying to search for examples of ...
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Connection to periodically electrify equipment
I am designing a system where I have a set of 4 electrical components rotating in a circle. In the bottom stage, the electrical component is submerged in water. In the top stage, the electrical ...
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How to make a circle spin from the edges
I have an issue where I need to make a large wire through a bearing spin in 3" diameter circles, and have a weight hanging from the bottom of the wire. Essentially, I need a hole that moves in a ...
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I need a coaxial gearbox that translates reciprocating clockwise & counterclockwise rotation to unidirectional while increasing speed of rotation?
I am a noob engineering student. I want to design a coaxial gearbox that takes an input shaft that rotates reciprocally (clockwise then counterclockwise) and increases the speed of rotation ...
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2
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Between the front wheel and the rear wheel, what is good for maintaining speed? [closed]
A car weighing 13,000 N is driving at a speed of 50 km/h, overcoming a resistance (Fd) of 450 as shown in the figure. If the coefficient of friction between a wheel and a road on a frozen road is 0....
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Designing a grabber
I designed a grabber for grabbing strings and yarns. the movement that I need is straight up and down to grab a piece of yarn. I wanted to know if this model (in the video) works in real life or not.
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How to find clamping force from bolt preload?
If I have a piece of rubber between two steel plates, and four bolts (at equal preload) compressing the plates, will the total compressive force on the rubber be Preload x 4?
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