Questions tagged [pistons]

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Is there a mechanism that can turn circular motion into alternating circular motion?

I'm trying to power and agitator (alternating circularly back and fourth) with a crank. I've seen a bunch of complicated mechanisms that do this, but I'm looking for the mechanically simplest method.
• 503
137 views

Schematic Reading - Fluid Control Limit Switch Question

Does limit switch LS1 remain pressed on until the piston moves to LS2?
2k views

How Can You Calculate Force to Overcome Friction From an O-Ring Seal?

I essentially have a piston in a tube that is sealed with an O-Ring and actuated with a solenoid. The friction of the O-Ring however, is higher than estimated (guessed as far as I can tell) by the ...
• 498
358 views

Spring - Piston with different extension and compression rate

I am in need of a device that extends freely without much resistance but compresses slowly. I can provide a door closer analogy.The door should open fast but close slowly.... Do you think this can be ...
• 169
92 views

Design Input: Rotary motion to Linear motion, What system should I choose?

I am posting this here because of the multidisciplinary knowledge needed to tackle this issue. Problem: I have to make an electromechanical device that is required to have controllable (downward) ...
• 121
2k views

Calculating leakage in an all steel piston cylinder arrangement

I wish to calculate air leakage in a piston cylinder arrangement. One side is pressurized and the other is at atmospheric pressure. All steel construction. No piston rings or lubrication. The piston ...
96 views

how are these radial piston rotors machined

A typical radial piston rotor can have simple holes machined from the outside through the inner diameter to create flow channels for hydraulic fluid to actuate the pistons. I came across this model ...
36 views

Fluid for mechanical lubrication and hydraulic connection to plastic/rubber parts

I have a piston made of anodized aluminium and stainless steel with nitrile seals which I need to connect hydraulically to our system which mainly consists of silicone rubber with polycarb and acrylic ...
1 vote
1k views

Calculating piston force for pneumatic vs hydraulic

I'm trying to calculate piston force pressures for double acting pistons for pneumatic and hydraulic pressures. I found the following formula for calculating both \text{Force} = \frac{\text{...
• 111
1 vote
645 views

Why there is no piston style pedal bicycle?

I have interested in walking bicycle. For the concept is just bicycle that you don't cycling pedal but stepping or striding to drive wheel Which leads me to think that is it better if we use linear ...
• 129
1 vote
33 views

Cylinder's surface condition of gas springs (gas struts)

I've discussed part of these question somewhere else, but realized I have to be more specific about it. I'm new to this site and hope I'm doing the right thing. I'm planning to manufacture gas struts ...
• 31
1 vote
38 views

Can hydraulics be used with a squarish piston?

I'm designing a custom part that needs an active shock absorber and space is restricted. I most likely won't be able to use a stock absorber and was thinking, can two squarish tubes be made tight ...
• 162
1 vote
943 views

How to calculate the speed and force of the piston in a vacuum syringe?

Suppose i have 4 empty syringes. And by empty i mean they were having the air sucked out of them, and they "contain vacuum". Assume the head of the syringe is blocked so vacuum can be formed. I want ...
• 157
1 vote
1k views

Can an electric motor use reciprocating pistons like an internal combustion engine does?

Would it be possible to have an electric motor that uses an electromagnet to force a piston up and down to turn a shaft, similarly to an internal combustion engine, but without burning fuel? Is there ...
• 240
1 vote
304 views

Circuit to provide position control for double action hydraulic actuator

I was wondering how to construct a hydraulic circuit to control a hydraulic double acting piston/actuator enabling the electronic control of the piston extension. I have found the following pneumatic ...
• 113
1 vote
44 views

How can I make inside a LSAW pipe uniform and smooth?

I am using a LSAW 16mm(OD) pipe, and I need to have a smooth and uniform surface inside it so a piston can reciprocate easily inside it. What is the best and fastest way to remove the inside weld line?...
• 31
1 vote
35 views

Real life example of motor/piston involving an isoterm process?

So I am involved in an introductory course in mathematics for pilots. I have the following problem I would like to give them, as it can be a practical application of integration However, does there ...
1 vote
90 views

What is this part called, and where could I get one?

I'm fairly illiterate when it comes to Engineering, so please understand I have pretty much 0 idea what I'm talking about. I'm having to build a seawater distillation device for school, and we ...
• 11
1 vote
338 views

How can a car can be lifted using hydraulic press?(Pascal's Law)

The above pic is describing the system how the car will be lifted if car is placed on the larger piston. But if the small piston is moved through 1m (say) ,then the piston is merely moved by ...
1 vote
211 views

How to couple two pistons to a rotating shaft so that the piston heads move like this?

Assume two vertical pistons with their flat head facing upward. Is it possible to couple them to one rotating shaft in a way that the position vs. time diagram gets like this? (This is one complete ...
• 111
1 vote
102 views

Is there a mechanism that allows this kind of piston/plunger movement?

I am trying to create a prototype for a gravity energy storage system, and I need to release potential energy stored in a heavy load of mass M, raised to a height *H. I intend to use the mass ...
1 vote
61 views

Solenoid with 3mm stroke and ~1ms response time possible?

I need to extend and retract a needle as fast as possible with dwell time while retracted, while one option I really like would be to use Scotch Yoke with dwell. However that would mean the stroke and ...
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1 vote
62 views

Are there design reasons why there aren't pneumatic pistons for chairs with a stroke >= 400 mm?

In the interest of saving space, I'd like to have a stool that can double as a table. I'd like the height to be adjustable from 16 inches to 32 inches. But I can't find any pneumatic/spring piston ...
• 171
45 views

Purpose of the piston ring in an engine

I am researching the design of engines and I noticed that most pistons have piston rings. My understanding is that the piston ring helps create a gas-tight seal. Is the piston diameter machined to ...
• 167
49 views

Is there any mechanical engineering solution that employs 'ankling', as per a cyclist's ankle/foot/pedal setup?

A cyclist will have the pedal spindle somewhere under the front part of their foot, usually around or just behind the ball of the foot. This means that the ankle is part of the driving movement - at a ...
• 103
180 views

Why do high pressure multistage air compressor have different piston diameter sizes? [closed]

I meant like this kind of compressor https://www.bauer-kompressoren.de/fileadmin/_processed_/csm_compressor-block-junior2_b92a76a02e.jpg also would the compressor reach high pressure if the diameter ...
59 views

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 ...
• 153
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What practically is constant volume heat addition in SI piston engine? [closed]

Isochoric means constant volume (In SI engine: piston should not move when the spark is ignited). In reality piston always keeps displacing up and down means volume changes. So, how does this make it ...
116 views

Thermodynamic, ideal gas problem

I already know solution, I just want to understand something in part b. A vertical cylinder fitted with a piston contains air initially at 120kPa and 100 celcius. The piston is restrained by a set of ...
• 117
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Find optimal configuration for Stirling Engine

I'm trying to figure out the theoretical calculations for a Stirling Engine system so I can determine optimal piston size, optimal piston displacement and number of pistons. I want to calculate which ...
• 152
20 views

What are good materials to make an elastic and durable diaphragm, preferably with high stiffness?

What are good materials to make an elastic and durable diaphragm, preferably with high stiffness to make a diaphragm or membrane pump for gas? Operating temperature will be between 0 and 100 degrees ...
• 101
31 views

Free body diagram of a reciprocating engine

this is a free-body diagram for an engine's slider-crank mechanism . It basically shows the inertia forces acting on the piston,cylinder-wall,crank,and connecting rod. I can't understand why the links ...
26 views

How to draw a pipe being moved between tanks? (ISO standard P&ID)

Where I work, we have a set-up that functionally, works as represented below: I represented it as such, due to a lack of know-how in regards to the actual, ISO-standardized way of representing this ...
• 155
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What will be the force F for the given brake system?

I am getting two ways to find F. One is Fx0.2=30 Nm which gives F=150N Other is Fx0.2-640x0.13=0 which gives F=416N I am confused which one is incorrect. I know problem is too basic but still not ...
207 views

What is the force needed to exert on the piston for a certain extrusion rate of a syringe tube?

I am trying to design a syringe pump for microfluidic extrusion uses. I have a 5cc syringe tube that I will use as the cartridge. We would be using it to extrude a variety of materials so the ...