Questions tagged [pneumatic]
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15 views
Reality check: Sub-sonic convergent nozzle for raising gas velocity to achieve required velocity head
The situation is as follows: atmospheric air is accelerated to 5 m/s with an idealized disk actuator, then passed into a convergent nozzle such that it's velocity is raised to 339 m/s and then flows ...
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1answer
19 views
Emulate impact forces using pneumatic piston
I am trying to test a piece of furniture based on a particular code, the code states that i can either drop a bag (with a specific shape) of 57 kg 1.2 in above the seat or I can use other methods as ...
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1answer
10 views
How to ensure uniaxal and uniform force application on uneven samples using pressurized fluids
I am trying to apply a compression force to samples using air. I do not want to directly apply my loading since my samples are irregular. I do not wish to process them with a flattening step. I hope ...
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17 views
Hub Mount Motor to Flange Mount
I have spec'd out a pneumatic motor with acceptable torque for a tension application. The motor has a 1.25" hub with set-screw indent for it's mounting method.
Since this a prototype system, I don'...
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2answers
52 views
Designing a pneumatic system for consistent pressure/flow
Fellow engineers, I need your help in improving my design for a pneumatic system for maintaining a constant supply of at least 90 PSI and 20 CFM for a particle analyzer with stringent air requirements....
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38 views
Volumetric & Mass Flow Rate Through a Piston-Cylinder Annular Gap with Laminar Flow?
I am attempting to define the proper equations used to calculate both volumetric and mass flow (based on pressure differential) through a Laminar Flow Element. The element consists of a piston ...
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2answers
36 views
Ideas needed: how to tilt a panel side to side [closed]
requirements:
a panel of wood 4 ft long by 2 ft wide laying flat
this panel should be able to tilt side to side (2 way)
the weight on the panel will be about 250 lbs up to 400 lbs.
controlled lift of ...
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0answers
15 views
Is this Proportional Electro-pneumatic valve a direct replacement for other valves listed?
In the midst of trying to redesign the pneumatic subsystem of a combined system, I'm at the point of validating a new valve would serve as a direct replacement. The reason for the redesign is an ...
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116 views
I want to understand this pneumatic circuit
I have trouble understanding the following pneumatic circuit diagram:
I am new to reading circuit diagrams and i am unfamiliar with some of the symbols. I would appreciate if somebody could explain ...
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0answers
34 views
Choosing a blower for a Pneumatic Conveyor
Basically we are designing a pneumatic conveyor system for transferring 11 tons of beans per hour.
We need to decide on the specifications of the blower. What are the calculations necessary to decide ...
1
vote
1answer
96 views
Pneumatic cylinder: Pressure rating
I want to create a Pneumatic cylinder, The purpose is, Inside it will will contain a Nylon piston, and one end will be filled with clay. Cylinder will be closed from either side using end caps, which ...
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1answer
50 views
How do I connect pneumatic components with metal tubing?
I'm building a small pneumatic control cabinet with a couple filters, regulators, valves, and flow restrictors. I had started by using 8 mm push-to-connect fittings and nylon tube, but it seems I can ...
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1answer
48 views
What is the “quick bleeder valve” in this tool changer pneumatic schematic (and other questions)?
I'm building a CNC router around a HSD ES330 spindle motor that has pneumatic tool-changing ability. The manual recommends the following pneumatic circuit:
I'm not sure I understand the purpose of ...
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1answer
41 views
Why were pneumatic thermostats commonly installed in buildings?
According to Wikipedia, pneumatic thermostats were invented after electric thermostats.
Yet this article claims that "at least 25 percent of U.S. commercial buildings are served by pneumatic controls,...
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1answer
21 views
Best balance of electrical and pneumatic control lines in CNC router table?
I'm building a 4' x 8' gantry-style CNC router table. The spindle motor uses pneumatics to power its draw bar (for automatic tool changes). There are three separate pneumatic supply lines that go to ...
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2answers
662 views
What's the difference between a vacuum regulator and pressure regulator?
When browsing through pneumatic parts, I notice that some vendors specify different components for pressure regulator and vacuum regulators. SMC for example does this.
I'm curious why vendors would ...
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2answers
90 views
Is it standard practice to use a pressure relief valve as a pressure regulator?
I'm attempting to understand the difference between a pressure relief valve and a pressure regulating valve. From my research far, I've come to the following conclusion:
Pressure relief valves are ...
1
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1answer
585 views
How do you interpret a pneumatic regulator symbol?
I'm an EE trying to interpret a pneumatic schematic and have a few questions regarding the symbols being used.
I've come across two different regulator symbols (or so I believe them to be regulator ...
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1answer
49 views
How to maintain a static negative pressure in a valve?
My target is to create a valve with multiple inlet capillaries. And my output is a pipe of a larger diameter. I do not want to use any electrical systems, and at the same time, I want to maintain ...
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1answer
77 views
What type of pneumatic valves would represent the valves in the schematic?
What type of pneumatic solenoid valves would represent the valves in the schematic?
Specifically, the lower valves could be represented by a 5 port 4 way 2 position valve. This is because there is ...
2
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1answer
40 views
Pneumatic actuator capable to achieve 5m/s?
Is there a pneumatic actuator capable to achieve 5m/s and will be good idea for constant work? I know SMC have up to 3m/s, but I can't find faster.
2
votes
1answer
91 views
How to connect a pneumatic cylinder to a door?
I have this pneumatic cylinder that I wish to connect to a wooden door in order to make it kinda like a Star wars door. I'm wondering what the best way to connect the cylinder to the door would be.
...
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2answers
38 views
Cylinder Reconditioning [closed]
When reconditioning of a pneumatic cylinder, which fit between piston and cylinder is required? and how much tolerance between mating parts is required?. Will surface finish inside of cylinder play a ...
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2answers
484 views
Lpg cylinder to compressed air tank
I am building a small robot having pneumatic system. I am using 12v car tyre inflator as my compressor.But i didn't find any 3ltr to 6ltr standardrd air tank. Can i convert my old 3ltr lpg tank into ...
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25 views
Air demand for powder fluidization system
I need a good estimate of the air demand for a system to fluidizde a powder. We a have silo with a 60° cone and a rotary cell feeder attached to the opening in the cone. The powder (fine powdered ...
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1answer
236 views
How can I connect a silicon hose with 2mm inner diameter to a smaller 1,9mm port
The biggest diameter of my pressure sensor input port has a size of 1.93 mm. The silicon hose which I want to connect with the sensor's port has an inner diameter size of 2.0 mm.
My honeywell ...
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1answer
2k views
How to uninstall SIMATIC STEP 7-Micro/WIN V4.0.8.06?
I recently installed SIMATIC STEP 7-Micro/WIN V4.0.8.06 but cancelled the installation after some steps.
But the program appears in the control panel and when I try to uninstall it, the error:- "Did ...
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1answer
348 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{...
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0answers
28 views
Proper way to power/use a vacuum cylinder?
I'm considering using a vacuum cylinder in my project (like these ones) to lift sheets of cardboard, but being new to mechanical engineering I'm not at all sure what I need to attach to operate one, ...
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1answer
56 views
Hydraulic Arm - Handbrake
I am researching a system that appears to have a hydraulic arm with some kind of "handbrake" as pictured below:
System Description:
Table that can raise and lock into place
Locking mechanism ...
0
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1answer
58 views
Rotary Screw Air Compressor
I have a 50 HP screw compressor that has just began to load and unload within 10 seconds when previously would take between 40 and 60 seconds. Nothing has been added or removed from the system. Any ...
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1answer
70 views
What material properties matter when selecting a material to withstand a specific pressure (as a sealed tank)?
I want to design a tank to hold liquid propane. The proposed tank would have one inlet valve, one output valve, and no sharp edges. I've read that the pressure required to maintain propane in a liquid ...
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2answers
85 views
Air flowrate required for testing a pneumatic cylinder?
First time designing with pneumatics here. I want to build a continuous use device (with ~30 back and forth actuation per minute) but do not currently have access to a large compressor.
Is there a ...
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2answers
128 views
Rules of thumb for sizing an air pump piston?
I am working on a design for a small air pump that uses a single piston.
When choosing a piston I have two parameters diameter and stroke. So, I can make it fatter and shorter, or skinnier and longer,...
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1answer
60 views
pneumatic solenoid operation?
Any idea on how this type of pneumatic solenoid works? I know that NC is normally closed, NO normally open, but not sure how air flows? Thanks!
2
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1answer
1k views
How strict is the direction of air flow in a single direction pneumatic solenoid valve?
I am currently designing a small pneumatic system that pumps air into an airbag, holds the air in, then releases it to the atmosphere. Each pump in the system actually feeds two sets of airbags and ...
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2answers
188 views
Are precision pneumatics possible?
I've seen some of the robotics competitions use pneumatic actuators for brute force actions ( like a hammer or lift ), but nothing precise. Is it possible to use pneumatics in a more precise scenario?,...
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130 views
Axial damper type?
I am trying to find again a small plastic damper that I was looking at last year, but forgot the exact name for that type and now I am unable to find it again. Quite frustrating.
It is pretty much a ...
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0answers
477 views
Estimating Maximum Speed for a Pneumatic Cylinder
I am designing an machine that is going to use a pneumatic cylinder to accelerate a projectile. I have a tentative cylinder specified, and am working on the control and supply side. I have verified ...
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2answers
151 views
Do non-linear passive pneumatic throttles exist?
On of the more simple throttles is a channel, which is described by the Hagen-Poiseuille equation:
$$\Delta P = \frac{8\mu L Q}{\pi r^4}$$
This equation, when rearranged, tells us that the Flowrate $Q$...
