9
votes
Does a motor suffer damage when resistance to the intended motion is met?
The answer depends on the specific type of motor you intend to use, but in general: when a motor is loaded down, it draws more current, which means its windings get hotter at the same time that the ...
- 15.3k
7
votes
Accepted
Why excavators use Hydraulic motors for rolling or moving forward instead of diesel engine?
Yes, because many or most excavators can 360 rotate so getting a classic gearbox/ prop shaft drive to the wherls or tracks would be challenging.
Then sorting the ability to do forwards with one side ...
- 16k
6
votes
Does a motor suffer damage when resistance to the intended motion is met?
It depends on the specific type of motor, as @nielsnelson mentions, but it also depends on what you use to drive the motor.
In general, a motor that's designed to run continuously isn't going to take ...
- 2,767
6
votes
Why are hydraulic systems widely used to multiply force ? won't a couple of gears do the job?
Power density. Modern hydraulic systems are way better compared to ropes and pulleys, gears, electromagnetic systems or levers.
Freedom of geometry. Put a cylinder somewhere, get a rubber hose to it, ...
- 499
5
votes
Why do hydraulic systems use special fluid - what's wrong with water?
In terms of historical interest, water was used in the first hydraulic brakes and very soon the obvious problems of freezing (due to ambient temperature) and boiling (due to lots of brake use) became ...
- 16k
5
votes
Why do hydraulic systems use special fluid - what's wrong with water?
In addition to the other answers, water is commonly used as a primary working fluid in industrial hydraulic systems with additives to prevent the issues mentioned above. Typical applications include ...
- 376
5
votes
Why actuators are mounted in inverted position?
The cylinder will be mounted where it is easiest to get the hydraulic lines to it.
- 7,148
4
votes
Why do hydraulic systems use special fluid - what's wrong with water?
Even the presence of water in hydraulic oil will damage the system components. Then you can think what will happen when you choose water as a hydraulic fluid. A hydraulic fluid is selected depending ...
- 51
4
votes
Calculating piston force for pneumatic vs hydraulic
The formula is valid independant of the fluid.
The force in an hydraulic system is based on pressure and area - a height difference between pistons is usually small compared to the acting pressure ...
- 16k
4
votes
Managing water supply pressure to a building
The best method is to pressurize your tank on the upper floor, then regulate the flow as it goes down. This is because pressurizing will require active components (i.e. pumps, and other devices that ...
- 5,333
4
votes
What kind of pressure switch can I use for pressures up to 5-10 tons/cm^2?
You do this by monitoring the hydraulic pressure rather than the press tonnage.
Since force = pressure x area we can rearrange so that pressure = force / area.
Using your quaint units of measure, 5 ...
- 11.1k
4
votes
Accepted
Mechanism of a manual Crank Adjustable Height Standing Desk
the crank handle is connected to the little black box, inside of which there are gears that rotate the metal shaft you can see running through the box and across the back of the table support. the ...
- 15.3k
4
votes
How to lift an antenna tower into position?
The forces to lift a 100 ft tower from horizontal are going to be enormous. So you will have to build the tower stronger, which will make the forces even larger.
For a 100 ft tower erect it once, and ...
- 7,148
3
votes
hydraulic diameter
You have the correct answer, you just haven't simplified the terms.
Root 3 divided by 3 is 1 over root 3.
ie. x^(1/2) / x = x^(1/2).x(-1) = x^(-1/2)
- 9,752
3
votes
How do you get a closed vessel to >90,000 psi internal pressure
Contact an engineering firm with experience designing and building such systems and vessels to code. Otherwise, you're just building a bomb.
- 2,145
3
votes
Accepted
Hydraulic Arm - Handbrake
It is a gas spring. They are rated in units of pounds and travel in inches. Typically ranges are 10 to 200 pounds, and 6 to 24 inches. Here is one example :
https://www.amazon.com/JR-Products-GSNI-...
- 446
3
votes
Accepted
Where exactly will a hydraulic jump occur?
First a hydraulic jump is where fluid will transition from supercritical (having a Froude Number greater than one, to subcritical (having a Froude Number less than one). When the Froude number is near ...
- 1,335
3
votes
What are the tradeoffs between using hydraulic motors and electric motors?
you will find that a generator capable of delivering, say, 10HP (electrical equivalent, 750 watts = 1HP) is very big and heavy and a hydraulic pump with a 10HP rating is smaller and lighter. Similarly,...
- 15.3k
3
votes
What are the tradeoffs between using hydraulic motors and electric motors?
You get more free gearing with the hydrostat, and much smaller package and less weight. Take a 60hp diesel and hook it to a hydraulic drive servo. It makes up to 4500 psi peak pressure, or 8 gpm peak ...
- 5,105
3
votes
Accepted
Is it illegal to use the hydrodynamic energy contained within the city water supply to generate electricity?
Interesting problem.
Let’s see, if we have a cylinder 12 inches in diameter and 8 feet high that would be
(pi*(0.5f)^2*8f)*7.48 g/ft3=47 gallons per operation.
...
- 1,207
3
votes
Accepted
How to make sure a pipe does not take all of the water from a stream?
You can put a valve on your pipe to control the flow.
Or partition the stream by means of a short concrete wall which looks like an indented grout trowel upside-down . Say two opening for the stream ...
- 22.8k
3
votes
Accepted
Can an AC compressor used as a Hydraulic pump?
No, the clearances, compression ratio and valves are not designed for that use.
If you want a hydraulic pump then use a power steering pump, now available in two flavours mechanical ie engine or belt ...
- 16k
3
votes
Why are hydraulic systems widely used to multiply force ? won't a couple of gears do the job?
Hydraulics can be used more naturally with engines for servo-like motions (try reversing direction or holding position on a engine driven gear box).
Piston must be of precise dimensions without any ...
- 5,629
3
votes
Accepted
Is there a way of find the ideal balance between pressure and fluid flow in a hydraulic system?
What you are describing is referred to in dynamical systems analysis as an impedance matching problem.
For optimum transfer of power (effort x flow), the impedance of the source must equal the ...
- 15.3k
2
votes
Force required to crop/cut a mild steel bar
Here is the formula: https://www.researchgate.net/post/how_to_calculate_cutting_force_required_by_hacksaw_for_particular_work_piece_for_particular_hardness
Fc = zckzA*f
Where:
Fc = cutting force ...
- 21
2
votes
Why no hydraulic piston gas compressors?
The elephant in the room is that while gasses are compressible, hydraulic oil is only negligibly so.
This difference has two major effects:
Firstly, the output volume flow is limited by the intake ...
- 251
2
votes
Accepted
Some questions about liquid nitrogen cooling
Regarding questions 2 and 3, I think you need to look deeper in the chemistry, reactivity, and heat transfer characteristics of Nitrogen.
1) It is not a noble gas. It is reactive, and you benefit ...
- 196
2
votes
Why is pressure head ignored in open channel flow?
Because head pressure is the weight of the water standing on top of the region being measured. Even though you can visualize an open channel as a slope you will not see a difference in pressure if you ...
- 452
2
votes
Linear force multiplication (or division) without hydraulics
Take into a count what you want to do. Hydraulics is used for a reason: it can transmit huge power. The idea of using gears and then using a linear one is good, but you need to know if it is going to ...
- 21
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