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Questions tagged [mechanical]

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0
votes
1answer
53 views

Basic Solenoid Question

I have a super simple question about solenoids. If I wired this, a 120v solenoid valve, to a 3 prong male plug would this cheap chinese humidity controller be able to control it? My assumption is ...
-2
votes
2answers
95 views

How thick is a computer RAM module?

I was just using a DDR3 RAM module as a feeler gauge and it fit the gap perfectly. However, then I tried to find out how thick it actually is and I couldn't find any specs. I'm assuming it's ...
0
votes
1answer
37 views

Meaning of a potentional tolerance value for a dimension in a mechanical drawing

The mechanical drawing below contains two dimensions (2-Ø2.30 and 4-Ø0.92) that I can't make heads or tails of. I have spent quite a while researching mechanical dimensional and tolerance conventions ...
2
votes
1answer
175 views

How is a display with colored cylinders instead of a flip-discs / flip-dots called?

The Rossio railway station in Lisbon (Portugal) uses little colored cylinders for parts of their displays (marked in red). I'd be really interested in getting more information about them, but I ...
-1
votes
1answer
158 views

What motor do i use to rotate a tumbler at low RPM and high torque which run by a battery charged by solar?

I am gonna run the motor to turn a tumbler of 50-85 kg @ 5 rpm MAX. The motor will be powered by a battery which will be charged by solar. So should i go for a DC or AC motor? Single phase or 3 ...
5
votes
1answer
98 views

How to mount pcb with IEC320-C14 power entry connector inside enclosure

I am making a PCB which has one IEC320-C14 and one IEC320-C13 connector on it (Like this one). The PCB will be quite small, just large enough for some sensing circuitry; between 5 and 8 square inches. ...
0
votes
2answers
98 views

How is the shaft of a motor fixed in its position?

Consider for example a brushed DC motor. 1- Is the shaft of the motor (which is rotor in this case), actually floating mid-air because of magnetic field of stator? Why doesn't it fall down due to ...
-1
votes
1answer
45 views

Relation between dash pot and spring in forces when extracting a transfer function [closed]

If a spring load some energy and use it for opposing other forces, and a dash pot has a friction, physically the both shouldn't have the same force-displacement equation ? In most of dash pots, we ...
-8
votes
1answer
91 views

why iron and steel not arcing? [duplicate]

I'm messing around with a 3-6 V to 20-40kv converter My question is when I try steel, aluminum, or iron it doesn't send electric through air and arc, like this picture But when i use copper to make ...
1
vote
2answers
55 views

How are manually and electromechanically actuatable switches called?

I'm looking for (the name of) a part that is basically a bistable relay that has a mechanical interface as well, but I don't know how to look for it. I have seen a simpler but similar part in a ...
0
votes
4answers
124 views

Which type of DC electric motor is the best suited for driving a mechanical clock?

I want to drive a clock mechanism with a motor. In order to get acceptable accuracy I need a motor that can deliver a certain rpm very precisely, is low on vibrations, noise and power consumption, and ...
9
votes
4answers
2k views

Why no macroscopic electrostatic electromechanical parts?

So, I understand that relays, motors, and other electromechanical devices are almost always electromagnetic devices. Why is this? I know that electrostatic motors exist, but what makes them ...
0
votes
0answers
78 views

Possible causes of loss of electrical contact between PCB traces and male USB Type A connector pins soldered to PCB?

I have a problem that I've been embarrassingly working on for months and unable to completely solve. I'm a hobbyist and I have a simple PCB with a male USB Type A connector soldered to it: some of my ...
3
votes
1answer
312 views

What is the usable area (for connectors) of a PCI Express card bracket?

I have a number of awkwardly shaped connectors that I need to cram into a single PCI Express slot metal bracket without any of them colliding with the host PC case's metalwork. The connectors are a ...
2
votes
3answers
552 views

Costs of Conductive Silicone/Rubber Keypad vs. Mechanical Switches?

I am toying around with some new mechanical design ideas. One thing I've never looked at it is the rubber keypads with the conductive "pucks" underneath. I've always used mechanical switches, or ...
1
vote
2answers
388 views

What determines the continous ratings of electric motors?

I've seen variations of this torque-speed curve for brushless DC motor performance, and I'm curious what criteria determine the rated torque and speed of permanent magnet DC motors in general. Does ...
-4
votes
1answer
64 views

Electronic urn pumps [closed]

How exactly do electronic auto dispensers/pumps, such as this one, work? What are the mechanics behind it? (I'd appreciate any information provided, even if it's a comment.)
1
vote
3answers
119 views

Relationship between volts and Mechanical Energy

I am studying Electrical Engineering and I came across one definition of the volt being defined as follows: V = J / C Where "V" is voltage measured in "volts", "J" is energy measured in "joules" and ...
2
votes
1answer
65 views

A mechano-electro-magnetical control circuit

I came up with the following mechano-electro-magnetical control circuit. The system as depicted here is in equilibrium, i.e. the upper spring s1 is relaxed , the upper circuit is closed (C1 producing ...
10
votes
2answers
1k views

Magnetic power connectors (ie. “dots”) for slim power supply connection

This may be more of a mechanical question, but does anyone know what these magnetic power connectors are called? You see these on Fitbits and other IoT devices. I'm building an IoT board, that has ...
1
vote
1answer
144 views

Can the COM and NO terminals of a mechanical relay be used interchangeably?

I have a 240v 30a relay and for layout purposes it may be helpful to orient the relay such that the NO contact is where I’d like the COM contact to be. As it is a NO relay can I simply connect my ...
0
votes
1answer
55 views

Small, low power electrically driven mechanical latch?

I am trying to design a mechanical system which will allow ~2mm of movement (against only its own friction of movement) when an electrical signal from logic circuit is given. Think: a coin suspended ...
4
votes
2answers
956 views

Motor that allows threaded rod to pass through

Is there a motor that can travel linearly up and down a threaded rod. I already know that you can attach a motor to the end of a threaded rod and make a nut travel along the threaded rod but this is ...
0
votes
2answers
914 views

How much electric power can we generate at home by use of treadmill like devices and dynamo? [closed]

I goto gym to burn about 600-1000 KCal. Instead, can we conserve this and be less dependent on grid for basic lighting and TV and other electrical energy needs at home? What are challenges today?
-5
votes
1answer
798 views

Friction Coefficient of AC motor [closed]

Does the Friction Coefficient "B" of AC Motor changes with the change of a load connected to an AC motor? OR it is always constant?
1
vote
1answer
874 views

NTC Thermistor Failure Over Time

I am using 0402 nominally 10k\$\Omega\$ NTC thermistors that are soldered onto a flex PCB which is then adhered to the point of interest in an Alumina based thermal adhesive. The thermistors have ...
2
votes
2answers
96 views

dc motors to control unmanned ground vehicle [closed]

This is my first large project as an electrical engineering student and I'm working with DC motors for the very first time. I'm working on designing an unmanned ground vehicle that will weigh ...
1
vote
1answer
831 views

Types of push button mechanisms

I am having troubles with some push buttons, such that some of them work, some of them sometimes works, and some of them just do not work. In an attempt to find the cause of the issue, I took one ...
0
votes
1answer
89 views

Solution for solenoid valve with can give flow without power? or any other alternative way of it?

I want to use a Solenoid valve for my project, the valve will be used for water in which is facing one problem if there is no power, how can we get water from the valve, I don't want to add any kind ...
1
vote
1answer
168 views

How does mechanical absolute encoder work?

I want to know more about this kind of encoder, but I can't find any source (other than wikipedia), where I can get more details about it. Can anyone explain or point me to a source where I can read ...
10
votes
11answers
4k views

Alternatives to a classic DIP switch

I'm looking for a part that enables a user to frequently change a configuration. Right now I'm utilizing a SMD DIP switch connected to an I2C I/O expander. What bothers me is the large footprint of ...
0
votes
3answers
104 views

May I use relay rated for 5A to switch 12A?

I would like to use an electromechanical relay as an H-bridge, which is capable to drive 12A at 12V. Relays able to control this current are big and expensive. Is it ok to use a compact relay with ...
3
votes
5answers
3k views

Mechanically, is a latching switch always a momentary switch?

I am looking for a switch that (mechanically, not by circuit design) is first a momentary switch and then latches down when depressed far enough to be a maintained switch. Do all latching switches ...
0
votes
2answers
172 views

24AWG vs 26AWG for mechanic reliability

I have to choose a cable that will be bent and may be "stretch" a bit by our users. Which gauge would you advice between 24AWG and 26AWG to resist better ? I guess it is better also to have more ...
1
vote
0answers
2k views

How to produce electricity with mechanical power/spring coil

As a home project I want to make a electricity generator which uses a spring coil, which when turned/wound(just like the mechanism in wrist watches) enough times will start unwinding and generate ...
-1
votes
1answer
138 views

Does merging the chip and the contact pad in a chip-and-pin card make the whole module less reliable?

This picture is from here (A and B letters are irrelevant for this question). A chip-and-pin card like Visa Electron has a ...
3
votes
1answer
325 views

Indicator LED to Case - mechanical design

I got a board for which I need several indicator LEDs and I cant decide on the best solution for the mechanical design of these. The board and the casing currently have a gap of 15mm to each other. ...
5
votes
3answers
401 views

Confusing PAD layout in datasheet

I am planning to use a Right Angle RGB LED EASV3015RGBA0 and here is the package dimension and recommended soldering pad: Top matches with LED image(see the anode mark). Bottom is consistent with top....
1
vote
1answer
132 views

Use Paper as Shim for Circuit Board in 3V device [closed]

I've got a device (a PocketWizard Plus X for you photographers out there) powered by 2x AA batteries that needs a shim of some kind behind the circuit board in order for it to work properly. I used ...
0
votes
1answer
499 views

Mechanical Switch with electronic trigger/gate

There are any part in market that consists in a mechanical Switch which can be turn ON or OFF by a person, and by a electronic? Something like a real switch with a tiny servo inside to push on or off? ...
-1
votes
2answers
313 views

PCB mount potentiometer rotation range of motion (start and end angle)

I am confused about the range of motion of a potentiomter with respect to its base (by base I mean the edge that lays flat on on the PCB when its mounted). Assuming that the mechanical travel is 300 ...
14
votes
7answers
2k views

Measuring small movements of a needle and syringe

My question is how to measure very small movements of a needle and syringe when injecting. When doctors inject local anaesthetic, they always aspirate (suck back) first to make sure they are not in a ...
6
votes
1answer
243 views

Most robust way to stiffen a thin PCB

I am designing a tool to be used for in-house product testing & development, part of the tool is a "probe" that is inserted between the end of an AA battery and the end of its holder (effectively ...
1
vote
3answers
827 views

Circuit breaker automatic switcher [closed]

I have a circuit breaker for my house as this one: Each time we turn on 3 ACs , the breaker turns the current off and I have to lift the circuit breaker switch which is far down stairs in my ...
0
votes
1answer
623 views

Increase Force of a Solenoid

I tried to build a circuit that would allow me to push a washing machine's start button remotely using a solenoid as an actuator. The solenoid is wired to a 9v battery which also powers an ESP8266 ...
-1
votes
2answers
532 views

Synchronous generator mechanical characteristic

Why does the synchronous generator produce a torque just in correspondence of the synchronous speed, that is why is he mechanical characteristic just a straight vertical line in \$\omega = \omega_S\$ ...
0
votes
1answer
90 views

electrostatic seperator build questions

I am building an electrostatic seperator for plant material. the two materials I am trying to seperate have a negative charge but one responds a lot more to positve charges so I feel there will still ...
2
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2answers
122 views

Mechanical to electronic cattle scale

I think this is the right area where to ask this question. I´v got a cattle mechanical scale like this ones here. I have to weigh around 300 cow every month and with this mechanical scale the work ...
3
votes
1answer
129 views

Electromagnetic energy harvesting designing problems

We designed a very simple energy harvester made of a little magnet that moves inside a coil. We have a vibrating environment moving at 12 Hz with 10 millimeters peak-to-peak. Our pcb will be ...
-1
votes
2answers
1k views

Which Switches Faster? Transistor, Solid-State Relay or Relay

Which Switching Device can Switch from Off to On and Off the fastest? Transistor Solid State Relay or Mechanical Relay