Questions tagged [mechanical]

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73 views

Ignition damage [duplicate]

I made this circuit using a 5nf capacitor. (Ignition coil in series with a light dimmer and at least a 0.1 mf capacitor, powered by 240v) https://www.instructables.com/id/Variable-voltage-ignition-...
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1answer
50 views

Mechanical Circuit Analog Question

I'm doing a practice problem from https://6002.catsoop.org/F19/ex11/mechanical_analog The problem is as follows: A mass m = 10 kg is at rest on a horizontal plane with viscous friction coefficient B =...
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2answers
68 views

How to create a mechanical vibration?

I need to create a system which will make vibrate horizontally a plastic tube of diameter 4cm, of height 3cm, which axis is vertical, and whose weight is 11g. The frequency should be modifiable ...
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3answers
121 views

Driving relay directly from optocoupler, what is best?

I'm designing a smart socket using an ESP-32 and a mechanical relay that can drive 5A at 240VAC. Following typical relay driving circuits, I would like to use an optocoupler between the MCU and relay. ...
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1answer
59 views

When to use a terminal pin?

Would you ever be advised to solder hookup wire to a terminal pin (and maybe sleeve it with heat shrink) instead of soldering it directly to the PCB?
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1answer
94 views

20A or 30A fuse in 200A fuse clips — is nesting reducers OK?

So, I am trying to figure out the cleanest way to make a 20A or 30A tap from a 200A circuit (single hot + neutral) that is being run through a fusible safety switch (NEMA style, as this is in the USA),...
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1answer
46 views

simple design for mechanized home automation devices to stop at limits [closed]

can you point me to any existing designs or ideas for simple DIY type mechanism to ... for example... roll up/ roll down a motorized movie screen and stop when it gets to some specific limits. i ...
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2answers
108 views

PCI card electromechanical specification

I am making an old PCI (5V) form factor card for a product, and am having a hard time finding any sort of reliable drawing showing the official dimensions of the gold fingers, key cutouts, and their ...
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1answer
56 views

Why has the XBOX360 controllers battery pack an integrated breaker contact

Everyone owning a XBOX360 with wireless controllers came across a phenomenon where older controllers were switching off randomly while playing or if they were moved too quickly. Me and everyone i know ...
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2answers
141 views

How to keep users from breaking push button switches

I'm designing an enclosure for a device with a push button switch. The external button on the enclosure is physically large so I am concerned people will apply too much force and break the switch or ...
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4answers
104 views

Can a PCB footprint be extracted from a solid model?

I usually just make a PCB footprint if I need it (Solidworks PCB, Altium, Protel99, OrCAD, etc). I'm an electrical engineer. I've seen very nice 3D solid models for some parts and I wonder if the PCB ...
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0answers
48 views

Control a solenoid position “in / out” with power only (no spring)

I'm going to use a < 5$ solenoid (vertically oriented) that has to press something. If I understand well, a linear solenoid like this one: moves to one precise position when powered, but when you ...
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1answer
57 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 ...
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2answers
140 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 ...
1
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1answer
77 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 ...
3
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2answers
258 views

How is a display with colored cylinders instead of 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 ...
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1answer
292 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
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1answer
156 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. ...
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2answers
195 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
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1answer
57 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 ...
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1answer
99 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 ...
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2answers
59 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 ...
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4answers
145 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 ...
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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 ...
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0answers
84 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 ...
4
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1answer
818 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
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3answers
958 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 ...
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2answers
623 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 ...
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1answer
65 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.)
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3answers
148 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
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1answer
68 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 ...
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2answers
2k 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
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1answer
149 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 ...
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1answer
61 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 ...
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2answers
1k 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 ...
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2answers
1k 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?
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1answer
1k 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?
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1answer
1k 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
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2answers
106 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 ...
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1answer
1k 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 ...
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1answer
97 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 ...
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1answer
203 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 ...
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11answers
5k 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 ...
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3answers
107 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 ...
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5answers
4k 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 ...
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2answers
224 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 ...
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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
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1answer
162 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 ...
2
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1answer
402 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. ...
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3answers
421 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....