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Questions tagged [mechanical-assembly]

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3 answers
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Ways of improving USB-C mechanical durability

Many PCB-mounted connectors, in my case a USB-C have no specification regarding mechanical integration. Often, the mechanical durability seemingly relies on through-hole (sometimes even surface mount) ...
NoobPointerException's user avatar
1 vote
1 answer
117 views

Auxiliary mechanical anti-ESD measures

If a PCBA within a plastic enclosure is prone to malfunctioning due to ESD air discharge in proximity of enclosure seams and openings, but changing the hardware or plastic design is not an option, ...
NoobPointerException's user avatar
0 votes
2 answers
69 views

Can a vertical multiwatt package be bent to lie horizontal after it is installed?

I am working on a project with a multiwatt package audio amplifier IC. Can this component be bent over to lie horizontal, flush with the PCB, after it is soldered into place?
Emmett Palaima's user avatar
0 votes
1 answer
593 views

How to secure USB connections mechanically

What is the recommended way to secure USB Type A connections to their ports to protect against vibration (such as from a human walking, or if it was in a vehicle), in manner that will last at least ...
kekpirat's user avatar
  • 115
0 votes
2 answers
87 views

DC motor datasheet: dimensions

I have a PC280LG-302 DC motor, and I need to know the shaft length for this. In the documentation they just wrote it as DIM."A" and total length as DIM."B". Can anybody understand ...
visahl's user avatar
  • 31
0 votes
1 answer
301 views

Problem with connecting split keyboard with sea-micro microcontrollers

First of all, I'm not sure that this issue has a place in this forum, if I'm wrong, please let me know and I'll post it where appropriate. I have assembled a mechanical keyboard based on helix. The ...
Fco Javier Balón's user avatar
3 votes
1 answer
583 views

How can I re-assemble this cheap scale's LCD display?

I had to disassemble a cheap kitchen scale for cleaning after it stopped working because of fluids. To my surprise I found the LCD does not seem to have a physical connection, but some sort of ...
Gabriel's user avatar
  • 141
0 votes
1 answer
199 views

Motor shaft adapter cannot be removed [closed]

Motors that I have worked with in the past are as simple as can be, having just one long cylindrical metal shaft sticking out from the magnetic interior (and thereby allowing the "end product ...
bobuhito's user avatar
  • 544
4 votes
4 answers
5k views

Is there any difference between Silicone and RTV

I've used silicone RTV that's intended for use on PCBs and have also used 100% silicone purchased from the hardware store to use on PCBs. I was not able to tell a difference between the two. ...
bunker89320's user avatar
  • 1,058
2 votes
2 answers
179 views

How to draw detailed assembly outline

How do you draw this detailed mechanical/assembly outline? I saw this at this pdf from Altium https://resources.altium.com/sites/default/files/uberflip_docs/file_1195.pdf
maaaaple7's user avatar
  • 103
0 votes
1 answer
288 views

How to assemble USB-C power connector?

I bought a few USB-C power connectors to reuse old power supplies with new Raspberry Pi power socket standard. Here is the original picture: When I try to assemble it by merging these together: the ...
Paul Jurczak's user avatar
-1 votes
1 answer
48 views

Solar tracking using a helicopter blade control [closed]

I've been trying to build a dual-axis solar tracker but the ones I saw needed linear actuators. I'm thinking how about using SG100 servos with the concept of blade control in helicopters to build the ...
user290329's user avatar
1 vote
1 answer
88 views

Reliability of Adhesive Standoffs

I am considering using an adhesive standoff in an assembly, replacing my current setup of brass standoffs with screws. The current assembly is reliable, but the assembly time of adding the standoffs ...
jsinglet's user avatar
  • 209
24 votes
4 answers
11k views

Why use kapton tape?

I have noticed a lot of electronics use kapton tape in places where a heat resistant tape isn't necessary. Why is that so? Is it just because it's a good adhesive?
Artichoke's user avatar
  • 447
37 votes
2 answers
3k views

What kind of tape is used to hold together electronics during shipping?

Not so fast! This isn't that kind of tape (Kapton). By holding electronics together, I mean to hold mechanical parts together for shipping such as flaps and other parts that can flop such as printers ...
Zhro's user avatar
  • 2,885
1 vote
1 answer
216 views

Protecting circuit boards against shock?

Our company have been designing and manufacturing custom circuit boards for some 10 years now, and up till now by far the most common reason for board failure has been a mechanical shock - heavier SMD ...
Artanis's user avatar
  • 121
0 votes
1 answer
126 views

Assemble back a momentary switch

I have this momentary switch that is used as a Reset switch on my computer : I opened it and I'd like to assemble it back. It's made with these parts: the push button the grey "frame" a ...
Oliver's user avatar
  • 259
44 votes
5 answers
14k views

Why did Axial Capacitors Fall Out of Use in the Industry?

When inspecting the boards from electronics made in 1980s and earlier, one distinct feature is the extensive use of axial, electrolytic capacitors as power supply filter. Axial ceramic decoupling ...
比尔盖子's user avatar
  • 7,218
21 votes
3 answers
8k views

How to secure cables to a PCB

What is a good way to secure cables to a PCB? There are some good advice in the following post, but the application is slightly different: Securing electrical cables to holes in enclosures? In this ...
K0ICHI's user avatar
  • 429
0 votes
1 answer
841 views

Avoiding mechanical shock damage on a PCB

I'm currently working on a PCB design that will have to go in a plastic enclosure. This plastic enclosure will have to endure severe shocks (dropped from 2m to ground) so I'm looking for ways to ...
Prof_Sims's user avatar
  • 110
1 vote
1 answer
162 views

Power Cable Strain Relief Solution Needed for Restoring Vintage Electronics

I recently acquired a vintage Tektronix active probe from 1969, and I'm in the process of restoring and modding it for modern scopes. The unit is in good shape, but the connector is no longer in ...
比尔盖子's user avatar
  • 7,218
3 votes
3 answers
567 views

PCB surface shim

We have a PCB with a detector that must be positioned at a particular height above a mounting surface. Our plastic parts are slightly undersized, so we must add some space (0.4 mm) between our PCB ...
rothloup's user avatar
  • 428
0 votes
2 answers
373 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 ...
Josh Wales's user avatar
0 votes
1 answer
72 views

Board soldered airtight capsule

Mechanical Engineer here, not an EE. I have some environmental sensors that need to be a part of a flow path. It occurred to me that it might be possible to have a metal "can" that sealed to the ...
Mordecai's user avatar
0 votes
0 answers
43 views

Robotic tool changer functionality

Have you any idea how is a changeable end-of-arm tool powered when is interfaced with an ATI tool changer or something similar ? My first thought is that on both sides of parts is a F/M connectors ...
Alexandru Lebada's user avatar
1 vote
2 answers
120 views

Is there a motor design where a rotor gradually moves into a stater? [closed]

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor, but the primary motion is rotary,...
Dan Glinski's user avatar
4 votes
1 answer
2k views

How do I assemble the mechanical parts of panel mount switch? (lock ring, lock washer, nut, etc)

I'm sure this is a very simple question, but I'm not familiar with the different mechanical parts of a simple switch. For example, I've purchased this switch and it includes: Switch "Lockwasher" ("...
SofaKng's user avatar
  • 481
0 votes
2 answers
127 views

How to automatically assemble lithium polymer battery?

I'm redesigning a product for automatic assembly (DFA / DFX). The current product includes a lithium polymer battery with solderable leads, very similar to this: Right now the leads are hand-...
Alex I's user avatar
  • 3,481
1 vote
2 answers
2k views

mounting orientation for Meanwell enclosed power supply

I am building a small system that includes two Meanwell LRS-100 series power supplies: https://www.meanwell.com/Upload/PDF/LRS-100/LRS-100-SPEC.PDF Note the photograph on the first page of the data ...
RustyShackleford's user avatar
2 votes
2 answers
2k 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 ...
Zeta.Investigator's user avatar
1 vote
1 answer
1k views

best adhesive for FR4 to aluminum

I am making my own LED bulbs (for wedge-base sockets in a low-voltage application). A key construction detail requires me to cement a small (roughly 3/8" x 1") piece of FR4 circuit board (which plugs ...
RustyShackleford's user avatar
0 votes
1 answer
84 views

Glue used to adhere cellphone / laptop components (not screen)

What type of glue is used to adhere cellphone (or laptop) components (excluding the screen which has its own speciality glue)? I'm talking about the sticky, but not too sticky glue used to hold things ...
Jet Blue's user avatar
  • 1,143
0 votes
4 answers
626 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 ...
Andreas Hartmann's user avatar
1 vote
3 answers
191 views

Unobtrusive panel mounting for controls

I'm in the middle of a "living room acceptable" project, and I'm looking to capture the spirit of a 1970s preamplifier (Quad 34, see below). My design has 6 LEDs, 4 push buttons, a latching mains ...
awjlogan's user avatar
  • 7,959
0 votes
1 answer
968 views

gear motor can be used as generator

I am in doubt with a motors operation, I am not sure whether this question could be asked here, I have a car wiper motor with two speed operation,It uses a PM dc motor with worm gear inside, so it is ...
Eng. Jamshid's user avatar
6 votes
1 answer
5k 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 ...
user avatar
2 votes
3 answers
2k 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 ...
Leroy105's user avatar
  • 1,907
8 votes
4 answers
682 views

Colliding fasteners in electronics retrofit project

I have a mechanical problem with securing a Mini PCIe card into an adapter which then goes into a legacy product's connector. Look carefully at the orange PCB in the picture below and you'll notice ...
user avatar
4 votes
2 answers
2k 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 ...
Jim's user avatar
  • 159
22 votes
3 answers
7k views

Is 0603 vs 0402 assembly mass production cost optimization still relevant?

Historically, choosing a design avoiding 0402 and finer pitch components was advantageous for mass production cost savings. The yields were improved and accuracy requirements for pick and place ...
lm317's user avatar
  • 1,010
1 vote
1 answer
121 views

Control of motor engagement with shaft

I am using servo and stepper motors for the first time, and have been searching for a solution to this basic problem: I want to drive a shaft with a motor, whereby this shaft also has a ‘neutral’ ...
George Ellis's user avatar
0 votes
1 answer
131 views

Bolting a steel ring terminal to a steel tab on IGBT?

This is a similar question to one answered here: what are the best practices for bolting a ring terminal to a steel panel? However, the main difference is that I am not attaching a ring terminal to a ...
Jakir00's user avatar
  • 113
1 vote
1 answer
1k views

what are the best practices for bolting a ring terminal to a steel panel?

i have made several new bolted grounding points in project boxes and in my car. i don't have data on how long they last, but i been following a strategy like this to connect a ring terminal: drill a ...
Aaron Brick's user avatar
2 votes
1 answer
1k 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. ...
KarlKarlsom's user avatar
  • 1,822
0 votes
1 answer
492 views

Electronic insulation paper, home made alternatives?

I need some electric insulation paper similar to Aramid. It's to protect lithium batteries which only operate under 200°C in a worst case scenario, and normally less than 70°C, and Aramid can handle ...
bandybabboon's user avatar
3 votes
1 answer
154 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 ...
ThreeState's user avatar
3 votes
3 answers
130 views

What is the easiest way to stagger a signal chain on a stack of identical boards?

I am designing a stack of identical boards that each generate an analog signal. What I am trying to do is take the signal from the board above, mix it with the signal from this board, and then send it ...
Lombard's user avatar
  • 153
1 vote
2 answers
247 views

Suitable FFC socket for this LCD module

I've ordered this LCD module, and I'm trying to find a suitable connector for it. It's 26 pins with pitch of 0.8mm, but as you can see, the right hand side is "sticking out" of the connector. Is this ...
liorda's user avatar
  • 123
0 votes
2 answers
134 views

Can't recognize circuit element in old clock mechanism

I am spending my free time thinking of how to make an old clock in my hometown working again. Here is a picture of the mechanism. I can't recognize the marked parts. Hope somebody of you can. In this ...
Nexy_sm's user avatar
  • 409
1 vote
4 answers
2k views

Standard way to tension a string using a motor?

I am dealing with a design that requires me to tension a small string, about 5 inches long with a diameter of about 1-2 mm, and then keep it under tension (lock it in place) without the use of ...
Alexandru's user avatar
  • 295