Questions tagged [prototyping]

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Where can I buy industry quality ready prototype construction set? [closed]

I am designing a mechanical machine. I have constructed it successfully using children's construction set like Merkur. The machine I made makes a lot of rotation. Consequently, the children's ...
0 votes
3 answers
70 views

Solidworks - The protrusion disappears when I enter into sketch mode? What am I doing wrong?

I am fairly new to Solidworks but know basics of it (basic only). The have made a shape (which I have 3D printed as well), but I need to change the dimension of the protrusion now. Here is the design ...
1 vote
0 answers
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backrest angle mechanism for a Cargo Bike seat [closed]

I'm looking for a joint with an integrated rotating and locking mechanism, that can hold the load of a back leaning onto it. I have attached a dirty render of the concept. Hope this will make the ...
0 votes
1 answer
203 views

How to mix pure CO2 with air so that a bioreactor can be fed with air at 0.1% to 10% CO2?

The situation is we have to prepare a gas mix of air and CO2 which has to be given as input from 0.1% to 10% CO2 of air mix to the aqueous medium in a bioreactor? I'm trying to build a simple and ...
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4 votes
4 answers
179 views

Engineering Best Practice: Rev control for trial parts after release?

In my company, we distinguish prototype from production prints by numbered vs. lettered revisions in the title block, and numbered revisions don't require an ECN in the title block. This allows us to ...
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0 votes
2 answers
109 views

Pumps' geometric similarity

Given two pumps that are similar : $H_1=70-1.41x10^{-3}Q_1^2$ $H_2=100-1.1x10^{-3}Q_2^2$ Find the geometric scale : $\frac{D1}{D2}= ?$ I am also given maximum efficiency = 1. I tried solving but I got ...
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0 votes
1 answer
89 views

How does the Nest Learning Thermostat bezel rotate without bearings?

Looking at both the Nest iFixit teardown and this Nest bezel replacement tutorial, it looks like the Nest stainless steel bezel mounts directly to the PCBs and displays inside. The Nest bezel is able ...
  • 103
0 votes
1 answer
34 views

Fasten adjustable perpendicular cylinders rotating on axis

What part(s) make it simple to secure two perpendicular cylinders together when one of the cylinders is rotating on its axis? In the drawing below, C(3) rotates with a simple motor. C(1) and C(2) ...
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0 votes
2 answers
199 views

Which software to get started with 3d Modeling [closed]

I'm a software engineer by trade, but I have an idea I'd like to turn into a prototype. for starters its going to be a rectangular project box with some buttons and displays, nothing too complex. I'd ...
1 vote
0 answers
64 views

How can you convert 180 rotation into two separate motions?

I have a small servo that can rotate 180 degrees. I would like to get two different connected parts to move at different times, one part moving while the servo is between 0-90 degrees, the other part ...
1 vote
1 answer
47 views

Switching a Circuit on-and-off In-step with the Rotation of a Drive-shaft (Mechanically)

I'm working on a project. The Salient part here is a drive-shaft connected to a bearing, onto which a simple circuit is mounted. I want to switch the circuit on every $π$ and off for the other $π$ of ...
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-1 votes
1 answer
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How do you create a mounting device for a PCB if the PCB's mounting hole positions aren't documented?

I'm trying to create a place for these PCBS to mount onto: https://www.amazon.com/ELEGOO-Prototype-Soldering-Compatible-Arduino/dp/B072Z7Y19F/ref=pd_cart_vw_crc_1_2/133-3052301-7665733?_encoding=UTF8&...
-1 votes
1 answer
47 views

Designing A Freely Spinning Object

I'm doing a project that involves spinning up a (roughly) 2.28 kg object to 5000 rpm (via a DC motor) and then letting it continue rotating under its own influence (without any more input from the ...
0 votes
2 answers
604 views

oscillation motion from DC motor (computer fan)

I intend to make an oscillating motion from a simple computer DC fan (say 5V). My question is: could a signal generator with a sinusoidal signal of (say voltage 5V and frequency of 5 Hz) be used to ...
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0 votes
1 answer
107 views

Ball and Socket Wheel Concept

I am sure you all remember those prehistoric computer mouses that had a ball under it. I'm looking for any points and tips on how to create a ball and socket wheel that has an almost frictionless ...
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2 votes
1 answer
52 views

Spring Industry Naming Convention

I am currently prototyping a part for a personal project. My CAD design was contracted out and there are some off the shelf parts that I need to order per the design (springs, screws, etc.). My ...
3 votes
1 answer
479 views

Buckingham-Pi Dimensional Analysis when there is a non-dimensional parameter: How is it accounted for?

I am in the process of completing a design project for my fluids course in which Buckingham-Pi /Dimensional Analysis is needed to find the optimal parameters needed to achieve a rotational rate of 120 ...
1 vote
1 answer
137 views

Mechanical tolerances on a CNC machine

I have a project which involving several mating parts and also shaft guided through bearings, my issue here is that I don't have much experience with tolerances and manufacturing processes and I ...
2 votes
3 answers
94 views

Prototype for Injection Molding

Mold for Injection Molding is very expensive and is justified for mass production. However, at Prototype stage, how we make the same part with less expensive method. I know 3D Printing is a way but ...
2 votes
0 answers
32 views

How to measure the inertia of an object using a motor

first time on this board even if I've been lurking for a while. I'm a tennis racquet technician and, for the sake of saving some money and just for the fun of it, I'm trying to build a machine that ...
1 vote
1 answer
143 views

What type of plastic is a good clear, flexible plastic for prototyping? (~0.5mm - 1.5mm thick)

I'm prototyping a hardware that involves many thin walls to bend around curves and such, so it needs to be flexible, cheap, and also transparent. It may also be the same plastic used in a production ...
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1 vote
1 answer
737 views

How to prevent an object doing a full rotation on a shaft

I basically need a block on a shaft to rotate between 90 degrees (vertical) and approximately 180 degrees (horizontal) counterclockwise on a shaft. I don't want the part to fall below 180 degrees. At ...
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0 votes
2 answers
36 views

How to retrofit seed starting trays to prevent root circling

I grow plum trees from pits using seed starting trays: Unfortunately, I have a problem where the roots of the seedlings grow in circles around the bottom of the cavities of the trays. The circling ...
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2 votes
3 answers
135 views

Understanding metalwork manufacture -- How are Purchase Quotations prepared?

I have been involved with a number of metalwork design projects lately and I'm increasingly finding myself asking for quotations for small prototype runs (often one-off jobs) to verify the validity of ...
user avatar
2 votes
3 answers
9k views

How to cut Silicone and leave smooth edges?

We've got drawings for a prototype that we're trying to mimic by altering an original mold of the product. For us to mold it would be quite expensive to just test it to see if it works or not. We're ...
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0 votes
3 answers
335 views

I am looking for some basic mechanical parts to build structures(prototypes)?

I am looking for something like this to make my robot ideas as prototype. But I don't know it's name! Also if there are better options I will happy to know. (source: instructables.com)
0 votes
1 answer
50 views

General purpose automated assembly?

I've been using 3d printers for prototyping for a long time, and I'll admit it's incredibly convenient to be able to throw together a CAD model, send it to the printer, and have it ready to assemble ...
0 votes
2 answers
143 views

What's the name for a kind of gear that slips tightly over the top of another gear and can drive the gear it's surrounding?

What's the name for a kind of gear that slips over the top of another gear and can drive/turn the gear it's surrounding? I'm making a handcranked flashlight with my 7 year old. We're thinking of using ...
2 votes
3 answers
6k views

Converting rotary motion to linear motion (door for sliding trash can)

I have one of these slide-out trash cans: I want the trash can to slide out with the door being opened and slide in with the door being closed. I'm thinking of a method to convert the door opening ...
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2 votes
1 answer
50 views

Prototyping tubular components

I'd like to mock up a quick prototype of a chassis assembly for a type of cart, which, in production, would be composed of CNC bent aluminum extrusions (hollow, approximately 5/8" circular profile), ...
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2 votes
3 answers
639 views

What is the process called for up-sizing a proof-of-concept prototype to full-scale?

What is the process called when you upscale your proof of concept to a full size prototype? For example a traffic light circuit using LEDs to fill size lights and power supply? That is if the term ...
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2 votes
4 answers
934 views

How can I attach a rotary encoder to a retractable dog lead?

I need to know how I can attach a rotary encoder to something string/wire that I can pull and it retracts automatically My idea was to take apart a retractable dog lead leash and affix it to it ...
0 votes
0 answers
39 views

How can I attach a rotary encoder to a retractable string/wire? [duplicate]

I need to know how I can attach a rotary encoder to something string/wire that I can pull and it retracts automatically My idea was to take apart a retractable dog lead leash and affix it to it ...
6 votes
3 answers
682 views

How do you make a 3D print with an accurately aligned bore hole?

I am printing a wheel with a 2.5mm hole in the middle to accept a shaft of a motor with a set screw. The problem I am having is that the wheel is always wobbly when spinning (sometimes more, sometimes ...