# Questions tagged [design]

Questions about or related to design.

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### Involute gear curve when root diameter falls below base diameter

The answer to a question on involute gear curve calculations shows how the gear tooth curve proceeds as an involute calculation from the base diameter. If the pitch diameter is D = m.N where N is the ...
• 347
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### How does the central lock mechanism in articulated arm (magic arm) works?

does anyone know how does the central lock mechanism in articulated arm (magic arm) works? The magic arm usually used to hold camera, with only 1 knob, it can lock all sides. How?
• 103
1 vote
321 views

### Will high velocity air directed underneath a half-toroid shaped Coanda saucer by a centrifugal impeller create a lifting force?

I would like to know if a lifting force will be created by the Coanda effect from high velocity air that is directed underneath a half-toroid shaped saucer by a centrifugal impeller. I am seeking an ...
• 281
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### Design of a Four-Bar Infinity Coupler Linkage

How can I control a Four-Bar Infinity Coupler such that it does not accidentally become a Paralellogram Linkage? It seems to me that, when the bars are all horizontal, gravity could change the ...
• 429
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### Snap-fit design

I'm designing 2 objects that should be attached to each other and removed when it's necessary. So I though about snap-fit as a solution. There is a lot of types of snap-fit but I'm planing to use a ...
• 161
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### Involute Gear Calculation

I've written a program to generate gears and write them to dxf files. I thought all was well until I looked at the mesh of two gears. From everything I've read there should be no backlash when the ...
• 153
2k views

### What is the script function to select Solid Body in ANSYS Design Modeler?

I need to select a solid body in ANSYS Design Modeler, with script, in a design with multiples bodies. With the following command I select all the solid bodies, but this is not what I need. ...
• 205
347 views

### Mechanism for controlling the clamping force

I am working on upgrading a research project on wind energy. They are trying to measure the performance of wind blade designs in a small wind tunnel (i.e. their models are relatively small). What they ...
• 24.4k
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### Properties of an hexagonal shape vs round tube shape

In a bike frame build, are there any differences between hexagonal cross-section tube instead of the typical round tubes? Assuming that both are made from the same aluminium alloy and have the same ...
• 133
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### Would a double helix spring be more or less effective than two springs?

Say I have a spring in the shape of the backbone of DNA. If I unwind the two parts which would have more potential energy when pushed all the way down, the double helical or both of the individual ...
• 135
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### Reverse-engineering spur gears - do I have enough data to make a gear that will mesh correctly?

I'm trying to reverse engineer a set of spur gears that I have on a model RC car, but they are tiny, so there's a limit to what I can measure with my calipers. My plan is to create a new gear design ...
• 133
2k views

### Advice on spring launcher project

I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach \$65.5 \...
• 31
1 vote
195 views

### Choice of Datum Features and Number of Datum Features

Consider a rectangular stock section with a dowel hole and other features of size (FOS) on it. The dowel hole serves to locate the entire part. Should my choice of datum features be what is most ...
• 53
1 vote
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### On modifying imported STL files in Solidworks

Some weeks ago I downloaded a couple of 3d models from Thingieverse in STL format and I wanted to make some minor modifications before printing. The modification were: I wanted to split a multi part ...
• 24.4k
1 vote
726 views

### Braking system for a miniature ‘Drop tower’ rollercoaster

The tower itself is only max 400mm. Designing the lifting system isn’t the problem but slowing down the gondola is posing a slight problem, any suggestions? I have looked into using magnets but I can’...
• 11
1 vote