# Questions tagged [timing]

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### XL timing belt missing Dimension!

I'm trying to design and 3d print a XL pulley. I think there is a missing dimension that I can't find in the spec tables. we've got pitch circle, teeth height, belt thickness... but I can't find ...
• 111
44 views

### Exceed 'designed' speed ratio of timing belt

I'm trying to create a setup to transfer motion from a motor to a shaft that requires a much higher torque (bi-directional). The housing is about 6 inches long and the speed ratio needed will be ...
• 1,033
30 views

### Understanding a Variable Lift Valve Train Patent

So my father has this patent, and I'm not entirely sure how a certain aspect of it is supposed to be working. I understand how it can be useful, but I don't understand how such a seemingly simple ...
• 101
44 views

### How to estimate the time cost of interrupting a task and picking it up again later

In terms of personal productivity (single machine scheduling) when a task is interrupted before being done in order to switch to a different task, it incurres a 'tear down' time cost - putting tools, ...
• 141
1k views

### How to mount timing pulleys/belts for small DIY project

I'm building a rotating lamp for a small DIY project to learn about motors and timing belts/pulleys. As I am learning, finding parts that are small enough, fit a stepper motor shaft and reasonable ...
• 51
69 views

### air resistor decreasing resistance over fixed time

Imagine I'm breathing through a wide straw/tube in my mouth. At the far end of the straw is a resistance mechanism. I want it to be that as I exhale there is no resistance, but as soon as I start to ...
• 103
1 vote
1k views

### How to design a gear escapement like in an old pendulum clock?

I've already got a gear that has its teets as in the picture: I want to create the mechanism from the picture, but it's harder than I expected. I think my gear is not the problem. But I'm not able to ...
• 111
100 views

### Is there a device like this? [closed]

I would like to get my hands on a mechanically-set timer (wind up is fine, so that it's self-powered) which sends a small electrical pulse to a mag-lock once the timer goes off, thus causing the mag-...
• 111
1 vote
298 views

### Timing belt transmission with lateral pulley movement

What is the correct way to allow for lateral movement of a timing pulley in a transmission system? For example, there are four pulleys, one of which has to move up and down. Is there standard ...
• 129