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4 votes

How did Al-jazary's "castle clock" work?

There is an excellent description of the castle clock in this article on muslimheritage.com. It describes the full workings of the clock, including all of the mechanisms for things such as doors ...
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4 votes

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

The mechanism is called an "escapement", and part of its function is that the gear imparts energy to the swinging teeth in order to keep the pendulum (or whatever) moving in spite of any frictional ...
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1 vote
Accepted

Is there a device like this?

In principal it should not be very difficult to adapt an off the shelf mechanism like a mechanical alarm clock or kitchen timer. They will already have some sort of latching mechanism to activate the ...
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1 vote

Timing belt transmission with lateral pulley movement

It is common for timing belt systems to have a tensioner pulley, effectively an idler mounted on a sprung radial arm. In most situation this is just to take up slack from wear and stretch and ...
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1 vote

XL timing belt missing Dimension!

What you want is called the belt's neutral axis. The neutral axis is what coincides with the pulley's pitch circle. You have to look this up for each belt, because it depends on the way the belt is ...
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  • 3,590
1 vote

Understanding a Variable Lift Valve Train Patent

The rotation of shaft 119 with the cam changes the load on the valve springs, but it also changes the location of the fulcrum of the lever assembly parts 101, 103 and 104. As the bulk of the cam ...
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  • 6,282
1 vote

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

The amount of information you specified is too limited. If you had more information, maybe you could do it, but not as stated. Machining tasks can vary greatly. I can imagine some parts where it ...
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  • 2,511
1 vote

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

No, because the number to be produced changes the percentage ie the setting up time can be longer than the machining time for 1 piece but 3% for 100 pieces and 0.003% for 1000 pieces...
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1 vote

How to mount timing pulleys/belts for small DIY project

I tried both ways, idlers and slide, with and without additional spring. A) Idler with spring tends to oscillate when load torque is not constant (it is rarely constant). B) Sliding motor and spring ...
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1 vote

air resistor decreasing resistance over fixed time

Use a flap valve - allows air out and if you design the "catch" correctly then won't allow air to pass until a certain load or depression is achieved.
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