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Subject: Help making a Steam engine in Bryce with moving parts?

clyde236 opened this issue on Jun 01, 2002 · 1 posts
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clyde236 ( ) posted Sat, 01 June 2002 at 1:04 AM · edited Sun, 24 November 2024 at 11:05 AM

Hi all,

I'm trying to make a simple steam engine model in Bryce that will move like the real thing. My model has 4 parts: Piston Housing, Piston Rod, Transfer Arm and Wheel. I am 90% there, but have one problem. I think I am missing a step.

Here's what I do:

I lay everything out horizontally to make it easier to work with. So it looks a little like this: -- | -- O. The first two dashes (--) are the piston rod, the (|) represents the piston housing, the second dashes (--) are the transfer arm and the O is the wheel. In the model all the edges touch.

So far, if I set the origin point on the Transfer Arm to the end, so it touches the circumference of the wheel, and then LINK the Transfer Arm to the wheel (but uncheck rotation) (as it would be mechanically), and TRACK it to the Piston Housing, I can rotate the wheel, and the Transfer Arm will move properly as I rotate the wheel. The tracking makes it point always to the Piston Housing, which is stationary, while the linking allows it to move with the circumfrenece of the wheel. Step one seems to work okay.

Next, I set the origin point on the Piston Rod to the end where it touches the Transfer Arm. I LINK the Piston Rod to the Transfer Arm (as it would be in a machine), it will then follow the Transfer Arm, I TRACK it -x to the Piston Housing (which is stationary), and it stays in place.

Now, if I rotate the wheel, the transfer arm works properly and the piston rod does move in and out. But it doesn't stay level on the Y axis. It moves up and down, which is unreaslistic.

I must be either too literal here, or am missing something. Basically, I need to trap the piston rod so it can only move side-to-side while linked to the Transfer Arm.

Amy ideas? I have a feeling this can be done easily, and I'm just missing a simple step. Of course, it does work backwards from a real machine (i.e., I must rotate the wheel to make the other parts move, whereas in a machine, I'd move the piston rod side to side and the other parts would move.) and that may be where I am missing the final step.

Any ideas would be appreciated. Is there a clever tutorial I am not finding?

Thanks for your help!

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