topic mechanism using pulleys in Fusion Design, Validate & Document Forum

mechanism using pulleys

chuck767 — Mon, 28 Nov 2022 00:31:01 GMT

I have two pulleys with a belt between them to drive a mechanism.

I cannot figure out how to configure this mechanism using the two pulleys and belt to drive the mechanism

any help would be greatly appreciated

thanks,

Chuck

Re: mechanism using pulleys

Bunga777 — Mon, 28 Nov 2022 00:45:18 GMT

In the current state of Fusion360, the only way to drive pulleys is to use Motion Link to drive them in the same way as gears and sprockets.

Although many tricks have been invented, there is no function that can perfectly reproduce the complex contact drive as a fundamental function, and I feel that the best method for now is to use Motion Link to simulate it.

I too would like to see more of this type of functionality. I hope it will be implemented.

Re: mechanism using pulleys

chuck767 — Mon, 28 Nov 2022 02:06:23 GMT

Thank you for the quick reply. I will not spend anymore time trying to make it work.

Chuck

Re: mechanism using pulleys

MichaelT_123 — Mon, 28 Nov 2022 12:09:33 GMT

Hi Mr Chuck767,

Pulley's type design requires both concurrent changes in the geometry of the mechanism's elements and their synchronized movements.

Unfortunately … in F360 Ultimate, sections of the kernel responsible for these functionalities… seem to be separate, making dynamic harmonization of the design's elements difficult (or even impossible).

However, contrary to some opinions, it is possible to perform a partial simulation of the design, limited to geometrical changes only (without pulleys rotations). It should be sufficient in many cases to properly place the pulley mechanism in a broader design context.

The not-so-good news is that, in general, even such partial simulation, CADing of pulleys will require some calculations and formulas derivations to establish respective userParameters set driving its foundation sketch, … and this might be a daunting task!

I am attaching a very basic/classic pulley design example. I hope that it is self-explanatory. Use the _Rope_Release parameter to pull/release … a rope. Unfortunately, you will not be able to 'rotate' pulley disks concurrently.

Attached files:

Pulley_mono.png 4K_mono ( 0.7MB) https://a360.co/3ikpRV3

Pulley_arcd.jpg 4K_stereo ( 0.2MB) https://a360.co/3ikmtcO

Pulley_mono.mp4 4K_mono (6MB) https://a360.co/3VzD1vO

Pulley_arcd.mp4 4K_stereo (13MB) https://a360.co/3gGWP1z

To be viewed on 4K media devices (monitors, UHD TVs, projectors...) of reasonable performance. For the best experience, use stand-alone media applications (WMP, VLC) and the native resolution 3840x2160 - full screen. The '_arcd' files require an anaglyph red/cyan glasses, while '_al' is for active shutter glasses 3D hardware (~30 deg viewing angle is recommended). Download the files over a network, where the cost of doing so is not a concern. The files are to be used for private, non-commercial purposes only.

Regards

MichaelT

Re: mechanism using pulleys

chuck767 — Mon, 28 Nov 2022 23:16:32 GMT

Thanks for your input, very impressive. I could not get the video of work because of my monitor.

Re: mechanism using pulleys

MichaelT_123 — Tue, 29 Nov 2022 01:19:32 GMT

Hi Mr Chuck767,

I realized that I haven't attached the demo f3d file. I will do it in a few hours time.

Regards

MichaelT

Re: mechanism using pulleys

MichaelT_123 — Tue, 29 Nov 2022 09:27:52 GMT

Hi Mr Chuck767,

Here is the updated pulley…

I repost my previous one in its entirety… as I have found that I messed up with radia&diams 😞. Thus please consider the past attached files as … digital rubbish… and treat them accordingly.

Uffff … nobody spotted it !!! 😂

Hence, we go …

…………………………………………………………………………

Pulley's type design requires both concurrent changes in the geometry of the mechanism's elements and their synchronized movements.

Unfortunately … in F360 Ultimate, sections of the kernel responsible for these functionalities… seem to be separate, making dynamic harmonization of the design's elements difficult (or even impossible).

However, contrary to some opinions, it is possible to perform a partial simulation of the design, limited to geometrical changes only (without pulleys rotations). It should be sufficient in many cases to properly place the pulley mechanism in a broader design context.

The not-so-good news is that, in general, even such partial simulation, CADing of pulleys will require some calculations and formulas derivations to establish respective userParameters set driving its foundation sketch, … and this might be a daunting task!

I am attaching a very basic/classic pulley design example. I hope that it is self-explanatory. Use the _Rope_Release parameter to pull/release … a rope. Unfortunately, you will not be able to 'rotate' pulley disks concurrently.

Attached files:

Pulley.f3d F3D ( 0.2MB) https://a360.co/3XH25Tr

Pulley_mono.png 4K_mono ( 1.2MB) https://a360.co/3iqnyQk

Pulley_arcd.jpg 4K_stereo ( 0.2MB) https://a360.co/3XINYwS

Pulley_mono.mp4 4K_mono (7.2MB) https://a360.co/3ATpAPw

Pulley_arcd.mp4 4K_stereo (25MB) https://a360.co/3XDZsSp

To be viewed on 4K media devices (monitors, UHD TVs, projectors...) of reasonable performance. For the best experience, use stand-alone media applications (WMP, VLC) and the native resolution 3840x2160 - full screen. The '_arcd' files require an anaglyph red/cyan glasses, while '_al' is for active shutter glasses 3D hardware (~30° viewing angle is recommended). Download the files over a network, where the cost of doing so is not a concern. The files are to be used for private, non-commercial purposes only.

Regards

MichaelT

Re: mechanism using pulleys

chuck767 — Fri, 02 Dec 2022 19:59:23 GMT

very impressive !!!

I have determined my pulley system is way too complicated to even try to
simulate it.

thanks for your input
chuck