GearHeads Forum

Bill:

Problem seems related to fusing. The shafts on the objects are not in place properly, you'll find them almost impossible to select.
So when run is pressed, they move quickly to position causing weird forces all over., Im trying to reproduce an dIll see where that leads.

Art

Bill:
It appears top be related to the pinions. The crash can be stopped by deleting the bottom right bevel, but all the pinions seem to be creating the
rotational instability. Have a few web issues to deal with, but Ill look into it shortly.

Art

Thanks Bill:

Im looking into it.

Art

Art

I'm not sure if this is an issue with v2.05B or my system.
This link https://drive.google.com/drive/folders/1EnF9g-m1tLCxro6CurBnzTIGiSaftoaU?usp=share_link is to a folder Titled Bevel Gear Instabilities.

I've noticed in the past that when I place an object such as a balance from a tass file that the model was not stable. I figured at first that the problem was the tass file. I decided to experiment with bevel gear that have a 10:1 gear ratio.

I've created two projects: BevelGearExperiments and BevelGearExperimentsV2.

I use the Ticker bevel gear creator to make the upper left gear set. After that I use the "copy Selected" tool to create the other three gear sets.

In BevelGearExperiments the upper left gear set has its pinion powered at 100rpm. In the upper right set I turned the wheel vertically and also had its pinion powered at 100rpm. The lower left and lower right gear are similar except that motors have been attached to the wheel and are 10rpm. I run the simulation at 100% motor speed so 10rpm or 100rpm are the actual rpm's. The upper two gear sets driven by the pinions become unstable whereas the lower two gear, sets driven by the wheels, appear to be stable.

If I fuse the upper right wheel shaft to the workbench, Ticker crashes.

BevelGearExperimentsV2 is almost identical to the first experiment. This time I loaded the BevelGearExperiments project and used the "copy selected tool" to mount the wheel to the upper left pinion, saved the file as BevelGearExperimentsV2 and then ran the simulation. The simulation ran. When I restarted ticker, I loaded BevelGearExperimentsV2 that I had just saved....Ticker crashes as soon as I try to run the simulation.

Quite puzzling .

BillM

Art

I loaded V2.05B and the crash problem is no longer there. Under 2.04B, the file A-AutoPlaceBevels02 loaded but crashed when I tried to run the sim.

I'm trying to figure out something with sharing links to files on a google drive. As I build more extensive examples, even zipped versions of project files will exceed the allowable attachment size of messages.

The following is a link to a folder Named "Experiment to place Spur Gears Manually"
https://drive.google.com/drive/folders/1tnuqtDKTHqyOhMLnfQzOeiIDs8KaaqPm?usp=share_link

The folder contains two project files. One project has a pair of spur gears placed automatically by the Ticker software.

The second project file contains the same two gears except that I placed the pinion manually. The shaft spacing is calculated to be 23.11 plus an additional .17mm. Although the gears appear to move they are in fact not really meshed during simulation.

How is the gear placement done by ticker that is different from attempting to place the gear manually? I've turned on Wireframe when running the simulations. The wireframe surrounding the gears appear to be approximately cylinders rather than something that follows the outline of the gear teeth. I think I'll have to look at some of the other project files that come with Ticker to see what the wireframes look like on other objects.

Bill Michael

Bill:

I do see the log has broken in your logs, I just uploaded a fix for that.

Art

Bill:

Hmmm, fopr some reason, both of these files load and run fine. Does one crash at load for you, or when sim'ed?

Art

Thanks Bill:

Ill let you know what I find.

Art

Art

I'll give it a try again. Hopefully the file will stay attached this time.

I don't know if there is any good way to deal with coordinate systems when dealing with rotational vector transform matrices. I'm a bit familiar with inertial systems dealing with roll, pitch and yaw and having to know the gimbal order of operations and also having to define if it's a right handed or left-handed coordinate system.

Bill Michael

Hi Bill:

I think you forgot to attach the files, ..

>>If I first select the pinion and then the wheel and Translate On Plane changes in X moves the pinion along the Z axis, Y moves it in Y, Z moves the pinion along the X axis is this normal?

The translation directions are localized. Z means up or down a shaft no matter the orientation, X,Y are orthogonal to the Z axis. There is
no "right" or "wrong" to this axis system, I'm not sure it'd be better to have it locked permanently to the actual world XXZ axis or define it as Left,Right and Z down on shaft as a paradigm.. Im open to thoughts on the subject. Interface in this type of program is truly difficult to determine as to what's more intuitive or easy. I often try many things just to see how they feel..

Repost the files and Ill let you know what's crashing..and stop it from happening again.

Art