Spur gear generator/constraint to shaft?

[JoshuaPHewson]

Does anybody know how to get the gear from the generator to be attached to a shaft (the cylindrical face you choose) instead of around it? Do you have to use the shaft generator or can you make a cylinder, extrude it and then somehow constrain it? My gears just spins around (the cylinder face I choose), I want that to turn as well.... anybody know anything about this??

[Anonymous]

Hi Joshua,

There are many different approaches how to place gears. It mostly depends on
type of gears you wish to use. You may place 'modified' gears with fixed
center distance or 'standard' gears and thus let Gear Generator design
center distance for you.

If you need to 'turn' gears within the assembly you need to make spur gear
assembly 'flexible'. You may notice that spur gear generator creates an
assembly and places individual gears into it so you still can leverage power
of the assembly constraints.

Here is summary of possible workflows:

Scenario 1: Standard gears - design center distance:
You may or you may not have axial geometry in your assembly. Select 'Center
Distance' option within 'Design Guide' in Spur Gear Generator. Select
geometry you wish to constraint individual gear to. If both shafts exist and
they are positioned with different center distance you may ignore warning
'Center Distance in assembly is different from calculated'. If accepted gear
assembly should be created as 'flexible' and it gives you ability to release
DOFs of the shaft you wish to move to appropriate center distance. You can
make gear assembly 'non-flexible' thus assembly updates and it moves your
shaft to computed center distance. After you complete positioning of the
shaft you can make spur gear assembly as flexible again.

Scenario 2: Modified gears for fixed center distance:
Although it is not required you may want to have shaft (axial geometry of
the housing) already created and positioned in the assembly. You just need
to change 'Design Guide' of the Spur Gear generator to something else than
'Center Distance'. Your center distance becomes an input parameter. If you
select two axial references it computes fixed center distance automatically.
Spur Gear generator adjusts parameters of your gears with respect to
specified center distance and 'Design guide' as well as other options within
more area of the Spur Gear generator (ie. 'Reaching Center Distance'
option). In case you don't have both shafts in the assembly may need to
create assembly constraints on your own later.

There are also other possible workflows. I assume the bottleneck might
become adjustment of the center distance in the assembly and thus providing
a backlash. This would require some more manual work as Spur Gear generator
currently works with nominal dimensions only. If my description does not
help, please provide a picture or some more description of what you are
experiencing with.

Thanks, Ales Ricar


wrote in message news:6339318@discussion.autodesk.com...
Does anybody know how to get the gear from the generator to be attached to a
shaft (the cylindrical face you choose) instead of around it? Do you have to
use the shaft generator or can you make a cylinder, extrude it and then
somehow constrain it? My gears just spins around (the cylinder face I
choose), I want that to turn as well.... anybody know anything about this??

[JDMather]

>My gears just spins around (the cylinder face I choose), I want that to turn as well....

Short answer - Mate Flush the appropriate Origin Workplanes.

[rjwilliams]

Have you tried using the motion constraint? You can select the gear face and select the shaft and constrain the movement of the shaft to the gear.