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Author Topic: Possible to change properties of a gear in the project?  (Read 112 times)
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vwnerd
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« on: January 07, 2017, 12:04:31 PM »

Forgive me if this is not the correct place to ask this, but I'm wondering if it's possible to quickly change the propertie s of a gear (number of teeth and thickness, in particula r) that has already been added to the project?  I know I can send the gear to the designer, change the propertie s there, then re-add it to the project, but I need to then remove the gear that I no longer want and manually re-link everythin g up.  I have a model I've put together, and deleting/adding/re-linking is a pretty cumbersom e process for experimen ting with tweaking various ratios in the model.  If there's an easier way that would sure help me a bunch.

Thanks in advance!
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ArtF
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« Reply #1 on: January 07, 2017, 01:30:14 PM »

Hi:

  Im afraid thats not possible in Gearotic. The only way it can be done is to delte the gear you wish to change,
and then add a new one and relink. This is because of the unlimited changes it can create on many systems,
centering changes and such usually invalidat e everythin g forward of a linkage. Because of this complexit y, I havent
as of yet anyway added any way to feed forward changes to the system from resizing a gears ratio..

  You can replace a pinion gear with a larger one for example , relink them into the proper chain, then do a "Move on gear" call
on the larger gear. It "may" fix up the remianing items as it will try to recenter and such, but meshing issues may
be evident in the simulatio n on the new gear. If its just a matter of distances, then performin g a "move on gear"
with the new meshed gear may fix up centering issues as it rotates anything attached to the moving gear at
the same time. Thats about all one can try though in that area..

  If your using the shaft the gear your replacing is on, and theres a new center distance, then it isnt possible
to do anything, all forward gears would need to be deleted.

   If you just need a new ratio between two gears, then the best method is to remove both, calculate a new
module for two gears with the new ratio so they have the same center distances, then add them on
to the appropria te shafts, then delete the originals and relink.

  I will consider an option to just replace any two gears with a set center distance with any two others with
the same distance. .and have the system retain the links..

Art
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Thanks, have fun,
Art
vwnerd
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« Reply #2 on: January 07, 2017, 02:16:20 PM »

Hi:

  Im afraid thats not possible in Gearotic. The only way it can be done is to delte the gear you wish to change,
and then add a new one and relink. This is because of the unlimited changes it can create on many systems,
centering changes and such usually invalidat e everythin g forward of a linkage. Because of this complexit y, I havent
as of yet anyway added any way to feed forward changes to the system from resizing a gears ratio..

  You can replace a pinion gear with a larger one for example , relink them into the proper chain, then do a "Move on gear" call
on the larger gear. It "may" fix up the remianing items as it will try to recenter and such, but meshing issues may
be evident in the simulatio n on the new gear. If its just a matter of distances, then performin g a "move on gear"
with the new meshed gear may fix up centering issues as it rotates anything attached to the moving gear at
the same time. Thats about all one can try though in that area..

  If your using the shaft the gear your replacing is on, and theres a new center distance, then it isnt possible
to do anything, all forward gears would need to be deleted.

   If you just need a new ratio between two gears, then the best method is to remove both, calculate a new
module for two gears with the new ratio so they have the same center distances, then add them on
to the appropria te shafts, then delete the originals and relink.

  I will consider an option to just replace any two gears with a set center distance with any two others with
the same distance. .and have the system retain the links..

Art


That makes sense, thank you for the thoughtfu l reply.  I appreciat e the complexit y it would entail, even if you were willing to accept the downstrea m chaos it would cause in most cases.  I wonder about a separate mode in the applicati on that would let you prove out ratios in complex trains in more of an abstract way, to avoid some of those headaches while still allowing some free experimen tation.  In my case, I'm designing an orrery and it's perhaps an unusual case where the goal is to approxima te ratios occurring in nature.  There is a broad spectrum of options for designing an approxima tion of the system, entirely depending upon the desired level of accuracy.  It's very time consuming (and error prone) designing this system on paper, and Gearotic has been a godsend in this regard.  I modeled one of the simplest options (perhaps second only in simplicit y to the design using Ferguson's Paradox) I could come up with, and am now trying to find any "low hanging fruit" there might be in that model for improving the accuracy of some of the ratios... trying to find that balance between simplicit y of design and ease of manufactu re, versus acceptabl e accuracy.

I'm a software engineer by day, so I have some pretty deep appreciat ion for what you've been able to achieve with this product.  It's a wonderful tool and clearly a labor of love.

-Max
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