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Author Topic: Gears and specialized indicators used in a E Howard Co Tower Clock simulation  (Read 3154 times)
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BillM
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« on: June 15, 2016, 06:44:49 PM »

Hi Art:

I created a large simulatio n of an E Howard Company Tower Clock earlier this year using Gearotics .  This simulatio n is being used to document the design of an existing tower clock.

The goal of this post is to not only share my large Gearotics simulatio n model of the tower clock  but also to share custom indicator s and a gear library that I created in support of the simulatio n model.  The model is stored on a google drive and the following  is an unrestric ted link to the GTH file because the file is too large (size ~100MByte) to directly post on the forum.

https://drive.google.com/open?id=0B8aAv2d26osiSzUyd0J0TGp5WHc

Included in this post are :

1. Jpg of my EHowardCo Tower Clock Simulatio n
2. PDF  EHC-Simulation-2016-0606
3. PDF  MyCustomI ndicators -2016-0606
4. ZIP   MyGearDat a.zip

EHC-TowerClockSim
The first attachmen t jpg is a screen capture of the model.  If this strikes your interest then read the next two PDF files.

EHC-Simulation-2016-0606.pdf
This file describes some of the design features and trade-offs that I made while construct ing the model.   I do plan to write-up a functiona l descripti on of the operation of the clock at a later date.

MyCustomI ndicators -2016-0606
I created some custom "indicator s" to dress up the tower clock model.  This document describes the purpose and use of the various indicator s.

MyGearDat a.zip
Contains the following folders & subfolder s:
     EHC-SimulationFolder
          EHowardTo werClock-GearLibrary folder: gtlib files of gears contained in the simulatio n
          EHC-MotionWorks.gth --  a small subset of the overall simulatio n that shows the motionwor ks of the EHC tower clock.
          Simulated-3D-Vane.avi -- video  focused on a subset of the full model.
     MyCustomI ndicators folder contains DXF files of the "custom indicator s" used in the simulatio n.

Bill


* EHC-TowerClockSim.jpg (111.53 KB, 1362x851 - viewed 227 times.)
* EHC-Simulation-2016-0606.pdf (69.75 KB - downloaded 121 times.)
* MyCustomIndicators-2016-0606.pdf (65.18 KB - downloaded 106 times.)
* MyGearData.zip (1318.85 KB - downloaded 114 times.)
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ArtF
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« Reply #1 on: June 16, 2016, 06:41:25 AM »

Bill:

 Very nice. Is that flutter wheel used to simply slow the chiming chain? Good idea there...

 As usual from your end, much better than I could have done, your a patient crafter..

Art
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BillM
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« Reply #2 on: June 16, 2016, 07:57:03 AM »

Hi Art

The "flutter wheel" is trying to simulate the look of a vane.  The vane on the clock serves as a governor for the strike side of the Tower Clock via air braking.  The angle of the vanes are adjustabl e which would change the speed of the strikes.

Did you have a chance to try the download link and look at the actual sim model?


Bill
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ArtF
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« Reply #3 on: June 16, 2016, 10:17:27 AM »

Bill:

  I did, looks very good. I really must try to make those sims shorter files some day, but then they contain a lot of info on each gear..

Art
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BillM
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« Reply #4 on: June 16, 2016, 06:10:52 PM »

Hi Art

I kind of hope that publishin g such a large simulatio n model might inspire the Gearotics newbies to explore the various features built into the program.. .especial ly the ability to match existing gears either from physicall y measuring gears or getting general specifica tions from drawings or published photograp hs.

For example, the motion works in the model was based on a photograp h my co-worker took while examining the E Howard.  I made a best guess estimate of the larger gear's size, counted the number of teeth in the gear, knew the desired 12:1 reduction and then played with Gearotics features to create the approxima te gear pairs.  When we get to overhauli ng the motion works I'll get a chance to see how close I came to the real thing.

I've been for most part sitting quietly on the side reading the posts & responses on the forum.  It does take a lot of studying, trial and error to learn features and capabilit ies of Gearotics but well worth the effort.  The youtube videos that you posted are quite useful in learning Gearotics .  There were many times when I first started using Gearotics that I was tempted to ask in the forum how to do or accomplis h something ...but what's the fun in that.   I've always loved the challenge of learning new topics or gaining new skills.

When I retired in 2007, I considere d it more of a graduatio n than an ending.  I've been exploring new topics ever since.

Bill
 
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ArtF
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« Reply #5 on: June 16, 2016, 07:57:36 PM »

Bill:

  Well, youve done well.

>>When I retired in 2007, I considere d it more of a graduatio n than an ending.  I've been exploring new topics ever since.

  Me too, its where Gearotic comes from really..  I use Gearotic ( and Auggie) as base frames to hold various experimen ts I do, its why strange things like Web->3d exist or celtic knots or slicing, just things I happened to get intereste d in during the journey.

 There ARE quite a few things in Gearotic poorly explained, or even hidden or not turned on. On the other hand for its
primary purpose of designing and machining gears its pretty well explained . Eventuall y I hope to turn more on, and tie things together better. It actually has modules for things like image segmentat ion and digitial subtracti ons and such, I just never got around to providing a way to use them. Theres just so many interesti ng things to explore and so little time to code.

  Great work, its quite a simulatio n, Id imagine the education has been fairly extensive ... Smiley

Art


   

     
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