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Al's Automata Blog

Worms Coming Out of the Woodwork!

4/30/2017

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There's a few extra worms scattered around the Sleptin automata. Here is a couple of fellows lounging around in the mechanism.
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Gluing Camshafts

4/29/2017

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Here is the glue up of the main cam shaft of the Sleptin automata. I'm showing this because you will notice that the internal partition wall is part of the assembly. The gear on the right is already glued on as are a number of the cams on the left. In fact, the shaft support on the left end had to be slid on before the final piece, the Geneva wheel. Once dropped into place the partition and pedestal support are screwed to the base. You have to consider the assembly process as you go. Here you can also see a small pedestal glued to the portion instead of the base. 
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A Space Well Slept In!

4/24/2017

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Well here's the major chunk of the space filler, a little Sleptin who slept in, thanks to some input and inspiration from William. Needless to say the sleepy little bird has been named William.
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An Unsatisfactory Space Filled!

4/23/2017

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I have found the content to fill the unsatisfactory space mentioned a few blog entries ago. I have adopted a suggestion from William, a visitor to my blog. The content is under construction, but I will wait until it's closer to finished before posting a photo.

Thanks for your input William.
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A Wormy Automata Handle!

4/23/2017

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I've been jumping around on this project! Here's a worm handle I knocked off yesterday. It will get a coat of paint and a smiling face. Why wouldn't a worm smile in a community of Sleptins.
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An Unsatisfactory Space!

4/18/2017

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The last blog showed how the mechanism on the left was put together. You can see three worm holes, including the one the little bird is intently watching, although no worm will appear there. There is third worm which rises out of the apple core in the rear.

Setting the top works in place to confirm assembly measurements brought something to my attention I suspected all along. The right end of the top seems empty. I can't add any moving bits above the gearbox as there is no room below.

In hindsight I guess I have just gotten too comfortable building this gearbox design for many of my projects. If I had distributed the gearing across the entire piece I think I  could have shortened the case by almost three inches, eliminating most of the space. It would have been tight but I think it was possible. Well I'm far enough along that I think filling the "space" with something will be easier than a redesign; the question is with what.

I'll have to think about this!
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Assembling Cams on Shafts

4/17/2017

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One of the more nerve racking tasks for me in making automata pieces is doing the final glue-up of the cams on the shafts. There are so many ways to slip up! Here's the shorter shaft from my current project being assembled. It is run off the main shaft through a Geneva mechanism. It controls three worms and one baby Sleptin chick. As the little bird peers down a worm hole looking for dinner, other worms around him pop up out of the ground. When he notices and turns to look, the worms quickly dive back down into their holes.

The photo below shows the left end of the automata. The left end plate and top plate have been removed for the photograph. You can see the main shaft, no cams install on it yet, in the upper centre. On this side of a main shaft support is the Geneva wheel. The main shaft terminates in this wheel. In the foreground is the short secondary shaft, lying on the base with the Geneva star already installed on the end.

I always install the pedestals and followers before fitting the cams. The followers have been "tuned" and mounted to the pedestals which have been glued to the base. The pedestal on the left front has the followers for worms #2 and #3. They will be connected with a 3/64" brass wire to a dowel which will support the worms. The next follower, closest on the right,  is the follower for worm #1. The last one is the follower that causes the little Sleptin to turn and look. It has a roller to run on the cam to reduce friction since the cam has a fairly steep profile to overcome to give the desired  motion. It also helps because it running away from the hinge point which can be problematic dynamically.
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So here is the routine I follow in this case. Slide the next cam onto the shaft, The right way of course! Now check it again! Put the shaft in place, and put the left end up. Slide the cam to line up with the follower. Flip the follower over so it sits on the cam and make the final adjustment in cam position. Mark the cam position with a pencil on one side of the cam, in this case the one facing the left end. (toward bottom of photo). Rotate the cam by hand to make sure it does not hit a pedestal, or anything else for that matter!

Now disassemble the case and remove the shaft and cams.  Using the photo below as a reference, I slide the cam to the left, put a bead of thick CA glue to the right of the line and push the cam into place. Of course before you do this you must know the rotational position of the cam, relative to the others! As the glue is setting rotate it in 90 degree steps and use a small square to make sure it is fitted squarely to the shaft. The photo below shows the assembly sitting on the case for the purpose of taking the photo. I usually do this in my hands. Once the CA has frozen the cam, turn the assembly on end and put some thin CA on the back face of the cam to fill any voids around the shaft. I finish up with a little thick CA glue to build a little fillet.  The cam should now have a filet of glue on both sides. Now just keep repeating the as you go along  the shaft one cam at a time.

SO REMEMBER...
1. Cams on the right way,
2. Align with the followers,
3. Turn to check for interference,
4.Rotated to the correct position,
​5. Glued on squarely to shaft!
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So here's what this area looks like when fitted up in the photo below. The shaft and cams are almost invisible behind all the followers and pedestals. Notice the links to the vertical dowels which have the worms mounted on the other ends. Each of the worm dowels has an extended  guide on the bottom of the top plate so they side more smoothly. If the sliding length is to short, the dowels can bind. They will be waxed for lubrication on final fit up. The 1/8" dowel on the right is the one that turns the baby bird. It will have a guide added to the top plate for it as well. The brass wires will also be bent to final shape for locking later.

Some observant readers may have noticed the extension that has been added to the follower that turns the bird between photo 1 and 3. I must have messed up the calculation, since the bird did not rotate as much as I planned . In this case, with enough spaee been the follower and the top plate, I was able to add a 1" extension to the follower to raise the link position. More vertical height translates to more rotation.

​I hope this was interesting, and answered some questions.
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A Box of Bits and Assembling a Sleptin.

4/9/2017

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I've been silent for a while. Sorry. Back in the city for a while. I have been working though. Here is a box of parts some subassemblies and parts I've been cutting out.  There are legs, cams, gears, pedestals, some of which are assembled with the followers, spacers, and assorted other goodies. The case is now cut out, and tomorrow the holes will be cut into the top plate. I will install the gearbox and shafts as well, and test run the power parts. If everything goes well I'll start mounting the pedestals.
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In the meantime I've been working away on the assembly of the large Sleptin. The wings have hinge pins that insert into little blocks ahead and behind the wings. These blocks are glued into the back of the bird. Then the blocks are shaped into the body. In this photo taken after a first coat of paint you can still see the edges of the blocks. They are 3/8" wide. The wings have a rudimentary feather pattern and they been Inked to accent the detail. It is necessary to assemble these as I go in finishing the bird.

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Below is the underside of the bird. The beak has a first coat of paint on it, and the inside of the mouth has been painted flesh colour. When the bottom beak piece is installed you will only see inside the mouth when the beak is open.
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Automata Bits, The Why and How of It!

4/3/2017

1 Comment

 
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I've added a new page to my website, under "Mechanisms, Tips & Tricks" called the "The Why and How of It" where I explain why I do certain things, and how I do others. It's meant to be a primer to those looking to learn how to make automata.  I'll just keep adding bits as I work along that I think will be of interest, or answer questions from readers.  So take a gander. I hope you find it interesting and instructive.  If you have a suggestion for content let me know through my contact page and I'll be happy to consider writing it up.

Here's a link to the new page. "The Why and How of It."
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    Why Automata?

    Automata is a creative blend of my life interests , engineering, art  and woodworking. 

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Home     Contact    About   
  • Automata Blog
  • Home
  • Tubing The River Styx
  • DJ's Bee Bop Palooza
    • Roles of Bees in a Hive
    • The Bee Bop Characters
  • Automata Gallery
    • Swimming With The Dolphins
    • A Boat, A Boy, And A Dog
    • The Invisible Audiophile
    • Black Bear Bliss
    • Parking Lot Wars
    • The Chase
    • Baa Baa Bad Sheep! >
      • Baa Baa Bad Sheep Photo Gallery
    • The Penguins' Revenge
    • Cirque de Poulet
    • I'm Thinking & Laura
    • The Bipolar Brain
    • Tempest in a Teacup
    • Inner Demon
    • Sewer Rat Symphony >
      • Musican Profiles
    • The Captive
    • Bored Out of My Skin
    • Waiting at the Clinic
    • The Diagnosis
    • Snowbirds
    • The Not So Early Bird - The Common Sleptin
    • 1 HP Heart Pump
    • The Trojan Cat
    • 7-1/2 Horsepower
    • Howdy!
    • The Bus Stop
    • Rhinoceros Racing
    • It's an Uphill Battle
    • When an MRI Goes Badly
    • A Moment of Silence
    • Who Slew the Chicken?
    • The Dentist's Office
    • Owl Hijinx
    • Horse of a Different Colour >
      • Horse of a Different Colour Features & Specs
      • Horse of a Different Colour Photo Gallery
    • March of the Penguins
    • The Extraction >
      • The Extraction Media Gallery
    • Poultry in Motion
    • School's Out!
    • Pond Life >
      • Pond Life Photo Gallery
    • Rat Co. >
      • Rat Co. Employee Profiles
      • Rat Co. Photo Gallery
    • Happy Birthday Daddy! >
      • Happy Features & Specs
      • Happy Birthday Photo Gallery
    • The Raving Fans
    • The Waiting Room >
      • Waiting Room Photo Gallery
    • Cottage Cabernet
    • Neighbourhood Watch
    • Check Please!
    • Fishing >
      • Fishing Photo Gallery
      • The Mechanism
      • Brutus the Catfish
      • Crawford the Crayfish
      • Bigmouth the Largemouth Bass
      • Buddy the Chocolate Lab
      • Gertrude and Heathcliff
    • Ian's African Lion Safari
    • Call Before You Dig >
      • Features & Specs
    • Crossing The Mara >
      • Features & Specs
    • Migrating Caribou >
      • Features & Specs
    • Rocket Pack Raccoon
    • Urban Terrorists >
      • Exploring the Urban Terrorists
      • Features & Specs
    • Top Gun
    • Miss Communication
    • Hula Hoop Girl
    • Java Jane
    • The Cranky Caterpillar
    • A Case in Point...
    • The Leafs Score!
    • Enough With The Fish!
  • Learning Centre
  • Automata Store
  • Workshop Tour!
    • Sanding
    • Drilling
    • Cutting
    • Measurement
    • Carving Tools
    • Hand Tools
    • Working With Brass
    • Work & Assembly Areas
  • Mechanisms, Tip & Tricks
    • The Why and How Of It!
  • Who Am I?
    • Making Automata
  • Contact Me
  • In The News
  • Links
  • The South Bay Railway
    • Murray's Mill
    • Rivers, Creeks & Ponds
    • Early Days Photo Gallery
    • Layout Photo Gallery
    • Layout
  • Totems
  • Some Other Small Projects
    • Misc Projects
  • Driving Home for Christmas
    • Designing the Float
    • A Penguin Prototype
    • The Human Flock
    • The Float Penguins
    • The Float Video
  • Members Page