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18th April 2017, 10:50 AM #16Senior Member
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Thanks very much Jim, for your ideas. I am always looking at ways to make things move, so anything is of great interest. One aspect of all my automatons is that the viewer is involved, connected with it, because of direct involvement with the piece through the handle operation. So far, my experience shows that simplicity is the most difficult thing, overengineering is easer in some ways. With the Grandpa automaton, the fart engine is much more complex than it needs to be, highlighted by learnt lessons since that piece.
Today I am hoping to complete the leg/arm controls and post clear detail photographs of how it works. Nothing is set in stone with any aspect, my waste bin is full of rejects......
Regards, and thanks for the drawing !
Gus
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18th April 2017, 05:21 PM #17GOLD MEMBER
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Good stuff Gus.
If your waste bin is full of rejects - your final outcome will be truly magnificent
Look forward to your next post
Regards
Keith
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19th April 2017, 10:19 AM #18Senior Member
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WIP - Leg and Arm movements
The brass skeleton is now buried by the timber bits posing as a body. The cables and attachments are still prototype because everything will be disassembled for finishing and reassembled with new. That process destroys some working components, in some ways that creates a "new" and "finished" prototype.
This photo of the left leg rear shows how the knee bending is achieved by cables. It is how our muscles work. Fixed to a post below the knee, the other end is guided through the leg to the front through a brass tube. This end is fixed to the torso. When the leg rotates, tension is created, pulling the cable taught bends the knee. At the top of the leg, a cable which controls the arm movement can be seen. The arm return is by a small spring inside the torso. The right arm will be fixed, holding a briefcase.
Attachment 410536
The piano wire straightens the knee once the tension is released. Above, the cable post for the knee bend cable can be seen. The right leg at this point is already on its way rearward.
Attachment 410537
This video is of the control mechanism for the leg and arm movements. The white arms are controlled by a pulley driven pivot. Each leg rotates via a brass tube passing from here into the body. The left leg tube is inside the right leg tube, a fortunate aspect of the US manufactured brass tube, all sizes telescope beautifully.
Attachment 410538
The end result.
Attachment 410539
Inside the wheel, the character is going nowhere....
Attachment 410540
Next comes the fun of creating the mouse and its movement mechanisms.
Thanks for looking,
Gus
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19th April 2017, 10:20 AM #19Senior Member
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19th April 2017, 05:37 PM #20GOLD MEMBER
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Gus
Cannot open your attachments - is anybody else having that problem ?
Regards
Keith
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19th April 2017, 06:38 PM #21Senior Member
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19th April 2017, 08:09 PM #22
I have Steven looking into this problem so not going to try to fix it right now as neither he or I have been able to duplicate it, so need one that's not fixed to check out.
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21st April 2017, 12:59 PM #23Senior Member
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WIP - Missing vision
Perhaps we get lucky with the photos and videos .....
Leg rear.JPG
Leg detail Rear
Leg front view.JPG
Leg front detail
Rear Controls.mp4
Rear Controls
Running.mp4
Up and running
inside view.mp4
And, getting nowhere.
Thanks for watching,
Gus
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22nd April 2017, 12:26 PM #24GOLD MEMBER
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You are a genius Gus
Regards
Keith
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30th April 2017, 02:22 PM #25Senior Member
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WIP - The Cams
The mouse is carved and installed in its place. I would like to keep those details in the dark to maintain a surprise.The mouse movements are controlled by two cams, and associated cam followers. The camshaft with the main gears are also finalised, in this photo those are seen.
Attachment 411399
The cams are in contact with the followers, the jarrah pieces below. The critical thing about the cams in the automata is the information they contain.
First the blank cam is marked up with timing marks, in this case, seven seconds of active operation. The rest is idle rotation.
Attachment 411400
It is installed into the camshaft, attached by the followers to the element they control, and the desired movements marked on. This is a time consuming job, more often than not resulting in a new cam if the marking doesn't do what the intention was. For that reason, I usually make two identical cam blanks. If it works as intended, the blank is cut by copying the by then marked, remarked, revised, recut, added to, original.
Attachment 411401
It is then cut on the scroll saw, reinstalled for testing. Luckily, in this case only two modifications needed to be done, it works as intended.
The next phase is to connect the mouse cage mechanism to the crankshaft via pulleys.
Thanks for looking,
Gus
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30th April 2017, 05:17 PM #26
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30th April 2017, 07:20 PM #27Senior Member
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Missing Photos
Hopefully, they will appear ! Thanks Peter for the warning !
Gear & Cam blanks.jpg
Cam Timing Marks.jpg
Marked up cam.JPG
Can be read in conjunction with the previous post,
Gus
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1st May 2017, 10:11 AM #28GOLD MEMBER
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Great work as always Gus
As with Peter - I couldn't get attachments to open either
Keep up the top work mate
Regards
Keith
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6th May 2017, 04:23 PM #29Senior Member
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On its own, the original setup to move the legs worked fine. Once other cams and gears were added, the relatively minor problem with its operation became pronounced, leading to its membership of the rejects bin.
This photo is how it was, driven by a pulley to an arm which was the other end of the belt. At "top dead center", just as the two arms swung to the other side, there was a slight jerkiness, as if there is an obstruction, or a tension at that point.
Original Leg mech.JPGOriginal Leg Mech side view.JPG
That translated via the belt to other components.
The rebuilt mechanism is actuated by a cam below, different geometry, the problem disappeared.
There is nothing surprising in this rebuild, it is a normal procedure with automatons, at least for me. I have used in this automaton, three gears which were built for earlier projects and rejected for some reason. All grist for the mill..
Leg Mechanismmp4.mp4
Thanks for looking,
Gus
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6th May 2017, 05:49 PM #30GOLD MEMBER
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Looks nice and smooth Gus, TOP WORK
Regards
Keith
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