Date   
Re: What's On My Bench - The head of Medusa

 

Hi Randy...
This is sweet!  I like the mechanism.  What is on the bench...Arduino...Raspberry?
Did you create the head software?  Or is there a library of that kind of stuff?
My understanding is that all of that is 3D printed.  Very nice.
Cheers
-Jim-

On Tue, 10 Dec 2019 at 15:16, Randy <rglissmann@...> wrote:
I've been working on a vertical motion for several weeks. I thought it would be easier but Murphy has touched every aspect of the design. Medusa is supposed to rise and then her eyes will glow. The 3D printed mechanism has been running for a day now so hopefully it's finally robust. Click to view it.

Re: What's On My Bench - The head of Medusa

Mike
 

Randy, that is spectacular, eye popping and simply amazing. I will be watching the progress on this one for sure!
--
Looking forward to hearing about your automata adventures!


Mike

Wooden Curiosities

What's On My Bench - The head of Medusa

Randy
 

I've been working on a vertical motion for several weeks. I thought it would be easier but Murphy has touched every aspect of the design. Medusa is supposed to rise and then her eyes will glow. The 3D printed mechanism has been running for a day now so hopefully it's finally robust. Click to view it.

Cranky Crab Spiral Drive

 

Good evening all...
I was on the Cranky Crab website this morning and notice this neat little Spiral Drive...it's like a spiral worm gear.
This little item would make a good 'point of interest' on an automata.  I wonder how it is under load?
Cheers
-Jim-

Re: What's On My Bench - Colorado Christmas

Mike
 

I'm a bit behind schedule due to procrastination and equipment issues, but plan to finish the mechanisms in the next couple of days.
--
Looking forward to hearing about your automata adventures!


Mike

Wooden Curiosities

Re: What's On My Bench - Colorado Christmas

 

Hi Mike...
How are you doing with this?  Meeting your Christmas deadline?
Always lots to do this time of year.
--
-Jim Coffee-
creating automata near San Diego, California
one of the group moderators
JamesCoffee.com

What's On My Bench: Electric Chair, Back Walls

 

Good evening all...
I am making progress with the Electric Chair. In the image you see the two bipeds (minus their heads), the electric chair, and two back walls.  The back walls contain a clock (the minute hand moves one minute) and the execution counter (it advances 1 time each execution).
As I've explained, I want to be able to lift this whole top assembly off of the drive frame (just undo some screws and then lift it off).  This has required me to have the motion transmitters and receivers not interlock, and that the motion receivers on the top assembly cannot require more than 1/2" of vertical motion.   Particularly for the chair shaker this was a bit of a challenge...but in the end I've got three of the five required motions constructed.
I'd like to take just a minute to address the subject of "The Electric Chair".  As I speak with friends about this piece of art some of them become uneasy...they think that this is a bit dark.  But, we always have an interesting conversation (because of the automata).  It causes people to think.  To me this automata is a story and it's also got a bit of dark humor at the very end.  It's not going to be a happy piece...just a realistic piece.  I am enjoying the engineering challenge and do not feel bad about creating this piece.  It's interesting to me.  I like that it is controversial.
And I would like to address a series of automata THAT I WILL NOT create.  For decades I've been aware of the way that we humans treat each other.  We can be wonderfully good...and we can be horribly bad.  I had been lightly considering doing an automata series about the torture devices that we've used over the millennia.   The more research that I've done, however, has caused me to permanently shelf this automata series.  We don't need more bad in this world...we need more good.  We don't need someone building torture automata.  We need people creating "happy" automata.
I've got another automata on my bench (The Inclined Slide) that is happy and healthy.
So...anyway...what's on your bench?
Cheers
-Jim Coffee-
one of the Automata Group Moderators
IMG_20191205_080728-1000.jpg
I create automata near San Diego, California


Random motion

 

I was browsing 507 Mechanical Movements last night and this one caught my eye.  It's a way of creating random linear motion.  I think very interesting...and a mechanism that I would like to use in an automata one day.
To those of you in the US...enjoy your Thanksgiving tomorrow.
Cheers
-Jim Coffee-
one of the Automata Group Moderators
I create automata near San Diego, California


Re: Favorite Suppliers

Mario Núñez
 

I ordered some gears from Cranky Crab for my current project and was impressed by the quality, fast delivery and even the personal note that was tucked into the package asking me to keep in touch and send a picture of the project that's going to use their gears. 

Mario

Re: Automata

Gus
 

Hi Stuart,

I don't yet have a clear picture of what you are trying to achieve. What stage is your automata, photos possible ? If not, sketches ? Is the upper arm fixed, the arm fully extended at the start, then raised to chest height by bending from the elbow ? 

Regards,
Gus

Re: Automata

V Bass
 

^----   What Gus said. There are several mechanisms that will give a motion that generally matches your description, but may not do exactly what you want. What exactly do you need it to do?

Re: Favorite Suppliers

 

Nice to hear about Cranky Crab.  I look forward to ordering from him one day.  He has some very interesting stuff.
-Jim-

On Sat, 23 Nov 2019 at 17:44, Mike <smc5910@...> wrote:
Since my CNC is down, I purchased three sets of gears from cranky crab workshop, it was a great experience, even the packing filled me with joy. 
--
Looking forward to hearing about your automata adventures!


Mike

Wooden Curiosities

Re: What's on my Bench: Bearings

 

Hi Mike...
Regarding costs: 
Regarding incorporation into the automata:  In the past I have:
  • Forced bearing assemblies over wood dowels.  While this does work, maintenance and removal are not easy.  The precision shafting is not expensive and is very precise.  
  • Used stainless shafting and ball bearing assemblies.  This works well.
In the future I will be copper plating at least some of the precision shafts.  The copper plating 'takes the the shafts back in time', it's a nice effect.  And the bearings still slide on and off easily.

Another type of bearing that I use are nylon spacers.  I source them from ServoCity.  When I have a shaft that does full rotation I use ball bearings.  But when I have a shaft that does partial rotation, and that has a relatively light load, I use nylon spacers.

All of us have our own building standards and objectives and goals.  In my case I like "quiet", "smooth", and "longevity".  I maintain an inventory of bearings and spacers that allows me to create without running out.  It's taken me time and money to build the inventory...but at the end of the day I really appreciate not having to slow down and wait for something to arrive in the mail.  And speaking of arriving in the mail...I should mention that I source virtually everything that I use online.  I get sick and tired of driving to somewhere only to find no stock, or out of stock.  
Cheers
-Jim Coffee-
San Diego, CA


On Sat, 23 Nov 2019 at 17:41, Mike <smc5910@...> wrote:
Jim, curious as to the cost. Do you incorporate the metal shafts in with the wood or do something entirely different?
--

Thanks!
Mike

Wooden Curiosities

Re: Favorite Suppliers

Mike
 

Since my CNC is down, I purchased three sets of gears from cranky crab workshop, it was a great experience, even the packing filled me with joy. 
--
Looking forward to hearing about your automata adventures!


Mike

Wooden Curiosities

Re: What's on my Bench: Bearings

Mike
 

Jim, curious as to the cost. Do you incorporate the metal shafts in with the wood or do something entirely different?
--

Thanks!
Mike

Wooden Curiosities

Re: What's On My Bench - The head of Augustus

Mike
 

It reminds me a bit of Superman's heat vision. :)  I am looking forward to seeing this incorporated into an automata.
--
Looking forward to hearing about your automata adventures!


Mike

Wooden Curiosities

Re: What's On My Bench - The head of Augustus

Mario Núñez
 

Very cool.

Mario

Re: Automata

Gus
 

Hi there,
More detail please, what is being moved, what sort of movement, rotation, linear, how far, how fast, uniform speed ?
Can you elaborate ?

Gus

Re: Automata

Paul E Giles Jr
 

Have you looked at a Scotch Yoke? They were once popular on washing machines and used for that back and forth motion. A quick internet search will get you a few .gifs plus some good pictures. All you will have to do is attach a lever to the yoke and you will have your motion.

Paul

On Sat, Nov 23, 2019 at 1:01 PM <strtoneill@...> wrote:
Hi all struggling a little bit with a movement I want to achieve. Clockwise then anticlockwise through 90 degrees. Any help?



--
Paul Giles

Automata

strtoneill@...
 

Hi all struggling a little bit with a movement I want to achieve. Clockwise then anticlockwise through 90 degrees. Any help?