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by:QY Precision      2019-09-16
The bench circled again.
Imagine a public seat and make interesting connections between strangers.
In April 2015, it was commissioned to attend the Market Street Prototype Festival in San Francisco, California.
George Zisiadis came up with the original concept and I designed and made it.
We installed the unit together, and we were happy to watch as the public enjoyed the spin on the bench. The Bench-Go-
The circle was created from the following project: the tools used came from the basic idea, a rotating bench, and I developed two initial directions.
George talked to people and got a lot of good feedback to help us decide a design --
Fortunately, the one we all like best.
I drew this idea in detail in a CAD program (
Although most 3d drawing tools can be used, I used the moment of inspiration).
Next, I slice the model to get a cross section that can be cut with a CNC machine.
I tested the idea with a model prototype of 1/12, which consists of half the bench and cuts the cardboard with a laser cutting machine.
I took it in two directions and took them together to get a quick look at how the whole thing looks.
Both George and I were happy with that, so we went on to discuss the next big question of how to make it spin.
We brainstorm and come up with a lot of ideas, such as finding a playground to play junk games. go-
Use many large ball bearings or separate the car axle.
The solution we finally decided on was the bottom of a cheap used office chair.
We added support legs on the wheels under the end of the bench because we expected the bench and seating to be heavier than the chair design.
However, this is a prototype, and we are more interested in getting feedback from people about whether they like the concept or not, rather than the manufacturing process of manufacturing production levels --
If there is one, it will be later.
This is a video of George and I deciding yes, the idea is interesting, yes, the chair will work: The bench is supported by the backbone of 2 \"steel pipes, and the steel pipe runs vertically through the bottom of the bench.
In the middle of this tube, I welded a steel plate of 3/16 to match the steel plate on the top of the chair base.
During assembly, the plates will be bolted together.
Since the chair can be reclined or lifted, I welded the base to prevent these activities.
To prevent it from tilting, I welded the hinge base to the plate on both sides.
To stop it from lowering (
Need is all high)
, I cut a steel pipe vertically, put the vertical chair tube in the middle and weld the parts togethersee pics.
I use a support leg made of 1 \"steel pipe and more 3/16\" steel plate.
One end of the leg has wheels connected by a welded plate similar to the main base.
At the top, I designed a clamping structure to fit closely around the central square tube trunk.
This clip has two holes close to the end so that it is tightly attached around the trunk during assembly.
There are five legs at the bottom of the chair, press on it-
Suitable plastic casters are inserted.
I took these off and found that the center tube of the chair is now half an inch longer than the leg and the chair will not stand firmly.
In addition, the media
As the leg end, the mounting hole is not suitable.
I solved the problem by designing a five-angle plywood base with a center hole to install the center tube and designing the properly spaced hole for the end of the leg.
I welded the bolt to the press.
Install the hole and screw the nut through the bottom of the plywood Pentagon to connect it together.
Both ends are fixed in place by a threaded rod.
The Central Bar is 6 feet, and when everything is in place, they stretch out about a quarter of an hour.
In order to provide tension, there are some small circles outside of this where the screw bar goes through all the way and there is room to place the nut.
So the screw bar needs to be about 6 feet 3 inch and the length is 6 feet, so I simply cut it in the middle, weld the 3 inch pin and take out the end of the thread where I need it.
There\'s a small station here.
Sports video of my welding legs.
I designed the seat for the best combination of strength and brightness.
I cut the model horizontally into a section of 3/4 \"and determined that two of each three sections are spacers and one is the actual bench cross sectionsection.
In this way, the seat is not solid wood (very heavy)
, But the pieces are close enough to sit on it without any trouble.
The result is visually pleasing, Airy
It looks very easy to support the structure of the weight of the seat.
The cross section of the seat part is L-shaped and there is a square hole at the meeting of the branch (
The outermost shape of both ends has handrails).
The gasket is triangular and has a square hole.
For both types, the square holes begin with alignment with the bottom and rotate gradually until they reach 45 degrees in the center part.
When these parts slide into the square center bar in order, the gradual rotation shape of the bench appears.
Keep the workpiece not rotating through the square shape of the center bar and hole.
They are maintained vertically by the axial pressure of the central threaded rod passing through the square tube.
The rod is kept in place by two small pieces of circular plywood that cover the end of the rod after the last piece of bench.
The threaded rod passes through a small center hole and screws a nut at the end to stretch the entire assembly.
I cut the parts on the Komo Innova CNC router, as well as the round end and the five-angle plywood base.
Also, I cut the pieces of two rectangles that can be seen in some pictures.
This is to lengthen the wheel leg piece to the same thickness as the five-angle base, because I have measured the length of the leg before realizing that I need the base. Prototyping!
However, before doing most of the cutting, I have made a Test triangle with a square hole to verify that it will slide correctly onto the square center bar.
The cut size cannot be exactly the same as the size of the bar, otherwise it is too tight to slide.
A small offset is required.
I used this hole. 0015 inches (15 thousandths)
This works so well that these pieces slide into the bar without great difficulty, but still tight enough to not allow more than the minimum amount of rotation.
After forming on the CNC router, I ran all L-shaped through the edge fillet router.
The straight router leaves a very sharp edge and I don\'t want anyone to sit on it!
The rounded edges are safer, the edges look very beautiful and finished.
There is a special problem with the center of the bench.
This is where I weld on the bottom plate, the bolts on the bottom plate are attached to the base of the chair.
Due to the connection of a welded plate on the center bar, the part cannot completely wrap the wrap bar, thus sliding all the way.
For 6 or 7 most center parts, I had to cut off a part of it along the lower edge of the square hole.
But now, when they don\'t completely surround the bar anymore, they can simply be lifted from the bar.
I fix this by making two smaller alignment holes and inserting two half holes
Inch steel pins pass through all the central pieces and 3 pieces to secure them in the appropriate position.
The bench is assembled from the center.
First, I tied the central lever to the base of the chair.
Then I put the chips.
The central piece is placed on the bar on the chair attachment board (
As described in the previous step, these parts have a cut
Parts that allow this)
: Gasket, seat, gasket;
Gasket, seat, gasket, etc.
Due to the changes in the welds on each side, I need to do a little archiving of one or two of the central pieces so that they can be installed correctly in the correct position.
The next 3 or 4 pieces, the extra half
Inch hole, slide one.
Then I inserted half.
Inch pins go through all the parts and align them to prevent them from popping up (
Or got pried).
I then proceeded to slide the parts in order to one side, the gasket, the bench seat, the gasket until I was about 1 feet from the end and finally the bench seat parts.
At that time, I slid the clip of a wheel leg up, pressed it to the center, tightened the bolt and fixed it in the proper position.
The clip is as wide as the two spacers, so the next one is a bench seat again.
At the end, there is a gasket, then the last piece, bench seat with armrests.
At this point, the parts can be kept easily on their own, but the handrails parts will be removed if I am not careful.
Finally, after doing both sides, I put an end cap and bolt on one end of the screw bar, through the center bar, end-
Cover and bolts at the other end.
Our designated location on festival Market Street is on the south side between 1st and 2nd streets, and there are several other festival entries.
We decided that we should include a large enough base for a stable and better rotation experience to allow the wheel legs to roll.
I made this pie.
A circle of about 7 feet in diameter, made of 8 wedge-shaped parts.
I cut this on a CNC router like everyone else and bought a bunch of small metal plates and wood screws to hold them together.
In order to fix the circle together while fastening it with screws, I used the ratchet band and carefully ran around the edge of the circle and tightened it.
Installed at night so I brought the headlights but the street light was enough.
It took us about an hour to screw the round base and bench assembly onto the round base, and then we tried it on site and the wheels began to squeak (
This is something they have never done before).
Lithium grease solved the problem but I had to come and apply early in the morning as I didn\'t bring any lithium grease the night before.
Luckily, this means I can get the morning visitors to discover the festival and interact with the benches and other entries nearby!
In these three days, thousands of people of different ages are using it.
Once they sat down, they couldn\'t help laughing and had a good time.
It\'s not hard to figure out how to handle the bench --Go-Round.
We do feel that some people don\'t want to sit down because it\'s probably Art?
We have all been trained without contact.
We ended up writing \"there is a seat\" in the big letter from the base \".
But after a while, a group of people were waiting for their turn.
People and their children, their shopping bags, and their dogs sit and spin together.
Some people even try to lie on the bench and it works a bit if you\'re not too big!
We want the bench. Go-
The circle can inspire people to look at the city landscape in different ways.
Think of the world as a place to play
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