I spoke with Volker and we talked about what so everything should be present in at least one porter.
We found primarily, a chair would not be bad.
I still have a really old simple wooden chair and slammed against a build like that.
Then Volker came with the swivel chair and said he would like something very model of justice, but he could not build such a thing could even say he at the moment.
My statement was, of course, you could build something like this and I see no problem with.
Added to this was the fact that I developed for myself, interested in such a swivel chair with me.
I asked why Volker, once to collect images and draw the chair in simple views.
A short time later I had pictures and drawings, and from the PDF I generated the milling files for an exercise chair.
As usual, came with me once brass used, since this material can be worked particularly well.
Getting parts for a swivel chair.
This was the first part that I created and was able to present Volker.
Since it is an exercise chair, we realized that the needs of the backrest must be even better.
Therefore Volkers concentrated thoughts and my actions even once on the back.
Development and formation of the backrest.
Below left, the first exercise of the backrest, while the upholstery studs were introduced as drillings.
But still lacked the transferred seat cover, I milled a framework to simulate this better.
Only here the decorative upholstery nails looked not even look convincing.
Then Volker suggested to use a male that was better because now the nails had to be so only in a negative light.
The result was the male top left and top right of the imprint.
The imprint of the male I made with 2 mm gray board.
These both have simply clamped in a vise with smooth jaws and compresses the gray board to about 1 mm.
Then I cut out the back to the male around with a sharp knife.
The backrest I could now turn in this form and then soaked in glue and strengthened by it.
After drying, the chipboard could be ground into shape.
First compilation of the now successful swivel chair parts.
The seat was cut from a 2-mm polystyrene plate in the form.
So the parts for the swivel chair and looked out afterwards been added was also a seat cushion of a mm to the right 2 cut polystyrene piece was created.
But there were still missing more parts that could now be made.
Seat, spring retainer, rotating bearing disk, and the back spring roller holder with the slots are too wide.
Here, watch again the seat cushion, also spring retainer, pivot wheel, reel seat and back spring.
Then, the seat and the backrest have been connected for the first time sample of the back spring.
In the production of properly functioning bolt and wing nut I'm still separately.
Unfortunately, it turned out that the slots were too wide in the back spring and still no adequate clamping was achieved with the bolt and wing nut.
Links jig for mounting the roller into the chair legs.
The 3 holes on the top edge serve to hold the deburring of the role holder.
Law, the bending theory of the role holder.
Now I dealt with the roles, after all, can rotate and roll really should.
The role holder I had already shown in the bend.
To bend I had created me a bending tool.
In the spring tempered stainless steel but no sharp-edged bending is possible without it breaking.
The role holder are pre-formed with the bending theory.
First wheels milled sample this course, must be deburred.
M 0.6 wingnuts
To create the wing nuts I once introduced a 0.5 mm hole in a 2 mm brass plate.
Then I milled with a 90 ° prick a 3 mm circle around the hole 1 mm deep.
This was later the lower slope of the wing nut.
Now I have the plate upside down to edit it from the other side.
First, a short train was placed 1 mm deep with a 1-mm cutters exactly centered over the 0.5 mm hole.
Finally, I had to mill out only the contour of the wing nut.
What is still missing were the classic round wing and the M 0.6 thread.
In addition I have taken an M and started to cut the 0.6 thread taps.
I simply keep the wing nut between your fingers and then quickly comes the moment where threading is slightly heavier.
From this moment I use to free-hand, with a very fine diamond cutting wheel, the wing to drag around.
Now turn the tap back gently rid of all the fine chips, and then finish by cutting the thread.