4. BILL OF MATERIAL
- bicycle wheel
- stretch fabric (2000mm x 150mm)
- Antiskid rubber (kitchen) (300mm x 450mm)
- 8 Nuts M6
- 2 Metal bars (2 000mm, Ø 6mm)
- Cotton cord
- 10 Tie-wraps
- 2 Wooden curtain rod ball end s
- MDF board (6 mm thickness 500mm x
500mm)
- Double-sided tape
CHAIR BRAKE 1.5
13
20
21
Total material cost: 40 euro
5. 1 DESCRIPTION Download the part file
from our blog and send it to the laser cutting
machine. Insert the MDF board in the machine
and start the cutting process. This cutting
process results in four parts: calibers A and B and
the two holders.
CHAIR BRAKE 1.5
Part file … (on our blog)
20 minutes
Laser cutting machine
None
Tailored parts: 2 calibers, 2 holders
15 euro
6. 2 DESCRIPTION Mount the spade drill
bit (24mm) into the pillar drill machine. Clamp
the wooden holder so that the point of the bit is
at the end of the path (as indicated on the
technical drawing). Drill a whole until the circular
groove is 3mm deep.
CHAIR BRAKE 1.5
Technical drawing “houder”
10 minutes
Pillar drill machine, spade drill bit, clamp
None
None
No action cost
7. 3 DESCRIPTION Use tie-wraps to
mount the two holders on the left and right
armchair at a distance of 150mm from the
beginning. Make sure that the opening is
pointed to the back of the chair.
CHAIR BRAKE 1.5
No
4 minutes
Ruler
6 Tyraps
None
No action cost
8. DESCRIPTION Search a bicycle wheel
with an diameter that is 50mm larger than the
wheelbase diameter of the desk chair.
Remove the spokes with a grinding disk, then cut
out a part of the contour of the wheel so the
desk chair can roll in and out.
CHAIR BRAKE 1.5
No
10 minutes
Pencil, grinding disk
Bicycle wheel
None
No action cost
4
9. 5 DESCRIPTION Enlarge the first and
seventh spoke hole on both sides of the cutted
bicycle wheel with an M6 drill. The straight
distance between the first and seventh hole
should be around 300 mm.
CHAIR BRAKE 1.5
No
5 minutes
Drilling machine, ruler
None
None
No action cost
10. 6 DESCRIPTION Cut two metal bars to
a length of 485 mm, and two bars to a length of
755mm.
CHAIR BRAKE 1.5
No
10 minutes
Grinding disk
2 metal bars
None
No action cost
11. 7 DESCRIPTION Bend the metal bars as
indicated in the technical drawing. Make use of
caliber A in order to obtain the correct angles.
CHAIR BRAKE 1.5
Technical drawing “front and back bars”
10 minutes
Bending machine
None
None
No action cost
12. 8 DESCRIPTION Tap a screw thread
(M6 pitch 1mm) in the short end of the four
bars. The thread must have a length of minimum
25 mm. Check the thread with the nut.
CHAIR BRAKE 1.5
Technical drawing “front and back bars”
25 minutes
Die cutting tool
None
None
No action cost
13. 9 DESCRIPTION Put a short and large
bar in the enlarged holes at one side of the
bicycle wheel. Make grooves with a grinding disk
where the two bars should be mounted
together. Connect the two bars with tie-wraps.
CHAIR BRAKE 1.5
Technical drawing “front and back bars”
5 minutes
Grinding disk
4 tyraps
None
No action cost
14. 10 DESCRIPTION Drill a hole (M6, depth
15mm) in the center of the wooden curtain ball.
CHAIR BRAKE 1.0
No
5 minutes
Saw, drilling machine
2 Wooden curtain rod ball end s
None
No action cost.
15. 11 DESCRIPTION Mount the two curtain
balls on top of the metal bars using hotmelt.
CHAIR BRAKE 1.5
No
5 minutes
None
None
None
No action cost
16. 12 DESCRIPTION Draw the pattern so
that it can fit around the bycicle wheel. Cut the
fabric, fold the fabric and sew the two sides
together to obtain a long fabric tube. Turn the
tube inside out so that the seam is on the inside.
CHAIR BRAKE 1.5
No
20 minutes
Sewing machine
Yarn
No action cost
Tailored part: fabric tube
17. 13 DESCRIPTION Stretch the fabric tube
an pull it over the profile of the bicycle wheel to
get a better finish. Make four holes in the fabric
where the metal tubes come through.
CHAIR BRAKE 1.5
No
5 minutes
No action cost
None
None
None
18. 14 DESCRIPTION Cut out fourteen
rubber patches, by making use of caliber B. Fold
the rubber patch so that the ends match and
punch five holes (1,5mm) through this patches.
CHAIR BRAKE 1.5
No
40 minutes
Caliber B, scissors
Rubber
Tailored parts: 14 rubber patches
No action cost
19. 15 DESCRIPTION Sew the rubber
patches around the ring. Attach the ends with
double sided tape.
CHAIR BRAKE 1.5
No
120 minutes
Needle
Cotton cord
None
No action cost
20. 16 DESCRIPTION Mount the metal bars
with the ring (in the pre-drilled holes) with the
nuts.
CHAIR BRAKE 1.5
No
5 min
Spanner
The 4 nuts
None
No action cost
