bill of materials based off a batch of 1000 units Part Number
Description
Supplier
Supplier number/ SKU
Custom order?
Materials
Cost per kg
Cosr per unit
Processing
Cost per unit
Assembly
Tooling
Total unit fixed cost
Total cost per unit
N/A
Y
5000 grade aluminium
£1.62
£0.26
Casting
£2.04 (inc. shop rate)
N/A
£815
£0.82
£3.12 (converted from USD)
CH340G
1
Base Plate
alucast.co.uk estimated by solidworks
2
ESP32 Open Source Developer Board
JRT Electronic Technology through Alibaba.com
esp8266
Custom Headers
N/A
N/A
£1.63
N/A
N/A
Flashing code 3min @ £10ph = £0.50
N/A
N/A
£2.13
3
M2x6mm Machine Screw
westfieldfasteners.co.uk/
WF2329
N
N/A
N/A
£0.034
N/A
N/A
Inserting screws 9 * 20s @ £10ph = £0.30
N/A
N/A
£0.61
4
Rotary Encoder
Shenzhen Gui Yi Technology through Alibaba.com
55448
N
N/A
N/A
£0.28
N/A
N/A
N/A
N/A
N/A
£0.28
5
alucast.co.uk Rotary Encoder Knob estimated by solidworks
N/A
N
5000 grade aluminium
£1.62
£0.06
Casting
£0.40
Interference fit to rotary encoder 20s @ £10ph = £0.03
£150
£0.20
£0.69
6
45mm Fader
Foshan Apai Electronics Co through Alibaba.com
SC4580GH
Custom Headers
N/A
N/A
£0.29
N/A
N/A
N/A
N/A
N/A
£0.29
7
Top Plate
quote provided by hendfab.com
N/A
Y
3mm 5000 aluminium plate
£1.62
£0.11
CNC Punching, Folding, tapping
£0.53
Fitting to base plate 20s @ £10ph = £0.03
£100 setup
£0.10
£0.78
8
Fader Top
Shenzhen Goldensun Electronics through alibaba. com
HW-221
Custom Colour
N/A
N/A
£0.06
N/A
N/A
Fitting to fader 20s @ £10ph = 0.03
N/A
N/A
£0.09
9
M2x16mm Machine screw
N/A
N/A
Inserting screws and bolts 8 * 20s @ £10ph = £0.27
N/A
N/A
£0.43
N/A
N/A
Testing 1 min @ £10ph = £0.17
N/A
N/A
£0.33
Batch mixing and casting 1hr @ £15ph per 5 blocks (skilled technician)
4 x 5 x £7 (inc tech cost FDM mounds) Lasts 50 casts =£140
£0.14
£1.25
Connections 20s * 16 @ £10ph = £0.53
N/A
N/A
£0.74
11
M2 nut
10
Neopixel LED ring
12a
12b
Wax Diffuser
12c 13
WF17971 westfieldfasteners.co.uk/
£0.042 N
N/A
N/A
WF1253
£0.012
Shenzhen Ruize Technologythrough alibaba.com
12 X WS2812
Custom headers
N/A
N/A
£0.30
Paraffin wax
cosyowl.com
KeraWax 4600
N/A
Paraffin Wax
£1.50
£0.54
Gelatine wax
Guangdong Minxintang Biological through alibaba. com
Foamboard
Assorted Local Buisnesses
Header connector wires
Quzhou Holly Electronic through Alibaba.com
N/A
N/A
MX-0034
N/A
Gelatine Wax
£2.28
£0.47
N/A
N/A
Powdered Foamboard
0
0
Macerating
Operator cost £0.10
HLJK-2019006
N
N/A
N/A
£0.013
N/A
N/A
Total cost per unit: £10.74
aotrom
page 4
charlie cumming . pde3 . 2020
