How to build Dynamite
(Mk III)
I was asked to provide a price list for Dynamite. As I had
just rebuilt it from scratch I thought I'd describe the process,
with prices.
1. I designed the layout on some paper (photograph later)
2. I cut out the design on 1mm polycarbonate. A 623 x 510mm
sheet costs around £8 from Technobots
3. I used 4mm polycarbonate, also from Technobots for £16.50
plus postage for a 623 x 510mm sheet. I cut this polycarbonate
into 14mm strips with a circular saw, to get a high degreee
of accuracy, and used these as my side plates. I drilled 1.5mm
holes into the polycarbonate and tapped them to accept 12mm
M2 bolts.
4. I then attached the motors to the body. These are Sanyo
GM11s from Solarbotics
and cost $23 or around £13.50 each plus postage although
my previous version of Dynamite used Solarbotics GM10 motors
which are available for £10 from Technobots.
5. The Sanyo GM11s have a 2.5mm shaft with a straight edge
cut out of it. The fixing holes are 1.7mm thread whuch I tapped
out to M2 tread and then used a Dremmel to cut the inside
edges of the bolts off so they would accomodate the wheels
close to the motor base plate.
6. I machined some aluminium rod with an external diameter
of 5mm to fit my lego "Wheel 30.4 x 14" and an internal
diameter of 3mm to fit the shaft, and fitted an M2 screw through
the wheel and aluminium tube to make a firm fit.. I won't
include the price of the lathe, or the aluminium rod! The
lego wheels and tyres (Available on Bricklink
as "Wheel 30.4 x 14 (Tread Small Hub)" and "Tire
30.4 x 14 Offset Tread" for around 10p per set plus postage)
7. Then I fitted the:
- Battery -(Lithium Polymers, available from Overlander
for £10 plus postage as "145 Kokam Li-poly 7.4v"
- Reveiver - a Futaba R114F with the casing removed, available
from Sussex
Model Centre for £27 plus postage
- Speed Controller - a Sozbots model that is no longer made,
but its nearest equivalent is the "Dual 5Amp Speed
Controller - Carbide SOZDSCR2.3-X with leads" available
from Robot Combat
for $57 or around £33 plus postage.
- Wiring, price not included.
8. Finally I fitted the lid, also made from 1mm polycarbonate
Anyone with an interest in prices would also have to look
into the price of a
- Lithium Polymer charger and 12v supply
- Pair of 40Mhz crystals
- Transmitter
- Various tools
- Bolts and nuts.
But I hope this gives you an idea.
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