New Featherweights
Moderators: BeligerAnt, petec, administrator
Speedo ?43.13 Sabretooth 10A Dual Motor Controller
Motor ?9.99 Motor from 12v Cordless Drill Driver
Motor ?9.99 Motor from 12v Cordless Drill Driver
Battery ?0.00 Battery from 12v Cordless Drill Driver
RX ?35.00 Ar6100 Spektrum 2.4Ghz
Total: ?98.11
If those motors are under or are 5 Amps each i will get four not two increasing the total by ?20
Motor ?9.99 Motor from 12v Cordless Drill Driver
Motor ?9.99 Motor from 12v Cordless Drill Driver
Battery ?0.00 Battery from 12v Cordless Drill Driver
RX ?35.00 Ar6100 Spektrum 2.4Ghz
Total: ?98.11
If those motors are under or are 5 Amps each i will get four not two increasing the total by ?20
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- Location: London
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Okay, thanks andy. Here is my revised list: slightly over budget, but i will work on it.Andrew_Hibberd wrote:I would be careful. When you reverse the drive motors you get a huge spike in current drawn. I have read a couple of times that the 10Amp controller can fail with one motor if over volted. If you use a 25Amp controller you should have less chance of breaking it.
Speedo ?95.00 Sabretooth 25A 2x Motor Driver Universal
Motor ?9.99 Motor from 12v Cordless Drill Driver
Motor ?9.99 Motor from 12v Cordless Drill Driver
Motor ?9.99 Motor from 12v Cordless Drill Driver
Motor ?9.99 Motor from 12v Cordless Drill Driver
Battery ?- Battery from 12v Cordless Drill Driver
RX ?35.00 Ar6100 Spektrum 2.4Ghz
Total: ?170
- BeligerAnt
- Posts: 1872
- Joined: Wed May 15, 2002 12:00 am
- Location: Brighton
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Speed calculation:
Wheel diameter = D = 15cm or 0.15m
pi = 3.14
RPM = 550 or 9.17 revolutions per second
1 revolution = pi x D = 3.14 x 0.15 = 0.47m
Distance travelled in 1 second (i.e. speed)
= 0.47m x 9.17 revs/second = 4.3 meters per second
or 4.3 x 60 x 60 / 1000 = 15.48 kph
Speed (kph) = pi x D x RPM x 0.06
Wheel diameter = D = 15cm or 0.15m
pi = 3.14
RPM = 550 or 9.17 revolutions per second
1 revolution = pi x D = 3.14 x 0.15 = 0.47m
Distance travelled in 1 second (i.e. speed)
= 0.47m x 9.17 revs/second = 4.3 meters per second
or 4.3 x 60 x 60 / 1000 = 15.48 kph
Speed (kph) = pi x D x RPM x 0.06
Gary, Team BeligerAnt
- terminaldamage
- Posts: 180
- Joined: Wed Jan 20, 2010 9:54 pm
- Location: Aberdeen, Scotland
- Contact:
That may seem a lot, but for a featherweight that's not a bad price for your speedo, motors, battery and RX (basically all the components you need to make it move) Be prepared to spend up to ?250 though by the time you've finished as that would take into account chassis/armour materials, wires/connectors, fixings (nuts, bolts, screws) and perhaps the most unexpected cost, tooling. Breaking a drill bit or two results in a trip to the diy store and up to ?10 for a replacement pair of bits. May not sound a lot but have that happen a few times and it starts to add up, especially if you've been saving hard for robot funds.Total: ?170
This isn't to try and put you off though, just a heads-up as to what to possibly expect with respect to FW costs.
Jamie McHarg
RogueTwo Robots
www.rogue-two-robots.vze.com
With great power, comes great reliability.
RogueTwo Robots
www.rogue-two-robots.vze.com
With great power, comes great reliability.
I know that it is not too much in comparison to other feathers, and it is not as if i do not have enough, but i am very paranoid about spending money, and i have been saving ages for something like this. Another good thing is that i will not have to spend too much money on body materials, as i have asked if i could put a club together in yr8 to build a combat robot, as we have something similar for micromouse, and it was turned down due to safety issues. But, i have been granted the use of school machinery (bandsaw will be useful) and materials (HDPE! Yay!) in compensation, so i can make some parts at school.terminaldamage wrote:That may seem a lot, but for a featherweight that's not a bad price for your speedo, motors, battery and RX (basically all the components you need to make it move) Be prepared to spend up to ?250 though by the time you've finished as that would take into account chassis/armour materials, wires/connectors, fixings (nuts, bolts, screws) and perhaps the most unexpected cost, tooling. Breaking a drill bit or two results in a trip to the diy store and up to ?10 for a replacement pair of bits. May not sound a lot but have that happen a few times and it starts to add up, especially if you've been saving hard for robot funds.Total: ?170
This isn't to try and put you off though, just a heads-up as to what to possibly expect with respect to FW costs.
My budget max was ?200, so i am not doing that bad.
One thing i would like to know, is do you guys think that those drill motors will stand up to being thrown around by flippers, as they are only ?10 for a drill and battery...