Parts

nate200789 · Post by **nate200789** » Wed Jul 02, 2008 5:29 pm

Hi, I'm having some trouble finding a few items

#1. A good lightweight reciever battery pack of any type and the correct charger.

#2. A lightweight cheap speed controller.

#3. A place that sells sheets of 1mm. thick polycarbonate

Thanks!
Nathan Finger

razerdave · Post by **razerdave** » Wed Jul 02, 2008 8:25 pm

Technobots (http://www.technobots.co.uk) do sheets of polycarb 1mm thick
thats where I get all mine from

Simon Windisch · Post by **Simon Windisch** » Wed Jul 02, 2008 10:52 pm

I could bring some 30cm square sheets on 1mm polycarbonate (Makrolon) to the next Reading Robot Club if you can make it? I'm sure I can beat any other price, I still have 2.5 sheets of 3 1x2m sheets that I bought a couple of years ago.

As for receiver batteries, do you mean 4.8v NiCd, or something different?

For LiPos, I buy from here (but they're out of stock at the moment. The best chargers I have found is the Pro Peak series. You'll need a 12V supply, but they'll charge anything you'll ever need to charge, and they can do discharge-charge cycles as well.

Good cheap speed controllers are tricky to get, I'll admit. The Scorpion Mini was the best, in my opinion, but it's been discontinued. Some of us use of servo boards. That's probably your cheapest option.

Simon

Flippt · Post by **Flippt** » Wed Jul 02, 2008 11:31 pm

If you mean a speed controller for drive, all I know that is still manufactured are the sabertooth 2x5A
http://www.dimensionengineering.com/Sabertooth2X5RC.htm
Its alot bigger and heavier, but it does a great job, or so I've heard anyway. Similar to the bigger Speed controllers as the 10 Amp version or the 25A, you can do some customization on how it will perform.

leo-rcc · Post by **leo-rcc** » Thu Jul 03, 2008 7:07 am

Or this one:

http://www.robotpower.com/products/scorpion_info.html

Pretty much the same specs as the Sabretooth.

The new Scorpion mini's are still not available yet, which is a shame because the previous version was very good.

nate200789 · Post by **nate200789** » Thu Jul 03, 2008 7:34 am

Simon, that would be great! Whenever I go to technobots I can never find 1 mm. polycarbonate. The thinest they have is 2. By the way I decided that I'm going to start off with 360 degrees modified servos than if its not fast enough I'll look into speed controllers.

Flippt · Post by **Flippt** » Thu Jul 03, 2008 11:35 am

You can speed hack the servos if they aren't as fast as you'd like. But keep in mind, some servos cant be speed hacked. The speed controller has nothing to do if you want it to go faster.

If you are gonna have speed controllers, dont use servos, use some geared motors instead, that will save weight and alot of space.

nate200789 · Post by **nate200789** » Sun Jul 06, 2008 6:05 pm

will this http://www.robotmarketplace.com/product ... X5-RC.html speed controller work with these http://www.robotmarketplace.com/products/IL-SAN50.html motors? And will they be powerful enough a for a two wheeled antweight running on a 7.2V lipo battery pack?

EpicentrE · Post by **EpicentrE** » Sun Jul 06, 2008 6:27 pm

The simple answers: Yes, and yes.

There are a lot of different speeds of those gearmotors available on Robot Marketplace (aswell as Solarbotics, Technobots and Precision Microdrives), so the best thing to do is to decide what size wheels you want, then work out what speed motor you will need to end up at a good speed (which I find is between 0.75 and 1 metres per second, but it's personal preference).

If you do that, you should end up with a very strong drive system; indeed, those are the motors that the majority of antweights use nowadays.

nate200789 · Post by **nate200789** » Wed Jul 09, 2008 4:32 pm

Does anybody have anything bad to say about this transmitter? It's so cheap I thought there must be a catch.
http://www.bidproduct.com/part/Product_ ... TAL_9.html