Forum: FIRST Tech Challenge
10-18-2016, 04:21 AM
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Replies: 2
Views: 259
Re: Screw Size for Tetrix Motor
I don't believe that there is a shaft encoder for the Tetrix Motor. You might be thinking of the Andymark Neverest motor( it's quite a bit larger) which has a hall effect encoder mounted to the back...
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Forum: FIRST Tech Challenge
10-06-2016, 01:32 AM
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Replies: 5
Views: 737
Re: [FTC]: Linear Slide Thoughts
If you go to the DATA tab on the JVN calculator you can add different types of motors to it by filling in the different columns in the Motor Specifications Table. The motor that you have filled in...
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Forum: General Forum
08-30-2016, 12:50 AM
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Replies: 22
Views: 1,845
Re: Using a 775pro in Dusty Conditions
If your looking to reduce weight a brushless inrunner will be more powerful for the same weight and will be sealed. The resources you need such as flashing brushless ESC's with SimonK is quite well...
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Forum: General Forum
08-27-2016, 08:23 PM
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Replies: 48
Views: 3,620
Re: Best Event Giveaways
A heat sink or fan mounted to the motor( BAG, 550,775) will help reduce heat build-up over the long term, but unless the heat-sink is made of a super-conductor, it won’t be able to draw the...
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Forum: Electrical
08-22-2016, 11:35 PM
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Replies: 12
Views: 885
Re: Optimal motor controllers?
If your using Talon SR’s are they are working well for you there isn’t necessarily a need to change (providing you have a decent stockpile that will last you a few more seasons).
The SPARK and the...
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Forum: Motors
08-21-2016, 07:26 PM
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Replies: 17
Views: 2,107
Re: Non-FIRST Motor Suggestions?
Yes it is the number of gear-teeth, the same applies for the number of teeth on sprockets or belts. You can also just type in the reduction that you want say 1:3 etc.
Some gearboxes have more than...
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Forum: Off-Season Events
08-17-2016, 03:02 AM
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Replies: 45
Views: 9,057
Re: China Robotics Challenge 2016
First of all FedEx can cover the cost of shipping a robot crate to one regional/in-season event via the Transport Exemption system( thanks FedEx it’s really helpful). This system works for...
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Forum: Motors
08-11-2016, 07:54 PM
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Replies: 17
Views: 2,107
Re: Non-FIRST Motor Suggestions?
I would seriously suggest using the JVN calc, it's really helpful and pretty easy to use. It will save you a lot of headaches, time and potentially a lot of money...
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Forum: Motors
08-11-2016, 07:49 PM
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Replies: 17
Views: 2,107
Re: Non-FIRST Motor Suggestions?
In regards to the gearboxes, you need to carefully consider your gearing. A Toughbox Micro( geared for 12.75:1) is going to mean that your robot is geared for about 14.6fps with 8inch wheels(without...
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Forum: Motors
08-07-2016, 09:26 PM
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Replies: 17
Views: 2,107
Re: Non-FIRST Motor Suggestions?
I wasn’t necessarily suggesting just getting the motor/gearbox assembly.
The entire wheelchair base, seems to fit your requirements well. You should be able to get the base of an old wheelchair much...
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Forum: Motors
08-06-2016, 11:25 PM
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Replies: 17
Views: 2,107
Re: Non-FIRST Motor Suggestions?
If your looking for a low-cost solution to those requirements I would recommend getting the base of an old electric wheelchair. Lots have two rear wheels independently driven and casters in front,...
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Forum: General Forum
07-24-2016, 06:50 PM
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Replies: 14
Views: 1,192
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Forum: Extra Discussion
07-22-2016, 07:12 AM
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Replies: 13
Views: 1,244
Re: pic: Experimental VP drive gearbox
The reason the VP load rating charts are very different is that the 775pro has a free speed of around 18730rpm and produces 0.71 N.m of torque at stall. The CIM on the over hand has a free speed of...
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Forum: Off-Season Events
07-13-2016, 09:36 PM
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Replies: 195
Views: 18,043
Re: IndyRAGE - All-Girls Comp+ - October 1
Team 234 is putting a lot of work into organising and running this event let's not take away from that.
The planned lunch discussions are not biased against males. They are simply discussing bias...
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Forum: General Forum
07-13-2016, 02:16 AM
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Replies: 82
Views: 5,946
Re: Chain vs. Belts?!?
A 4mm metric allen key is recommended( what it is designed for) which is handy for us being an Australian team and using a lot of metric( M5 and M6) hardware. In reality 5/32 inch is 3.97mm so there...
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Forum: General Forum
07-08-2016, 10:36 PM
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Replies: 82
Views: 5,946
Re: Chain vs. Belts?!?
This is a topic that is discussed quite often.
There is a good white paper written by team 234 which evaluates the power transmission methods:
https://www.chiefdelphi.com/media/papers/2216
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Forum: General Forum
07-04-2016, 02:20 AM
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Replies: 73
Views: 6,300
Re: Future FRC Technologies?
There isn't a lot stopping you from using LiFePO4 batteries on your robots for demos and practice time out of competition, it'd be good for demo's but there would probably be a performance difference...
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Forum: General Forum
07-04-2016, 01:53 AM
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Replies: 73
Views: 6,300
Re: Future FRC Technologies?
There are two main types(most commonly used) of LiFePO4 cells 18650’s and A123’s
Laptop Batteries, cordless tool batteries(lithium ones), Tesla car’s etc.
Use 18650 cells.18650...
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Forum: Electrical
07-02-2016, 09:27 AM
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Replies: 8
Views: 1,248
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Forum: Electrical
07-02-2016, 09:17 AM
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Replies: 8
Views: 1,248
Re: Battery increasing in capacity over time?
Global Warming?
Have you been keeping the batteries at a consistent temperature, like is the shop warmer than it was for the test the previous year etc.
Temperature greatly effects a SLA's...
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Forum: General Forum
07-01-2016, 08:18 PM
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Replies: 73
Views: 6,300
Re: Future FRC Technologies?
But here’s the thing, I really don’t see weight being much of an issue. Yes, they do have a shorter lifespan than lithium batteries, but they are also cheaper than Lithium batteries of comparable...
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Forum: General Forum
07-01-2016, 08:06 PM
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Replies: 73
Views: 6,300
Re: Future FRC Technologies?
Brushless motors
Having a few small, low power brushless motors and a certain brushless motor controller being legal could allow students to learn about different types of motors. They are also...
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Forum: General Forum
07-01-2016, 04:57 AM
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Replies: 15
Views: 1,132
Re: Power for an outdoor project
So if your power usage is 6a/h per day ( at 12V) and you are wanting minimum battery changes/maintenance surely larger batteries would be better.
Is there anything which makes large lead-acid...
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Forum: General Forum
06-29-2016, 07:46 AM
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Replies: 34
Views: 5,790
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Forum: General Forum
06-22-2016, 11:30 PM
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Replies: 20
Views: 3,018
Re: Robotic Couch made from FRC parts
But can it go sideways?
A sofa with mecanum wheels capable of moving in all directions was built by some Australian University Students including several FIRST Alumni( from team 3132) with...
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If Dave stops wearing the Hawaiian shirts, the terrorists have won. - kjohnson [more] 
