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81
Mechanics and Construction / Re: Anybody make their own wheels?
« Last post by Avadon77 on November 08, 2016, 11:23:09 PM »
Hmmm, never messed with that OS. I'm still using raspbian. My main problem is with wheels is that the only 14" diameter I can find are either way too heavy, or too narrow to keep from sinking because of weight. This sucker is going to have some mass to it. Aslo, I'm not willing to spend over a  hundred bucks on cheap plastic. lol

When it comes to making wheels I've never decided to do it because there's only a few billion wheels on the market for robots and industrial machines. The only time I've ever seen where people make "wheels" is where they make their own hub/sprocket combinations for tracked vehicles and even a lot of that can be done with off the shelf chain sprockets. So I really don't see the reason to make wheels.

look at all these wheels!
https://therobotsource.com/73-shop-for-wheels-tracks-omni-wheels-mecanum-wheels-for-building-robots#/

How fast is this robot going? Are we trying to do 35 mph or 3.5 mph?

You can get really large contact wheels 12" and higher from many suppliers if you're talking about precision, Aluminum billet wheels with duro70-80 rubber on them (think car tire hardness rubber). They're not cheap but they'll last forever

http://www.beaumontmetalworks.com/shop/category.aspx?catid=6

I got some of my wheels from my friends at Beaumont who I also get my sanding machinery equipment from.

I'm sure if you search you can find a 14" contact wheel.

Now if you're talking more of a pneumatic/offroad wheel than tractor supply as mentioned, Big R, MSC/Grainger has tons of wheels too.
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This is a huge broad question. If you're trying to build a wheeled robot I suggest you start with a robotics chasis. Do not try to use an RC Car or Truck because they are very difficult to adapt for most people. You'll probably want a motor or servo on each wheel.

There are tons of wheels here

https://therobotsource.com/73-shop-for-wheels-tracks-omni-wheels-mecanum-wheels-for-building-robots#/
83
Mechanics and Construction / Re: Tracked Vehicle Control Arm angle?
« Last post by Avadon77 on November 08, 2016, 11:09:41 PM »
These road wheel arms on these two robots (Green is FIRST robotics team robot and the other is a Darpa Suspension robot) have a much higher angle.

So I'm wondering should the arms be much lower like 15dgs on the Abrams and other military tanks or should I be much higher like many other robotics chasis? and what is the difference?

Thanks,
84
Mechanics and Construction / Tracked Vehicle Control Arm angle?
« Last post by Avadon77 on November 08, 2016, 11:01:41 PM »
I'm building a tracked robot and trying to figure out what angle the axle arms/control arms should be set at? I measured the M1 Abrams tank and the road wheels are all set to 15dgs except for the leading wheel which is set at 40dgs.

But then I looked at other robotic tracked vehicles and they look to be around 40-60dgs. Is there some special angle? Of course this dictates how the suspension will work as well.

any clue what angle these axle supports should be placed at?

85
Mechanics and Construction / Re: Robot wheel/omni Directional Wheel
« Last post by Avadon77 on November 08, 2016, 10:07:35 PM »
what are the dimensions of those wheels?

I've never used Omni's and I'm hoping I can get the following answered as well as your questions.

*What are the trade-off's with larger vs smaller rollers on the omni wheels. I see some that have a ton of tiny small wheels and others which only have 3-4 rollers. What is the pro vs con with this?
86
Misc / Re: Evolution of the War-Machine
« Last post by Murdoch on November 08, 2016, 03:20:22 PM »
Once I build it. I thought of going to the Toronto comic on,  show it at the TorontoPropExpo. But I also thought of my old neighborhood, which in fact is the 2nd largest subsidized housing unit in Canada as I understand it. The school I had attended there I think would benefit a lot of kids by way of education and hardwork. We also have a hospital for sick kids, where my daughter will have surgery in a little over a week from now. A lot of prop-cosplay folks do that...GM
87
Misc / Re: Evolution of the War-Machine
« Last post by gtabasso on November 08, 2016, 11:58:48 AM »
That is amazing. What will you do with the armor after you build it? Have you thought of working with kids or sharing your work with them to inspire them? That would get every high-school kid I know excited!
88
Robot Videos / Re: Cataglyphis: The Autonomous Rover that won NASA Centennial Challenge
« Last post by gy60356 on November 08, 2016, 08:47:56 AM »
This is two years earlier, when we first built the robot:
89
Mechanics and Construction / Appropriate Components???
« Last post by Kate91 on November 07, 2016, 10:41:22 PM »
I am designing a prototype product and would like to use a series of components from Little Bird Electronics in the production. (https://littlebirdelectronics.com.au)
I would need it to, once a button it tapped, initiate wheels to roll until the light sensor sensors light. Then I would need a programmer connected to the light sensor and wheels to stop the wheel movement & start a robotic motor to raise 2.5 - 4kgs, to an 80° angle.
For the same action to happen in the opposite series of events (lower the object and roll back until light sensor, on opposite side of original, can no longer sense light) would I need a different set of programming (i.e. different motors and programmers)?
I use thinking of using the “Tiny AVR Programmer” in congjunction with an "Analog Ambient Light Sensor TEMT6000" as well as the "12V Low Low noise DC Motor” is this the right set of components to be using?

Tiny AVR Programmer
https://littlebirdelectronics.com.au/collections/programmers/products/tiny-avr-programmer

Analog Ambient Light Sensor TEMT6000
https://littlebirdelectronics.com.au/products/analog-ambient-light-sensor-temt6000

12V Low Low noise DC Motor 146RPM w/Encoder https://littlebirdelectronics.com.au/collections/robotics/products/12v-low-noise-dc-motor-146rpm-w-encoder
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Misc / Introduction of Tersus GNSS
« Last post by Tersus GNSS on November 07, 2016, 10:07:14 PM »
Hi there,
I am a GPS RTK engineer from Tersus GNSS. Tersus GNSS is a start-up company from Switzerland who make least expensive, reliable, centimeter-level positioning accuracy GPS RTK boards for Robotics, UAVs and Engineering, etc. Our RTK boards can be integrated to other host devices or served as an independent GNSS receiver at a very affordable price.

In the past, GNSS or GPS RTK solutions were dominated by giant companies and they were extremely expensive. Tersus GNSS was found in 2014 and has a team of skillful GNSS RTK engineers and professionals. Our passion is to provide affordable, reliable and real-time centimeter-level positioning accuracy RTK solutions for drones and related users. For example, the Precis-BX316, the Multi-GNSS, Dual Frequency RTK Board with Dual Antenna for Heading Check it out.

In the meantime, we offer bundle kit with related antennas, cables which aim to make your application easy and convenient. If you are interested and want to know details of technical specifications, drop us a line to [email protected] for all Datasheets.
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