pic: (RP) Team 1708 Idea #1

[1708xMr.Roboto]

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[yoshibrock]

Very neat design, and quite visually pleasing. I take it you're not trying to make it over the hump? And what was your premise for choosing slick wheels over any other options? Just curious.

[1708xMr.Roboto]

I failed to mention a few things in the drawing, The wheels were supposed to be the Traction wheels, when I drew this on my computer at school I didn't have all the drawings handy when I was making this. I was really antcy to post it. So I'll make a list of all the revisions to this drawing.

1. Andy Mark Shift-able Transmissions
2. Any Mark Traction Wheels
3. 2 Motors with the tough boxes

Sorry for the inconvenience, I'll take this one down tomorrow and re-post the one with all the real stuff.

Happy Commenting, -Eddie

[Travis Hoffman]

Can you tell me more about the suspension springs/shocks?

[1708xMr.Roboto]

We actually came up from a diesel truck motor, a dodge to be exact. They are Valve springs, they are about 3'' long and have about 1 1/2'' of give to them. They are good to support about 145pds.

[yoshibrock]

They don't have enough give to let the frame slam into the ground, right? Because if so you might be dealing with damage to yourself/the field. Unless I'm interpreting the image wrong....which is entirely possible.

[waterfreak#1]

i realize the potential of springs but the hight of your bot seems like its going under the tunnel then why do you neeed the springs?

[1708xMr.Roboto]

Originally Posted by waterfreak#1

i realize the potential of springs but the hight of your bot seems like its going under the tunnel then why do you neeed the springs?

The robot was actually planned to go over the hump, the springs are there to absorb the load of the robot when we hit the bump at speed. To keep us moving in the direction we want to, not being flipped

[yoshibrock]

Originally Posted by 1708xMr.Roboto

The robot was actually planned to go over the hump, the springs are there to absorb the load of the robot when we hit the bump at speed. To keep us moving in the direction we want to, not being flipped

From the way the image is presented, it looks like there isn't going to be enough clearance between the frame and the bump to accomplish a 45 degree climb. The frame would contact the bump before the wheels could.

[1708xMr.Roboto]

Originally Posted by yoshibrock

From the way the image is presented, it looks like there isn't going to be enough clearance between the frame and the bump to accomplish a 45 degree climb. The frame would contact the bump before the wheels could.

The wheel's in the picture are, not the wheels we are going to be using. The Andy Mark 8'' Traction Wheels are what we are going with.

[yoshibrock]

I understand that you're going to be switching the wheels out for traction wheels, but those will only add 2" to your wheel diameter. I can't really tell because of the black background, but it looks as if the framework extends in front of the wheel well and then up at an angle. I didn't do any math, but it intuitively seems that your frame is going to prevent you from climbing the bump by contacting the bump at one of those two points (the bumper zone, or right in front of the wheel).

[1708xMr.Roboto]

With the 8" Andy Mark traction wheels, and the springs being capable of hold about 135 - 145 pds, and we are hoping to have to robot as close to weight this year as possible.

[IKE]

A piece of constructive criticism on the original post.

While this is a pretty neat design, I would recommend add in some hoped objectives. Some years this is a bigger deal than others. This year it is especially important. Statements like "tunnel only" or "planning on going over the bump" will help critics out immensely. Essentially you are asking for a design review. Without knowing your objectives, it is tough to give valuable criticism.

[IKE]

Besides Squirrels Paper idea, I have used Powerpoint to make a few models of dynamics. if you use a 1/10 scale, it is very good size for a single sheet of paper. You can then "group" the components and move them. Throw in a CG point and you can follow CG migration and approximate whether or not you will be in trouble. I may post a white paper example of how to do this.

[Victor_Mec]

Is it a shock absorber or only springs?

I don't understand why use this concept.. Anyway in my opinion you must be carefully with vibrations issues that can affect chassis stability and any other system above the bot.