1726 Beginning Week Three

[redbarron]

We are doing a very similar design to yours except I think our shooter will be placed different from yours. I was just wondering if you were planning on controlling the speed of the shooter to adjust to various distances.

Looks GREAT!!

-Mike

[MrForbes]

Kevin (programmer) says "yes! We're planning on using the camera or an ultrasonic sensor to determine distance and adjust the shooter speed accordingly. Human control of the speed shows distance is controllable"

(he was in the kitchen eating cereal....so I asked him....)

[Vikesrock]

Originally Posted by squirrel

Kevin (programmer) says "yes! We're planning on using the camera or an ultrasonic sensor to determine distance and adjust the shooter speed accordingly. Human control of the speed shows it's controllable"

(he was in the kitchen eating cereal....so I asked him....)

This is the major thing we are worried about and unfortunately don't have a great way to test before committing to a design.

Have you tested the effectiveness of altering the distance by changing wheel speed? If so, was spin up/spin down time a factor?

[TheOtherGuy]

We didn't have much time to mess with it tonight (got it firing just before it was time to close the shop ) but we can test this tomorrow and see how effective motor speed is on distance. The roller is spinning at 3700 rpm from one CIM on a 5" roller and 1.5" compression, so spin up time might be a little higher than we expected, but once again, we'll test that tomorrow

[redbarron]

Oh okay that's what we are looking forward to also we got the camera tracking the colors and following them but we have not had a chance to test the ability of judging distance. We are going to using 5" rollers as well but we are running a CIM at a 2:1 so we are more in the range of 2600 rpm. Hopefully we can get the shooter up the rest of the way tomorrow to be able to test distance by Wednesday......

-Mike

[MrForbes]

Our previous test of the shooter was at about 2200 rpm (9 tooth motor sprocket, 22 tooth roller sprocket). Tonight's test was at about 3700 (15 tooth motor sprocket).

[redbarron]

I was doing a quick gear box just using a 12 tooth spur gear on the motor to a 24 tooth spur gear on the output. Now that I seen that I might have the kids test a shooter with the higher range......... did you guys happen to measure how much extra distance was coming out of that extra 1500 rpm?

-Mike

[Brandon Holley]

i saw the banebots gearbox on what appears to be the banebots 545 motor...is this correct? If so, why did you choose this motor for this application, and if you guys can, or have, what did you get as the output RPM of that planetary? Thanks a lot...looks great!

[lynca]

Originally Posted by squirrel

It's a Southwest part...called a Swamp Cooler Blower Pulley. It's a 12" diameter, 1/2" V belt pulley, which happens to have nice flat spokes that are perfect for cutting off and bolting to a piece of plywood. The magic trick is using 3/8" belt on it, so there's an indent for the support bearings to ride in. (also we are going to put normal kit wheel bearings on it to replace the previous year KOP slide bearings)

We tried it and it worked.

This is great COTS engineering for a turret! What kind of support bearings are you using?

How much weight do you think your turret can handle ?

[MrForbes]

Originally Posted by Brandon Holley

i saw the banebots gearbox on what appears to be the banebots 545 motor...is this correct? If so, why did you choose this motor for this application, and if you guys can, or have, what did you get as the output RPM of that planetary? Thanks a lot...looks great!

This is the new 2009 KOP Banebots RS-545 motor, installed on the old 2007 KOP Banebots 64:1 36mm planetary transmission. That transmission is still for sale from Banebots, and although it is sold with an RS-540 motor, it's easy to swap the motors if you have a new pinion gear (we bought several pinion gears and an extra transmission in 2007 because we thought we might use the transmission then, but did not).

[MrForbes]

Originally Posted by lynca

This is great COTS engineering for a turret! What kind of support bearings are you using?

How much weight do you think your turret can handle ?

Right now it has some of those funky grooved bearings from a previous KOP, which are desinged to be used on metal slides. We ordered some of the new KOP wheel bearings, which should fit in place of the funky ones. See our 2009 Build photo gallery on the NERDS web page for more detailed photos.

I don't know how much weight it can handle...but it's handling about 12 lbs right now, and seems to be pretty sturdy. I dontk now how it would fare against a direct hit from something during a match...we'll have to think about that. If the robot fell over, it could be damaged.

[Brandon Holley]

Originally Posted by squirrel

This is the new 2009 KOP Banebots RS-545 motor, installed on the old 2007 KOP Banebots 64:1 36mm planetary transmission. That transmission is still for sale from Banebots, and although it is sold with an RS-540 motor, it's easy to swap the motors if you have a new pinion gear (we bought several pinion gears and an extra transmission in 2007 because we thought we might use the transmission then, but did not).

We were looking at using the same exact planetary with that motor, however using it in a different application than a turret....thats why I was asking for the output RPM....thanks for the info though!