Yes, it does, but we have found a couple ways around this problem. The first way we deal with this is to move at a lower speed as we approach the junction. The driver can speed up a robot when picking up the cones and heading to the junction, but when the robot approaches it, the driver make the robot return to a slow speed. The other way we deal with this is to lift up the rail and turn the base at the same time as we approach the junction. This allows us to reduce the amount of momentum that is acting on the rails. If we were to move forward while turning the base and lifting the rails, the rails would wobble quite uncontrollably. We also try to drive with the rail lowered until we reach the junction. When we reach the junction m, then we do the step mentioned above.
I've got a question about your lift system, so our team also made a lift, but the problem is when the motar reverses to pull the lift back down, our string is coming loose on the spool. Did you have a similar problem? Or have a possible sollution.
The way it sounds is you are reversing the motor and the rail isn’t going down, so it leads to the string getting loose because the motor continues to spin. Also let me know what rails you are using, because some rails function differently than others. One way to fix it is to first check if the rails go up and down smoothly. Next you want to make sure the string is being fed through the pulleys properly. If you are using the GoBilda viper slides, you should double check it because the way it functions is very confusing due to it using 2 separate strings. Lastly check if the rail can go down or if you can manually push the rail down when the string is on the spool properly and with the robot off, that way you can tell if it is an issue with the string or the friction. Let me know how it goes and if you need any further help, feel free to email me.
Hi, I’m Justin from team 6198. My team also had the idea of mounting a slide on a rotating base plate, but it exceeds the max 18 inches height. Our current slides are the 4 stage viper slides, which measure 15 inches in height. How tall are the slides you use?
The store-bought version of the slides we are using (Cascading X-Rail Slide Kit from ServoCity) were originally 15 inches when collapsed, which was a problem because we needed to mount it onto the rotating base. We were currently at around 20 inches, which was 2 inches above the height limit. We implemented two fixes to solve this problem. The first fix which can be seen in our Sprint 2 video is mounting the rails on the side of the rotating base so that we can drop it until it is hovering over our chassis. this fixed roughly around 1 inches of the height we were overshooting, so we had to implement our second fix, which was cutting each individual rail. This fix was implemented in our Sprint 3 video. This way the total collapsed height of our rail system would be under 18 inches. That being said, cutting each rail by 1 inch meant taking off 4 inches from our highest reach because we have 4 rails in our lifting mechanism. so we cut those 4 rails and added a 5th rail to make up for the lost height. Considering that you guys are using the 4 stage viper slides, I really suggest our first fix, which was figuring out a way to drop the rail down from the side of the rotating base plate. I was tinkering with our own 4 stage viper slide kit and we figured out that if you move around a couple of the pulleys, you eventually find a way to move the motor from the bottom, which adds around 2 inches of height. Look at our sprOne more heads up is don't cut the rails of the viper slides. They are made so precisely and bent in very specific ways for it to function the way it does. if you have any other questions please let us know.
Hello from Moline Robo Squad 15387. We were wondering what motor you ended up going with for the turn table? Also are you using two motors for your lift kit, one for each side or just one motor total for the lift kit? Thank you!
For the turntable, we ended up using a 5.2:1 GoBilda DC motor, which is 1150 rpm. For the lifting mechanism, we are using 2 motors, 1 for each side of the lifting mechanism because we have 2 lift kits.
We poked small holes into the thick rubber band in order to stick a bolt through it and screw on the nut from the other side. If you don't want the rubber material to rip, you can put a washer to have a flat clamp on the rubber band.
Hey Arthur, our rotating base consists of a super duty rotating pan kit by GoBilda and an aluminum base plate on top of the pan kit. It’s a really good mechanism but there are sometimes problems involving stability on it. We’re actively working to solve those problems. We wish you guys a great season!
We changed the grip on our claw due to our previous grip not being able to handle the speed of the new base. Since the base was extremely slow before, the grip could hold on to the cone easily; however, the new base was so fast that the cone would always slip out of the claw grip. So we redesigned it to accommodate this change.
We used a thick rubber band which we secured on both ends on each side of the clamp. This allows for some elasticity for the band to close onto the cone.
Hello, my name is Arjun and I am from team 17181. We want to cut down are robot to a smaller, size but no too much so it won't tip over when we raise the arm. Could you please tell me what's your robot's dimension?
Our robot is 16” in length, 18” in width, and 18” in height in it starting position (when the base is turned left or right). The main chassis is 16” in length, 15” in width, and 12” in height.
Unfortunately, yes. The rule states that the cones can only be oriented upright on a junction to score. Because the cones were oriented sideways while still on the junction, none of them count.
@@HowRobotics What were your selection criteria for the 5.2:1? We're driving our Viper slides with the 13.7:1 and the motor overheats very quickly. Ethan replied that nobody else reported the issue and that it is quite likely (indeed true) that we run continuously against the load owing to rookie mistake(s). Instead of the 5.2:1, we would like to stay 13.7:1 or higher. Any thoughts on paper napkin exercises to select the "optimal" motor for the turntable knowing that it would have to support a 4-Stage slide and a gripper/claw? Thanks.
@@MathaGoram The torque needed to turn the worm gear directly connected to the motor was in the low range of finger-tightening torque; it would be in the range of fractions to a couple of kg.cm. The 1100rpm-motor stall torque was about 8kg.cm, which gave a good margin to use the motor.
There couldn't have been a better ending!🤣
i've always been wondering abou the rotating base, because it looks very wobbly to me, does that effect the control?
Yes, it does, but we have found a couple ways around this problem.
The first way we deal with this is to move at a lower speed as we approach the junction. The driver can
speed up a robot when picking up the cones and heading to the junction, but when the robot approaches it, the driver make the robot return to a slow speed.
The other way we deal with this is to lift up the rail and turn the base at the same time as we approach the junction. This allows us to reduce the amount of momentum that is acting on the rails. If we were to move forward while turning the base and lifting the rails, the rails would wobble quite uncontrollably.
We also try to drive with the rail lowered until we reach the junction. When we reach the junction m, then we do the step mentioned above.
@@HowRobotics i see, basically it's down to the driver to compensate it, thanks
Hello, team 14469! I wish you victory this season. You can help with the codes offline. There are tutorials on offline mode.
I've got a question about your lift system, so our team also made a lift, but the problem is when the motar reverses to pull the lift back down, our string is coming loose on the spool. Did you have a similar problem? Or have a possible sollution.
The way it sounds is you are reversing the motor and the rail isn’t going down, so it leads to the string getting loose because the motor continues to spin. Also let me know what rails you are using, because some rails function differently than others. One way to fix it is to first check if the rails go up and down smoothly. Next you want to make sure the string is being fed through the pulleys properly. If you are using the GoBilda viper slides, you should double check it because the way it functions is very confusing due to it using 2 separate strings. Lastly check if the rail can go down or if you can manually push the rail down when the string is on the spool properly and with the robot off, that way you can tell if it is an issue with the string or the friction. Let me know how it goes and if you need any further help, feel free to email me.
Hi, I’m Justin from team 6198. My team also had the idea of mounting a slide on a rotating base plate, but it exceeds the max 18 inches height. Our current slides are the 4 stage viper slides, which measure 15 inches in height. How tall are the slides you use?
The store-bought version of the slides we are using (Cascading X-Rail Slide Kit from ServoCity) were originally 15 inches when collapsed, which was a problem because we needed to mount it onto the rotating base. We were currently at around 20 inches, which was 2 inches above the height limit. We implemented two fixes to solve this problem. The first fix which can be seen in our Sprint 2 video is mounting the rails on the side of the rotating base so that we can drop it until it is hovering over our chassis. this fixed roughly around 1 inches of the height we were overshooting, so we had to implement our second fix, which was cutting each individual rail. This fix was implemented in our Sprint 3 video. This way the total collapsed height of our rail system would be under 18 inches. That being said, cutting each rail by 1 inch meant taking off 4 inches from our highest reach because we have 4 rails in our lifting mechanism. so we cut those 4 rails and added a 5th rail to make up for the lost height.
Considering that you guys are using the 4 stage viper slides, I really suggest our first fix, which was figuring out a way to drop the rail down from the side of the rotating base plate. I was tinkering with our own 4 stage viper slide kit and we figured out that if you move around a couple of the pulleys, you eventually find a way to move the motor from the bottom, which adds around 2 inches of height. Look at our sprOne more heads up is don't cut the rails of the viper slides. They are made so precisely and bent in very specific ways for it to function the way it does.
if you have any other questions please let us know.
how you made that green part in the grabber
We used a thick rubber band and fastened it on both ends of a bent metal piece which served as the frame of the clamp.
Hello from Moline Robo Squad 15387. We were wondering what motor you ended up going with for the turn table?
Also are you using two motors for your lift kit, one for each side or just one motor total for the lift kit?
Thank you!
For the turntable, we ended up using a 5.2:1 GoBilda DC motor, which is 1150 rpm. For the lifting mechanism, we are using 2 motors, 1 for each side of the lifting mechanism because we have 2 lift kits.
@@maheekarim4782 thank you very much for the information.
How do you attach the gripper material to the metal arm part?
We poked small holes into the thick rubber band in order to stick a bolt through it and screw on the nut from the other side. If you don't want the rubber material to rip, you can put a washer to have a flat clamp on the rubber band.
hello, my name is arthur and I'm from the hydra 16052 team, could you tell me how you made the rotating system?
Hey Arthur, our rotating base consists of a super duty rotating pan kit by GoBilda and an aluminum base plate on top of the pan kit. It’s a really good mechanism but there are sometimes problems involving stability on it. We’re actively working to solve those problems. We wish you guys a great season!
@@HowRobotics Thanks for replying, good season to you too!
Why did you guys change the grip on the claw?
We changed the grip on our claw due to our previous grip not being able to handle the speed of the new base. Since the base was extremely slow before, the grip could hold on to the cone easily; however, the new base was so fast that the cone would always slip out of the claw grip. So we redesigned it to accommodate this change.
What did you use for the new grip on your claw?
We used a thick rubber band which we secured on both ends on each side of the clamp. This allows for some elasticity for the band to close onto the cone.
Hello, my name is Arjun and I am from team 17181. We want to cut down are robot to a smaller, size but no too much so it won't tip over when we raise the arm. Could you please tell me what's your robot's dimension?
Our robot is 16” in length, 18” in width, and 18” in height in it starting position (when the base is turned left or right). The main chassis is 16” in length, 15” in width, and 12” in height.
What happened at the end, is it considered a foul? Hope not.
Unfortunately, yes. The rule states that the cones can only be oriented upright on a junction to score. Because the cones were oriented sideways while still on the junction, none of them count.
What's the name of the 3.5 times faster motor?
Hey there! The new motor on our rotating base is a goBilda 5.2:1 Yellow Jacket Planetary Gear motor. Hope that helps!
@@HowRobotics What were your selection criteria for the 5.2:1? We're driving our Viper slides with the 13.7:1 and the motor overheats very quickly. Ethan replied that nobody else reported the issue and that it is quite likely (indeed true) that we run continuously against the load owing to rookie mistake(s). Instead of the 5.2:1, we would like to stay 13.7:1 or higher. Any thoughts on paper napkin exercises to select the "optimal" motor for the turntable knowing that it would have to support a 4-Stage slide and a gripper/claw? Thanks.
@@MathaGoram The torque needed to turn the worm gear directly connected to the motor was in the low range of finger-tightening torque; it would be in the range of fractions to a couple of kg.cm. The 1100rpm-motor stall torque was about 8kg.cm, which gave a good margin to use the motor.
@@maheekarim4782 Thanks again for the detailed explanations. Regards.