End Task

erico.vert
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Re: End Task

Postby erico.vert » January 13th, 2019, 3:12 pm

PM2017 wrote:
MgEHS22 wrote:When it says before it becomes the highest point of the device, does that include a pulley that pulls the platform up?

Yes, it does. An easy solution is to have a superstructure under the platform, that has a point at which the string attaches. this point could be below the the pulley, while the attached platform itself is above.

This is exactly what I did for one of my competitions but be careful as to how fast the platform is lifted. If it goes too fast, the battery will be launched off of the platform.

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Re: End Task

Postby bradley310 » January 18th, 2019, 1:44 pm

Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd

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Re: End Task

Postby TheSquaad » January 18th, 2019, 2:05 pm

bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I’d say no. By definition a platform with a hole is not a smooth uniform surface.

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Re: End Task

Postby CookiePie1 » January 18th, 2019, 2:13 pm

TheSquaad wrote:
bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I’d say no. By definition a platform with a hole is not a smooth uniform surface.


A way you could get around drilling a hole through it is to make a small platform that has a hole, and then just add another platform on the side.
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Re: End Task

Postby Vortexx » January 18th, 2019, 4:57 pm

bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I'm not sure if this would even fit the requirements for the final task. It is 24V (when we get 9V) and it only has a travel distance of 7" (about 17.78 cm) when we need 20 cm.
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TheSquaad
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Re: End Task

Postby TheSquaad » January 18th, 2019, 8:41 pm

Vortexx wrote:
bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I'm not sure if this would even fit the requirements for the final task. It is 24V (when we get 9V) and it only has a travel distance of 7" (about 17.78 cm) when we need 20 cm.


If you ask me, ditch the screw shaft idea.
Attaching the platform to a motorized winch is far simpler.

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Re: End Task

Postby tbraford02 » January 23rd, 2019, 5:01 pm

What could work as an end action for a 59.7x59.3x47 cm box? I've looked online at homemade scissor lifts made with popsicle sticks and it seems that there would be 1) no way to lift it manually and 2) it would break under pressure.

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Re: End Task

Postby erico.vert » January 23rd, 2019, 8:24 pm

TheSquaad wrote:
Vortexx wrote:
bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I'm not sure if this would even fit the requirements for the final task. It is 24V (when we get 9V) and it only has a travel distance of 7" (about 17.78 cm) when we need 20 cm.


If you ask me, ditch the screw shaft idea.
Attaching the platform to a motorized winch is far simpler.

I agree with Vortexx. A 9v power supply wouldn't be able to drive this motor and even if it could it doesn't have enough displacement from the start point. As for the screw shaft idea in general, it takes a little bit of finagling but I got mine to work very consistently on a 6v motor. It isn't that complicated, but definitely takes some thinking.

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Re: End Task

Postby TheSquaad » January 24th, 2019, 5:07 am

tbraford02 wrote:What could work as an end action for a 59.7x59.3x47 cm box? I've looked online at homemade scissor lifts made with popsicle sticks and it seems that there would be 1) no way to lift it manually and 2) it would break under pressure.


First off, your device is huge. I’d seriously consider cutting it down before moving further.

Second, look at the sample ASL. The example final task is extremely simple and smart.

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Re: End Task

Postby kaushald21 » January 24th, 2019, 11:49 am

How are you guys accomplishing the end task?

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Re: End Task

Postby jinhusong » January 24th, 2019, 12:03 pm

scissors lift (with actuator) or slide up with pulley (geared motor)

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Re: End Task

Postby Flavorflav » January 25th, 2019, 5:37 am

TheSquaad wrote:
bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I’d say no. By definition a platform with a hole is not a smooth uniform surface.

It doesn't say "uniform" in the rules. It just says
a single surface that is hard, non-tacky, and smooth with no lip on any of its edges

A single surface with a hole in it is still a single surface, IMO.

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Re: End Task

Postby TheSquaad » January 25th, 2019, 5:55 am

Flavorflav wrote:
TheSquaad wrote:
bradley310 wrote:Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd


I’d say no. By definition a platform with a hole is not a smooth uniform surface.

It doesn't say "uniform" in the rules. It just says
a single surface that is hard, non-tacky, and smooth with no lip on any of its edges

A single surface with a hole in it is still a single surface, IMO.


In my interpretation, smooth means that there are no deviations in the texture of the surface across the entire area of the square. A hole doesn’t exactly have the same texture as any material.

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Re: End Task

Postby Flavorflav » January 25th, 2019, 7:41 am

I think they said "smooth" so you couldn't cover it in sandpaper to reduce the likelihood of the battery tipping over, but I can see your argument. I suppose we'll have to see what SOINC says if they answer the question I just put. Of course, they haven't answered any of my other questions, so I won't hold my breath. I will say that a hole in the square was not a problem at the two invitationals we attended.

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Re: End Task

Postby nicholasmaurer » January 25th, 2019, 8:00 am

Flavorflav wrote:I think they said "smooth" so you couldn't cover it in sandpaper to reduce the likelihood of the battery tipping over, but I can see your argument. I suppose we'll have to see what SOINC says if they answer the question I just put. Of course, they haven't answered any of my other questions, so I won't hold my breath. I will say that a hole in the square was not a problem at the two invitationals we attended.


My concern would be whether a "perfectly square" platform with a hole is still a perfect square. If I ask you to diagram a perfect square, I doubt there would be a circle in the middle somewhere.
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