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Unread 02-24-2017, 08:19 AM
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Al Skierkiewicz Al Skierkiewicz is offline
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Al's Annual Inspection Thread

OK,
It is that time of the year again. But I don't know if it is needed. Do you want me to continue the tradition this season?
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Unread 02-24-2017, 09:11 AM
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Re: Al's Annual Inspection Thread

While this has already posted in other threads. Checking your robot against the inspection check list is always a good first (and and last) step.
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Unread 02-24-2017, 10:07 AM
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by Al Skierkiewicz View Post
OK,
It is that time of the year again. But I don't know if it is needed. Do you want me to continue the tradition this season?
I have always found it quite valuable and insightful, and appreciate your willingness to continue.

My question: We are planning on using a rope climbing system that consists of a rod with protruding bolts (~2" in length) that will catch and wind the loop on the end of our team rope (rotating at about 3 rev/sec). We plan to have a safety pin installed as a hardstop whenever the robot is not on the field to prevent rotation. Is this sufficient safetywise, or would there be other things that RIs would like to see?
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Unread 02-24-2017, 10:12 AM
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Re: Al's Annual Inspection Thread

Our robot this year will have 4 'harpoons' that are propelled via surgical tubing and will fire at the start of autonomous, will a lip to retain the harpoons be sufficient for transport or should we plan on installing pins to hold them in for transport? Would there be any safety issue with transporting them fully extended other than possibly getting through doorways?

Just in case anyone thinks I'm joking with this, I'm not.

EDIT: And Al, I am genuinely being serious, we don't have any real safety mechanism holding them back at the moment. If they hit someone it would be about the roughly equivalent of being thumped hard. Not an issue when at robot height but up higher and eye height could be a concern. Should we plan on this being pointed out as a safety concern and have a plan to resolve it?
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Last edited by marshall : 02-24-2017 at 10:24 AM.
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Unread 02-24-2017, 10:16 AM
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by marshall View Post
Our robot this year will have 4 'harpoons' that are propelled via surgical tubing and will fire at the start of autonomous, will a lip to retain the harpoons be sufficient for transport or should we plan on installing pins to hold them in for transport? Would there be any safety issue with transporting them fully extended other than possibly getting through doorways?

Just in case anyone thinks I'm joking with this, I'm not.
As long as the harpoons remain within whichever volume (A or B) you choose you should be fine.
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Unread 02-24-2017, 10:18 AM
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by marshall View Post
Our robot this year will have 4 'harpoons' that are propelled via surgical tubing and will fire at the start of autonomous, will a lip to retain the harpoons be sufficient for transport or should we plan on installing pins to hold them in for transport? Would there be any safety issue with transporting them fully extended other than possibly getting through doorways?

Just in case anyone thinks I'm joking with this, I'm not.
I find this hilarious. You guys finally figured out how to work this #recyclerushtb
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Unread 02-24-2017, 10:25 AM
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Re: Al's Annual Inspection Thread

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Originally Posted by ChuckDickerson View Post
As long as the harpoons remain within whichever volume (A or B) you choose you should be fine.
See edited addendum above but we are definitely within volume.
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Unread 02-24-2017, 10:30 AM
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Re: Al's Annual Inspection Thread

If you are indeed serious then a video is in order before any serious discussion on legality and safety can be addressed.
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Unread 02-24-2017, 10:38 AM
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by marshall View Post
Our robot this year will have 4 'harpoons' that are propelled via surgical tubing and will fire at the start of autonomous, will a lip to retain the harpoons be sufficient for transport or should we plan on installing pins to hold them in for transport? Would there be any safety issue with transporting them fully extended other than possibly getting through doorways?

Just in case anyone thinks I'm joking with this, I'm not.

EDIT: And Al, I am genuinely being serious, we don't have any real safety mechanism holding them back at the moment. If they hit someone it would be about the roughly equivalent of being thumped hard. Not an issue when at robot height but up higher and eye height could be a concern. Should we plan on this being pointed out as a safety concern and have a plan to resolve it?
Are y'all working on a throwback to your harpoons in 2015?
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Unread 02-24-2017, 10:42 AM
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Al Skierkiewicz Al Skierkiewicz is offline
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by marshall View Post
Our robot this year will have 4 'harpoons' that are propelled via surgical tubing and will fire at the start of autonomous, will a lip to retain the harpoons be sufficient for transport or should we plan on installing pins to hold them in for transport? Would there be any safety issue with transporting them fully extended other than possibly getting through doorways?

Just in case anyone thinks I'm joking with this, I'm not.

EDIT: And Al, I am genuinely being serious, we don't have any real safety mechanism holding them back at the moment. If they hit someone it would be about the roughly equivalent of being thumped hard. Not an issue when at robot height but up higher and eye height could be a concern. Should we plan on this being pointed out as a safety concern and have a plan to resolve it?
I would have to start by asking what is your definition of a "harpoon". My definition is a projectile that travels a distance by force applied to said projectile with the intent of puncturing an object (living or not) and then preventing that 'harpoon' from being pulled from the target object.
I can think of nothing that would fit inside the 2017 robot rules and be effective in this year's game.
I would continue to need to evaluate the 'harpoons' by actually seeing them in person and in action.
In my opinion, a hard thump would cause me great concern under R07:
R07. ROBOT parts shall not be made from hazardous materials, be unsafe, cause an unsafe condition, or interfere with the operation of other ROBOTS.
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Unread 02-24-2017, 10:43 AM
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Re: Al's Annual Inspection Thread

Time to change the title of this thread to "FRC 900 2017 Robot Teaser"
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Unread 02-24-2017, 10:49 AM
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by Al Skierkiewicz View Post
I would have to start by asking what is your definition of a "harpoon". My definition is a projectile that travels a distance by force applied to said projectile with the intent of puncturing an object (living or not) and then preventing that 'harpoon' from being pulled from the target object.
I can think of nothing that would fit inside the 2017 robot rules and be effective in this year's game.
I would continue to need to evaluate the 'harpoons' by actually seeing them in person and in action.
In my opinion, a hard thump would cause me great concern under R07:
R07. ROBOT parts shall not be made from hazardous materials, be unsafe, cause an unsafe condition, or interfere with the operation of other ROBOTS.
'Harpoon' is perhaps a stretch then and a bit artistic on my part. It's definitely a contained mechanism within the volume restrictions allowed.

It definitely extends and does so quickly. Pneumatics would fall under that too then wouldn't they? I mean, ours is far less than 60 lbs of force when extending and is doing so with some small surgical tubing. Would pneumatic extensions also be a concern?
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Unread 02-24-2017, 10:55 AM
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Re: Al's Annual Inspection Thread

I think the concern behind "harpoon" that separates it from pneumatic pistons is the controlled aspect of it. A piston has a very controlled motion - it travels a set distance in a straight line, no farther. A harpoon, on the other hand, implies a more uncontrolled launching of a shaft. It may be constrained distance wise with a cable, but once it's launched it can travel anywhere based solely on the momentum within the harpoon.

So when you say harpoon, I picture the devices you built a champs for Recycle Rush. The total travel distance was constrained, but once launched the harpoons went where they wanted, bounced off things and changed direction, etc.

A video of the device in question would really help us understand what you're trying to describe.
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Unread 02-24-2017, 10:56 AM
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Re: Al's Annual Inspection Thread

Quote:
Originally Posted by Jon Stratis View Post
I think the concern behind "harpoon" that separates it from pneumatic pistons is the controlled aspect of it. A piston has a very controlled motion - it travels a set distance in a straight line, no farther. A harpoon, on the other hand, implies a more uncontrolled launching of a shaft. It may be constrained distance wise with a cable, but once it's launched it can travel anywhere based solely on the momentum within the harpoon.

So when you say harpoon, I picture the devices you built a champs for Recycle Rush. The total travel distance was constrained, but once launched the harpoons went where they wanted, bounced off things and changed direction, etc.

A video of the device in question would really help us understand what you're trying to describe.
Sadly I don't have a video to post at the moment. These devices are held within a slot and cannot bounce or extend beyond their intended extension distance, which is within allowed robot volume.
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Unread 02-24-2017, 10:57 AM
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Re: Al's Annual Inspection Thread

So it's not so much a harpoon as a surgical tubing powered linear actuator?
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