View Full Version : Pivot arm or telescoping-pivot arm?
Team 2852 DM High Voltage.. St.Catharines Ontario
We've been brainstorming for the last couple days and aside from our base which is already completed a 4 wheel plaction 4 wheel omni dropped down via pneumatic cylinder driven by a 5 CIM motor chain drive configuration with a very low COG we are leaning towards an arm of either telescoping/Pivot or simple pivot....
Dimension are 36" by 12" for the robot with bumbpers...... we figure we can safely get about 100" of reach from a 3 section pivot arm easily
We listed some pros and cons of each and we would just like some extra input.... If anyone has any of their own concepts or input it would be greatly appreciated.
Team 2852 DM High Voltage.. St.Catharines Ontario
We've been brainstorming for the last couple days and aside from our base which is already completed a 4 wheel plaction 4 wheel omni dropped down via pneumatic cylinder driven by a 5 CIM motor chain drive configuration with a very low COG we are leaning towards an arm of either telescoping/Pivot or simple pivot....
Dimension are 36" by 12" for the robot with bumbpers...... we figure we can safely get about 100" of reach from a 3 section pivot arm easily
We listed some pros and cons of each and we would just like some extra input.... If anyone has any of their own concepts or input it would be greatly appreciated.
Emphasis mine. You're only allowed 4 CIMs. <R45>C.
Hey I think you can only have 4 CIM motors this yr
nnfuller
10-01-2011, 23:48
I would say that without some other form of extension you will only be able to receive tubes from the slot, it is possible using a very well designed grasping apparatus to score on all three levels with a simple pivot. The problem only come if you happen to drop a tube... Thats my input.
I would also do some quick math to figure out if your design allows you to score on both the upper, lower, and middle parts of the rack.
davidthefat
10-01-2011, 23:50
One thing to consider, any arm of any sort complicates programming, the more joints there are, more stress for the programmers. Make sure your programmers are competent before designing something complex
Hawiian Cadder
10-01-2011, 23:55
only 4 cims this year bro.
Lil' Lavery
10-01-2011, 23:57
While I realize it's possible to fit 100" of reach into a infinitely tall cylinder, keep in mind the maximum size requirements for during the match is a 60" cylinder.
Chris is me
10-01-2011, 23:58
we figure we can safely get about 100" of reach from a 3 section pivot arm easily
Please read the rules, particularly the volume constraints.
Grim Tuesday
11-01-2011, 00:18
While I realize it's possible to fit 100" of reach into a infinitely tall cylinder, keep in mind the maximum size requirements for during the match is a 60" cylinder.
Or 84, depending if you "do" metric or not.
synth3tk
11-01-2011, 00:41
One thing to consider, any arm of any sort complicates programming, the more joints there are, more stress for the programmers. Make sure your programmers are competent before designing something complex
If they aren't seasoned-enough to program something "complex", then someone best teach them, or they start doing some mad Googling.
While this is a competition, remember that learning is also important, too.
Our team is 3 years into FRC were great programmers and even better engineers.... weve taken 3rd in competition last year and now lower place than 10 in other.....
I beleive i read a revised rule about being able to sue now 5 CIM motors this year.... Other than that as to the reach doing the math you can roughly get about 100" of reach with a 3 pivot arm having it fold up and being able to jsut stay inside the 60" volume constraint...
Anyways... What are your teams thinking of doing?
P.s... KRETZ IS AN AWESOME NINJA ASSASSIN.....
Our team is 3 years into FRC were great programmers and even better engineers.... weve taken 3rd in competition last year and now lower place than 10 in other.....
I beleive i read a revised rule about being able to sue now 5 CIM motors this year.... Other than that as to the reach doing the math you can roughly get about 100" of reach with a 3 pivot arm having it fold up and being able to jsut stay inside the 60" volume constraint...
Anyways... What are your teams thinking of doing?
P.s... KRETZ IS AN AWESOME NINJA ASSASSIN.....
Emphasis mine. Could you cite the rule? I would love to have an extra CIM...
Mike Schreiber
11-01-2011, 12:20
Our team is 3 years into FRC were great programmers and even better engineers.... weve taken 3rd in competition last year and now lower place than 10 in other.....
I beleive i read a revised rule about being able to sue now 5 CIM motors this year.... Other than that as to the reach doing the math you can roughly get about 100" of reach with a 3 pivot arm having it fold up and being able to jsut stay inside the 60" volume constraint...
Anyways... What are your teams thinking of doing?
P.s... KRETZ IS AN AWESOME NINJA ASSASSIN.....
Revised Rule?!?! Update 1 isn't out yet...
ttldomination
11-01-2011, 12:36
Our team is 3 years into FRC were great programmers and even better engineers.... weve taken 3rd in competition last year and now lower place than 10 in other.....
I beleive i read a revised rule about being able to sue now 5 CIM motors this year.... Other than that as to the reach doing the math you can roughly get about 100" of reach with a 3 pivot arm having it fold up and being able to jsut stay inside the 60" volume constraint...
Giving us credentials doesn't make your statements any more correct. We all have copies of the rule book.
<R45>C. one or two additional 2½” CIM motors (part #FR801-001 and/or M4-R0062-12) in addition to those provided in the KOP. This means that up to four, and no more, 2½” CIM motors can be used on the ROBOT.
And initially, you can't be outside the 28'x38'x60'. But AFTER the match starts, your robot is bounded by a 60" diameter, infinitely projected cylinder.
- Sunny
ttldomination
11-01-2011, 13:53
Revised Rule R45 was outdated yesterday as of an update on the usfirst site.... check out the rules section... 5 CIM motors are now allowed
I copied and pasted that rule from the page on the FIRST website. I'm staring at it right now.
And FIRST generally doesn't upload new rules without putting it up in the updates section.
- Sunny
speedbuggy76
11-01-2011, 13:53
Revised Rule R45 was outdated yesterday as of an update on the usfirst site.... check out the rules section... 5 CIM motors are now allowed
I just checked the "Complete Game Manual" and the Individual "The Robot" pdf. They both still read as they did on Saturday, saying that you can only have 4 cims. Can you provide a link?
Grim Tuesday
11-01-2011, 13:54
Revised Rule R45 was outdated yesterday as of an update on the usfirst site.... check out the rules section... 5 CIM motors are now allowed
No they are not. Maybe you should check out the rules section.
EDIT: Well that was the first triple ninja I have ever seen on this forum...
Revised Rule R45 was outdated yesterday as of an update on the usfirst site.... check out the rules section... 5 CIM motors are now allowed
I can't seem to find it. Could you post a URL?
Chris is me
11-01-2011, 14:15
Guys, don't feed the troll, nothing to see here...
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