2006 Motor Specs

[Xufer]

Who knows where the 2005 motor specs can be found ? last year they were in the manual this year i dont see them there.

Thanks.

[ryan_f]

it was explained in the webcast. 36 teams are making the specs and will be publishing them

[Elgin Clock]

http://www.usfirst.org/robotics/2006...s.htm#Section5

Under



Other Important Documents 2006 FIRST Robotics Competition Specification Sheets

Originally Posted by ryan_f

it was explained in the webcast. 36 teams are making the specs and will be publishing them

edit: Yes, that is correct., but those will be "real world applications" for FIRST as opposed to the data shown in my link above which is directly from the manufacturers of said parts.

[Veselin Kolev]

Fairly accurate motor speeds: (no load)

CIM: 3590 rmp
Larger CIM: 2180 rpm
Fischer Price: 10,280 rpm

Found using a precision strobe light with adjustable ticks per minute. Accuracy is about +- 0.5% on the motor speeds.

Have fun, all.

[Joe Johnson]

Originally Posted by Veselin Kolev

...
Found using a precision strobe light with adjustable ticks per minute. Accuracy is about +- 0.5% on the motor speeds.
...

Typical tolerances on motors are +/-10-15% and that doesn't include variations due to voltage.

I have never designed a motor/gearbox application where the performance of the motor had to be within .5%, certainly never in FIRST...

For what it is worth.

Joe J.

[Veselin Kolev]

Originally Posted by Joe Johnson

Typical tolerances on motors are +/-10-15% and that doesn't include variations due to voltage.

I have never designed a motor/gearbox application where the performance of the motor had to be within .5%, certainly never in FIRST...

For what it is worth.

Joe J.

Joe, you are totally right.
However, what I mean is that the speed of the motors I got were measured to within 0.5% accuracy. There probably is a lot of fluctuation in the speeds of motors across the country, I was just letting people know that my equipment is quite precise.

Just to clarify

[Joe Johnson]

I have not had a chance to look at everything but from what I can tell so far these are the motors in order of wattage:

• 4 - Old CIM (340W)
• 2 - New CIM (270W)
• 2 - Fisher Price motors (170W)
• 1 - Bosch Motor (70W - based on old 12V specs of 35N-m stall & 75RPM Free)
• 2 - Globe Motors (50W)
• 2 - Denso Motors (25W)
• 1 - Mabuchi Motor (15W)

Am I missing any? I suppose there is the servos that are probably more powerful that 1W*, but they are harder to get continuous power out of since they don't automatically keep putting out work, they only do continous work if your program does some fancy footwork to keep the things moving (winding a mechanism or something I suppose is possible, but probably not worth the bother).

There is an very nice, rich set of motors for teams to pick from. Well done FIRST.

By the way, I am in the process of evaluation THESE MOTOR/GEARBOXES from BaneBots.com. For about $40 you can get gearboxes that the Fisher-Price and the Mabuchim motors will just bolt to. They come in a variety of ratios (5:1, 16:1, 20:1, 25:1, 64:1, 100:1, 256:1). The gearboxes have nice mounting points and long, easy to access (and support) D'ed shafts. And I just talked to them yesterday, they have 1000's in stock. Look for my recommendation or my non-recommendation early next week. I have no connection to these guys at all, I just found them on ebay a while back while looking for stuff for Robotic Amusements.

Joe J.



P.S. By the way, I have just found a table in this document that I believe is in error. It has the peak power of the FP motor over 300 Watts. This does not match the specs in the spec sheets or even the specs in the rest of the table in the same document. I believe my numbers are correct. Also, the Bosch and the Globe are listed as non-12V specs you have to scale the power ratings accordingly to get apples to apples comparisons.



*this message was written before I had corrected an error in converting g-cm's to N-m . I had the Mabuchi at 1W, when the motor is actually 15W or so. I have since went to the hitecrdc spec site for the 323HD servo. If I have not made another calc error, the servo motors are able to put out about .5W or so if you can load them at their 6V peak power point -- not exactly what you would call a real workhorse.

[Kit Gerhart]

Originally Posted by Veselin Kolev

Fairly accurate motor speeds: (no load)

CIM: 3590 rmp
Larger CIM: 2180 rpm
Fischer Price: 10,280 rpm

Found using a precision strobe light with adjustable ticks per minute. Accuracy is about +- 0.5% on the motor speeds.

Have fun, all.

Something's wrong here. The old CIM's have a no-load rpm of around 5300 rpm and the F/P are 20,000+.

[I'mwithstupid^]

Originally Posted by Kit Gerhart

Something's wrong here. The old CIM's have a no-load rpm of around 5300 rpm and the F/P are 20,000+.

could his motors have been worn down to those low rpms?

[Cory]

Originally Posted by I'mwithstupid^

could his motors have been worn down to those low rpms?

Not if he was testing one he got out of the KOP.

[David Guzman]

Are the the specs pointed out by Elgin at

http://www.usfirst.org/robotics/2006/2006specsheets.htm

accurate and reliable enough to start designing.

Dave

[Tristan Lall]

Originally Posted by Cory

Not if he was testing one he got out of the KOP.

Which begs the question, are the old ones legal? Because they're (apparently) different. Same model number, though; would it have hurt to call it FR-801-002, if it were different?

Edit: I see the spec sheet for 2006 is unchanged; so someone should verify the speeds with their motors, old and new.

[Veselin Kolev]

I tested a 2004 CIM with the same method, and I get 5320 rpm, which sounds normal. You can actually hear the difference in rpms between the old and new motors.

[Larry Barello]

Originally Posted by Joe Johnson

...
By the way, I am in the process of evaluation THESE MOTOR/GEARBOXES from BaneBots.com. For about $40 you can get gearboxes that the Fisher-Price and the Mabuchim motors will just bolt to. They come in a variety of ratios (5:1, 16:1, 20:1, 25:1, 64:1, 100:1, 256:1). The gearboxes have nice mounting points and long, easy to access (and support) D'ed shafts. And I just talked to them yesterday, they have 1000's in stock. Look for my recommendation or my non-recommendation early next week. I have no connection to these guys at all, I just found them on ebay a while back while looking for stuff for Robotic Amusements.

Joe, which of the 20:1 gearboxes would mate with the FP motor? Would I need to replace the pinion? Does Bane's pinion mate with the FP shaft?

Thanks!

[Joe Johnson]

Originally Posted by Larry Barello

Joe, which of the 20:1 gearboxes would mate with the FP motor? Would I need to replace the pinion? Does Bane's pinion mate with the FP shaft?

Thanks!

Go Here too see the answer

Good Luck,

Joe J.