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lifted_chevy 10-01-2008 01:08

Fisher price motors
 
I was just wondering if anyone has heard anything bad about the fisher price stuff. I've heard that they r bad and can over heat.

Drwurm 10-01-2008 01:17

Re: Fisher price motors
 
FP motors are great motors. They are very strong and many veteran teams make use of them regularly.
If you're worried about overheating, you can couple 2 victor sized fans to the body of the motor.

AdamHeard 10-01-2008 01:59

Re: Fisher price motors
 
Quote:

Originally Posted by Drwurm (Post 674113)
FP motors are great motors. They are very strong and many veteran teams make use of them regularly.
If you're worried about overheating, you can couple 2 victor sized fans to the body of the motor.

Mostly right. Just left some details out.....

They don't like to be stalled, so avoid conditions in which they will be.

Scott Morgan 10-01-2008 02:04

Re: Fisher price motors
 
The Fisher Price motors are some of my favorite motors in the kit. They're light but powerful.

That said they are likely to overheat if they are stalled, but I would say that if used properly they are very reliable.

lifted_chevy 16-01-2008 22:56

Re: Fisher price motors
 
Thanks everyone for your help
does anyone have any info on how to make a forklift

JB987 16-01-2008 23:05

Re: Fisher price motors
 
Has any team had any luck finding a place to buy additional FP motors??? We have put hours into online searches and phone calls to many possible sources, including of course Fisher Price, and Mattel and they as well as several service centers told us that due to liability (fire based recalls) that they can't sell motors/gearboxes anymore...they can only install them themselves...can anyone out there graciously help out?

vivek16 16-01-2008 23:15

Re: Fisher price motors
 
hmm... two questions Mr. Barry,

1. have you considered looking at products in which they come and ripping them out of there?

2. are you allowed to use more than two? I thought two was the limit.

good luck, vivek

EricH 16-01-2008 23:19

Re: Fisher price motors
 
Quote:

Originally Posted by vivek16 (Post 679808)
hmm... two questions Mr. Barry,

1. have you considered looking at products in which they come and ripping them out of there?

2. are you allowed to use more than two? I thought two was the limit.

good luck, vivek

Two is the limit, but there is no limit as to spares.

As for them not selling the motor, try telling them that you are with the FIRST robotic competition. They might understand why you need only the motor then.

65_Xero_Huskie 16-01-2008 23:49

Re: Fisher price motors
 
Quote:

Originally Posted by lifted_chevy (Post 674097)
I was just wondering if anyone has heard anything bad about the fisher price stuff. I've heard that they r bad and can over heat.

We always use Fisher Price motors, and the only way they can go bad is if you engineer something that isnt up to the Fisher Price standards. Id have to say they have been the staple to our past couple years of drivetrain.

Andy A. 17-01-2008 00:04

Re: Fisher price motors
 
The fisher-price motor has been with FIRST for years, in various models and makes. They all are around a 100 watt motor in a 550 can. They have, far and away, the highest power to weight/volume ratio of any motor in the kit.

The downside of that power in a small package is heat. These motors will very quickly overheat and fry if allowed to stall or even under load at low speed. They work fantasticly, right up to that critical temperature where the insulation melts. Reach that and the motor dies in seconds. There are ways to avoid that point, however.

1. Don't worry much about using heat sinks and fans etc. These motors, like all motors, overheat in the windings. Cooling the can doesn't do you any good over the course of a two minute match and the duty cycle these motors encounter. By the time the heat makes it through the end bearings to the can it's already done it's damage. If the rounds lasted longer and the motors ran a consistent speed the whole way through heat sinks and fans would make more sense.

2. Do not stall or overload the motor. I've heard 2/3 free speed kicked around as a good number to gear for. That means that you should gear such that, loaded, the motor should not drop below 2/3's of it's free speed.

3. Do not block the cooling vents. These motors have plastic fins attached to the back end of the armature shaft. These provide the only real means of 'active' cooling. If you don't block the vents and keep the motor spinning fast they are perfectly adequate at keeping the motor from frying. Let it get too hot and the fins melt off. After that happens it's about 3 seconds before all the magic smoke comes out. As always, the faster these motors are spinning the happier they are.

4. If at all possible, keep the vents on the front of the motor clear. If you can stand off the motor just a little bit to keep the front vents open then a good deal of air from the fan will pass over the armature and right out the front. I can't offer any hard data on how much this improves cooling, but it can only help.

5. In between back to back matches you can hose the motor down with cool-in-a-can or compressed air cans turned upside down. It's not good for the motor but it's probably better then running into a match preheated.

Always keep in mind that these motors have to make it through two minute matches at a time. You can get away with just about anything short of a stall or low speed under load. If you get through a day of matches on one set of FP motors, I consider it a win. Balance the longevity and health of the motor against the design of your robot. Maybe beating the snot out of the motors is the only way to get something to work right on the robot. If so, then balance that against your budget and ability to find replacements.

-Andy A.

popo308 17-01-2008 00:27

Re: Fisher price motors
 
we found a place to buy them last year i will see if i can dig the site back up for you guys ill get back to you on that!

JB987 17-01-2008 00:32

Re: Fisher price motors
 
Quote:

Originally Posted by popo308 (Post 679889)
we found a place to buy them last year i will see if i can dig the site back up for you guys ill get back to you on that!

Thanks, Brent...hope you can help us, and all the others that may be looking for spare FP's.

popo308 17-01-2008 00:34

Re: Fisher price motors
 
http://kidswheels.com/vmchk/Gearboxe...els-Other.html

Here is a link to a website that sells FP motors you will have to look around on the page a bit. They also sell different gearbox's for FP motors.

HOPE THIS IS WHAT YOUR LOOKING FOR

popo308 17-01-2008 00:42

Re: Fisher price motors
 
http://kidswheels.com/Gearboxes-Powe...-19-Pitch.html
I believe that is the exact one they send with the KoP

Tristan Lall 17-01-2008 00:51

Re: Fisher price motors
 
Quote:

Originally Posted by popo308 (Post 679902)
http://kidswheels.com/Gearboxes-Powe...-19-Pitch.html
I believe that is the exact one they send with the KoP

Though the number of pinion teeth is the same, you absolutely must verify the model number on the motor itself. There are many Fisher-Price motors which have 19 teeth; only 00968-9015 is legal for 2008.


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