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  #31   Spotlight this post!  
Unread 14-01-2005, 09:45
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Re: 2005 FP Pinion

We've got another pair of

74550-0642
TD034701
13 tooth pinion
Haven't measured resistance.

We really need to get this cleared up soon because we've all got to buy some gears and sprockets and we need the correct torque/power/speed data...
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  #32   Spotlight this post!  
Unread 14-01-2005, 09:46
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Re: 2005 FP Pinion

Quote:
Originally Posted by Joe Johnson
If I were you, I would a stall the motor (for a short period of time) at 0.8 volts or so and accurately measure the voltage accross the motor and the current. If the current is not about 10 Amps at 0.8V (i.e. the Resistance should be 0.08 Ohms per the spec) ,you have confirmation that you have a different motor than the rest of us.
Dr. Joe, did you measure it already, or is this a calculated value?
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Unread 14-01-2005, 10:16
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Re: 2005 FP Pinion

Quote:
Originally Posted by Andy Brockway
I checked our motors last night.

13 tooth
74550-0642
TD014602 - this is different, but what does that mean?
Just checked our FP motors.
13 tooth
74550-0642
TD034701
Made in China

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  #34   Spotlight this post!  
Unread 14-01-2005, 10:45
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Re: 2005 FP Pinion

Quote:
Originally Posted by Joe Ross
Dr. Joe, did you measure it already, or is this a calculated value?
I will try to get to this over the weekend. Sadly, the power supply I need to do this is back here at Delphi and the parts are in Pontiac (about 1/2 hour away).

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  #35   Spotlight this post!  
Unread 16-01-2005, 13:50
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Re: 2005 FP Pinion

Quote:
Originally Posted by Joe Johnson
I will try to get to this over the weekend. Sadly, the power supply I need to do this is back here at Delphi and the parts are in Pontiac (about 1/2 hour away).

Joe J.
Checked ours, 13 teeth
Read the Friday Email about the Typo in the kit for the FP's. I also had the kids measure the free speed with the transmission. 144 rpm, battery fully charged, fuse, no victor. which is no surprise as last years was 130 same conditions.
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  #36   Spotlight this post!  
Unread 18-01-2005, 13:51
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Re: 2005 FP Pinion

Here are a couple measurements on our 2005 Fisher Price Motor

13 teeth; 1/2" O.D. pinion

Part ID# 74550-0642
Code: TD034701


Measured RPM*:
24,500 @ ~12V (voltage approx)
12,000RPM @ 6.0V
-11,600RPM @ -6.0V (reverse direction)
* Measured using R/C airplane hobby tach & transparent disc w/stripe


Motor Resistance**:
0.069 - 0.074 ohms

**Measured with 10A current source; 4 point measurement of 0.69-0.74 V while turning rotor between fingers

Calculated stall current from above:
162 - 173A (12V/0.069ohms; 12V/0.074ohms)


All these measurements agree well enough by those provided by Paul Copiola at

http://www.chiefdelphi.com/forums/sh...ad.php?t=32442

-David
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Unread 22-01-2005, 19:10
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Question Re: 2005 FP Pinion

To take this question to the next level;

Does anyone know or want to hazard a gues as to what the pressure angle is on the gears used in the FP transmission?

Matt B
  #38   Spotlight this post!  
Unread 23-01-2005, 13:09
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Re: 2005 FP Pinion

Quote:
Originally Posted by MattB703
Does anyone know or want to hazard a gues as to what the pressure angle is on the gears used in the FP transmission?
20° (at least, that's what the old ones were). The new gears look like they have the characteristic "sharp" teeth, so short of taking measurements, I'd definitely say that that's what they are.
  #39   Spotlight this post!  
Unread 23-01-2005, 13:25
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Re: 2005 FP Pinion

Quote:
Originally Posted by Tristan Lall
20° (at least, that's what the old ones were). The new gears look like they have the characteristic "sharp" teeth, so short of taking measurements, I'd definitely say that that's what they are.
From history, I'd say you are pretty safe in saying it is a 20 Degree Pressure angle.

They typically use standard DP and pretty standard gears (no enlargements or thickening of teeth, etc.).

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  #40   Spotlight this post!  
Unread 23-01-2005, 15:23
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Re: 2005 FP Pinion

So is this 32 DP like the others?
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  #41   Spotlight this post!  
Unread 23-01-2005, 22:51
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Re: 2005 FP Pinion

Quote:
Originally Posted by rmmlg
So is this 32 DP like the others?
Definitely. And I tested the mesh today with some good quality 20° PA gears, and I'm even more confident that nothing has changed.

13 T, 32 P, 20° PA
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