okie… some work was required in finding this out (not really) but its ok. its all for you guys.
The old motors are 75 rpm. The new ones look the same. And have a free rpm of 50. Life sucks. But… the good part is that they have the same power. Torque is greater in the new motor, they equal out to roughly the same power. So… all it does is force all you people using it to redesign. Great…
so they didnt edit the spec then is what your saying? thats great… :ahh:
Ok…
People are starting to panic because it is week 5 now and such motor problems are not appreciated. Anyway. On to the point.
I have been looking around all over the place to find accurate van door specs. I have not found any. All of them are still the same old ones. Which are very wrong. The information in my first post is correct, it was actually measured. However, all we measured was theoretical power and free speed. So… has anyone measured the actual stall torque, max efficiency, etc? I have lost my confidence in spec sheets.
I asked a question about this on the FIRST Q&A System and it was deleted… who knows what FIRST is doing.
So does anyone have the stall torque numbers for the new vandoor? Without it, there is no equation, and without the equation there is no redesign…
Apparently… :sigh: I have found something that opens an even more frustrating question to this problem.
http://www2.usfirst.org/2005comp/Specs/Taigene_PSD.pdf
shows the spec for motor number:
[left]
[/left]
[left]Specification for motor 16638628 & Specification number 166198[/left]
[left]
[/left]
[left]While the motor we received was actually (as shown in the picture below) number 16644829 Rev02.[/left]
[left]This irritates me. Did we get the wrong motor? Are the spec sheets on the FIRST website the wrong one?[/left]
[left]:sigh: [/left]
[left]Can someone else post as to what number their motor says.[/left]
[left]Oh, and BTW… going by the spec sheet that is on the FIRST site, which says 52RPM at 10.5v and 76 @ 12 Volts, then I believe the spec sheet may be right, and we got the wrong motor. Just a thought though.[/left]
[left]And, to add to this, I personally checked the voltage at the connection of the Van Door and it was around 12v.[/left]
edit: Overall pic of the thumbnail below is found here.
http://www.team237.com/gallery/Build-Season-2005/PDR_2250_Medium
I did an RPM check on our kit van motor and it ran 78rpm
Did the sticker on the motor call out the same part number as the one I attached a thumbnail of, or the spec sheet motor? Cause they seem to be two different models, and/or part numbers. 
Sorry I didn’t check it, but I will tommorow and let you know
I opened ours up. This year’s has a ~104 tooth worm gear (as best as I can count without complete disassembly) and a worm with two threads for a 52:1 reduction. A prior year’s (with a 75rpm free speed) had a 65 tooth worm gear and a single thread worm. So the speed reduction is not due to the gearing.
Ok. What was the part number on the sticker of yours?
Tested ours, this years 51 rpm battery voltage 12.4, Last years 78 same battery voltage. Both will back drive with a wrench, BTW no speed difference on this years motor forward or backward. Sticker on the motor is similar to one further up in the post. Didn’t check the numbers yet. Will do and and edit this post. Ours is the rev 02 and part number 16644829 the same as the pic posted by Elgin Clock post #19
Tom Cooper 1227
Wow, our motor number (16640238 rev 4) is different from both the spec sheet and the thumbnail above. Today, we did a whole lot of testing with textbooks and a multimeter on it, and we’ll come up with a power curve for this given model, and post it up if anyone cares/is willing to believe our Überghetto experiments. What’s really annoying is that there are 4 different models of the “same” motor mentioned in this thread only… What does FIRST have to say on this variety?
Yeah… ours was going slower than previous years motors have. i am not sure about the RPM’s though.
My reply is a bit off, but…
HOW do you attch the shrift of the Van door to a gear or spock
We filed/drilled a tiny ‘dent’ into the shaft and tightened a setscrew into it. There are othe ways, too.
I didn’t time our motor, but our arm was geared based on the specsheet and performing exactly as expected (time/torque wise).
We got a full 80 rpm from ours on a charged battery.
please keep unrelated topics out of this thread…thanks
ok well the people from FIRST finally got back to the Q and A question we posted about having 50RPM on the Taigene Van Door Motor and the answer was…
Please contact frcparts@usfirst.org. Your motor sounds like it is defective.
But then the question was deleted off the system… I don’t get it… :sigh:
Oh well, at least we got an answer.