deadline
 

arg! if anyone has any clue about the specs contribute it, seeing as we all need the drive trains finished soon, in my case Monday (originally), but without output data, I'm not sure I'll meet that deadline for my team. also, if anyone can clear up the figures given on sprockets by MSC, it would be appriciated seeing as I'm at a disadvatage with no engineer help this year.

Look Here
 

I have compiled the data. Most of which is in the manual where the drill motor is listed, but I had to experimentally determine the free amps.

Look here:

http://www.chiefdelphi.com/forums/pa... SC&sort=date

You will find data for the Fisher-Price, Drill and Chiaphua. I am 100% sure about the Fisher-Price and Chiaphua, but 95% sure about the drill. From my initial test, the numbers look good.

The link is to the white papers section from a presentation I gave at the Novi Kickoff. I updated the motors with the new information. This should be enough for you to get working until FIRST gets their numbers together.

Please note that there is another white paper regarding the Fisher-Price motor that I posted. It is the motor manufacturers data sheet and it corresponds with my number in the presentation.

-Paul

thank you

a word of advice. if get the brilliant idea of hooking the drill motor and gearbox directly to the battery:yikes: , be sure u are holding both parts of the transmission. This tranny does not stay together well!!

Drill Specs
 

The specs for Bosch 3360 drill, which is where I'm guessing this motor comes from, on the boschtools.com web site lists the drill as having a stall torque of 400 lb-in (45.3 N·m) and a no-load speed of 450 rpm in low gear. Doing a little math that gives it a stall current 185A at 12V and a peak power output of 527 watts. In high gear you'd get stall torque of 12.7 N·m and a no-load speed of 1598 rpm and with no gear box you'd get stall torque of 1.06 N·m and a no-load speed of 19170 rpm.

Greg
Enigma Industries

The motor stall torque is also in the parts list, this times the reduction ratio and assume the efficiencies are similar to the old transmissions, 80% in high and 70% in low. This will get you most of the way. Remember the torque of D.C. motors is linear between max at stall and 0 at free speed RPM.

has anybody gotten the specs from the manufacture? I must have missed the specs and I am looking all over for the specs from the manufacture. Can anybody help. Please attach the file to the forum and I will get back to it. Thanks.

So are these numbers correct? I've been checking out all the threads about the drill motors and these are the only numbers I've found.

First posted a bunch of specs today:

http://www.usfirst.org/robotics/2003/specsheets.htm

Be careful though, the "drill motor" specs seem to be for two different motors. Was there more than one type of drill motor in the kit?

Greg Christensen
Enigma Industries

thank you
 

I bow down to your superior ability to stand the first ability to not post things and hunt them down! now maybe I can actually get some work done! thank you!

Did anyone else notice that the Drill Motor curve is for motors running at 11V? Any ideas on how a 12V setup would compare? I'm guessing it's almost identical, but then again, strange things happen when you up the voltage to motors.

Could it be that the specs are for Forward and Reverse?
Just a thought!

I'm even more confused by the drill motor gear specs (assuming that's what they specify). From the looks of things, it specifies a 13 tooth gear at a 20 degree pressure angle. Now, I counted the number of teeth on the output gear of our motors. It was most definitely 15 teeth. I only counted one motor but I'll check out the other one tonight. Anyone know what's up with that?

Matt

If you look at Skill Bosch Motor Curve the motor's part number is different from the part number listed in the kit of parts documentation.

It Checks Out
 

The part number on the motor data curve IS the same number as printed on the motor. The FIRST manual is inaccurate. The raw numbers printed in the chart for 12V (lower left corner) checks out with what FIRST gave us and with what I noticed for free amps.

-Paul