Question On New Motors/Batter Boxs

[dandexter]

I'v got a few questions about the new motors and such. I'v got a fair bit of experience with the older style ones, but not with the new ones.

1. How many of the 58121 (big motor) can I connect to one battery box?

2. Approx. how much weight can one of those motors move?

Thanks for the help.

[KEvron]

2. Approx. how much weight can one of those motors move?

that depends on the manner in which you're moving the weight. rather than try to suss the specifics, i can point you toward philo's report on technic motors.

KEvron

[mahjqa]

For best results, I'd recommend two XL motors per battery box.

Your weight question is irrelevant. Negating friction for a moment, if you gear down a motor to half the speed, it will be twice as strong. That being said, XL motors are pretty damn strong to begin with.

[DLuders]

@ dandexter: There are a lot of answers to 27 "Frequently Asked Questions (FAQs) on the official Lego Power Functions website http://powerfunctions.lego.com/en-us/faq/default.aspx :

"Q2: "How many Power Functions Motors can I drive from one Power Functions Battery Box?"

A2: "As a rule of thumb, you can drive 2 Power Functions XL-Motors, 3 Power Functions Train Motors or 4 Power Functions M-Motors at the same time from one Power Functions Battery Box. If you wish to run a combination of motors, you can e.g. have 1 XL and 2 M running together. The XL-Motor requires about twice as much power as the M-Motor. The Battery Boxes and the IR Receiver have overload protection, so attempting to drive too many motors will not damage anything. The power a motor consumes depends on what function the motor is performing. Motors will operate best when driving a small load."

If you are making a Lego Technic vehicle, you may find Nico71's TTools useful: "TTools is a simple web software which calculates some usefull data for TruckTrial and Lego vehicles....

* Calculate ratio, speed (empty or in charge), torque (in charge or stalled), electrical and mechanical power, power lost

* Type of motors, battery and gears are managed

* Efficiency of motor(s) and drivetrain are managed, including worm gear and knob (available torque is reduced by the worm or knob gears)

* Calculate clearing abilities data (angle of approach, departure and clearance)."

[timslegos]

I usually only use i battery box with my MOCs(which usually use all 4 receivers). As long as you don't run all the motors at once it is fine. i have used 2 or 3 m motors at once though. I would say no more than 2 xls.

tim

[dandexter]

Thanks for all the help guys, you've been very helpful.

I am current designing a large project here, and I have decided to motorize it.

http://www.eurobricks.com/forum/index.php?showtopic=66885

I have 5 XL PF motors driving it, one for each wheel line on the truck (not geared down or up, 1:1 ratio). Two M PF motors, one for steering (geared down, mainly so it moves/steers slow enough) and the other for lifting up the tipping part.

The calculator came out with.

Uploaded with ImageShack.us

Edited March 2, 2012 by dandexter

[timslegos]

Wow that is a huge truck! i think the largest i have ever seen. Well i think you will find you will need more than 1 xl for tipper raising.

tim

[dandexter]

Wow that is a huge truck! i think the largest i have ever seen. Well i think you will find you will need more than 1 xl for tipper raising.

tim

Thanks, I was hoping to get away with only 1 Medium PF motor for the tipper. But I'm not too concerned, i'll use whatever works. I will figure out the tipping part when I build it as its too hard in LDD. It can't handle rotating such a large amount of pieces.

Does anyone know if those numbers the calculator gave me should move the truck? Or will I need to change the gears to get more torque etc?

I know I have calculated this stuff back in High School, but its been a few years now and I can't remember.

[DLuders]

You could see Sariel's Gears Tutorial for some tips, then use Sariel's Gear Ratio Calculator.