pic: In_CIM_erator

[Hawiian Cadder]

to eliminate all of the spec sheet madness from this, i decided on a simple test, today i made a small hub that pressed onto the axle of the 775 and had a .5 inch diameter, hooked the motor directly to a battery, and was able to prevent it from spinning with no problem at all. i did the exact same thing with a 555 and have a rather nasty burn on my thumb from trying to hold the motor and failing. the rs550 is significantly more powerful than the rs775 18 volt version that came in the KOP.

edit for clarification

i let both spin up to full speed, then attempted to stop them spinning by gradualy applying pressure to the outsides of the .5 drum. both motors were mounted to a block, and that block placed in a vice, and both were running off direct connection to battery with the same length of wire.

[kevin.li.rit]

Wouldn't looking at he motor constant (Rpm/V) values tell you that the motors perform differently and they are two different motors with he same package.

[kevin.li.rit]

Originally Posted by Hawiian Cadder

to eliminate all of the spec sheet madness from this, i decided on a simple test, today i made a small hub that pressed onto the axle of the 775 and had a .5 inch diameter, hooked the motor directly to a battery, and was able to prevent it from spinning with no problem at all. i did the exact same thing with a 555 and have a rather nasty burn on my thumb from trying to hold the motor and failing. the rs550 is significantly more powerful than the rs775 18 volt version that came in the KOP.

edit for clarification

i let both spin up to full speed, then attempted to stop them spinning by gradualy applying pressure to the outsides of the .5 drum. both motors were mounted to a block, and that block placed in a vice, and both were running off direct connection to battery with the same length of wire.

This isn't an accurate test of the motors power output but rather the stall torque.

[Chris is me]

Originally Posted by Coffeeism

This isn't an accurate test of the motors power output but rather the stall torque.

things such as free speed come into play too.

you're really going to refute manufacturer provided dynamometer specs with a thumb test?