---
title: Drill Motor
tags: obsoletemotor
---

{% include outdated-warning %}

_This entry describes the drill motors included in the 2003 and 2004 [kit of parts](kit-of-parts). Earlier drill motors had a smaller shaft and were not as powerful._

## _Drill (Skill Bosch) Motor_

Stall current: | 127 amps
Stall torque: | 7.70 in-lb
Max power: | 376 watts
Free speed: | 19,670 rpm

Two drill motors and gearboxes were included with every [kit of parts](kit-of-parts). The drill motor, along with the [CIM motor](cim-motor), are the two most powerful motors included by a significant margin. One of the two basic [skid steer](skid-steer) [drive trains](drive-train) included in the [kit of parts](kit-of-parts) utilizes one drill motor on each side of the [robot](robot).

## Included gearbox

The drill motor is provided with the accompanying gearbox in the portable drill that the motor comes from. It is a [planetary gearbox](planetary-gearbox) with two gears with ratios of _ratio here_ and _here_. The gearbox has a torque limiting clutch that can be set to disengage the gearbox from its output shaft at a certain torque. Additionally, the gearbox has two small pins that stop backdrive on the motor, but they can easily be removed.

## Usage Notes

- Many teams use the Drill motors on their [drive train](drive-train) because of its high power output, easy to use mounts, and accompanying gearbox that provides a large enough reduction.
- If the drill gearbox's torque limiter is used (not set to "drill"), robots may have jerky control, making it very difficult to drive. After a little practice, switching over to direct drive could be the solution. It risks burning out your motor if it stalls, but makes it much easier to control.