Pro-dex Micro Motors, Inc. manufactures a line of high quality mini air motors and drills. Whether you are looking for high speed or high torque, their 3/4" diameter and compact profile make them ideal for squeezing into applications where space is at a premium. These small rotary-vane air motors can be instantly reversed, will withstand repeated and prolonged stalling and are well suited for use in contaminated and wet environments. These motors run cool even under continuous full load and their spark-free operation makes them a common choice for use in explosive applications.

Hundreds of thousands of these reliable motors are in use in robotic, medical and industrial applications around the world today with many of them still running smoothly after nearly 30 years of continuous use. Stainless steel and aluminum construction, precision ball bearings, a finely polished cylinder bore, high quality hardened gears and thorough testing of each unit ensure a rugged motor that runs smoothly and has a long service life. Different models have speeds ranging from 1 RPM to 40,000 RPM and torques ranging from 2.8 in-oz to 1200 in-oz. The slower speed units have rugged, built-in planetary gear boxes.

They should be operated on clean, filtered compressed air, nitrogen or other inert gases at up to 150 PSI, and their speed can be varied by changing the supply pressure or flow rate. Lubrication is required except for Lube Free models. Use an automatic inline-luber or periodic manual lubrication.

All units come with a removable mounting flange and "Drill" units also come with a precision .125" diameter collet. Other options include sealed output shafts and lube-free models. They can be ordered in a "Right Hand" version (one air fitting, rotates CCW as view from shaft end) or as a "Reversible" unit (with two air fittings, shaft rotates in either direction).

Note: "Right hand" versions have two small holes at the rear of the motor, on either side of the 1/8" NPT air inlet port. These smaller holes exhaust air from the motor. If exhaust can not be tolerated in the vicinity of the motor, then order the reversible version which has two 1/16" NPT ports. This allows exhaust to be piped away from the motor area. It also allows for use of a muffler for quiet operating environments. (Keep in mind that very long exhaust lines of small diameter may cause back pressure that can degrade performance.) If there is any doubt, we typically recommend the reversible MMR or MMDR versions for added flexibility at the same price.

Running a reversible motor with the port marked "F" as the inlet gives "right hand" rotation (CCW viewed from the shaft end). Running it with the port marked "R" as the inlet provides left hand rotation but gives approximately 20% less performance.

Porting for "right hand" versions MMF & MMD