Micro Motors Operation and Maintenance Instructions

A. AIR FITTINGS                                                                         

1. Series MMF Air Motors and Series MMD Air Drills

These right-hand rotation models have a 1/8” NPT Air Inlet into which a 1/4” O.D. instant tubing fitting is installed*. Exhaust air is muffled and directed rearward through two exhaust holes.

* Note: On some models, due to packaging constraints, the instant tubing fitting has not been installed. Use an adjustable wrench or a 7/16” open end wrench to install. Note that since the fitting has pre-applied pipe thread sealant, Teflon tape is not necessary. Hold the air motor using the wrench flats at the rear of the motor.  Do not use pliers or similar tools on the air motor outer diameter.

2. Series MMR Air Motors and Series MMDR Air Drills
These reversible models have 1/16” NPT Air Inlet and Outlet ports into which 1/4” O. D. instant tubing fittings are installed*. Either port may be selected as an inlet with the remaining port becoming the exhaust. Utilizing the port marked with the “R” as an air inlet will provide left-hand rotation and approximately 20% less performance than the forward specifications.

* Note: On some models, due to packaging constraints, the instant tubing fittings have not been installed. Use the supplied 3 mm hex key to install the fittings. Note that since the fittings have pre-applied pipe thread sealant, Teflon tape is not necessary. Hold the air motor using the wrench flats at the rear of the motor. Do not use pliers or similar tools on the air motor outer diameter.

It is recommended that you use the ¼” O.D. fitting(s) provided for the inlet line (and exhaust line). Do not use any tubing having an I.D. smaller than 3/16” for the exhaust line, as that will create back pressure that will decrease performance.

To carry the exhaust air away from the operator or the immediate work area, attach a short length of tubing to the exhaust port fitting.

3. Use of “instant” tubing fittings
These fittings are designed to be used with ¼” O.D. nylon or other similar hard plastic tubing. The tubing ends should be cut clean and square. To install the tubing, simply push it into the fitting as far as it will go, then pull on the tubing to be certain it is secure. To remove the tubing, first press down on the release ring (press towards the motor), then, while holding the ring down, pull the tubing out.

B. MOUNTING

Flange Mounted
The Air Motor/Drill may be mounted using the mounting flange provided. The flange comes with two holes, each spaced .560” from the centerline of the shaft, which are sized to accept #8 screws. The mounting flange is made to be attached to the Air Motor/Drill by utilizing the 5/8 – 32 left hand threads on both pieces. Locktite # 271 is recommended for securing the mounting flange to the Air Motor/Drill.

Thread mounted
The Air Motor/Drill may be mounted directly by utilizing the 5/8 – 32 left-handed (reverse) thread on the motor and an equivalent thread in your mating part. During mounting, hold the air motor using the wrench flats on the motor. Do not use pliers or similar tools on the air motor outer diameter.

C. AIR SUPPLY

Clean filtered air is essential for proper performance and long product life. Although compressed air is the most commonly used power source, inert gases such as nitrogen are also suitable. (Caution: Exhausting an inert gas, such as nitrogen, in the direct vicinity of the operator can present an asphyxiation hazard. Use care in locating the exhaust line and insure adequate ventilation at all times.) An air filter NO LARGER THAN 50 MICRONS must be installed in the air line near the Air Motor/Drill and just before any in-line lubricator.

FAILURE TO USE AN AIR FILTER MAY ALLOW DEBRIS TO ENTER THE AIR MOTOR OR AIR DRILL AND CAUSE IT TO PERFORM
IMPROPERLY OR CAUSE IT TO FAIL.

The free speeds of the Air Motors/Drills were obtained at the optimal pressure of 90 PSI. At this pressure, air consumption is approximately4.8 CFM. Decreasing the air pressure from 90 PSI will reduce speed, air consumption and torque. The Air Motor/Drill may also be operated safely at pressures up to 160 PSI and most models may be repetitively stalled* without harm.

* Caution: The gearboxes on these motors have a maximum allowable torque of 1750 in-oz (9 ft-lbs.). Do not exceed this torque or the gearbox may be damaged (due to gear slippage). This is particularly important on -6001 and -5001 motors (7 RPM and 28 RPM) and on -0001 motors if used at over 85 PSI. You must use either a torque limiting device, lower air pressure or otherwise insure that the output shaft is never loaded in excess of 1750 in-oz.

D. LUBRICATION
Lubrication is required for all Air Motors/Drills. All Air Motors/Drills have been oiled before leaving the factory. This allows you to run the new motor briefly for test purposes but is not a substitute for regular lubrication. If your application requires “Lube Free” operation, this option must have been specified when ordering. “Lube Free” motors can be identified with the suffix “LF” at the end of the part number. The part number and serial number are engraved to the side of each motor.

FAILURE TO PROPERLY LUBRICATE THE AIR MOTOR/DRILL WILL CAUSE IT TO PERFORM IMPROPERLY OR CAUSE IT TO FAIL.
SUCH FAILURES ARE SPECIFICALLY NOT COVERED BY THE WARRANTY.

1. In-line Lubrication
In-line lubricators using AMFLO Air Tool Oil 1220 or an equivalent S.A.E. 10 Wt. Non-Detergent Oil are recommended for continuous and frequent duty applications. A rate of 3 -6 drops per minute is recommended for most applications. (Contact AMFLO for a distributor near you at (800) 330- 4062).

2. Manual Lubrication
Add 3-5 drops of Microlub (Micro Motors Part No. 27001) to the Inlet Port at the tube fitting, approximately every 6-8 hours of operation. The instant tubing fittings allow the tubing to be easily removed, without tools, when manual lubrication is needed. Note that Microlub is a much heavier oil than air tool oil and is designed to lubricate the motor for several hours of use. Do not use air tool oil as a substitute for Microlub when manual lubrication is selected.

3. Maintenance on “Lube Free” Motors
Where applications may have constraints that will not allow lubrication at the work site, the “Lube Free” option may be specified. It must be understood that the blades will wear faster than a lubricated motor, despite the self-lubricating blade material used. “Lube Free” motors are identified as such by the suffix “LF” on the part number. As a result of this “Lube Free” feature, the motor will need increased service to replace the blades as compared to the standard lubricated motor.

To run the “Lube Free” motor efficiently we recommend that the motor be occasionally cleaned as follows. Place 3-4 drops of Air Motor Cleaner (Micro Motors Part No. AMC1000) in the inlet port of the motor and run approximately 10 seconds to allow blade material to be flushed out. This cleaning process should be done, with minimal use, at least once a month or any time the motor becomes sluggish. Please note that the 90 Day Warranty does not include blade replacement.

E. COLLET OPERATION – AIR DRILLS

The Collet is designed to accept 1/8” shank drills, burs or mandrels. “Circuit Board Drills”, which are sold by most industrial supply houses, feature 1/8” shanks and are available in most standard fractional and number sizes. When installing a tool, place one of the supplied wrenches on the flats of the output shaft to prevent rotation while tightening or loosening the nut with the other wrench. Insert the tool fully into the Collet and TIGHTEN SECURELY. A 1/8” to 3/32” Collet Adapter (Micro Motors Part No. 2580) is available.

F. DRIVE SHAFT – AIR MOTORS

The drive shaft on the Air Motor comes with a flat side for easy mounting, using a set screw. Set screws must be tightened securely for safe operation.

PRODUCT WARRANTY

Series MMF and MMR Air Motors and MMD and MMDR Air Drills are warranted to be free from manufacturing defects in material and workmanship for a period of 90 DAYS from date of shipment.

This warranty applies only if the product has been operated in accordance with the enclosed instructions. This warranty is null and void if the product has been subjected to abuse or misuse, insufficiently lubricated, an air filter was not used as specified or if the motor has been opened and/or disassembled. The warranty does not apply to normal wear or blade wear on “Lube Free” motors. Sole liability, under this warranty, is limited to repair or replacement, at our option, of the product. No other warranties are expressed or implied.

For warranty or non-warranty repair of these products, return directly to Pro-Dex Micro Motors. Call: (949) 769-3200