MicronMOTIONEERING®: True Planetary Gearheads

GLOSSARY
Adapter Length "AD"

The length of RediMount input housing for any given motor.

Arc-Minute

1/60th of a degree.

Axial Load Capacity

The maximum load in the axial direction that a specific Gearhead can handle as a function of output speed.

Backlash

The lost motion on the output shaft of a gearhead, while fixing the input and applying a load in both directions.

Continuous Duty Continuous Operation

An application where the Gearhead is running for 4 hours or more, in one direction, without stopping or changing speed.

Continuous Torque Rating

The torque that a specific Gearhead can handle at a specific speed and calculated life (found in catalog).

Dual Shaft

An option in the DuraTRUE right angle product line with 2 output shafts making a "T" design.

DuraTRUE

Micron's most flexible product line with more ratios and output options than any other product.

Dwell

The time during the duty cycle where the load is at rest.

Efficiency

The measurement of lost power transmitted through the Gearhead.

Equivalent Torque

The solution for a torque requirement when using the "Exact Method" for Gearhead sizing.

EverTRUE

Micron's new continuous duty product line.

Exact Method

An accurate way of calculating the torque requirement of a Gearhead (see Micron catalog for details).

Face Gear

A gear whose teeth are cut on the "side" or "face" of the gear for increased load capacity and efficiency.

Gearhead Express

Micron's program that guarantees a 24 hour shipment on the most popular sizes and ratios.

General Method

A quick and simple way of calculating the torque requirement of a Gearhead (Tr = Tm x i x e) where "Tm" is the motor torque, "i" is the ratio and "e" is the efficiency of the Gearhead.

Helical Gearing

A gear with teeth cut on an angle to its direction of rotation referred to as the "helix" angle to increase load capacity and precision.

High Precision

Micron's description of a 8 arc-min max backlash product.

Hollow Shaft

An option in the DuraTRUE right angle product line with a hollow or thru bore on the output.

Hub

The input component that is tightened to hold the motor shaft in place.

Hybrid

A combination of planetary and parallel shaft spur passes making up a particular Gearhead. Not as strong as a True Planetary design.

In-line Gearhead

A gearhead with the output shaft and input shaft parallel.

Mean Input Speed

The RPM at the input of the Gearhead (usually motor RPM).

Intermediate Housing

The housing between the input and output housing.

Internal Gear

The gear that holds that pinion and planet gears and is usually fixed or part of the output housing, also referred to as a ring gear.

Modified Equivalent Torque

The Equivalent Torque divided by the "Q" factor which takes into account the number of cycles/hr.

NemaTRUE

Micron's lower cost solution, available in both english and metric frame sizes.

NemaTRUE Metric

An option on the NemaTRUE product for a metric front face and shaft.

NemaTRUE Plus

An option on the NemaTRUE product for a larger output shaft.

Output Shaft

The shaft on the output or "low speed" section of the Gearhead.

Output Speed

The speed at the output shaft of the Gearhead.

Parallel Shaft Gearing

A gearing system where the gears are on separate parallel axis with only one point of contact between them - Not as strong as a True Planetary design.

Peak Torque

Allowable momentary peak torque for emergency stop or heavy shock loading.

Pinion Gear

Also called "sun" gear, in a planetary orientation it rotates on same axis as motor shaft and transmits torque to the 3 planet gears.

Planet Gear

The 3 gears that rotate around the "sun" or "pinion" gear and transmit load to the Gearhead output shaft.

PowerTRUE

The gearing technology found in all Micron right angle Gearheads. It is constructed with a face gear and a pinion gear.

Q Factor

Referenced in a chart in the Micron catalog as a way a de-rating the Equivalent torque to take into account the number of cycles/hr.

Radial Load Capacity

The maximum load in the radial direction that a specific Gearhead can handle as a function of output speed and the location of the load on the shaft.

RediMount System

Micron's innovative mounting system whose modular design allows easy and error free mounting to any motor.

Right Angle Gearhead

A gearhead with the output and input shaft perpendicular.

Ring Gear

The gear that holds that pinion and planet gears and is usually fixed or part of the output housing, also referred to as an internal gear.

Self Relubrication

The ability of a section of gearing to recirculate its lubrication for longer life - This occurs in a planetary gear pass.

Sleeve

The aluminum bushing that fits between to the motor shaft and the input hub of the Gearhead.

Spur Gear

A gear with straight teeth cut on it's rim parallel to the axis of rotation.

Sun Gear

Also called "pinion" gear, in a planetary orientation it rotates on same axis as motor shaft and transmits torque to the 3 planet gears.

Tapered Roller Bearing

A bearing where the inner and outer races are segments of cones and the rollers are tapered for increased radial and axial load capacity.

Tapped Face

When the output of the motor or Gearhead has tapped holes on the face instead of thru holes. This is the standard output face for the Micron TRUE.

Torsional Stiffness

The "wind up" or lost motion in the Gearhead when applying a load on the output shaft and fixing the input.

True Planetary

A Micron Trademark meaning 100% planetary or that all in-line gear sections within the Gearhead are planetary with no parallel shaft spur gear passes.

Ultra Precision

Micron's description of a 4 arc-min max backlash product.

UltraTRUE

Micron's Helical Crowned True Planetary product line with the highest torque and performance for any given frame size.

ValueTRUE

Micron's new Helical Crowned True Planetary product line with a very competitive price.

XTRUE

Micron's newest and most economical product line.

Competitor Part Number

Enter Competitor model in order to get the equivalent Micron Gearhead.