The NE was an inline spur gearhead. The new PV series gearhead is an inline planetary gearhead using straight-cut gears that provide higher torque, better accuracy, and longer life.

The NR was a right-angle spur gearhead. The new RX series gearhead is a right-angle planetary gearhead using helical gear technology that also provides higher torque, better accuracy, and longer life.

Both the PV series and RX series offer similar output face dimensions (shaft diameter and length, pilot diameter and depth, bolt circle and bolt hole) as a bolt on replacement.

The NE and NR series gearhead output direction depended upon the ratio of the gearhead whereas the PV and RX series directions are all the same regardless of the ratio. Reference the chart at the following link for more information on shaft rotation directions: Shaft Rotation

Legacy-GH-Crossref.xlsx

Reference the following link for a crossover from common standard NE/NR models to the PV/RX models:

Mounting Kits

The NE and NR gearheads mounting kits were a pinion only if a true Nema dimension motor (MM23-000, MM34-000, MM34-016 or MM42-000). All other mounting kits for other dimension motors included an adapter flange.  The pinion was tightened onto the motor shaft at a specific distance, to engage the first gear cluster within the gearhead.

The PV series Planetary Value line uses the MV mounting kits. The MV and MU mounting kits are similar in design.

The RX series Stealth Gen II use the MU mounting kits.  The RX uses universal mounting kits that are only an adapter flange and bushing. This allows the gearhead to be entirely built and the mounting kits use standard adapter flanges that are modified for the motor dimensions.

To find the appropriate mounting kit, use the motor manufacturer and model number with the web-base mounting kit search tool: Gearhead Mounting Kit Search Tool

Or if you have the MM mounting kit number, here's a crossover list:

MM_Replacements.pdf

Optional features

The NR series were typically purchased with single output shaft. The NR also had dual output shaft and encoder shaft options. These are standard options on the MultiDrive series gearhead but that is a metric dimension gearhead and starts in a 90mm size. This is quite different; we recommend a redesign to incorporate a newer gearhead.

Note the 3:1 for the NR series right-angle gearheads isn't a standard option on the RX series. The RX series has ratios starting at 5:1 going up to 100:1. The RB series MultiDrive gearhead is offered in a 3:1 ratio but is a metric dimension gearhead:

Stealth Gearhead "Right Angle" MultiDrive

For full specifications, see PV and RX series gearhead product pages.

Models affected:

NE23 NE34 NE42

NR23 NR34 NR42

8/23/17jh

12/13/18jj

8/621jh updated email