NeveRest 20 Gearmotor (am-3102)

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Encoder cables are not included

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Price: $28.00

Stock Status: In Stock

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Product Usage Note:
We have received some feedback from a small number of customers regarding the durability of the gearbox on the NeveRest 20 Gearmotor. After some internal testing, as well as review of returned gearmotors, we have found that this particular gearbox is more susceptible to failure from shock loads as compared to the NeveRest 40. These sort of failures happen most commonly in high-shock applications such as flywheel shooters, as well as drive chassis. We recommend these gearmotors to be used in low shock-load applications such as intake rollers, internal conveyors, etc.

Product Overview:
The NeveRest 20 is a gearmotor with an attached encoder. The output shaft geometry and the gearbox housing diameter is similar to what FTC teams are familiar with. The shaft is 6mm dia and the gearbox housing is 37mm in diameter.

This gearmotor rotates in the opposite direction as the NeveRest 40 and NeveRest 60. This means that the encoder counts will be in the opposite direction.

The power cable which feeds into the black encoder housing has two powerpole connectors already crimped to the end of the cable.

FTC Legality:
According to the FIRST Tech Challenge Game Manual Part 1, Rule RE04 this is legal for the 2016-2017 FTC Game.

Encoder Cable options:
Encoder cables are not included with this motor, and are sold separately. We have two options:

(RECOMMENDED) am-2993 is a cable which has the white 4-pin connector on one end and 4 separate black connectors on the other. (This is the recommended cable for this motor as you can change the encoder counts by swapping your ChA and ChB wires)
am-2992 is a cable which has the white 4-pin connector for the encoder and also the black 4-pin connector for the HiTechnic and Modern Robotics motor controller.

Encoder:
There is an encoder mounted to the back side of this motor. It is a 7 pulse per revolution (ppr), hall effect encoder. Since the motor's gearbox has a 20:1 reduction, then the NeverRest 20 output shaft provides 140 ppr.

Working with the Encoders:

Specifications:
Physical Specs:

Overall Length: 131.6mm (5.18 in)
Maximum Diameter: 37mm (1.46 in)
Output Shaft size: 6mm (0.24 in) with 0.5mm deep flat
Weight: 0.762 pounds
Mounting Holes: M3 tapped holes, qty. 6, on a 31mm bolt circle (3.5mm depth MAX, beyond this can damage plate and stop motor)
Electrical Connection Geometry: 6-pin connector for motor power and encoder contact
Gear Material: Steel
Body Material: Steel with plastic encoder housing
Lubrication: Included with gearbox
Shaft Hardness: 45-50 Rockwell C (https://en.wikipedia.org/wiki/Rockwell_scale)
Wire Gauge: 18 AWG

Theoretical Performance Specs:

Gearbox Reduction: 20:1
Voltage: 12 volt DC
No Load Free Speed, at gearbox output shaft: 275-315 RPM
Gearbox Output Power: 14W
Stall Torque: 197 oz-in
Stall Current: 11.5A
Output counts per revolution of Output Shaft (cpr): 560 Pulses

Performance Specs, mounted to AndyMark dyno: Coming Soon

Max Speed (under load of dyno):
No Load Current (under load of dyno):
Stall Current:
Stall Torque:
Max Output Power:
Time to Failure at Stall:
Motor Case Temperature at Failure:

Average Customer Review:

4 of 5 Total Reviews: 18 Write your own review!

0 of 0 people found the following review helpful:

NeverRest 20:1 Motor	December 22, 2016
Reviewer: Charlie Parker from Fort Worth, TX United States

We are using these as drive motors and they are much faster than the stock motors found in the kits from Tetrix.

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0 of 0 people found the following review helpful:

Great little motor, gearbox not so great	December 22, 2016
Reviewer: Anonymous Person from Saint Paul, MN United States

Great motor but we broke teeth of the gears after our second practice. Yes, we used it on our shooter! Before the warning came up on the Andymark site. :( We love the motor so we paired it with another design of gearbox

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0 of 0 people found the following review helpful:

Quickly delivered and exactly what was ordered.	December 14, 2016
Reviewer: Richard Courchesne from SAN ANTONIO, TX United States

AndyMark is drives our robots.

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1 of 1 people found the following review helpful:

Gearbox breaking	November 28, 2016
Reviewer: Anonymous Person from VA United States

Like others, we also have broken gearboxes and had to redesign our robot to accommodate completely different motors and gearing. The other NeveRest motors and gearboxes are solid and live up to their name, but this one is too fragile and should probably be discontinued.

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0 of 0 people found the following review helpful:

Motor is good, but the gearbox breaks	November 28, 2016
Reviewer: Anonymous Person

We use these gearboxes a lot; especially for our drive base and intake; however, the other day, while inspecting our robot, we found that out of four motors on our drivebase, two of them had broken gearboxes. We were planning on using these all season long, but now we cant really trust them

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