Repeat Robotics Scalar Antweight combat robot Weapon pulley single

Repeat Robotics Scalar Antweight combat robot EMAX Weapon motor

Repeat Robotics Scalar Antweight combat robot EMAX Weapon motor diagonal

Repeat Robotics Scalar Antweight combat robot Weapon pulley pair

Product Documents

CAD Files

18T-3M-05 Pulley *.STEP File

Repeat Robotics Scalar Weapon Pulley

Name: Repeat Robotics Scalar Weapon Pulley
SKU: rr-scalr-weapon-pulley
Availability: InStock

DESIGNED TO MAKE BELT DRIVE ANTWEIGHTS A BREEZE!

The Scalar weapon pulley keeps your belt-drive antweight weapon running smoothly and easy to service. Specifically designed for the Repeat Robotics Scalar combat robot weapon system, this aluminum pulley can be used in a variety of combat robotics designs. The pulley fits HTD3M and S3M belts up to 5mm wide and mounts to a 5mm outrunner shaft with a prop nut. Includes 2×M3 setscrews to lock the pulley in place in addition to the prop nut. Its light weight (about 3.5g) allows you to spend your weight budget on more important things.

$6.00

3 in stock (can be backordered)

SKU: rr-scalr-weapon-pulley Category: Mechanicals Tag: scalar_maint Brand: Repeat Robotics

Repeat Robotics Scalar Weapon Shaft Repeat Robotics Scalar Antweight Weapon Motor

BUILT FOR RELIABLE BELT-DRIVEN WEAPONS

The Scalar weapon pulley is a lightweight, purpose-built solution for running belt-driven antweight weapons with smooth power delivery and easy serviceability. Designed specifically for the Repeat Robotics Scalar combat robot weapon system, this pulley also works well in a wide range of custom combat robotics designs that use standard 3mm pitch timing belts.

DESIGNED FOR COMMON BELT STANDARDS

This pulley is compatible with both HTD3M and S3M timing belts up to 5mm wide, making it easy to source replacement belts or tune your drive ratio without locking yourself into a proprietary system. The tooth profile is optimized for consistent engagement under load, helping reduce belt skipping during aggressive weapon hits. The Scalar kit uses the 267-3M-05 weapon belt.

SECURE MOUNTING ON 5MM OUTRUNNER SHAFTS

The pulley mounts directly to a 5mm outrunner motor shaft using a standard prop nut, providing axial retention during operation. In addition, the pulley includes 2×M3 setscrews that clamp onto the shaft to prevent rotational slip. This dual-retention approach improves reliability in high-shock environments typical of antweight combat. The Scalar weapon system uses the Repeat Ant Belt Drive 2305 (2400KV) as the weapon motor.

LIGHTWEIGHT ALUMINUM CONSTRUCTION

Machined from aluminum, the Scalar weapon pulley weighs approximately 3.5g, helping you preserve valuable weight budget for armor, motors, or electronics. The rigid metal construction maintains tooth geometry under load while avoiding the flex and wear issues sometimes seen with printed pulleys.

IDEAL FOR MODULAR AND SERVICEABLE BUILDS

Whether you are building a stock Scalar configuration or designing a custom antweight weapon system, this pulley is intended to make belt-driven layouts easier to assemble, tune, and maintain. Its compatibility with common belts and straightforward mounting hardware make weapon swaps and repairs faster between matches.

Safety Warning:

This component is part of a spinning weapon system. Always engage a weapon lock and operate the assembled robot only within a secure arena or test box. Never spin up a weapon in an unsecured area.

ItGresa Combat Robotics Safety Guide

Features

Purpose-built Scalar weapon pulley for belt-driven antweight weapons
Compatible with HTD3M and S3M timing belts
Supports belt widths up to 5mm
Mounts securely to 5mm outrunner motor shafts
Dual retention using prop nut and M3 set screws
Lightweight aluminum construction at approximately 3.5g
Improves serviceability and tuning of weapon drive systems

Scalar Weapon Pulley Specifications

Specification	Details
Diameter	0.77in (19.0mm)
Height	0.26in (6.5mm)
Weight	~3.5g
Designator	18T-3M-05
Material	Aluminum
Pulley Tooth Count	18T
Belt Compatibility	HTD3M, S3M
Maximum Belt Width	5mm
Shaft Interface	5mm motor shaft (outrunner)
Mounting Method	Prop nut and dual set screws
Set Screws Included	2×M3
Application	Weapon pulley for the Repeat Robotics Scalar antweight belt-driven weapon system

Frequently Asked Questions

What belts work with this pulley?

This pulley is compatible with both HTD3M and S3M timing belts up to 5mm wide. The Scalar combat robot kit uses the 267-3M-05 belt. HTD3M and S3M belts share the same tooth pitch and are generally interchangeable — just make sure the belt width is 5mm or less.

Will this pulley fit my motor shaft?

The pulley is designed for a 5mm outrunner motor shaft, which is standard for most 22xx and 23xx class brushless motors used in antweight weapon systems. The Repeat Ant Belt Drive 2305 (2400KV) used in the Scalar is a 5mm shaft motor.

How tight should I torque the set screws?

Snug is sufficient — M3 set screws are small and can strip if overtorqued. Use a properly fitting hex key and tighten until firm. Apply a small amount of blue Loctite (242) to prevent them from backing out under vibration. Check them after your first few runs.

Can I use this pulley in my own custom design?

Yes — the pulley is compatible with any design that uses a 5mm motor shaft and HTD3M or S3M belts up to 5mm wide. Verify the tooth count (18T) and center-to-center spacing work for your geometry before committing to a design. CAD files for the Scalar weapon system are available from Repeat Robotics.

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