Offset Line Motor Support -0.5mm

Millimetre Precision: Inline Mount with -0.5 mm Offset Printed in Carbon

The Offset Line Motor Support -0.5 mm (ref. SRP00785) from 3dsrp is a mount manufactured using 3D printing by fused deposition modelling (FDM) with carbon filament, providing notable rigidity and a lightweight design. Its inline configuration positions the motor parallel to the car's longitudinal axis — that is, perpendicular to the rear axle — a layout that promotes a lower centre of gravity and a more balanced mass distribution on the track.

Main Features

• Inline Configuration: motor aligned with the longitudinal axis of the chassis, perpendicular to the rear axle.
• -0.5 mm Offset: precise displacement allowing for more accurate adjustment of the pinion and crown gear relationship.
• Material: FDM printing with carbon filament, durable and lightweight.
• Compatibility with Bearings: accommodates single-lip bearings (it is recommended to glue them for secure fitting).

Function and Performance

The -0.5 mm offset is not a minor detail: in slot preparation, tenths of a millimetre in the motor shaft can make the difference between smooth engagement and one with excessive play or tension. This mount allows for correction of small factory deviations or adaptation of the motor-transmission assembly to setups that require slightly offset positioning relative to the neutral axis.

The rigidity of the printed carbon prevents flexing that could alter the geometry of the drive train during the race, maintaining a constant distance between the pinion and crown gear even under load.

Assembly and Preparation

The assembly process is straightforward, although it is advisable to consider some recommendations to make the most of this mount:

1. Select single-lip bearings or bushings with the appropriate dimensions for your motor.
2. Apply a small amount of adhesive to secure the bearings in the mount's housings before installing the assembly in the chassis.
3. Check the engagement with the crown gear before closing the chassis: the -0.5 mm offset should compensate for the geometry of your specific setup.
4. Ensure there is no rubbing between the motor and the walls of the mount once secured.

Ideal for…

This mount is aimed at preparers and club racers working with custom chassis or needing to correct motor positioning in inline setups. It is particularly useful when the standard mount does not provide optimal engagement with the chosen crown gear or when a millimetric correction in the transmission is sought.

Considerations

As a 3D-printed part, tolerances may vary slightly between units. It is recommended to verify the fit before the final gluing of the bearings. The indicated offset (-0.5 mm) is fixed, so it is advisable to confirm that it is the value needed for your setup before installation.

Frequently Asked Questions

What is the difference between an inline mount and a sidewinder?

In an inline configuration, the motor is positioned in line with the car's longitudinal axis, perpendicular to the rear axle, which lowers the centre of gravity. In a sidewinder, the motor runs parallel to the rear axle, transversely. These are different arrangements with distinct handling characteristics.

What is the purpose of the -0.5 mm offset?

The offset displaces the motor shaft -0.5 mm from the neutral position. This allows for precise adjustment of the engagement between the pinion and crown gear, correcting small deviations or adapting the assembly to transmissions that require that specific displacement.

Is it compatible with any inline motor?

The mount is designed for motors in inline configuration. Check the dimensions of the motor housing and bearings before purchasing, as the manufacturer does not specify specific compatibilities with certain motor models.

What type of bearings should I use?

The manufacturer recommends single-lip bearings or bushings. It is important to glue them in the housings to ensure they do not move during use.

Does the part require any additional treatment after printing?

Generally, the FDM carbon parts from 3dsrp are ready to use, although it is always advisable to check that the housings do not have burrs before mounting the bearings.

The 3dsrp SRP00785 is a 3D-printed inline motor mount with a -0.5 mm offset, manufactured using FDM technology with carbon filament. Designed for slot car builders and club racers seeking precise motor positioning, it ensures stable pinion-to-crown mesh and reduced drive train play. Single-lip bearings are recommended and should be glued in place for optimal performance.