SRT100 actuators

The SRT100 actuators are based on stepper motors. Accurate and powerfull, they allow to build a 2DOF (2 actuators, pitch/roll) or 3DOF sim motion rig (3 or 4 actuators, pitch/roll/heave) for approximately 300€/actuator.

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Summary :

1. Presentation
2. Caracteristics
3. Shopping list

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1) Presentation

The SRT100 actuator is simlar to the OpenSFX100 actuator, of which it shares an important part of the components. The main difference lies in the motors used : stepper motors for the SRT100, servo motors for the OpenSFX (more powerfull, but also more expensive).

The motor is fixed to the ballscrew, The ball screw nut is linked to a 30mm wide shaft.

2) Caracteristics

The SRT100 travel is around 150mm. Each actuator supports more than 75kg. Beyond that, the speed will be reduced. The Arduino board controls 3, 4 or 4 actuators, thought the FlyPT mover software (free).

SRT100 or SRT150 ? It depends on the type of race you are in and the angles you want to reach. Personally, I have much more angle on my simulator than most simulators I see. For this reason, I prefer the SRT150. But to exploit this travel, you need more speed and therefore more power. This is a good setup if you use 4 actuators. For your information, the further apart the actuators are, the less travel you will have.

3) Shopping list

The full and detailled and updated shopping list is available here.

Electronic :

1. Arduino Uno (Amazon, Aliexpress)
2. Cables 3cores 22awg (outer diameter is 4mm). Each driver is linked to the Arduino by 3 wires (pulse, direction, ground).  So you can use 3 wires for each driver, or a 12 leads cable coming from the Arduino, that you then split in four groups of 3 wires (for 4 actuators). It is interesting if the Arduino is far from the drivers.
3. Power supply 72V 20A (Aliexpress)

MECHANICS :

1. Mechanical kit for SRT100/150 actuators : Industry&CNC, partner of Lebois Racing, offer a complete kit for the SRT100 and SRT150 actuators, that includes : SFU1610 300mm or 350mm ballscrew, FK12 bearing, 300x30mm or 350×30 shaft, LMEK30UU linear bearing, 40x30mm 14mm-10mm shaft coupler. Each actuator requires one set. The price is good, and each component has been tested.
2. 1 extrusion 100100 250mm ou 300mm Kinetics. It is the only compatible model.
3. Reduction sleeve RH10/M8, self-tapping

Motors :

Nema 34 motor, 12Nm, closed loop and a HBS86H (Ebay)

Screws (one set per actuator):

• 8 x M8 x 50 (Amazon, Aliexpress) :  To fix the linear bearing support and the fixed bearing support to the Kinetics extrusion.
• 4 x M6 x 90 (Vis Express, Aliexpress) :  To fix the motor to the Kinetic extrusion
• 4 x M6 x 25 (Aliexpress) : To fix the linear bearing
• 4 x M4 x 25 (Aliexpress) : To fix the fixed bearing
• 6 x M5 x 20 (Aliexpress) : To fix the slider