OSSM - Open Source Sex Machine

OSSM (pronounced like "Awesome") is a user friendly every day sex machine for the people.

This project aims to help people curious about sex machines explore their interest. A second objective is optionally learning how mechanics, electronics, physics and computing are involved in your sexual pleasure.

Please note that this is a work in progress and we have attempted to keep compatibility with the current BOM going forward, but it's not guaranteed.

Primary design goals:

• Compact
• Quiet
• Moderate cost
• 3D printable (no cutting/machining)
• High performance, flexible
• Easily sourced components
• Doesn't look like a giant machine

Getting Started

There are a few hardware flavours to choose from, we've included user modified versions in case that fits your use case better!

Build Instructions

Join our Discord to be part of the discussion and get help with your build. https://discord.gg/MmpT9xE

Software

We recommend using the ESP32 microcontroller. This code is still arduino IDE compatible but offers many times better performance and a nice internet dashboard you can use! Control your OSSM at https://app.researchanddesire.com/ossm !

Eagle PCB

Simple PCB to power an ESP32 (wifi enabled microcontroller) from 24V and breakout the pins for the OSSM control

Mechanical design

The OSSM use a compact belt design with components that have become widely available due to 3D printing popularity. It is driven by a Nema23 motor of your choosing, although we reccomend small integrated closed loop steppers for their cost to performance ratio.

Bill Of Materials

We are calling this the reference build, when deviating from it please check compatability with existing BOM

1. 3D Printed Parts
   • This has recently had significant changes
   • Make sure to choose one of the options for the toy adapters
   • Mounting options are still something that need to be worked on
   • Thank you @Elims for the belt tensioner design ( https://github.com/theelims/FuckIO )
2. NEMA23 Servo with 8mm shaft : Amazon.ca | JMC
   • Avoid the StepperOnline version until we can further test
   • Make sure you get something with 8mm shaft max!
   • There are 3 sizes of this motor -100W,140W,180W. If you are using the 140W or180W version it is recommended to use a 10mm wide belt and pulley (see the next two items)
   • search around for the best deal for you - have found occasionally better deals on Aliexpress
   • Force Calculator for OSSM
3. GT2 Pulley 8mm Bore 20 Tooth : Amazon.ca
4. GT2 Timing Belt : Amazon.ca

• Only the GT2 belt is needed from this kit, however it's often cheaper with the incorrect sized pulleys in a bundle
• Your desired stroke length plus about 200mm should be your minimum order length

5. Bearings 5x11x4mm : Amazon.ca

6. MGN12H Rail and bearing : Amazon.ca

   • Minimum 250mm in length
   • Must be MGN12H rail

7. Power Supply : Amazon.ca

   • Recommended specifications; 24v 4A
   • Ensure the power supply is fully enclosed (like a laptop power supply)
   • Ensure the power supply has the correct approvals for your location 8)Metric Cap Screws : Amazon.ca
   • A kit like this will provide what's needed, specific quantities TBD

8. ESP32 Development Board

   • An official OSSM reference PCB
   • We do not currently have a best suggestion if you are not using a reference board, most generic development boards are the same
   • We have found that the 3.3v boards may miss steps at high speed, so please use a level shifter as well.
   • To start working on the project, something like this Adafruit board is an excellent place to start.
   • Accessories required for prototyping include Breadboard and Dupont Jumpers

Wiring Notes

This should be a good start for the wiring of your OSSM! However, depending on your hardware mix settings or wiring may be different

Servo Wiring

Stepper Wiring