After watching a program on TV which mentioned the use of machines for sex, my partner and I felt that it would be a cool thing to try out.
The only down side being that these machines seemed to only be available in the US and at a hefty price tag. Even though the exchange rate is almost 2 to 1, taking shipping, import duties and voltage differences we were looking at well over £500 - probably more like £800 for the model we wanted.
So, I've designed and built my own. Its a simple rotary to linear motion action powered from a 12v motor and gearbox to provide up to 200rpm at about 30lb torque.
The speed is controlled remotely and power is provided by a small onboard 12v battery but the machine is small enough and portable to run from a 12v car cigarette lighter. Onboard battery should last for a good hour or so if not more.
The forward and back motion (translation) can be adjusted from 1" to 6" depending on mood and comfort level.
Version 1 is a mix of wood and metal but I have a friend making metal parts from wood templates for version 2.
First major trial is this weekend. :) :)