Amazing! Your patience and determination were truly impressive, and your meticulous descriptions here (though I confess you lost me with some of the more technical engineering details) are a manual in themselves.
Do try this at home, folks!
Thank you so much for the effort and expertise you put into this, as a writer as well.

A fun read if one is interested in building such an apparatus. For me, I sincerely doubt even at a younger age would I care to take an interest. As the article says, there is no compassion or dictatorship of how long the spanking would take place. That would be up to the person (which is the builder) to decide. He/She decides his/her own fate in that matter.

Good article that took a lot of thought.

Interesting design. Have you developed it more?

Now that would be something I'd like to see on the market someday.

Many thanks for your careful description of your efforts.

You've adressed most of the main problems with a DIY spanking machine and produced it at not too great a cost. Well done.

I saw some spanking machines on the web, all of them both primitive and expensive. This one deserves a patent, but unfortunately it's costly.

A fascinating tale of your inventive process. You achieved a lot in a comparatively short time. But it sounds as if there ought to be an emergency stop switch if the person in the machine is alone; you would have suffered more than expected if your partner had not heard you.

Many thanks for all the comments. Am not sure where to respond to them so I shall try here in case the people return.

Flyboy asked if the has machine been further developed. The answer is no. It has been running for about 3 years and is as I left it. It works well, does its job and there has been no need to “automate” it. In fact it has been a long time since I have experienced it myself since my partner is better than the machine anyway.

As for patents suggested by Ordalie; I have no wish to make a living building or selling such machines. Instead I would just be happy if someone else though our design was worth investing time and money in to copy it and have some fun with.

Walmit suggests an emergency stop switch. In fact neither I nor any other person who has ever been in the machine has ever been in any danger. My partner has never and would never leave anyone alone in the machine. And as it stands today it is impossible to secure yourself in the machine without leaving a hand to free yourself if necessary. From a philosophical point of view at least an emergency stop switch is akin to a “safe word”. My partner and I use a safe word in play. If the machine were converted for use where the spankee is also the operator then there is a problem to solve. Is it worth providing an immediate “safety off switch” and losing some of experience of being unable to terminate the experience before a punishment is complete? I think it would be up to the individual builder/operator to decide for themselves.

Over the years I have given this some thought in my idle time. My own choice would be to have the restraints release after a certain expired time, independent of power, software or computer control. I fact the existing restraints have been designed so that they can be attached by means of ice bolts. Experiments have shown that under normal room temperature conditions when pegs made of ice are used to attach the restraints to the table, they will be released in just over 90 minutes. Of course 90 minutes in the machine when running could perhaps result in some unintended trauma however it would be unlikely to cause permanent injury. This would be a reasonable compromise to maintain the feeling of being at the mercy of an inhuman punishing device and that no amount of begging or pleading would induce the device to release you early from a pre-programmed punishment. A safety switch could destroy this fantasy.

I've written just one story featuring a spanking machine: in "Punch and Juicy", Mr Punch is captured by a Xena the Warrior Princess imitator who has a spanking machine for him, but she ends up on the receiving end. Plus one story about a machine that spanks (important difference). I don't find the idea of the spanking machine that exciting unless something goes wrong - for example, the machine is mobile and goes looking for unsuspecting spankees, or in a variant of that famous James Bond incident at the health club, someone nips in undetected and changes the settings. Hope that doean't worry you...

A fascinating engineering project, but as you acknowledge rather pointless unless one wanted an inaminate judicial machine. I have a story kicking about needing finishing that uses such a concept.

My congratulations on your work, and interesting (to me at least) description.

If more engineers were spankos then we would have more spanking machines. It takes a certain mindset and skills to breakdown the problem and solve it the way you did.

Well done.

When I was younger I thought about creating such a thing...then I switched.

Wow! Such a well detailed and engineered machine. A very useful building guide indeed, with very clear diagrams, for those talented enough to construct one. You are very clever for designing and building this practical machine for your wife as well as for providing such a helpful set of instructions for like-minded people.

I was a math/physics double major as an undergrad (and a spanko for life). I found this absolutely fascinating.....

Spanking machines played an important role in spanking law enforcement in the "near future" stories, so it's good to see a real one designed and in use. Very interesting article.

The problem I see with the design is that of hitting in only one spot all the time. I think I have a solution but it would require the use of leather rather than paddles and would have to involve double oval guides to work the strap around left and right and up and down. There is plenty area for spanking from the tailbone to mid-thigh and the spanking/strapping would enable a much longer duration as well as a much more thorough spanking. In my minds eye only, of course ... Great article at any rate.

A very well written up research project worthy of academic distinction with the possibility of commercial application. I can see the machine selling well on Amazon.

Did you look at the spanking machine developed by pain4fem.com? It's based on a skeet throwing machine.

The research you put into this machine is very impressive, as far as a safeword you could put a key board in front of the spankee and have them type in their safeword then wait for the computer to ask if you are sure you want to stop the punishment. To see if this works have your partner put you in the machine and start spanking you then try to type it would be fun to find out if it can be done.

It would be nice to post a set of specs as a starting point for the next version.

It would up patentable subject matter under US Code. Moreover, the 102(b) bar on patentability for inventions "I'm use, or on sale" more than one year prior to patent application would be another bar, if the subject matter bar could be overcome.

You've done a very nice piece of work on this project, particularly with regard to control of the paddle face speed and rate relative to a pain intensity grading system.
Do you think that commercial grade portable power tools which have considerable torque, variable speed and are relatively cheap would have helped you in the mid stage design?
I have a nicely equipped tool shed and began to make progress on what I thought would be a working machine using cams, escapement release and paddles whose central shaft was of stiff spring steel. Of course I never completed this as its' purpose was too obvious and I'd die of embarrassment if found. So, hats off to your courage as well!

You've done a very nice piece of work on this project, particularly with regard to control of the paddle face speed and rate relative to a pain intensity grading system.
Do you think that commercial grade portable power tools which have considerable torque, variable speed and are relatively cheap would have helped you in the mid stage design?
I have a nicely equipped tool shed and began to make progress on what I thought would be a working machine using cams, escapement release and paddles whose central shaft was of stiff spring steel. Of course I never completed this as its' purpose was too obvious and I'd die of embarrassment if found. So, hats off to your courage as well!

Thanks for an interesting article which stimulated some brain cells regarding physics learnt nearly 50 years ago, I can't say I could imagine ever preferring a machine but it must be quite a novelty experience and I am glad it has enhanced the experiences your partner can give her clients.

This seems quite brilliantly engineered

Hopefully your innovative enterprise will prove the old axiom is true: build a better mouse trap, fulfilling a legitimate need and the world will beat a path to your door. Just think of all the self spankers out there, who's needs your machine could help to satisfy..

Loved your story and the desire to build. A little over thirty years ago I built a spanking machine. Remember the old belt vibrators that shook your butt at 100 miles an hour (LOL)? I put a fiberglass rod on one and thank goodness I left my levies on to try it out. It hit soo hard and fast it was thirty seconds before I could gain the composure to pull the plug out and turn it off. I designed a strap for it and tried it bare, It was the spanking of my life in less than a minuet which left hard black burses the size of an orange that took three weeks to heal. I have had many ideas since then but never the time or privacy to try them out.