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I have set up Octoprint on my printer and will never look back. I can do a complete job of controlling my printer through a web browser -- which is immune to Windows 10/11 issues (when they issue the required update, which eventually they will). It makes it trivial to control my printer. I...

The shop wisdom of Philip Duclos has an article on spinning brass to make an oil can. I did spinning when I was in high school. As I recall, I wasn't very successful. Carl

Bob Shores suggests to make rings from the same bit of cast iron as the piston. It starts with the diameter .003 oversize, and ring grooves cut .003 "deeper than specified". I don't think that is describing the depth of the ring groove to be .003 less than the ID of the compressed ring, but...

The thing that stackerjack has likely missed is that the balls are free to move at a different velocity from either the inner or outer races. The velocity of the center of mass of the ball will be just the right velocity needed to provide rolling contact. For the flat plane case, with the...

Boston museum of science has a cutaway R4360. It's a beautiful piece of engineering art. I could look at it for hours (but not so my wife....) If you want to see the real thing, that's one place to go. Carl

I really love Onshape. Web-based, files in the cloud (a negative), but pretty full-featured and easy to use. They have a commercial model, so it's not just some hobbyists volunteering their spare time. It's free to use, as long as you are willing to make your work public (which is not a...

After spending a bunch of time looking at these tools, I wondered about making an electronically controlled version rather than an electromechanically controlled one. Commercial products I found ranged from 500W to 2500W. This is a lot more than the 25W you have found in hour system. 25W is...

I'm in Utah, USA

I recently figured out a setup on my Sanford surface grinder that makes it trivial to grind grooving tools. Send me a blank, and I'll make the tool and send it back to you. PM if interested. Carl

Looks like DesignSpark only creates STEP/IGES files if you buy the paid Exchange add-on module, which goes for the low price of $558! But DesignSpark Mechanical is free, so I could open the files in DesignSpark if I wanted to. The STL files would be nice. I'll send you a PM. THanks, Carl

Don, Do you have any files available for the final gun? Carl

Here's a step file of the Kerzel:

There are also free plans available for the J&E Junior hit and miss engine, which has a 2 inch bore and a 2.5 inch stroke. http://www.baemclub.com/pages/jandejunior.html I have taken the multiple individual files that were downloaded, and will be happy to share a combined pdf file, if anyone...

Onshape is a free, web-based 3D modeling system. http://onshape.com It can import and export STEP files, but I haven't played much with the STEP file exchange. Carl

I have copy of the Kerzel in Onshape, if you are interested. Carl

I believe it is Borax powder, not Boron powder, that is referemoved. Borax powder is a flux. Borax is readily available as a cleaning product, at least in the US. Carl

Mercury discharge lamps have spectral lines at 405 and 385 nm. 405 is a standard wavelength for photosensitive resins an home printers. 385 is a standard wavelength for laser-based sla printers. Carl

The book "A History of Machine Tools 1700-1910", by W Steeds, is available online for about $40 or £40 from various sellers. Carl

I believe it says B. Terry Aspin under the title. According to Google, Terry is the author of three books on home shop metalwork. I've not read any of them.

ISO has a specification for the dimensions and the dimensioning practice for countersunk screws. ISO 15065. The CAD systems I work with automatically create both the numerical dimensions and the dimensioning practice in conformance with the standards. Carl