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I spent 20 years with “bone-on-bone” in my right knee, got a replacement, and was able to live again! As a professional firefighter, my life was misery until that replacement, and afterwards I was a new man. Before, everyone waited for me to catch up, and now they have to try and keep up...

Looks great Ray, and I’m on pins and needles waiting for the first “pop”!!! John W

I wonder if someone at the top is concerned about a virus impacting our satnav system in time of war…

Welcome aboard! Our interests are similar, and I’m just down the road a piece in Camp Verde! John W

I sent you a message, take a look at your in box. John W

As many of my plans call for a DP sizing, Mod cutters usually don’t cross close enough to fit those plans. However, I have a decent app called Gear Lab on my iPad and it does allow for conversion of a sort, and even gives me adjusted center to center axle distances if I need to make that change...

Excellent thoughts. I have an Enco 10X18 (metric of course), a 13X39 Combo machine (also metric), and my trusty Atlas Clausing 12X36. Comparing these three against my gear needs for say Phillip Duclos “Odds and Ends” engine (32dp), that’s a wide ranging set of prospects! Thanks for the insight...

Not a bad option, it looks like an application by application purchase. Thanks Steve! John W

Excellent example Charles, thank you! I have some more thinking to do, that’s for sure. John W

I’m a new kid when it comes to cutting gears, and short of trying to make my own single point cutter, I thought I’d bite the bullet and buy a set of involute cutters. My question to the group, from a model engineering standpoint, which DP set makes the most sense and provides the best range for...

Looks great Ray, and nice tip on the form-a-gasket too. I’ve been considering a similar operation and wondered about the water seal around the liner. Thanks! John W

That’s a really unique updraft intake system! Twin rotary valves? I’m far from expert in areas of model airplane/boat/tether car engines, but that has to be quite different from the usual system. Thanks for sharing, John w

For the lathe, I use a 4 jaw chuck and dial in the bore with a dti. On the mill. I center using a coaxial indicator and either a boring head or an expanding reamer if the bore is already close, and if threading, using the appropriate tap with tap starter in an R8 collet. Good luck, and accurate...

That’s a great scale! Will the pump move water when completed? Is there a water jacket for the “cold” end? Nice engine, congratulations on a good runner! John W

Very nice, thanks for sharing! John W

Loose collet or not, that’s a mighty good looking test piece!!! Nice work, John W

Here’s a link to the 3d engine I printed. All thanks to the original poster! https://www.thingiverse.com/thing:4322206 A bit of post processing to ensure a decent seal in the valve, piston, cross head, and (lack of?) stuffing box, as well as free rotation of those parts. I used a tiny bit of...

Perhaps we can collaborate on some of the printed parts for the geared engine, or maybe a group project?

I love the experimentation approach Pete! Takes me back to my early motorcycle racing days before there were “bolt on” accessories, especially for 2 strokes. John W

Thanks to everyone, I’ll get to work! John W