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Ouch! That's just sad...

Rich Dosdall's incredible Oliver 1655 tractor is described here: https://craftsmanshipmuseum.com/artisan/richard-dosdall/richard-dosdalls-1-2-scale-oliver-tractor/ and Also in Model Engine Builder #39.

GreenTwin, is this Prusa XL your first 3D printer?

Since the topic has veered off into holding the wires, here's a shot of the thread wires in use. The two bottom wires are attached to the micrometer with the Flexbar holder. You set them on the threads first, then use your free hand to hold and set the remaining wire while closing the...

Can't wait to see what you make! Not much room in there at this scale. You might find this video interesting. It's on my 3 lifetime long build list. :) Look at one of his other videos to see it working.

Yeah, you definitely want to be able to kick the traction engine out of gear for stationary running of accessories. The Wilesco engines use a lever to slide one of the gears in the cluster in and out of engagement by sliding it on the shaft. Simple, but very effective. I can try to get some...

If you want to thread a 1/8" rod you use a 5-40 die. That's handy! It's also a nice size for model work and why you see this old thread size in old plans.

Nice work! While it's not going to be my next project, the Case tractor is definitely going into my build queue. Got Rudy's book and I've been saving online documentation and ideas locally. There's already some great build threads posted and your build is another I'll be watching closely. I...

Yes, after I've gotten a few models completed is when I really started to appreciate the workmanship involved in crafting the beautiful models on display at the show. These guys are really working at a high level.

If you haven't already attended, make you visit the Cabin Fever Expo at the Expo Center next year. It's very local for you and it's the biggest model engineering show on the east coast.

Yeah, it gets the job done for me.

Yes, you want to use fixtures to keep you taps and dies straight. A have a few for the lathe, but for the smaller sizes like #5-40 I use this holder: The die is held in the front and the fixture slides on a hollow shaft held in the tailstock. For power threading, you just hold the piece...

Maybe to late, but I wouldn't recommend buying cheap taps, especially small ones. The first time you snap one off in your work you will instantly regret it. https://www.zoro.com/widia-gtd-hand-tap-set-3-pc-hss-5-40-h2-limit-15212/i/G1723863/

Yes, the #5-40 thread is what you use with 1/8" rod. It's easy enough to buy tap & dies from decent suppliers and you can buy the fasteners from McM and other places as well. It's handy for model work, but It's doubtful your corner hardware will carry anything as that fastener size has falling...

You're missing my point, the DRO system should come from the factory with scales that are already much more accurate than .003" in the same way when you buy a digital caliper it arrives ready to use. The Easson GS30 scales that I installed on my mill have a worst case error of ±8μm over the...

From the factory, my mill DRO was right on the money compared to any standards I have in the shop. Are you sure you need to do this?

Your lathe is 70+ years old so you really need to pull the spindle and replace the spindle felts. When the spindle is out you can install a serpentine belt so you don't have to worry about a belt splice. My lathe is UMD so unfortunately that wasn't an option for me. The lathe spindle is far...

Oh, I was expecting to see a file as it's easier to follow the logic that way. Can you zip up and post the Freecad file? You can't post the raw Freecad files here, but it works fine in an archive.

As he showed in the video, Freecad fillets are very brittle and tend to break with complex objects when edges meet at odd angles. This was a way around that. Freecad uses a 3rd party 3D kernel, Open CASCADE Technology (OCCT), so sometimes it's difficult for the developers to fix or work around...

This was some good stuff in Freecad! Thanks for the example and commentary.