12 Turning the Crankshaft - PMR #5 Steam Engine - Metal Lathe Mill Combo
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- Опубликовано: 15 окт 2024
- In this episode I machine the crankshaft. This involves turning between centers on two axes - the crankshaft and the crank pin.
This includes my first use of a surface plate and more puzzlement about why my mill can't side-mill worth a dang.
The post-Xmas footage is taken with the GoPro that Santa brought me, and there are some focus issues here and there. I'll try and do better next time.
I've been given and old PMR #5 "Coke Bottle Steam Engine Kit. It came with many parts missing and we know it's old because they don't make them with the main castings in bronze anymore.
This series will document this rank amateur hobbyist's attempt to build this thing.
The kit is available at www.pmmodeleng... (not sponsored)
My machine is a 1998 Shoptask XMTC Gold lathe mill combo with LinuxCNC.
I am a hobbyist and maker and sometimes I sell what I make.
Tindie Store: www.tindie.com...
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Blog: redhunter.com
Twitter: / redhunterstore
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I just found your videos building this steam engine. I’m enjoying the build so far and am looking forward to the next video. I just started working in the machining trade. CNC Operator. Been a mechanic for the last 20 years. I enjoy this much more.
It's a great hobby, I hope you make a great career out of it. Check my channel page for a list of other channels to watch.
crank webs
That's it!
Where did you get your toolpost? Looks a nice item. I could do with a nicer one for my minilathe
Pewetools.de also similar available from China search for multifix toolpost. They come in different sizes, mine is size A. A mini lathe probably wants a smaller one AS, AA or AAA
@@thumperthoughts awesome, thank you :)
Those are a nice setup. I myself am using an OXA Aloris style one from Shars.
Interesting video thanks. I don't really understand why people bother with these CI castings for small crankshafts. For small crankshafts they seem more trouble than using steel bar stock. I guess if you didn't have access to a mill as well as a lathe then the casting might offer some benefit.
Both of the PMR kits I have built did the crankshafts this way. Us beginners don't know better and follow the instructions.
@@thumperthoughts The reason are more about cost and marketing. Giving you a cast part feels like you have some added value when you buy the kit but is actually it is harder to machine and comes out way less strong than using steel bar. Sorry, not trying to be negative about the kit. For sure using steel bar would be added expense and more material to remove.
Another method of making the crank is doing a built up crank
That's how my motorcycle crank is built, but this is a kit so I went with the original component.
I am enjoying your build and picking up a few tips. Thanks for posting this. I always like seeing how people overcome the problems of work holding. One suggestion if I may, if you ever do another one of these, when turning the crank pin, slide a pair of bushings down the main shaft on both sides and then put your turning blocks on. In that way you can remove the bending moment that you had on the crank in the setup that you used. When I am doing this sort of work, I always think of my part as being made of rubber and see if it is stable with pressures.
For those of you out there who also enjoy this sort of things, I can recommend two other channels. The fun thing is that they both built the same model steam engine, the PM Research Steam Engine #1, so you can compare their methods and skills. You can also judge the differences between a good hobby shop and a full blown machine shop.
Blondihacks, she is a skilled amateur . The videos start with this one: ruclips.net/video/WWOsDs_co_I/видео.html
Joe Pie, he is a professional. He starts on this one with this video. ruclips.net/video/uaV6Qr_Tqys/видео.html
Crank lobes?
Could be.....
Rod journal, crank throw and main journals.
@@kevinhillgrenjr2248 I always have trouble with names. I know what they do, and forget what they are called. People too!
Oddly enough, they are called "cranks".
That's it!
loose the tunes.........