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让我们建立一个模型蒸汽机-加工活塞！
27 comments
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In the various machining knowledge i've kludged together over the years I haven't heard before that it's usually best practice to thread with the compound at a certain angle. I always just do it with the crossslide, but maybe that's why my threads aren't always the best 😉 What's the benefit of the compound method?
With you there on the eyesight issues, my steam engines are up to 4.5 inch to the foot size. ?
Fine work as always. Mrpete222 uses the 'pop' method. Seal one end of the cylinder with your hand and quickly withdraw the piston. If you hear a pop as the piston leaves the cylinder the fit is good enough for a model steam engine.
Mr Crispin is way smart on set up's. I was glad to see him back.
Bonjour, je regarde vos vidéos avec intérêts, quelle précision dans vos montages, j'admire votre travail, félicitations. Au plaisir!
Nicely done, Quinn. Purty, too. You're coming along nicely, too, young lady. I mean nothing by that other than "well done". Looking quite very goodness! 🙂
Dean
Now every time I watch someone else's videos and they part something off or hit an exact number while weighing something, I'm all "but you didn't say 'yahtzee', you're supposed to say 'yahtzee'…"
Follower rest would work for the small threads (right?). Considered making one?
hey Quinn. I'm a 67 year old retired guy who out of the blue purchased and refurbed a 1950ish south bend 9" model A and decided learning how to operate a lathe would be part of my continuing education. just wanted to say that you are a very good teacher. I'm still way back on your vids from years ago and working my way up. thanks for your help!
Thanks for sharing Quinn. An enjoyable series.
Joe
Verygood
Great stuff. Always enjoy the vids and the explanations are very clear. Hope to one day get a hobby set up myself
Awesome channel, and I love the trick for using both single point and die to do small dia. threading!
Great job. Glad you mentioned Mr Crispin, he's a bit of a legend over here in the UK. As I was watching your video I thought that you needed his special parting tool and then you mentioned him. Dean in Oxfordshire UK.
What are the chances you make some videos about Milling on a Lathe? You are so good at the details, pros & cons., etc. Could you?
could you have put the rings in the cylinder and measured the inside diameter of the rings while in the cylinder to determine the depth of the grooves in the piston?
Y'know what I love?
I love that I – who have never machined anything – had the thought earlier in the video "can't you do half single-point, and finish with a die"? And that's exactly how it worked.
A testament to your channel and content.
if you're using split round dies, it can be helpful to expand the die for the initial passes, and then tighten it down to proper size for the final pass. Be very careful to look at your die and make sure you know which way is which; the screw often opens the die when you tighten it and allows the die to spring back when you loosen it.
Also, the tang is really for ejection. It's not what keeps the taper engaged. Pressure from the work is what does that.
you have to be Boyds machinist's sister!!?? id bet my lunch! i can't remember his name, i know he was on a bad accident though
Nice work. I learn a new technique every time I watch! My uneducated observation, Mr. Crispin is not from the states is he?
Those type rings are used a lot on automatic transmissions. And usually you are supposed to put them on the piston and use a clamp (hose type clamp) to squeeze them down to the piston grooves for a while before installation. Then once they are installed, they spring back out to fit the bore perfectly and seal nicely. Just and idea.
@8:00 I'm no machinist and I don't play one on TV, but I do have a lathe and I like to learn stuff, so isn't this the sort of thing a follow rest is intended for? I'm thinking the die was faster to setup in any case, but if one were making a lot of these or a longer tiny thread, a follow rest would be the way to go, right? I can use this as justification for why I need to buy another tool, yes?
Very nice job Quinn. I like the technique of chamfering on the chuck side when needed with a swiss file. Thank you. Really good job !
Bonjour Queen,
MANY thanks for this topic that I follow like a series, as steam passionate collector. Thanks to your accurate step by step presentations, I discover the amount of work and the skillness needed to build a steam machine. And you did not choose the easiest one, an oscillating machine would have taken you 5 minutes :+)
And I would also like to thank you for the translations inches / millimeters as I am French and familiar with the second one.
About the ring, again, the PTFE is the best choice, and not th easiest to realize, the French manufacturers I know use Viton O"rings. But perhaps your large bore cylinder facilitates the work.
I do not know if you mentioned it before, would I recognize a Stuart S50 ?
Amicalement, Raphaël
Nice job, congratulation. LIKE ???
This is going to be a really nice little engine!
Ps: have a go at making cast iron piston rings.
Down at the steam shop we have the pistons out of our locomotive for a rebuild (a 1924 4-6-2 passenger locomotive built by Alco). The main cylinder is 30” in diameter and the pistons look exactly like yours. The key difference being that these are double expansion steam engines. This is Great work! Loving this series!