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Specific Engine Help / Re: radial engine cam material choice
« Last post by Mcgyver on Today at 08:25:13 PM »
I guess in my thick skull I'm still wondering - if I'm going to heat steel up to cherry red for any of these material options (O1, A1, Steel X, Steel Y with hardening powder...), wouldn't it make sense to use the alloy that yields some increased hardness but with the least amount of quenching temperature reduction shock... which seems to be what air hardening steel is all about? Maybe I'm still missing something here?

I would say yes, and it would be a no brainer.....if not for the excellent points Tug made.   Perhaps A2 sandwiched between a moderate thermal mass (1/8 - 1/4 plate maybe?) is the answer.  Sorry, can't be more certain than that, I don't the experience with such delicate profiles, I'd have to give a try and see how it comes out.
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From Kits/Castings / Re: Strictly.... “ Hot Air “
« Last post by Alyn Foundry on Today at 08:25:08 PM »
Anson " commission " update.

Overall time 2 hours give or take.

Cheers Graham.
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Your Own Design / Re: Two Cylinder Engine
« Last post by Roger B on Today at 08:13:16 PM »
The next step was to bore out the big end clearance in the middle of the crankcase. This required the boring bar to be set at an angle and the crankcase to be turned round to finish the second end. The bearing surfaces were then clocked concentric and finished to size.
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Introduce Yourself / Re: Hi from Yorkshire
« Last post by pgp001 on Today at 08:11:03 PM »
Hello and welcome from another Yorkshireman.

Send me a PM about where you are based etc, we may not be that far apart and there are a few of us on here.

Phil
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Introduce Yourself / Re: Hi from Yorkshire
« Last post by Roger B on Today at 08:06:50 PM »
Welcome to the Forum  :ThumbsUp:  :ThumbsUp:
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Introduce Yourself / Re: Hi from Yorkshire
« Last post by Art K on Today at 08:04:00 PM »
Hian,
Welcome to the forum! I think you know already that you will find folks interested in every branch of the engine family tree.
Art
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Engine Ancillaries / Re: Val, What does it do?
« Last post by Art K on Today at 07:58:22 PM »
Dave,
No I have not tried loading it. That would mean making up some sort of fixture to mount the two of them and finding a load. I think I have two of these so I could set it up to run the other, granted the shop gnomes haven't stolen it and hid it. I will try to work on this later, or tomorrow.
Art
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Specific Engine Help / Re: radial engine cam material choice
« Last post by petertha on Today at 07:42:39 PM »
A2 costs about 43 USD for .125thick x 2" x 18"
A can of the hardening stuff is about half that.

Here are some A2 specs I found.
https://www.hudsontoolsteel.com/technical-data/steelA2
I suspect the size change chart doesn't properly address potential problems with some of my cam plate features like the holes, proximity to edges, non-symmetry etc.

I guess in my thick skull I'm still wondering - if I'm going to heat steel up to cherry red for any of these material options (O1, A1, Steel X, Steel Y with hardening powder...), wouldn't it make sense to use the alloy that yields some increased hardness but with the least amount of quenching temperature reduction shock... which seems to be what air hardening steel is all about? Maybe I'm still missing something here?

I'm still digging around the knife blade forums because I'd think if anyone would be super concerned about warping (= scrapping) a skinny & weirdly shaped part it would be them. I thought maybe I misunderstood the purpose of the ambient temp aluminum clamp plates, sometimes called quench plates. I just assumed it was to minimize distortion during cool down. Other links refer to a slight cooling acceleration affect to tweak hardness. But this link & others like it seems to suggest its more about mitigating distortion.
https://www.bladeforums.com/threads/air-quenching.570302/
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From Plans / Re: Brian does Ridders flame eater
« Last post by NickG on Today at 07:39:15 PM »
Good point about the bearings Brian. Some people fall into the pit of thinking they should be a tight press fit only to find that crushes the outer race and causes a load of friction in the bearing. Your slots in the bottom might help things along too. Once assembled, you could turn over a few times with the cylinder pedestal bolts finger right which should allow it to find its own sweet spot before tightening. I had a look at the changes Jan has made, apart from the piston being graphite (I know you’re going for CI) I can’t see how it will be that much more reliable. I am not yet convinced that stainless steel will fix the ‘corrosion’ problem as I thought it was products of combustion sticking to the cylinder rather than rust. We’ll soon find out though. Jan has also increased the bore quite a bit, in theory that makes it more powerful, but it’s meant the port is even bigger and thus the chance of sucking in cold air. Think the flame will need to be on the large side to run this, it’s dimensions are quite beastly! Great to watch keep up the good work.


Sent from my iPhone using Tapatalk
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From Kits/Castings / Re: A Robinson from rejects.
« Last post by Jasonb on Today at 07:24:18 PM »

What happened to the casting fondling  :facepalm:


I'll leave that to the girlies :LittleDevil:
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