#21
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Quote:
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#22
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Hi Kirk,
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Jim Russell |
#23
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Just to dispell the myth, has anybody found flats naturally occurring on radiused anvils?
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Cheers Martin No matter how clever you think you are, stupidity is always one step ahead!!!! |
#24
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Yes I have crushed flats into no hardened anvils . probably wheeling stainless
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#25
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As others have said, it's whatever works for you. Metal just sees PSI, it's up to us how and where to apply it. I don't worry much about tracking in early stages any more than I do about lumps from bag work or tuck shrinking marks. It will all come out in the wash out process.
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Kerry Pinkerton |
#26
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[QUOTE=crystallographic;117636]
Later, I worked on a Wheel that was purchased from the Frank Kurtis remnants, vintage pre-1952 or so. Had a sprocket on the upper so it could be driven for making long skinny sections. I used that Wheel a lot for a while. The rolls all had flats. And the upper was tapered off from the center flat, so that the widest flat on a lower would match the flat on the upper. The Wheel was a dream to use. The taper was .080" or so, by straightedge. I've only seen a few uppers like that, over the years. Kent, I'm interested in your experience with the wheeling machine mentioned above. Was the machine a dream to use because of the unique upper wheel with the tapers, or for other reasons. What specific benefits did you notice in the wheel being configured that way? Was it limited in anyway when compares to a typical flat upper wheel? Thanks. Last edited by mark g; 03-08-2019 at 11:56 PM. |
#27
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Is it just a coincidence?????
Just today I was doing a bit more on my N 11 dvd Called (shaping with the English wheel), and I was explaining and demonstrating why I do not use lower anvils with flats on them .I simply showed the principle behind wheeling with flats and full radius I will let you guys decide which is the better way. I still maintain that the ''flats'' where only anvils worn out in the center by over use, and someone way back then thought that....this is the way that they are when in actual fact they started off as a full radius lower anvil Peter PS to further my point.... If anvils where made purposely with flats, how one determine the width of the flat on each radius anvil ? In another words how wide is the flat on a 36 inches anvil compared to a 8.5 inches anvil etc ? Or are we just guessing??
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P.Tommasini Metalshaping tools and dvds www.handbuilt.net.au Metalshaping clip on youtube http://www.youtube.com/watch?v=WEAh91hodPg Making Monaro Quarter panel: http://www.youtube.com/watch?v=KIpOhz0uGRM Last edited by Peter Tommasini; 03-09-2019 at 04:45 AM. |
#28
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Peter, There is a ratio for the radius vs the width of the flat. I have it sumplace .... But it is a general guide that works with full-size cast frames. Wider flats are fine with thin soft sheet on FLXIble frames. Or with hard sheet on stiff stout frames. Like a 1.5in flat is nice for aircraft structural sheet, when the frame is enough to press tons. And lower rolls with no radius and just flats are not uncommon in aircraft shops. Cannot see any value at all doing full radius on aircraft precipitation hardened structural material - at all - ever - a true non-starter.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#29
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Kent, I agree with all of the above, and you were particularly good about explaining using the anvils with flats on aircraft materials with stiff frames at our last meeting, but would add that in my case it was made clear that on the softer materials like the 3003H14 and the 1018 materials that using the full radius anvils with either a stiff or flexible machine made smoother panels in less amount of time and also minimized the time or even the need for 'washing'.
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Will |
#30
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What does comparative testing show with high crown vs very low crown panels?
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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