#1
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Can plannishing be done with a reciprocating hammer?
Attachment 50251Hi everyone. Can a reciprocating machine be used to planish sheet metal that was formed for example on a stump and wheeled afterwards, containing many different transitions like the ones in the picture? I especiallly have difficulties to get the transitions between different areas evened (is that corect english?). What should be used for this kind of job?
I really would appreciate to have you expert opinion... Carsten
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Carsten Last edited by Carsten; 10-14-2019 at 11:41 AM. |
#2
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I do not know, I will say it. I would use this:
https://www.baileigh.com/media/catal...mmer-ph24a.jpg
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In the morning I was convinced that this was the only solution. Witold https://photos.app.goo.gl/VTz6ETWQhnKyqUQYA https://www.youtube.com/watch?v=hzcKlFjOAoE http://forum.poziome.pl/index.php?topic=1989.0 |
#3
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That's a beautiful job. How I wrote you. Make your EWs more versatile. You have to watch out for the protruding shapes. There is no problem to make a protruding shape. Bigger the problem is to reduce. Make some low places and then pull out the more protruding last. Edges of edges can be increased (radius) in EW at any point. For example, use narrows wheels. Rolling the radius into the cross with a little pressure. I've modified the wheels from the gym. Easy tool and very good result for work.
DSC08451.jpg DSC08453.jpg DSC08590.jpg DSC09742.jpg
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Jaroslav Last edited by Jaroslav; 12-02-2018 at 04:13 PM. |
#4
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Yes, it will be like a Wheeling machine, as the recip. machine is set for thickness the same way, with an adjustment wheel.
Some of the old craftsmen would use a foot-operated control cable on the engaging lever for engaging pressure.
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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. |
#5
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Yes, I have done small areas where my CP dies were too big to work well. It doesn’t work as well as a planishing hammer where the dies work in a constant state of pinch but it’s faster and nicer than by hand. I’ve never been able to get the smooth as glass polished look a planishing hammer gives you with hand work……. smooth enough that my body shop customers are happy but not quite the same. A planishing hammer smooths the mill’s pickled finish into a polished surface. My P21 Pullmax has an pneumatic tooling lift so I can keep both hands on the panel at all times. ~ John Buchtenkirch
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John |
#6
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Great thanks to you all. This helps alot!
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Carsten |
#7
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Some time if no machine tools is suitable, or can not be adapted for a particular shape,... well that when hand skills come in to place
A hammer and slapper (flipper) + dolly could be useful, in some cases you need to make your own dolly Peter
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#8
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Yes i can be done .
Used my pullmax a lot for planishing . Lower dies with the radius you need or as close as possible . i am using airhammer dies and a soft upperdie ( acetat hammer replacement head , the yellow ones ) .
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#9
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Again, many thanks for your Input.
I am planning to design a mechanised hammer during my x-mas holidays (really looking Forward to that ). The mechanical concept shall in principle be similar to the Eckold KF309 (Piccolo) but with VFD and perhaps a little more light weighted - we'll see (15ga max.). Does anyone of you have experience or knowledge of a design that uses a spring arrangement inside the ram to either avoid damage when the distance between ram and anvil was selected too small or to achieve some kind of swinging effect like you have on a Yoder type hammer? (see picture) The idea is to run the hammer in either fixed or swinging mode by use of a locking pin. Attachment 50274 Carsten
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Carsten Last edited by Carsten; 10-14-2019 at 11:41 AM. |
#10
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If you want to try. Use a manual pneumatic hammer from OBI. It has several tools. You cut tools and use ends for different dolls. When you put it in a welded frame. You have very cheap what you need. You can regulate air pressure and move the bottom dolly. If you have good neighbors, buy your headphones for your ears. If you do not have good neighbors, take your headphones off when the job is done.
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Jaroslav |
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