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Old 8th October 2011, 09:17 PM   #781
jzagaja is offline jzagaja  Poland
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Ok. let's go with the driver...
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Old 9th October 2011, 04:22 AM   #782
3GGG is offline 3GGG  Australia
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Can anyone comment on how the Fane 8m will go with a JMMLC200 with a 125mm opening?
I will use a 3lt (approx) rear chamber for the driver.

My Le Cleac'h horn build
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Old 9th October 2011, 07:50 PM   #783
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Hello dear comunity
just interested from what distance aceptible to listen e-jmlc horns
Horns
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now i building Yuichi Arai A-290
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Old 16th October 2011, 02:40 PM   #784
jzagaja is offline jzagaja  Poland
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Spun aluminum domes - first trial. Plate thickness is 0.1mm, corrugations and cracks appears quickly.
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Old 16th October 2011, 06:46 PM   #785
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Spun aluminum domes.

Use less tool pressure & make more passes to arrive at the finished profile. As the profile develops, change to a larger live center pressure pad (reverse profile) to better distribute the torsional forces.

Last edited by Ed LaFontaine; 16th October 2011 at 06:49 PM.
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Old 20th October 2011, 03:29 PM   #786
MikeR is offline MikeR  United States
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Quote:
Originally Posted by Ed LaFontaine View Post
Spun aluminum domes.

Use less tool pressure & make more passes to arrive at the finished profile. As the profile develops, change to a larger live center pressure pad (reverse profile) to better distribute the torsional forces.
Sounds like advice from a guy that has spun a little aluminum over the years!
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Old 20th October 2011, 04:04 PM   #787
jzagaja is offline jzagaja  Poland
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Better use a roller? Smoother surface, more uniform thickness, higher tensile strength. Below Ti diaphragm with TiN coating for benchmark.
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Old 20th October 2011, 07:28 PM   #788
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Quote:
Originally Posted by jzagaja View Post
Spun aluminum domes - first trial. Plate thickness is 0.1mm, corrugations and cracks appears quickly.
I expect results are very sensitive to alloy and temper - did you use one recommended for that process?
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Old 20th October 2011, 08:29 PM   #789
jzagaja is offline jzagaja  Poland
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7up aluminum can (side) that why it doesn't want flow again - was deeply drawn and oriented.
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Old 20th October 2011, 10:06 PM   #790
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Ah

Now if you could find out what's a suitable type for deep drawing, or try annealing the can material.

Or try cutting the material from the bottom, as it's closer to the final shape.
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