Bought a lathe so I can turn horns - Page 7 - diyAudio
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Old 2nd April 2013, 02:19 PM   #61
djn is offline djn  United States
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Quote:
Originally Posted by puppet View Post
djn ... you need the cages to shroud the blades. A snapped bandsaw blade is unpredictable.
Yep, if you look at the pix, it covers the whole blade. My shortened two finger tips will attest to the unpredictability of a broken saw blade.

"I ain't afraid of snakes, but I won't put my finger in it's mouth" (Mike Perry)
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Old 2nd April 2013, 02:31 PM   #62
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Originally Posted by AndrewT View Post
not necessarily.

A 3way horn system with 3octaves per horn results in 9octaves, or about 40Hz to 20kHz.

a 4way system with the top three all of ~2.7octaves horns and a non-horn low bass speaker can get to over 10octaves and cover the 20Hz to 20kHz bandwidth and yet stay well within the 3octave horn limitation,

If one had enough space then, a 4way horn system can get to around 11octaves.
Maths wise yes.
Size wise, maybe. Still people build 5 ways for a reason... sound and ease of horn, driver quality and choice.
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Old 2nd April 2013, 02:35 PM   #63
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Tough to see in the pic's (for me at least). I've got a big Yates. He's completely covered top and bottom. Brass or bearing guides on the Crescent? Blade width capacity?
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Old 2nd April 2013, 02:44 PM   #64
AndrewT is offline AndrewT  Scotland
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djn ... you need the cages to shroud the blades.
Yes,
Fortunately the blade has very little inertia and stops very quickly and does not need a strong cage to keep it controlled.

The main inertia is in the drive and guide pulleys and they are constrained by their axles.

If you can go and look at some enclosed blade band saws and ask them to open the door/s so you can see what needs to be done.
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Old 2nd April 2013, 02:56 PM   #65
Pano is offline Pano  United States
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It would be nice to keep this thread on the topic of turning horns, we have other threads for horn and system design.
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Old 2nd April 2013, 07:16 PM   #66
djn is offline djn  United States
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Good thought Pano. If you look at the Yuichi horns, I can turn a disc, then cut it in quarters, take one of the quarters to the band saw and cut an inverted curve on each side, then flip one quarter upside down on top of the other quarter, put on the curved sides and Bob's your uncle......I have a 300hz horn.

1 minute to write it out and 3 days to make a horn
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Old 2nd April 2013, 09:15 PM   #67
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Here are a few pics of how I turned my 345 Hz Tractrix horns. They have a 2" throat,12.5" mouth,and are 9" deep. 14" outside dia.

I cut out and glued circles of MDF,was too lazy to cut out the centers.

The outside was turned freehand,and I used the setup shown to cut the inside.

The 3/4" boring bar was a bit flimsy,so light cuts had to be taken to prevent chatter. While I was turning,I wished I had taken the time to cut out the inside circles.

The pattern and follower at the bottom prevents the tool from cutting too deep,so you don't have to constantly stop to check your progress with a template.
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Old 2nd April 2013, 09:27 PM   #68
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hmm, three days for a hyperbolic horn. When will you have the "add to cart" button on your webpage?

Do the side walls have to share the same profile as the upper and bottom on a hyperbolic, like on a k horn? Otherwise, from one turning, you could potentially have a matched pair (upper and bottom) yes? I'm just scratching the surface in hornresp...
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Old 2nd April 2013, 11:07 PM   #69
djn is offline djn  United States
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Quote:
Originally Posted by Don Bunce View Post
Here are a few pics of how I turned my 345 Hz Tractrix horns. They have a 2" throat,12.5" mouth,and are 9" deep. 14" outside dia.

I cut out and glued circles of MDF,was too lazy to cut out the centers.

The outside was turned freehand,and I used the setup shown to cut the inside.

The 3/4" boring bar was a bit flimsy,so light cuts had to be taken to prevent chatter. While I was turning,I wished I had taken the time to cut out the inside circles.

The pattern and follower at the bottom prevents the tool from cutting too deep,so you don't have to constantly stop to check your progress with a template.
Love your lathe Don!!! I really like that pattern you use. I'll have to give that a try. I use a 1/4" plywood template now and have to keep holding it up to check progress.

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Originally Posted by robotbunny View Post
hmm, three days for a hyperbolic horn. When will you have the "add to cart" button on your webpage?

Do the side walls have to share the same profile as the upper and bottom on a hyperbolic, like on a k horn? Otherwise, from one turning, you could potentially have a matched pair (upper and bottom) yes? I'm just scratching the surface in hornresp...
No "add to cart" yet. I am just messing around combining my two passions.

The sidewalls on the rectangular horns don't have much profile to them. And, yes, one disc will give me a pair of horns.
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Old 3rd April 2013, 12:05 AM   #70
djn is offline djn  United States
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Here are pix of it's new home. The guy told me it was a 3hp, 3ph motor but it is a 1hp, 1ph repulsion/induction motor from Montgomery Ward. It sat on the wood platform hanging off the side.

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