Since the second enclosure will have the pipes winding upward to the left, (as opposed to the first speaker winding upward to the right), I think this illustrates why the 11° line must be on the opposite side of the centerline when you cut the pieces for the second speaker.
Faustian pointed this out in post # 166.
Faustian pointed this out in post # 166.
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yes, I can independently confirm that. That's what I was talking about, and my suspicions, for once, were correct.
That is, if we mean the same thing when I say "-11° for one and +11° for the other."
ready for a pic? It's cut with my brand spanking-new jig out of a telescoping mailing tube I found. The rotation is of an indeterminate angle, but is always positive, that is, rotated away from me on my jig.
Dave
That is, if we mean the same thing when I say "-11° for one and +11° for the other."
ready for a pic? It's cut with my brand spanking-new jig out of a telescoping mailing tube I found. The rotation is of an indeterminate angle, but is always positive, that is, rotated away from me on my jig.
Dave
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Sch3mat1c said:
Yamaha Clavinova, the 2nd tier model from 1997.
Yes, that cardboard tubing represents a great victory to come!
Dave
yeah, but how did our spiral design end up looking like a yamaha piano? damn, we're better than we thought!
😎
keep going, keep going!!
😎
keep going, keep going!!
I cut a piece of pipe just to check. the jig will work as I propose.. it will produce pieces that will work for left or right spirals, The jig cuts a 22 degree angle to one plane and 5.5 degree at 90 degrees to that plane (the 5.5 degree cut is plus 5.5 degree for right spiral and minus 5.5 degrees for left spiral. The two diagnols need to be cut with the pipe roated 180 degrees.
I made a small jig for 1.5 inch pipe and cut some segments to test the principle. I'll try to include photo..
I made a small jig for 1.5 inch pipe and cut some segments to test the principle. I'll try to include photo..
Attachments
Steve,
The pic is at an angle. The 5.5 degree angle is built in to the jig? So instead of a strict vertical cut, it will slope?
Dave
The pic is at an angle. The 5.5 degree angle is built in to the jig? So instead of a strict vertical cut, it will slope?
Dave
Correct. The cut in the jig is angled at 5.5 degrees from vertical. Plus 5.5 degrees produces a right spiral. a slope of minus 5.5 degrees produces a 'left' spiral. I cut 6 segments.. didn't bother to measure for length.. also during assembally I simplly matched up the cuts... no twisting..no measuring.. just fit the pieces together so they matched up as best I could.
In order to make that 180 degree twist I suggest that you mark 2 lines down the length of your pipe.. one on each side (180 degrees from each other) ... mark a center line on a brace.. (on top of the jig)... this will make it easier to set up the pipe to make your cut.
In order to make that 180 degree twist I suggest that you mark 2 lines down the length of your pipe.. one on each side (180 degrees from each other) ... mark a center line on a brace.. (on top of the jig)... this will make it easier to set up the pipe to make your cut.
Steve, I am having a certain amount of difficulty understanding how your jig works. You do not have to explain in detail, but I have one question.
Will your jug produce pieces where the 22.5° diagonal cut on one end is rotated a full 11° from the 22.5° diagonal cut on the other end?
Faustian worked this out for us, and the end diagonal cuts must be rotated fully 11° from each other, not 5.5°.
I realize that 5.5 is half of 11. I am just wondering if you are figuring that since two 22.5° angles add up to make the 45° angle for the octagon, then each piece needs to be rotated only 5.5°.
My understanding is that is not the case. Each individual
piece must have the 22.5° cuts rotated 11° from each other.
Will this jug produce that, or will it produce pieces that have the 22.5° cuts rotated 5.5° from each other?
If the pieces do in fact have the 22.5° ends rotated at 5.5°, then you will get the spiral from it. But it will be at the wrong angle, and the entire Transmission Line will be shorter in height than what we were aiming for.
So, does this jig produce pieces with the 22.5° angles rotated 11° or not? I am not sure, but I thought it was important to ask.
Will your jug produce pieces where the 22.5° diagonal cut on one end is rotated a full 11° from the 22.5° diagonal cut on the other end?
Faustian worked this out for us, and the end diagonal cuts must be rotated fully 11° from each other, not 5.5°.
I realize that 5.5 is half of 11. I am just wondering if you are figuring that since two 22.5° angles add up to make the 45° angle for the octagon, then each piece needs to be rotated only 5.5°.
My understanding is that is not the case. Each individual
piece must have the 22.5° cuts rotated 11° from each other.
Will this jug produce that, or will it produce pieces that have the 22.5° cuts rotated 5.5° from each other?
If the pieces do in fact have the 22.5° ends rotated at 5.5°, then you will get the spiral from it. But it will be at the wrong angle, and the entire Transmission Line will be shorter in height than what we were aiming for.
So, does this jig produce pieces with the 22.5° angles rotated 11° or not? I am not sure, but I thought it was important to ask.
I put up a drawing on Post # 173 to illustrate the position of the 11° rotated angle to the centerline. Centerline is in red, 11° cut line is in green.
Actually.. the jig cuts 5.5 degrees from both sides of the segment.. the two ends are cut at 11 degrees from each other, (this angle is achieved with a single 180 degree twist.. not 185.5) the same as they would be if you cut only one side at 11 degrees to the other. But your are right that the 'spiral' is achieved by an 11 degree twist. the whole point of this cut is to achieve a better alignment when you make that 11 degree twist.
GREAT NEWS!!!
I mentioned my project in order to entertain a lady I know, and she says, very cheerfully, "Bring it over this afternoon. My husband has all sorts of power saws for silly projects like this."
Sure enough, the guy has a 12" Bandsaw, among others. YES!
I'll definitely post back with pics later this (Sunday) evening. In the meantime, I have a very messy apartment to clean.
My workshop is (was) outdoors, and since it's like Canada around here (32°F highs), my workshop is now on the kitchen floor. In short, you can imagine the mess. I have only four hours to clean it.
I'll test the angling in full with the tubing, now that I have a giant powered band saw to play with.
Dave
I mentioned my project in order to entertain a lady I know, and she says, very cheerfully, "Bring it over this afternoon. My husband has all sorts of power saws for silly projects like this."
Sure enough, the guy has a 12" Bandsaw, among others. YES!
I'll definitely post back with pics later this (Sunday) evening. In the meantime, I have a very messy apartment to clean.
My workshop is (was) outdoors, and since it's like Canada around here (32°F highs), my workshop is now on the kitchen floor. In short, you can imagine the mess. I have only four hours to clean it.
I'll test the angling in full with the tubing, now that I have a giant powered band saw to play with.
Dave
steve said:
Thanks, Steve. I had a hunch that might be what was happening, but I had difficulty envisioning what the angles were as the pipe was rotated 180° in the jig.
I didn't want to doubt you, but I just wanted to make sure all this was straight before PVC started getting cut.
Kneadle:
Re: The Kitchen
Do you think it would help if your wife was was told that the recently late, great Paul Klipsch built his first Klipschorn, a legendary speaker that is still produced today, in his back yard using nothing but a couple of saw horses and a hand saw?
This was back in the 1940's, and not only is the Klipschorn still mentioned as perhaps the greatest speaker ever produced, it was the basis for a multi-million company that is still going strong.
You, Kneadle, are following in the grand tradition of audio pioneers who, once they embarked on their quest, refused to let anything get in the way between their vision and reality.
Think that would help?
Re: The Kitchen
Do you think it would help if your wife was was told that the recently late, great Paul Klipsch built his first Klipschorn, a legendary speaker that is still produced today, in his back yard using nothing but a couple of saw horses and a hand saw?
This was back in the 1940's, and not only is the Klipschorn still mentioned as perhaps the greatest speaker ever produced, it was the basis for a multi-million company that is still going strong.
You, Kneadle, are following in the grand tradition of audio pioneers who, once they embarked on their quest, refused to let anything get in the way between their vision and reality.
Think that would help?
kelticwizard said:Kneadle:
Re: The Kitchen
.... refused to let anything get in the way between their vision and reality.
Think that would help?
heh...perhaps in the 1940's spouses were willing to play second fiddle to a backyard hobby. it's my impression that times have changed a bit since then. maybe one of the old-timers can regale us with stories of the 'good old days' when men could take women for granted.
😱
/andrew - who hopes his sarcastic wit is not misinterpreted
hey if I were you.. and I survived this project (because my wife hadn't already killed me) I think I'd stick with her.. cause your not likely to find another that won't kill you the next time you get one of these ideas. just my opinion...
Originally posted by faustian bargin
/andrew - who hopes his sarcastic wit is not misinterpreted
Not at all. I'm just happy to see that Andrew is perceptive enough to realize that, despite it's intentionally over-bombastic style, the "Re: The Kitchen" post was still meant to be taken seriously. 🙄 🙄
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