URGENT : Mitre Angle for scoop speaker

darkm4n · 14th January 2004, 03:53 PM

Hi ,

Someone here have the mitre angle's for the this speaker ?
I use 18 mm plywood , someone know what dimension's have the board's inside the bin ? the angle one ?
I'am not so good at math .. so ... you understand ..

Bye ! Thanks !!!!!!

mikee12345 · 14th January 2004, 04:55 PM

draw it in Qcad 1.4 and u can find out the angle of any of them.

I dont think i have enough info to draw it accurately.

Qcad link

Cheers!

darkm4n · 14th January 2004, 05:16 PM

Nope .. i can work in that .. i don't understand it ...

You don't know that angles ? and that mesurement's ?
Please help ..

HeatMiser · 14th January 2004, 05:26 PM

I may have misunderstood the question, but it seems like you can derive the cuts from the angles they provided (I highlighted them in yellow).

I wrote the final angles assuming a straight right-angle cut as "90" although depending on the tool you use straight up and down might be 90 or 0, so adjust accordingly.

Perhaps somebody would be kind enough to check my work, but I think it's correct.

darkm4n · 14th January 2004, 05:29 PM

Aha , THANKS !!!!!!!!

but i don't know the dimension's of that board's .. the angle one's .. there is nothing writed on them ..

HeatMiser · 14th January 2004, 05:33 PM

Quote:

Originally posted by darkm4n
Aha , THANKS !!!!!!!!

but i don't know the dimension's of that board's .. the angle one's .. there is nothing writed on them ..

Oops, I'm sorry - I did misunderstand, and did the easy part that you probably already knew.

I'll see if I can invoke the ghost of my high school trig well enough to figure the lengths...

darkm4n · 14th January 2004, 05:37 PM

Please try ...while i try with the cad software ..

THANKS

HeatMiser · 14th January 2004, 05:52 PM

OK:

The first one should be 1/cos(30) * 270
cos(30) = 0.866, 1/0.866 = 1.155
So the length should be 1.155 * 270 = 311.85

The third (longest) should be 1/cos(15) * (656-152)
cos(15) = 0.966, 1/0.966 = 1.035
Length = 1.035 * (656-152) = 1.035 * 504 = 521.64

I don't really know how to approach the shortest piece, since there are no right angles. I know it's possible to calculate, but I'm not confident enough in my skill in this area to give it a go. Sorry.

And again, I wouldn't go cutting a bunch of MDF based on these numbers unless you can get similar results in software, or somebody comes along and agrees I've done it right.

darkm4n · 14th January 2004, 06:00 PM

I think i found the solution .. thanks for you time !!
My result's were :

The first one ( the front one ) : 365 mm
The second one ( the longest , it face the scoop ) : 515 mm
And the small one , the bridge: 140 mm

I got a milimetric paper and draw a 1:5 scale model ... they i mesure those number's..
The value are close , i think the best is to cut them bigger and adjust them with my saw .. ( circular saw )

HeatMiser · 14th January 2004, 06:04 PM

Cheers, and good luck with your project!

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14th January 2004, 04:55 PM	#2
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	draw it in Qcad 1.4 and u can find out the angle of any of them. I dont think i have enough info to draw it accurately. Qcad link Cheers!

14th January 2004, 05:16 PM	#3
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	Nope .. i can work in that .. i don't understand it ... You don't know that angles ? and that mesurement's ? Please help ..

14th January 2004, 05:26 PM	#4
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	I may have misunderstood the question, but it seems like you can derive the cuts from the angles they provided (I highlighted them in yellow). I wrote the final angles assuming a straight right-angle cut as "90" although depending on the tool you use straight up and down might be 90 or 0, so adjust accordingly. Perhaps somebody would be kind enough to check my work, but I think it's correct.

14th January 2004, 05:29 PM	#5
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	Aha , THANKS !!!!!!!! but i don't know the dimension's of that board's .. the angle one's .. there is nothing writed on them ..

14th January 2004, 05:37 PM	#7
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	Please try ...while i try with the cad software .. THANKS

14th January 2004, 05:52 PM	#8
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	OK: The first one should be 1/cos(30) * 270 cos(30) = 0.866, 1/0.866 = 1.155 So the length should be 1.155 * 270 = 311.85 The third (longest) should be 1/cos(15) * (656-152) cos(15) = 0.966, 1/0.966 = 1.035 Length = 1.035 * (656-152) = 1.035 * 504 = 521.64 I don't really know how to approach the shortest piece, since there are no right angles. I know it's possible to calculate, but I'm not confident enough in my skill in this area to give it a go. Sorry. And again, I wouldn't go cutting a bunch of MDF based on these numbers unless you can get similar results in software, or somebody comes along and agrees I've done it right.

14th January 2004, 06:00 PM	#9
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	I think i found the solution .. thanks for you time !! My result's were : The first one ( the front one ) : 365 mm The second one ( the longest , it face the scoop ) : 515 mm And the small one , the bridge: 140 mm I got a milimetric paper and draw a 1:5 scale model ... they i mesure those number's.. The value are close , i think the best is to cut them bigger and adjust them with my saw .. ( circular saw )

14th January 2004, 06:04 PM	#10
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	Cheers, and good luck with your project!

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