???? STUPIDITY or IGNORANCE ???? HELP - Router Forums
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post #1 of 26 (permalink) Old 05-03-2012, 12:38 AM Thread Starter
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Default ???? STUPIDITY or IGNORANCE ???? HELP

I have a friend who asked me to build some speaker boxes for a old truck He is remodeling, anyway one of the holes nedds to be cutout 5.13" in diameter my question is what would .13" equate to ????? I can think of many answers to this maybe I am overthinking or just late after a long day...Any help would be apprecciated

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post #2 of 26 (permalink) Old 05-03-2012, 01:12 AM
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I have a friend who asked me to build some speaker boxes for a old truck He is remodeling, anyway one of the holes nedds to be cutout 5.13" in diameter my question is what would .13" equate to ????? I can think of many answers to this maybe I am overthinking or just late after a long day...Any help would be apprecciated
Warren;it's a tich over 5 1/8"...
if you make the hole the same size as the speaker..5 1/8"... it won't fit, obviously.
The extra 1/64", or whatever it actually is, is just clearance.
I think he should have given you the speaker and let you fit it.
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post #3 of 26 (permalink) Old 05-03-2012, 05:34 AM
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5 1/8" would be 5.125" so it could even be 5 1/8" plus a rounding error! The difference is only 5 thousandths of an inch.
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post #4 of 26 (permalink) Old 05-03-2012, 06:15 AM
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I think that if your friend wants the hole to be that perfect, it's going to be tough to suite him with the rest of the box.

If, as DaninVan says, it's a tick over 5 1/8", I'd say cut the hole 5 1/4". That would give you about 1/16" clearance on all sides. The mounting flange on the speaker should cover that. If not, the grill for the speaker should.
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post #5 of 26 (permalink) Old 05-03-2012, 07:24 AM
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papawd
.13 is 13/100, forget trying to reduce that down to a fraction that can be used.
Like AndyL said 5 1/8" would be 5.125 so what I would do since you want it a little larger then that is to convert 1/8 to ?/64 which is 9/64 then add 1 to that and make the hole 5 10/64. 5 10/64 converts to 5.14 r4 thats 1/100 difference, close enough.

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post #6 of 26 (permalink) Old 05-03-2012, 07:36 AM
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5.13 is 51/8" rounded down from 5.125 (thousandths) to 5.13 (hundredths). In the best choice....TAKE THE LINE. :-)

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post #7 of 26 (permalink) Old 05-03-2012, 07:49 AM
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There is a simple answer, ask him for the measurement in METRIC.............problem solved!

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post #8 of 26 (permalink) Old 05-03-2012, 08:05 AM
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Originally Posted by papawd View Post
I have a friend who asked me to build some speaker boxes for a old truck He is remodeling, anyway one of the holes nedds to be cutout 5.13" in diameter my question is what would .13" equate to ????? I can think of many answers to this maybe I am overthinking or just late after a long day...Any help would be apprecciated
Hi Warren,

How did he arrive at a measurement of 5.13" - was this a metric figure converted to imperial?

I would use the jasper jig and cut at 5 3/16"'.

Check the speaker dimension to see what that is.

I think the customer is guessing at the size based on a metric round down as suggested earlier.

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post #9 of 26 (permalink) Old 05-03-2012, 08:31 AM
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I think it might be worth the time to put a set of calipers on the speaker yourself and write down what it it comes up with. On the other hand, the hole being an 1/8 to 1/4 larger than it needed to be would be far less of an issue than the hole turning out too small.

I cut out some circles in 3/4" ply once with a jig set up beside a scroll saw. The jig wasn't that impressive either. 1/4" dowel in a block bolted to the same bench as the saw so that it stayed the same distance from the blade. I rotated the work piece on the peg as the blade passing it along the blade as it turned.

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post #10 of 26 (permalink) Old 05-03-2012, 09:13 AM
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When mounting a speaker, the through hole is at least 25mm (1") smaller than the overall diameter of the speaker and a rebate is routed to be close to the exact size of the overall diameter so that the speaker is flush to the surface and an airtight fit into the rebate. for serious scientifically designed speaker enclosures it's important that there are no air leaks around the speaker, often a small amount of sealant is used.

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