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post #1 of 5 (permalink) Old 01-23-2008, 01:06 PM Thread Starter
 
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My stock is 11/16" thick, if I use a 3/4" bit for the dado will the joinery be too loose?
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post #2 of 5 (permalink) Old 01-23-2008, 01:40 PM
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11/16" is an odd thickness, is this plywood? If so I think you will find that it actually measures 23/32". Various companies make what they call plywood bits which corespond to the actual sizes of plywood: 23/32", 15/32", and 7/32". If you use a different size bit you will have a loose fit and that is bad news. You can always use a smaller bit, make a pass and reposition your guide or fence to complete the size cut you need.

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post #3 of 5 (permalink) Old 01-23-2008, 02:05 PM Thread Starter
 
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Yes, it's plywood, it's a special Maple/Birch combo and I've used 3 different measuring devices on it and it comes up 11/16 every time. I always thought it was 3/4 until I measured 9 x to be sure. LOL

If I get a 23/32 bit and it turns out to be a true 11/16, will that still be too loose?
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post #4 of 5 (permalink) Old 01-23-2008, 02:51 PM
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Hi Ariel

If you are sure it's 11/16" just buy a bit that size...
http://woodworkersworld.net/straight_bits.shtml

And yes if you use a 23/32 bit it will be to loose by a 1/32... but sometimes that good,, unless you have a big rubber hammer..


It sound like wood mfg./lumber mills are doing that now to save money in making playwood and MDF...I got some MDF the other day and it was marked 3/4" but it was 23/32 the norm for plywood... and the norm for MDF, if it's marked at 3/4" thick it should be,,,but the new stuff is going the way of the candy bars...same price less product..




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Quote:
Originally Posted by Ariel
Yes, it's plywood, it's a special Maple/Birch combo and I've used 3 different measuring devices on it and it comes up 11/16 every time. I always thought it was 3/4 until I measured 9 x to be sure. LOL

If I get a 23/32 bit and it turns out to be a true 11/16, will that still be too loose?



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Last edited by bobj3; 01-23-2008 at 10:00 PM.
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post #5 of 5 (permalink) Old 01-23-2008, 09:16 PM Thread Starter
 
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I decided your answers sounded more plausible and ordered the 23/32 bit.

I think I'll be happy with that!
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