Bits /Cutters for Exact Dado Cuts - Router Forums
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post #1 of 16 (permalink) Old 05-23-2018, 08:57 PM Thread Starter
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Default Bits /Cutters for Exact Dado Cuts

Well now I see cutters for dados and am wondering if it is better to make single passes for width or smaller bits and multiple passes. I'm guessing that using other wood than ply would require either planning the wood to exact thickness to fit the cutter or use smaller bits and make the passses needed to fit the wood. Any ideas? Better way to start?













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post #2 of 16 (permalink) Old 05-23-2018, 09:05 PM
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I like dual pass w/ a narrower bit than the finished dado or groove... no planing required usually...
makes for a cleaner cut...
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post #3 of 16 (permalink) Old 05-23-2018, 10:00 PM
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Using an "exact fit" dado jig, I use a smaller bit and make two passes. As stick says, makes for a cleaner cut.

Check out @MT Stringer uploads/posts for an exact fit jig, but there are a number of similar jigs on youtube.

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post #4 of 16 (permalink) Old 05-23-2018, 10:37 PM
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Members are finding that plywood thicknesses are so varied these days that exact thickness bits don’t always work so many are resorting to the 2 pass method.
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post #5 of 16 (permalink) Old 05-24-2018, 12:44 AM
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Originally Posted by Cherryville Chuck View Post
Members are finding that plywood thicknesses are so varied these days that exact thickness bits don’t always work so many are resorting to the 2 pass method.
Its the dreaded metrification, creeping in by the back door. you'll be fine in another 20 years or so, once imperial has finally died out.
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post #6 of 16 (permalink) Old 05-24-2018, 12:03 PM
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Its the dreaded metrification, creeping in by the back door. you'll be fine in another 20 years or so, once imperial has finally died out.
Actually I think the sizing in todays plywood is a lack of standards, poor manufacturing processes and no quality control. About 6 months ago I saw a load of plywood that was 1/8" difference in thickness from one side to the other. They were waiting on a truck to pick it up and return it to the distributor. The overseas manufacturer's machinery in a new plant was out of wack and no quality control lead to this plywood being sent all the way to a US store before anyone even noticed.

I know I have found large voids in some of the overseas plywood just by running my hand over the surface so I have been buying US made plywood , cost a little more but I don't have to deal with the voids.
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post #7 of 16 (permalink) Old 05-24-2018, 12:23 PM
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1... Actually I think the sizing in today's plywood is a lack of standards, poor manufacturing processes and no quality control.
2... The overseas manufacturer's machinery in a new plant was out of wack and no quality control lead to this plywood being sent all the way to a US store before anyone even noticed.
3... I know I have found large voids in some of the overseas plywood just by running my hand over the surface so I have been buying US made plywood , cost a little more but I don't have to deal with the voids.
1... whole heartily agree...
2... they don't care.. we, the consumer, are their QC..
3... as long as this junk satisfies the wallet buyers.. it will continue to be dumped on us...
look how much FOD you can find in the plies of offshore plywood...
and we get their better junk if you can imagine that...
I like your support America stance... KUDOS...

refuse to buy it...
won't be long before things change...
look what happened to a few companies here as of late because they PO'd the American consumer...
accept garbage and you'll get more garbage.... stink and all...
the next counter body that tells you ''Well that is all there is'' jack slap 'em and shop elsewhere...
management will hear you loud and clear... money talks...

FOD: Foreign Object Debris (FOD) is any article or substance, alien to a product or system, which could potentially cause damage....
https://en.wikipedia.org/wiki/Foreign_object_damage
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Last edited by Stick486; 05-24-2018 at 02:00 PM.
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post #8 of 16 (permalink) Old 05-24-2018, 01:01 PM
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Go Harbor Freight!!!

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post #9 of 16 (permalink) Old 05-25-2018, 05:40 PM
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Default Undersized router bits for nominal 1/4" and norminal 1/2"

For the nominal 3/4" plywood (for shelves) it is feasible to do two passes using short 1/2" PATTERN BITS.

However for nominal 1/4" and nominal 1/2" plywood it is more feasible to use quality UNDERSIZED PLYWOOD DADO PLUNGE ROUTER BITS

e.g from AMANA

://www.toolstoday.com/undersized-plywood-dado-plunge-router-bits.html

CONDITION is you will need a PLUNGE ROUTER not a FIXED BASE ROUTER and a supplier of plywood with Standard dimensions.
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post #10 of 16 (permalink) Old 05-25-2018, 06:40 PM
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Default Cheap Chinese Undersized bits for DIY/handiman available

For about $15 from ebay.
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