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Forum topic by jeff posted 01-19-2012 06:32 AM 967 views 0 times favorited 5 replies Add to Favorites Watch
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jeff

989 posts in 2932 days


01-19-2012 06:32 AM

Topic tags/keywords: joining

i have a craftsmen router model # 135.17508,it came as a package with the router table,it was a gift and certaintly not expensive compared to other set-ups…im building shop cabinets and im having trouble with depth and width issues when cutting dados…i did build an auto dado jig,my surface is flat,work pieces are fully supported and clamped…im using 3/4” oak plywood which is not 3/4”,i thought the auto dado jig would help in determining the width…im using a 1/2” straight bit,the router rides against one side of the jig and i turn it around and finish the rest of the dado…im new to this but feel i have practiced plenty and my set-up is solid but the dados are loose with minor gaps and depth varies…what could i do better…thx…Jeff

-- Jeff,Tucson,Az.


5 replies so far

View NelsonP's profile

NelsonP

12 posts in 1787 days


#1 posted 01-19-2012 07:33 AM

Hi jeffski1,

Assuming that your jig is flat and straight and clamped snuggly to the routed board, this shouldn’t happen. As far as width goes, sometimes it helps to use an offcut of the 3/4” oak instead of the actual larger piece since it’s tougher to hold the larger piece perpendicular and square when setting the width using your auto jig. With the width set right, the piece should resist being removed but can be done so without using a prybar (get the picture)..

Another possible cause is that the bit isn’t centered exactly with your base. Try to run along your template using the same edge for both passes (sometimes those flat edge bases come in handy).

As for the depth variation… I Assumethe bit is tight and the routers depth is consistent?

The jig I’ve used looks very much like this one I use a PC690 (oldie but a goodie)

-- -- Nelson

View Rick  Dennington's profile

Rick Dennington

5183 posts in 2661 days


#2 posted 01-19-2012 08:17 AM

Get a set of router straight cutting bits that are made for undersized plywood…..also get a depth gauge to set the depth of the router bit…usually a 1/4” to 3/8” is deep enough….

-- At my age, an "all--nighter" is not having to get up and pee...!!!

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jeff

989 posts in 2932 days


#3 posted 01-19-2012 08:35 AM

thx Nelson…my set-up is as you have explained except i used a more simpler jig from a WorkBench article…i like the WoodSmith jig though…maybe im not as thorough as i thought and tomorrow i will go through the set-up again…
Rick-i did not know there were router bits for undersized plywood and im trying to figure out how they would work if you were to still use a dado jig…good idea on the depth gauge,ive been using a tape measure,my router depth has been set at 1/4” though for these dado’s…thx…Jeff

-- Jeff,Tucson,Az.

View Rick  Dennington's profile

Rick Dennington

5183 posts in 2661 days


#4 posted 01-19-2012 05:30 PM

Jeff,

Yes…they do make router bits for undersized plywood.. I have a set myself. I bought mine several years ago from MLCS Router Bits and Accessories..They come in a little box of 3…...13/64”, 31/64, and 23/32…the sizes of the plywood we have to buy now….they have 1/4” shank, or 1/2” shank….I’d go with the 1/2” shank myself, if your router will take them…. on sale now for $19.95….both sizes….same price….Just go to MLCS website, and look up straight bits on tha page, and down in the right-hand corner of the page, you’ll see the bits you need…...get a depth gauge, and throw that tape measure in the drawer…not accurate enough..lol. They also sell brass set-up bars for setting the heigth (I also have a set of these) plus digital depth gages, etc….. But anyone who sells router bits will have the undersized plywood bits..it’s your choice where you buy them….

-- At my age, an "all--nighter" is not having to get up and pee...!!!

View jeff's profile

jeff

989 posts in 2932 days


#5 posted 01-19-2012 08:47 PM

Rick, thx for the help…i have to purchase or my shop cabinets will not get finished…Jeff…

-- Jeff,Tucson,Az.

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