Hi, I was making a mitered corner lap yesterday and tried to do it with my tenon jig and dado set stacked to 3/8 inch on the table saw. With the vertical guide angled back at 45 deg and the work piece aimed down towards the oncoming teeth, the thing jumped as I eased it into the blade- I am sure because of the end grain. Despite taking small nibbling cuts, I didn’t want to proceed with such an insecure set up. How does one make such cuts with a work piece angled this way? Or is it better to do it with the work piece laying flat so as to not cut the end grain. Is the angle adjustment on the jig only to be used with a normal blade? Thanks, JohnD
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Replies
I have good success with a router held in horizontal position and the workpice in a miter gauge. Plans for this are in back issues of Woodsmith. The bit is a spiral upcut bit.
This jig excels at mortise,tenon.sliding dovetails, and precise joinery. I'm sorry that I can't remember the Issue number of Woodsmith. A search will give you the info.
By the way, almost ALL chips are vacuumed up during cuts and the bits stay sharp.
Thanks for the comments DONC4. I dont have those issues but I can do some research, Thanks, JohnD
Just a hunch here. Is your stock 3/4"? I suspect it may be jumping as the outside blade is encountering less resistance than the inside blade, as it cuts through the face and throws the stack balance off. I wonder if you'd get the same problem plowing through the middle of the stock as in a mitered bridle joint? You could always lay it flat and use the miter gauge and dado like you mentioned. Or switch to a standard blade and do separate angled tenon jig cuts and miter gauge cheek cuts.
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Edited: WHAT was I thinking?? This hit me on the way into work this morning. It's jumping because in addition to the blade spinning toward you, the back half of the blade is spinning upward and trying to lift the stock up off the table. With a normal blade, the amount of force isn't enough to cause problems. But the dado stack has quite a bit more mass. Short of weighing your tenoning jig down with sandbags to counteract the lifting force, this may not be something you can do very well with the dado stack. Excuse my brain f##t from the previous evening.
If you build it - he will come.
Edited 2/8/2005 7:08 am ET by douglas2cats
Thanks for the reply. I think you are probably right with your edited thought- or it may be a combination of both plus a little end grain density added in. I proceeded with a standard blade. Thanks again, JohnD
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