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Tearout using Baltic Birch Plywood on Porter Cable Dovetail Jig

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Forum topic by SvenPHX posted 08-09-2014 09:43 PM 1445 views 0 times favorited 5 replies Add to Favorites Watch
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SvenPHX

41 posts in 676 days


08-09-2014 09:43 PM

Just received a new Porter Cable dovetail jig:

I wish to use the jig for the joinery on some pretty heavy duty drawers out of 3/4” (18mm) baltic birch plywood. The router bits are brand new also, they’re the Porter Cable router bits that were supplied with the jig. I had a tinker earlier today and had some pretty awful tearout on the front side, I had a sacrificial piece clamped in the jig and got no tearout in the rear, which will be the outside of the drawer.

Here’s my awful first try with the router at full speed:

This will definitely show inside the drawer.

In the next attempt I tried the router at its slowest speed. The tearout is better, but still not any good. You can see this on the dovetails below.

I then tried to remove the majority of the waste with a 1/4” straight bit which also resulted in tearout, as you can see below:

I’m sure others use this jig for cutting dovetails in plywood. Any tips to help me out before I have to look for another way to do it?

-Steve


5 replies so far

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bobasaurus

1689 posts in 2094 days


#1 posted 08-09-2014 09:53 PM

You’ll probably need some kind of backer board on one or both sides of the plywood to prevent tearout.

-- Allen, Colorado

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SvenPHX

41 posts in 676 days


#2 posted 08-09-2014 11:00 PM

Thank you! With adding a scrap piece to the front too the results are excellent.

I tried the pins at first without the front backer board and it had tearout also. When I added the scrap piece it worked like a charm.

I have some fine tuning to do as the joint is a tad tight and the depths are not quite correct, but I’m satisfied with what I’m seeing so far.

Thanks again!

-Steve

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KevinDrake

1 post in 27 days


#3 posted 05-06-2015 07:05 PM

How did you attached a scrap piece to the front? Can you provide a photo?

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SvenPHX

41 posts in 676 days


#4 posted 05-06-2015 07:15 PM

Sorry mate, this was a long time ago and I don’t have pics. I attached the front backer board by just using the front/vertical PC jig clamp. Basically, doubling up the piece I’m cutting.

I know that almost anything 1/2” and thicker would work as a front backer board. In the end it turned into too much of a pain to do so I used 3/4” Poplar which machines so much better.

-Steve

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runswithscissors

1491 posts in 935 days


#5 posted 05-08-2015 04:05 AM

I learned early on not to try to make dovetails with plywood.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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