Flush Trimming - Router Forums
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post #1 of 6 (permalink) Old 04-22-2017, 08:34 AM Thread Starter
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Default Flush Trimming

I am building a small boat from a set of plans.
I need to flush trim the side plywood to the bottom plywood, This is not at right angles
I want to set the router on the side of the boat and flush trim the wood to the bottom. the angel is 67 degrees.
So it would ge great if the base tilted but the Dewalt 625 does not have that feature. So any ideas on how I could do this. could some sort of a angled shim be attached to the base of the router,
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post #2 of 6 (permalink) Old 04-22-2017, 10:20 AM
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Hi Jeff and welcome. I have seen wedges attached to router bases using double sided carpet tape. Keep in mind that a flush trim router bit has a bearing that follows a pattern outline. Using a guide bushing instead still requires a pattern to follow. Without knowing exactly what and how you plan to trim it's hard to say what is the best way to go about that. There are some trim router packages that include tilting bases. I think the Bosch Colt and the Makita 0700 does for sure (see image in attached link) https://www.google.ca/search?q=makit...gMyT5bTx924QM:
None of the larger routers have that base as far as I am aware.

If you have a picture of what you want to trim it would be helpful to post it. As long as it's in your hard drive and not on a photo sharing site you can do that. Next time you post use the Advanced option and then click on manage attachments. If you require more help just ask.

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post #3 of 6 (permalink) Old 04-22-2017, 11:21 AM
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Not sure just what you're trying to do. But I know a lot of boat builders use power hand planes. Or hand belt sanders.

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post #4 of 6 (permalink) Old 04-22-2017, 07:14 PM
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There are laminate trimmers (small routers) with multiple bases and one of the bases can be angled. My laminate trimmer kit is a DeWalt, about 10 years old. It has a 7/8 hp motor and takes 1/4" shank bits only. There are 4 different bases in the kit that I have, a standard fixed base with adjustable bit depth. An offset base for getting into tight corners, a seaming base for precisely joining two pieces of laminate, and an angle base that lets you angle the bit up to about 45 deg. Laminate trimmers are designed small in diameter but are quite powerful and can handle cbhores like this if you don't expect them to remove a lot of material. Trimming the edge of plywood should be easy for them if you take your time and don't push it along too fast.

This link is a newer model kit than mine and it only contains three bases. The seaming base is not included, but the rest of the bases are, including the angle base.Each base slides onto the end of the motor and locks in place with a lever to tighten it to the motor.


This kit has the identical bases to mine, but the motor has a rounded top and mine is more flat. It's the model that they came out with after I bought mine and the seaming base is not included ( I have only used my seaming base once in 10 years.)

Other brands may be available too, but I'm only familiar with the DeWalt.

Without a router, You could do the beveling with a flexible blade carpenters hand saw following the side of the boat carefully and trimming off the edge of the bottom at the angle of the side. Then use a rasp and sanding block to clean the cut up.
I can remember that my dad did it this way back when I was very young. But if I had to do it today I would go with a laminate trimmer and angle base using a bottom bearing flush trim bit and working with the boat upside down so the trimmer could ride the flat bottom and the bearing on the angled bit could ride along the boat side. An extension board on the router base would make the router more stable as it slid along the boat bottom.


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post #5 of 6 (permalink) Old 04-22-2017, 08:50 PM
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Welcome to the forum Jeff.

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Enjoy the knowledge of others that can be found within.

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post #6 of 6 (permalink) Old 04-23-2017, 12:21 AM
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I dont think a router would be good at that. One slip and it would tear a path through the stuff you want to keep.

As said above, a power planer and then a power sander would be the way to go.

Is this a working sized boat, or a model?

And how much curve is there on the ply?

Sheets of ply are the worst possible wood to use for the curved sides of boats. They have so much spring tension that they will often break away in a fairly short time.
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