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30th October 2018, 11:37 AM #1GOLD MEMBER
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Cutting circles with router - tear out
circle.jpg
Any tips on how to get a cleaner cut when cutting above circle? the blue section?
Anyone use a bearing or something for the centre of their circle cutting jig? I have found that screw becomes loose very quickly - and when that happens when your half way through it could mean your cutting half the thickness of the timber in some sections which seems sketchy
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30th October 2018, 12:05 PM #2rrich Guest
Don't know if it is possible . . . .
Drill the hole for your trammel point all the way through and flip the panel to cut with the router.
Make the cut twice. The first cut is 3 or 4 MM larger than the desired size. The second cut is the actual cut.
Make the first cut with a band saw, again a few MM larger and then the final cut.
Make the cut where you're getting the tear out as a climb cut. Just make the climb cut very thin and really hang on to router as it going to want to climb through the cut.
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30th October 2018, 12:14 PM #3
Would a down cut bit make a difference? It might slice across the grain more.
Franklin
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30th October 2018, 03:21 PM #4SENIOR MEMBER
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From the underside with a nail as my axis for the circle jig, I cut through 40mm blackbutt using an Upcut spiral router bit. Using an upcut bit from the underside meant the top side was being sheared "down" towards the underside. Resulted in a nice finish. Took it in 4 passes.
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30th October 2018, 04:35 PM #5GOLD MEMBER
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For smaller circles, I just make a perfect MDF template. Then using a dual bearing flush trim bit in my router table, I double sided tape the template to the solid timber stock and shape it. Only cutting down the grain, flipping the board over for each quarter circle as required.
For larger circles, dining tables for example, I use a router trammel and of course I rout against the grain for two out of four quarters of the circle. It leaves a pretty average edge finish for sure. But since it is just a dining table, I clean up the edge with a block plane in a few seconds and the job is done. Spiral bits will give a better finish, but better is still "pretty average".
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30th October 2018, 04:37 PM #6Taking a break
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You're cutting into the grain there, so the absolute best way to do it is to flip the thing over so you're cutting with the grain for that section. Not always practical though.
Always remove as much waste as possible before going to the router; your bits and motor bearings will thank you and smaller cuts don't tear out as much.
This will also help, but I would only ever do it with a template and bearing because if it starts to grab you can pull away. With a trammel-type jig, the router is fixed to the job and, if it grabs, it will start running circles around the whole thing faster than you can blink. Did it once, never again.
Up cut or down cut will slice equally well, the only difference is whether the breakout is on the top or bottom.
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30th October 2018, 06:55 PM #7GOLD MEMBER
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This is true if you're only cleaning up a cut edge. Using a downcut bit there will be some upward force exerted by the bit on the router. If you're taking a full bit diameter cut with a downcut bit in multiple passes the upward force can be very considerable. For full depth cuts in one pass the best result will be achieved with a compression bit regardless of whether you're doing full bit diameter cuts or just cleaning up an edge. Once you get the compression bit started in a single pass full bit diameter cut the waste is ejected out the previously routed groove so the problem of the waste having nowhere to go is greatly alleviated.
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6th November 2018, 09:35 PM #8
#1, make sure your router bits are sharp .... especially the very end.
#2, make light cuts near the surface
#3, use no smaller than a 1/2 inch router bit for this work.Any thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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