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Router tear out on entry

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Router tear out on entry

Postby Andyp » 23 Oct 2014, 18:26

I have been practising the corner joints for a mirror frame and being as I got the router table serviceable I thought I would use it.
I was prepared for tear out on exit and used a piece of scrap to prevent this but this happened on the entry side. The slots are cut at 45° across a corner.
Is this inevitable or preventable?


Image

This one was done on the table saw a few weeks back. Perhaps this is the preferred method.
Image
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Re: Router tear out on entry

Postby Rod » 23 Oct 2014, 19:52

I cannot remember experiencing that - is your Cutter sharp and running at correct speed?

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Re: Router tear out on entry

Postby DaveL » 23 Oct 2014, 19:59

Andy,
Is that really tear out or have the fibres been rolled back from the face and trimming with a sharp chisel would tidy it up?
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Re: Router tear out on entry

Postby RogerS » 23 Oct 2014, 21:00

DaveL wrote:Andy,
Is that really tear out or have the fibres been rolled back from the face and trimming with a sharp chisel would tidy it up?

:text-+1:
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Re: Router tear out on entry

Postby Peter Sefton » 23 Oct 2014, 21:36

If I am reading this correctly I would say inevitable, as one side of the cutter is back cutting which is causing your problem.
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Re: Router tear out on entry

Postby TrimTheKing » 23 Oct 2014, 22:25

Yep agree with last 3 comments, that's inevitable. Did you use a sacrificial backer, I'm betting not, but that would (should) have enabled the rolled back fibres to have been chopped off.

A pass or two with a block plane would sort that, which you need to do anyway to clean up the end of the wedge.

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Re: Router tear out on entry

Postby Frank » 24 Oct 2014, 06:51

A sharp marking knife is your friend here, just mark the sides of the entry point with a knife I like to cut in a 1/16" just to be on the safe side. I've even been known to accurately mark out the whole slot with a knife on something like this just to ensure I don't get any tear out if the fibres should snag on the top surface

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Re: Router tear out on entry

Postby Mike G » 24 Oct 2014, 07:40

If this was done on a router table, then it is difficult to avoid (unless you take Frank's rather time-consuming hint). However, if it was done with a straight cutter and a guide-bush in a jig, then a plunge cut of say a third of the cutter at most on entry usually obviates the problem.
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Re: Router tear out on entry

Postby berncarpenter » 24 Oct 2014, 08:58

Can you sandwich the cut with sacrificial boards front and back ?
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Re: Router tear out on entry

Postby Andyp » 24 Oct 2014, 10:42

Thanks all. Maybe I should have gone to Specsavers as on closer inspection this morning and after a quick swipe with some sandpaper it does not looks so bad.

Image

Ignore the cut closest to the apex :oops: . The joint BTW has a 10mm dowel in there somewhere so the splines, if I fit them, will be purely for decoration.
As I will be making these grooves on a finished picture frame (50cmx70cm, 20"x28") I feel it might be a lot easier to do so on the table saw. I'll have to wait and see how easy it is to handle when complete.
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Re: Router tear out on entry

Postby TheTiddles » 24 Oct 2014, 21:16

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