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Router bit causing tear out

..Brian.. · 2017-10-23 12:32:13

12mm spiral up cut bit. Don't remember it causing gb this much tear out before. It's not a cheap bit, about a year old. Does it need to be sharpened?

23-10-2017 12:32pm

#1

..Brian..

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12mm spiral up cut bit. Don't remember it causing gb this much tear out before. It's not a cheap bit, about a year old. Does it need to be sharpened?

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Comments

#2 23-10-2017 7:12pm

galwaydude18

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..Brian.. wrote: »

12mm spiral up cut bit. Don't remember it causing gb this much tear out before. It's not a cheap bit, about a year old. Does it need to be sharpened?

A spiral upcut will caus that tear out going across grain like that. The idea is that it cuts up thus pulling the dust out when routing

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#3 23-10-2017 10:41pm

..Brian..

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Ah, I should have orientated the work for the groove to go with the grain. Another thing to try and remember when laying out cuts on a sheet of plywood!

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#4 24-10-2017 7:59am

kadman

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You could use a marking knife to cut the fibres before making the cut,
in a similar situation.

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#5 24-10-2017 9:30am

recipio

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Upcut spiral bits are really for clearing the chips. A downcut bit will give much better results, Although expensive, I find spiral bits much cleaner for joint cutting.

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