Newb. Question - broken router bit - Router Forums
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post #1 of 24 (permalink) Old 03-26-2014, 11:22 PM Thread Starter
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Default Newb. Question - broken router bit

Hey all, first off - been following this forum for a while and THANKS to all for the great content. It's been a great help for a newb like me.

Here's my issue:
Just got my router table set up with a 3/4" straight bit. Set it up for a 3/4" x 3/8" deep rabbet. On my first pass with 3/4" plywood, the piece kicked back on me (or so I remember). I shut the router down and discovered my bit had cratered (see pics)!

Admittedly I am new to routing but I did have the workpiece firmly against the fence and was using a benchdog push block. Also, bit was 1/2" and router is PC 7815 running @21,000RPM

Was this cut too aggressive? Is my setup flawed? Just want to make sure before I get a new bit and try this all over again. Thanks all and sorry if this is a dumb question with an easy answer.
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post #2 of 24 (permalink) Old 03-27-2014, 12:44 AM
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Hello and greetings to the router forums,
First would you please give a first name, like to keep thing friendly.
I not sure but are you telling us that you broke that bit,I see nothing that would have cause that, a 3/8" deep pass may have been a little deep but nothing that would have cause that, were you feeding from right side of table to left, were you holding tight to fence and using down pressure as you cross over the bit. Possible you have a bad bit ( could you have drop this bit on the floor before use)
That is a whiteside bit so if it new should be replaced,they are good bits but sometimes things go wrong

Looking forward to your participation.
Filling out your profile to include (first name,tools and short bio is strictly (optional )but does help members to better relate to each other.
Thank You John

Last edited by Semipro; 03-27-2014 at 12:47 AM.
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post #3 of 24 (permalink) Old 03-27-2014, 01:19 AM
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Hi Oilman, I may be losing something in translation???

broken router bit - bit cratered?

a 3/4" straight bit. - bit was 1/2"


did the cutter actually break or did the carbide come off?

The router speed may be OK , how was your speed of feed?

3/8" deep cut with 3/4" cutter should not be a problem.

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post #4 of 24 (permalink) Old 03-27-2014, 01:47 AM
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Welcome to the forum.

Ross,
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Enjoy the knowledge of others that can be found within.

‘Members are requested to add a first name in their profile as we are a very friendly bunch here'.
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post #5 of 24 (permalink) Old 03-27-2014, 09:13 AM
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welcome aboard.....

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post #6 of 24 (permalink) Old 03-27-2014, 09:16 AM
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On close inspection, 2nd pix, the plies look very much like bacon.
(Smoked or just ordinary off the butcher, shelf bacon, it makes a difference.)

Now really, the problem: Speed and depths of cut kill.
3/4 x 3/8 is waste-able but demanding.
Take it as fast you can with a new cutter, and you can easily break it.
Bad cutter? I doubt it, WMC q.c. is as good as it gets but a remotely possible, nevertheless.
Prevention: With your big machine, keep the waste to <3/8 x 3/8 and I'd be taking only 1/2 of that. And slow down. Let the feed rate = cut rate, don't exceed that. And that takes practice.
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post #7 of 24 (permalink) Old 03-27-2014, 02:18 PM Thread Starter
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Thanks for all the help. Sorry for the confusion: "cratered" is an oilfield term for broke but it was the carbide cutter that broke. It was a 3/4" bit with a 1/2" shank. Had workpiece up against fence and pushing down with my push block. If anything I thought I was going too slow as I didn't want to screw anything up on first pass!

As Quillman suggests I'll take smaller bites on the next go around. I just didn't realize with as beefy of a router and bit that I would have issue in plywood taking all in 1 pass.

Again, thanks for all the help!
Chris
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post #8 of 24 (permalink) Old 03-27-2014, 02:48 PM
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7518, one of many routers capable of breaking bits.
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post #9 of 24 (permalink) Old 03-27-2014, 03:21 PM
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Might this kind of thing happen because of the glue in the laminates heating and hardening as it cuts...? Not solving Oilman's problem but just asking for my own education. Should routing laminates be handled differently in general...?

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post #10 of 24 (permalink) Old 03-27-2014, 04:35 PM
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The glue will definitely cause wear lines where they are but not break a bit.
Since the plies are presented at so many angles, it's about the same as routing at 45° to long grain. As such, it is a labored cut and should be wasted as end grain, sparingly/pass.
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