LumberJocks

This wasn't supposed to happen...

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Safetyboy posted 05-30-2008 12:08 AM 1139 views 0 times favorited 10 replies Add to Favorites Watch
View Safetyboy's profile

Safetyboy

119 posts in 3815 days


05-30-2008 12:08 AM

Topic tags/keywords: router

I was routing mortises for some doors I was making for a shop cabinet (figured it was good practice). Using a spiral upcut bit, I plunge the ends, then route away the middle about a 1/4” at a time. Halfway through the first 1/4” cut, my bit snaps in half!

Don’t think that’s supposed to happen! Guess it’s back to knocking them out by hand:

I’m terribly slow by hand, but I guess it’s good practice until I can pick up another bit. I do not really love my router – but it’s so much faster than I can do things by hand at the moment, I still use it.

-- -- Kevin in Mentor, Ohio


10 replies so far

View GaryK's profile

GaryK

10262 posts in 4044 days


#1 posted 05-30-2008 12:16 AM

Solid carbide is very brittle. It happens.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View Taigert's profile

Taigert

593 posts in 3896 days


#2 posted 05-30-2008 12:34 AM

Try drilling the worst part out, foristner bits work really well. As close to end as it looks its hard to not blow out the end without a backing block if your chopping them by hand.

-- Taigert - Milan, IN

View motthunter's profile

motthunter

2141 posts in 3854 days


#3 posted 05-30-2008 01:06 AM

this happens. what speed were you using on the router? were you forcing your speed or letting the machine do the cutting?

-- making sawdust....

View Lee A. Jesberger's profile

Lee A. Jesberger

6860 posts in 4035 days


#4 posted 05-30-2008 01:26 AM

Your quite lucky you weren’t hurt!

There are a number of other way to cut mortises. This method you used is normally not a problem. Maybe the bit was faulty, or maybe you were forcing it, as opposed to letting the tool do the work.

My guess is a faulty bit.

Lee

-- by Lee A. Jesberger http://www.prowoodworkingtips.com http://www.ezee-feed.com

View Mario's profile

Mario

902 posts in 4107 days


#5 posted 05-30-2008 02:52 PM

WOW that is not good, but as long as you did not get hurt it is not all bad.

-- Hope Never fails

View Joey's profile

Joey

276 posts in 3871 days


#6 posted 05-30-2008 07:40 PM

solid carbide is not good to use while cutting deep or heavy cuts. i found out the hard way too.
i’ve gone back to straight bits or shear cutters when i can find them. a shear bit is like a straight bit but the flutes are set at an angle.

-- Joey, Magee, Ms http://woodnwaresms.com

View Grumpy's profile

Grumpy

24045 posts in 3907 days


#7 posted 06-03-2008 07:51 AM

Lucky for you Kevin, no injury. I had a similar thing happen, the bit broke, hit the floor inches from my left foot. They are a great tool but need to be treated with a lot of respect.

-- Grumpy - "Always look on the bright side of life"- Monty Python

View Douglas Bordner's profile

Douglas Bordner

4024 posts in 4119 days


#8 posted 06-03-2008 06:06 PM

I use HSS spirals for this type of work, not so brittle.

-- "Bordnerizing" perfectly good lumber for over a decade.

View Grumpy's profile

Grumpy

24045 posts in 3907 days


#9 posted 06-03-2008 11:32 PM

Yes Douglas, me too.

-- Grumpy - "Always look on the bright side of life"- Monty Python

View Loren's profile

Loren

10476 posts in 3703 days


#10 posted 06-06-2008 05:27 AM

With a plunge router it is more difficult to “feel” the cut.
I always disliked mortising with a plunger. When I got
a horizontal mortiser it was a very different experience -
all my energy was going into guiding and feeling the
cut – much more relaxing and you can feel when you
are cutting too much at a time.

I have never broken a 1/2” spiral flute bit but I have
snapped 1 or 2 1/4” bits in half – they are quite fragile.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com