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Forum topic by mIps posted 07-26-2013 07:52 PM 1008 views 0 times favorited 25 replies Add to Favorites Watch
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mIps

175 posts in 809 days


07-26-2013 07:52 PM

Topic tags/keywords: router question

I was doing some testing for a upcoming project attempting to router a slot into some plywood. I set the 1/4 straight flute bit to roughly 1/4 deep, plunged the plywood onto the bit and routed roughly 1 1/2” slot. When I removed the plywood, there was a bit of blackness on the slot and the end of the bit that was in the wood was black. Was I feeding too slow, too fast or do I need a spiral bit to really make this work?

Thanks in advance!

-- Be honest, honorable, kind, work hard, and generally be awesome.


25 replies so far

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PurpLev

8476 posts in 2403 days


#1 posted 07-26-2013 08:00 PM

sounds rather normal. 1/4” slot is narrow – not a whole lot of air and space for chips to clear and heat to dissipate adding to the already susspeceptive to burn process (router at high speed). plunging also adds a great deal of probability to burning. a spiral bit would help in 2 ways:
  1. spiral channels will clear chips more efficiently
  2. acts more like a drill for plunging actions than a straight bit

with that said, 1/4” deep is fairly deep… I would recommend lowering the depth to 1/8” or even less depending on your wood/bit/experience and doing this in 2-3 passes each pass taking a bit of depth until the final pass which gets you to the desired depth. this would reduce/eliminate burning, as well as protect your bits./routermotor long term

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View mrjinx007's profile

mrjinx007

1833 posts in 522 days


#2 posted 07-26-2013 08:02 PM

The plywood being laminated sheets have a lot of glue in them. A steel flute bit or any other steel bit will more likely turn black with plywood and oily woods. Look for a carbide bit to eliminate the problem. more expensive but worth it.

-- earthartandfoods.com

View Dusty56's profile

Dusty56

11688 posts in 2442 days


#3 posted 07-26-2013 08:05 PM

I agree with Purp, especially regarding the too much too soon on such a tiny bit. Plus all of the glue in the ply doesn’t help matters.

-- I'm absolutely positive that I couldn't be more uncertain!

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mIps

175 posts in 809 days


#4 posted 07-26-2013 08:11 PM

Thanks! The bit I have appears to be carbide tipped so I will decrease depth of cut to more like 1/8” and try again. Should I try to clean the bit and, if so, how?

-- Be honest, honorable, kind, work hard, and generally be awesome.

View Loren's profile

Loren

7831 posts in 2402 days


#5 posted 07-26-2013 08:30 PM

Normal. I don’t think you can normally burn carbide
with normal woodworking applications, but oils
and glues seem to liquify at router speeds and
contribute to burning. A bit can get hot enough
from cutting wood to burn the wood pretty
easily too.

Oven cleaner removes pitch from cutters. It’s gross
stuff though so you may want to try soaking in
some strong detergent mix and scrubbing with
a brush. Works well on band saw blades too.

-- http://lawoodworking.com

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Dusty56

11688 posts in 2442 days


#6 posted 07-26-2013 08:37 PM

ditto

-- I'm absolutely positive that I couldn't be more uncertain!

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gfadvm

11556 posts in 1444 days


#7 posted 07-27-2013 12:49 AM

Purple’s advice is spot on!

I soak my bits in either Simple Green or Bug and Tar Remover from the auto parts store. Both work well.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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mIps

175 posts in 809 days


#8 posted 07-27-2013 04:26 AM

Okay, I think I’ve got some simple green hanging around so I’ll see if I can locate it and give it a shot.

Thanks again!

-- Be honest, honorable, kind, work hard, and generally be awesome.

View kizerpea's profile

kizerpea

746 posts in 1122 days


#9 posted 07-27-2013 12:38 PM

Most of the time..if its black …its dull now..its been hot.

-- IF YOUR NOT MAKING DUST...YOU ARE COLLECTING IT! SOUTH CAROLINA.

View joeyinsouthaustin's profile

joeyinsouthaustin

1286 posts in 827 days


#10 posted 07-27-2013 01:32 PM

I use this knife dressing from bostik to decrease burning (aside from the technique recommendations from the others) It works great, and also make cleaning a lot easier. I also clean and dress with this before storing.. really aids the life of all your blades and knives.

-- Who is John Galt?

View Danpaddles's profile

Danpaddles

540 posts in 1066 days


#11 posted 07-27-2013 02:47 PM

Some (cheap) straight router bits are not made to plunge, look if the carbide on the tip extends in past the center point. I have one or two that way, but they are larger bits.

This bit would not want to plunge-

-- Dan V. in Indy

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Dusty56

11688 posts in 2442 days


#12 posted 07-27-2013 03:24 PM

kizerpea and danpaddles, both good points : )

-- I'm absolutely positive that I couldn't be more uncertain!

View mIps's profile

mIps

175 posts in 809 days


#13 posted 07-27-2013 03:25 PM

Dan, My bit looks almost exactly like that. darn. okay, then on to plan b.

If The bit is now dull, as kizerpea suggests, can I sharpen it or should I not bother trying ( I have only basic stuff like a hand file and such)?

-- Be honest, honorable, kind, work hard, and generally be awesome.

View Dusty56's profile

Dusty56

11688 posts in 2442 days


#14 posted 07-27-2013 03:35 PM

I would toss it at this point, unless you have a small , flat diamond file / card, that will fit into the groove.
If you do, be sure to make the same number of strokes on each flat side to maintain balance of the bit.

-- I'm absolutely positive that I couldn't be more uncertain!

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mIps

175 posts in 809 days


#15 posted 07-27-2013 03:41 PM

Double darn. This is the only 1/4 bit I have. Grrr…

-- Be honest, honorable, kind, work hard, and generally be awesome.

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