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lipped brad point drill bits delayed drilling

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Forum topic by treesner posted 10-10-2016 03:49 AM 660 views 0 times favorited 13 replies Add to Favorites Watch
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treesner

166 posts in 426 days


10-10-2016 03:49 AM

Hey guys i bought a set of HSS lipped brad point bits from from veritas and am really unhappy with how they drill so i’m wondering if it’s an operator error or what.. Basically what happens to me is i begin drilling (hand drill) it digs in a little ways then it seems like it just spins there not drilling and all the sudden it grabs and rips through the rest of the cut. At first I thought it was just a plywood problem as I would drill through baltic birch plywood and a single ply would get stuck on the tip that I would have to remove but I had the same issue when I split out an end of a piece of hardwood handle I was working on because it was so much of a jolt.

http://www.leevalley.com/us/wood/page.aspx?p=42247&cat=1,180,42240


13 replies so far

View pintodeluxe's profile

pintodeluxe

4853 posts in 2275 days


#1 posted 10-10-2016 04:02 AM

Brad point bits are pretty aggressive. I like to use them for stopped depth holes at the drill press. Forstner bits cut cleaner, but are less aggressive.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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treesner

166 posts in 426 days


#2 posted 10-11-2016 06:48 PM

With the cordless drill should I be going full speed into it or have the drill spinning slower

View gargey's profile

gargey

457 posts in 237 days


#3 posted 10-11-2016 06:56 PM

The issue sounds like the bit is slipping in the chuck. Which would make it a chuck problem or user problem, not a bit problem.

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treesner

166 posts in 426 days


#4 posted 10-11-2016 06:58 PM



The issue sounds like the bit is slipping in the chuck. Which would make it a chuck problem or user problem, not a bit problem.

- gargey

I don’t think that’s the issue, more so imagine that you were drilling through different densities of materials and it slows down through the hard stuff. Except that the issue happens even in a sort 2×4

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treesner

166 posts in 426 days


#5 posted 10-12-2016 05:50 AM

here’s a video of what i’m talking about, first bit is 3/8 and the grabbiness is apparent then second bit is smaller bit less. tried really slow to see how it changes it, didn’t want to get started had to really push down hard.

https://drive.google.com/file/d/0B9gFoMRsqnY2WDllbHptQmY1ems/view?usp=sharing

these bits are the sharpest to the touch i’ve felt

View davezedlee's profile

davezedlee

10 posts in 286 days


#6 posted 10-12-2016 11:06 AM

you’re not clearing chips from the hole, so the delay is from the bit having to pulverize the waste into small enough pieces so it can continue

you need to drill a bit, pull the bit out a little so the waste gets carried to the surface, then continue

sorta like taking small drill “stabs”... your bits will dull very quickly with the “he-man” approach

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Woodchuck2010

504 posts in 320 days


#7 posted 10-12-2016 12:35 PM

They act like they are dull bits or maybe have burred leading edge.

-- Chuck, Michigan,

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ksSlim

1204 posts in 2351 days


#8 posted 10-12-2016 01:33 PM

larger bits sharpened for meta lWORK BETTER FOR ME.
If grey cells are working, metal bits are sharpend @ 137 degrees.

-- Sawdust and shavings are therapeutic

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splintergroup

827 posts in 684 days


#9 posted 10-12-2016 01:49 PM

I’m with Dave here. The tip takes a bit to bit to cut through the skin and it (along with the outer lips) is really just for alignment. It is not until the main cutters engage and the flutes begin clearing the waste that your bit really gets going.

View Aj2's profile

Aj2

687 posts in 1259 days


#10 posted 10-12-2016 01:53 PM

I have a set of the lee valley lipped bits.
In a drill press sometimes they will cut a very small round disk out at the beginning of the hole.If it gets trapped between the Spurs then it will prevent the bit from drilling.
So the choice is to remove it or add more pressure.
It took me a few try’s to use my bits properly in a drill press.With a hand drill they are grabby and will self feed.Eps in certain woods.
They have their place for very precise hole making.

Aj

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treesner

166 posts in 426 days


#11 posted 10-12-2016 06:47 PM



you re not clearing chips from the hole, so the delay is from the bit having to pulverize the waste into small enough pieces so it can continue

you need to drill a bit, pull the bit out a little so the waste gets carried to the surface, then continue

sorta like taking small drill “stabs”... your bits will dull very quickly with the “he-man” approach

- davezedlee

thanks, thats kind of what i was thinking too but it jus seems weird that even at the very start of the cut it stops cutting. here’s some photos of when it gets stuck and also at the end when all the chips are clogged up

View treesner's profile

treesner

166 posts in 426 days


#12 posted 10-12-2016 06:50 PM



I have a set of the lee valley lipped bits.
In a drill press sometimes they will cut a very small round disk out at the beginning of the hole.If it gets trapped between the Spurs then it will prevent the bit from drilling.
So the choice is to remove it or add more pressure.
It took me a few try s to use my bits properly in a drill press.With a hand drill they are grabby and will self feed.Eps in certain woods.
They have their place for very precise hole making.

Aj

- Aj2

I’m glad i’m not the only know noticing this grabby nature. i tried to drill a hole in my japanese saw handle and it busted out the end because it was so grabby.
Is this how all brad points are or should i try a different brand. pretty disappointed for how much i spent on these

View treesner's profile

treesner

166 posts in 426 days


#13 posted 10-12-2016 06:51 PM



They act like they are dull bits or maybe have burred leading edge.

- Woodchuck2010

they definitely feel like the sharpest bits i’ve ever owned, holding them on the sides feels like sharp knives and the pointy tip i have to be really careful touching.
i’ll check the leading edge is that the shank of the pointy tip?

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