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All Replies on Pilot hole + countersink bit for #8 screws--am I crazy?

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View deadherring's profile

Pilot hole + countersink bit for #8 screws--am I crazy?

by deadherring
posted 08-15-2017 06:57 PM


6 replies so far

View Woodknack's profile

Woodknack

11619 posts in 2377 days


#1 posted 08-15-2017 08:07 PM

DeWalt had some very bad quality control issues on their countersinks right now, that could be part of it.

-- Rick M, http://thewoodknack.blogspot.com/

View deadherring's profile

deadherring

63 posts in 1640 days


#2 posted 08-15-2017 08:43 PM

@Rick M: Just to clarify, what I’m saying is when I’ve purchased a #8 countersink/pilot hole combo bit it’s always been 1/8th. Now, they are 11/64 which makes a hole too big for a #8 screw.

View jerryminer's profile

jerryminer

923 posts in 1438 days


#3 posted 08-15-2017 09:15 PM

Lee Valley has these: Countersink bits

(I think they are made by Snappy)

-- Jerry, making sawdust professionally since 1976

View patcollins's profile

patcollins

1685 posts in 2862 days


#4 posted 08-15-2017 09:23 PM

Well 11/64 is the through hole size and not the size hole to use if you want the threads to catch any wood. It sounds like they are now designed for a through hole instead of a pilot hole.

Here is a chart that does a little explanation of the 11/64”, I suppose they assume you will use a screw that is long enough for the threads to engage?

https://www.boltdepot.com/fastener-information/Wood-Screws/Wood-Screw-Pilot-Hole-Size.aspx

View Nubsnstubs's profile

Nubsnstubs

1286 posts in 1727 days


#5 posted 08-15-2017 10:36 PM

If you are using a 2” screw, set you counter sink at 2” . If you’re using 1 1/4”, set it at 1 1/4”. That’s the way it’s designed to be used. It sounds like you are setting the countersink at the top of the bit instead of for the size of the screw your drilling for. Set properly, the taper allows the screw to get a bite, the straight portion allows for a through hole, and the countersink allows the screw head to be flush or hide below any surface you’re screwing into.

  • Drill, countersink and counterbore in one step *

That’s from the description in the second link you posted….............. Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

View AlaskaGuy's profile

AlaskaGuy

4133 posts in 2306 days


#6 posted 08-15-2017 10:39 PM

I don’t know for sure if this is any help but, the chart show 11/64 for tappered bits and 1/8 for straight bit for #8 screws.

https://www.jamestowndistributors.com/userportal/document.do?docId=279

-- Alaskan's for Global warming!

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