How to drill a long straight hole????!

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Forum topic by KenBry posted 07-04-2012 01:23 AM 9401 views 0 times favorited 10 replies Add to Favorites Watch
View KenBry's profile


449 posts in 1539 days

07-04-2012 01:23 AM

Guys, i need your help. I am building my bemch and am at the point where I am attaching my legs to my long rails. I bought the benchcrafted. You can see the bolts and barrel nuts that I.bought at the link below.

I need todrill a half inch hole straight through the leg, down the center of the tenon and rail. Total length is 7 1/2”.

How do i do this without screwing it up? Lol

-- Ken, USAF MSgt, Ret.

10 replies so far

View Loren's profile


7967 posts in 2740 days

#1 posted 07-04-2012 01:33 AM

Hand brace and boring bit. Get a mirrored piece of plastic
and drill a hole in the middle and then with the mirror you
can keep the hole straight. Timber framing trick. A power
drill can be used too if you can get the bit to fit the chuck.


View MakinChips's profile


10 posts in 1675 days

#2 posted 07-04-2012 01:37 AM

View KenBry's profile


449 posts in 1539 days

#3 posted 07-04-2012 01:50 AM

I should have said i have a 14” 1/2” drill bit.. I just need to get the hole straight :)

-- Ken, USAF MSgt, Ret.

View MT_Stringer's profile


2656 posts in 2323 days

#4 posted 07-04-2012 02:03 AM

Thinking along the lines of the Kreg Pocket Jig, can you take several pieces of scrap lumber, drill your hole in each, then clamp them in place and use them as a guide for your bit?

-- Handcrafted by Mike Henderson - Channelview, Texas

View FirehouseWoodworking's profile


665 posts in 2365 days

#5 posted 07-04-2012 02:48 AM


My way of doing this would be to cut the leg in half lengthwise. If you have already cut the legs to final size, you will have to glue on a thin piece of wood to make up for the saw kerf, so that you will get the full size leg back.

Then use a half-inch cove bit to route out half the hole in each respective half of the leg. Then glue the two halves back together. You can run a half-inch auger bit down the hole to remove any glue squeeze out if necessary, but if you’re careful during glue-up, you can clean out the bore before the glue hardens.

Good luck. Cheers!

-- Dave; Lansing, Kansas

View MakinChips's profile


10 posts in 1675 days

#6 posted 07-04-2012 02:57 AM

A good source for mirrored plastic is an old cd or dvd disk, just drill right thru the center hole while watching the reflection to keep it square.

View BTimmons's profile


2284 posts in 1577 days

#7 posted 07-04-2012 03:33 AM

When I was drilling dog holes in my bench top, I was fortunate enough to borrow one of these. I think they run about forty bucks at Rockler. You’ll need a corded drill (cordless won’t have enough power) and a lot of muscle. Start your hole slowly, and once it’s established you can really lean into it.

-- Brian Timmons -

View KenBry's profile


449 posts in 1539 days

#8 posted 07-04-2012 09:05 PM

This is how I solved my problem.

Using this drill and bit.

I started the holes in the legs through the mortises. Drilled as deep as I could, then I raised the the part to drill deeper with the drill press. This got me a hole that was square and center where I need it. This allowed me to use this part as a drill guide.

I squared up the leg to the rail

Now I used the hand drill and that monster bit to get the holes into rails nice and straight

There you go, a straight hole deep into the rail.

Thanks guys for helping me get the gray matter working

-- Ken, USAF MSgt, Ret.

View Sylvain's profile


616 posts in 1591 days

#9 posted 07-06-2012 01:49 PM

Kenbry method is perfect …
assuming the two faces of the leg are parallel (the one with the opening of the mortise and the opposite one).

Otherwise you must insure that the hole in the mortise is perpendicular to the face with the mortise opening which is the registering face for the rail.

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

View tyskkvinna's profile


1310 posts in 2078 days

#10 posted 07-06-2012 03:00 PM

Now that’s how you do it!

-- Lis - Michigan - -

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