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Drill press mirrored hole jig

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Forum topic by squarehippo posted 396 days ago 970 views 0 times favorited 10 replies Add to Favorites Watch
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squarehippo

16 posts in 641 days


396 days ago

Topic tags/keywords: drill press jig mirrored holes

I’m looking for the best way to drill a hole in the same location on opposite sides of a piece of wood. (I’m using a forstner bit and I don’t want the holes to go all the way through. Think wheel wells on a car.) Surely someone has come up with some sort of equidistant, opposite side, centered on the bit, stop block thingy. Thanks!


10 replies so far

View bondogaposis's profile

bondogaposis

2491 posts in 984 days


#1 posted 396 days ago

Are these wheel wells 1/2 holes? You could clamp or temp glue the 2 pieces together like a book match and drill the holes for both sides at once.

-- Bondo Gaposis

View KCConst's profile

KCConst

29 posts in 532 days


#2 posted 396 days ago

How far apart do the holes start and how far off an edge? You could drill a hole through a solid block that is an inch or so wider than the width of your car. Then cut out a through the same width of the car creating a square “u” Clamp the now “U shaped” block where you would have 2 holes to serve as guides for starting the wheel wells. I’ll try to draw something up if its unclear.

-- "Don't let what you cannot do interfere with what you can do" Wooden

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squarehippo

16 posts in 641 days


#3 posted 396 days ago

Actually, wheel wells are just an example. In this case, I’m trying to drill a hole into the top of a board one inch in from either end. But the problem is the same…how to set up a stop that measures the exact same distance from the right and the left side of the bit. Currently, I use a long, thin scrap, drill a hole at one end, and then cut it to the length where I want the stop positioned. That way I can set my stops at the same distance on the right and left side of the bit. The problem is that it’s not a very flexible solution since I have to cut a new one for every distance I work with. But thanks for the ideas!

View KCConst's profile

KCConst

29 posts in 532 days


#4 posted 396 days ago


Would something like this work?

-- "Don't let what you cannot do interfere with what you can do" Wooden

View REO's profile

REO

603 posts in 707 days


#5 posted 396 days ago

make a plug that will fit the hole snuggly. drill a pocket in a peice that will clamp on the drill press table. line up the pocket with the bit by clamping it in place while it is positioned in the hole. drill the first hole on one side of the piece. insert the plug in the guide and place the work piece over the plug. drill the second hole.

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squarehippo

16 posts in 641 days


#6 posted 395 days ago

KCC, here’s an image that shows what I’m trying to do. REO, that would definitely work, thanks. Though, I was hoping to find something that’s adjustable. I did find a self-centering vise that is very close to what I’m after. It could be clamped to the fence, centered on the bit and then you just crank the stop where you want it. Both stops would move the same distance on either side of the bit – perfect!

Or I could just measure more carefully.

View shampeon's profile

shampeon

1349 posts in 816 days


#7 posted 395 days ago

Ok, here goes.

  1. Take a regular drill bit and find a nail the same diameter as the bit.
  2. Lock the drill press table down.
  3. Drill into the table insert with the bit.
  4. Insert the nail and cut off the head. This is the index pin.
  5. Remove the nail.
  6. Mark the location of the first hole on your blank and drill into it, still with the small bit.
  7. Insert the nail, turn the blank around, and fit the blank on top of the nail.
  8. Drill another index hole; this will be in the same location as the first hole due to the nail being in the index hole.
  9. Use the index holes to center your forstner bit holes.

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."

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squarehippo

16 posts in 641 days


#8 posted 395 days ago

That’s actually a great solution for doing the wheel wells. I will file that one away. Thanks REO and shampeon! Unfortunately, it doesn’t solve my adjustable stop problem which is what I was really after. As you can see in the picture above, sometimes I want to drill holes on the right and left sides of the box an equal distance from the edge. The picture below is the self-centering vise I mentioned. Now if it were just a bit longer and had flip stops…it would be perfect for well wells, box hinges, and pretty much anything else where you wanted to drill mirrored holes.

View KCConst's profile

KCConst

29 posts in 532 days


#9 posted 394 days ago

I see.. you had me on “Opposite side” , “wheel wells on a car”

-- "Don't let what you cannot do interfere with what you can do" Wooden

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squarehippo

16 posts in 641 days


#10 posted 394 days ago

Yeah, I probably should have used a better example in the beginning. The self-centering stops would be perfect for the way I’ve been drilling wheel wells…it never occurred to me that there might be more than one way to do it!

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