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Reply by rimfire7891

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Posted on How do I drill a VERY precise hole?

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rimfire7891

123 posts in 1530 days


#1 posted 993 days ago

Hi LC,

Most of the above suggestions will work fine if you are working with steel or other metals. However with wood if you use a guide of some sort to “guide” the drill to where you want the hole. You can use a piece of maple to make a guide or if you have lots of holes then a piece of steel would work best as you won’t wear the guide out as quickly. Maple drills well with sharp tools and the bit doesn’t have tendency to follow the grain.

To make a wood guide drill the holes first at the linear spacing you want between the two hinges and then glue a strip of wood along side of the holes to act like a fence to position the guide on the side of the box. Much easier to sneak up with fence to the holes than drill the holes in the right position in relation to the fence. You could incorporate stops on one end of you guide block so you holes are positioned where you want them in relation to the end of the box. Clamp your guide to your box and drill the holes with a brad point the correct size. You can make you own brad point drill from a regular twist drill, use a disc grinder with 1/16 thick cutoff disc and copy the pattern from larger store bought brad point. A deft hand helps, if you screw-up cut the sore end of the drill and start again, HSS twist drills are cheap. Clamp the drill bit in a vice and shape the business end until you happy with the outcome.
Drill the holes in you jig on your drill press and use a hand power drill to drill there holes in your box. Higher speed work better for smaller drill bits. A stop on the drill helps get the depth right. You will know when you have the right speed, too fast and you will likely get smoke.
Using a guide jig means you don’t have to centre punch the hole which is only modestly successful in wood. If you add a fence to both sides of your jig you can use it to drill both the top and bottom portion of your box. That way the spacing will be exact and lined up with the two edges you use as datum.

Hope this helps.

Thanks jb

-- Playing with wood and metal for the last 50 years, driving and building Land Cruisers for the last 40. Experience is what you get when you don't know what you are doing.


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