How to drill a 2 ⅝" hole - Woodworking Talk - Woodworkers Forum
 
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post #1 of 16 Old 09-19-2014, 06:51 PM Thread Starter
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How to drill a 2 ⅝" hole

This sounds silly but how do I drill a 2 ⅝" hole in wood? It needs to be flat bottom and I can't find any forester bits or spade bits of that size.

Any suggestions?
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post #2 of 16 Old 09-19-2014, 07:08 PM
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Router with a guide
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post #3 of 16 Old 09-19-2014, 07:12 PM
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How deep? If its shallow enough, you could approximate one using a router inside a circular template.

Regards,
Steve
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post #4 of 16 Old 09-19-2014, 07:16 PM
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Quote:
Originally Posted by sprockets View Post
This sounds silly but how do I drill a 2 ⅝" hole in wood? It needs to be flat bottom and I can't find any forester bits or spade bits of that size.

Any suggestions?
Welcome to the club.

I would probably use a router and a template too.
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post #5 of 16 Old 09-19-2014, 07:24 PM
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Use this to create the hole for your template: http://www.amazon.com/General-Tools-...=circle+cutter

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post #6 of 16 Old 09-19-2014, 07:49 PM
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Quote:
Originally Posted by wericha View Post
Use this to create the hole for your template: http://www.amazon.com/General-Tools-...=circle+cutter
Use that to make a template out of 1/2 inch mdf or plywood or whatever you have handy. Attach a flush trim bit (with a top bearing) to a router and slowly rout out your hole 1/8th inch or so per pass until you reach the desired depth.

Good luck.
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post #7 of 16 Old 09-19-2014, 08:18 PM
where's my table saw?
 
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You may find a hole saw that size....

You can use the circular hole as a guide to just "waste" the material in the center with a straight bit, hand held.

Apparently 2 5/8" IS a standard size:

http://www.blumol.net/pdfs/Disston_f..._SizeChart.pdf

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 09-19-2014 at 08:23 PM.
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post #8 of 16 Old 09-19-2014, 09:33 PM
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For a through hole a Hooke saw would be your best bet. Being that you need a flat bottomed hole, the router is the best way I know of

http://www.amazon.com/Steelex-D1021-.../dp/B0000DD0RB

Oversized forester bits are out there, but you'd need a pretty beefy drill press. And for the love of God, don't try that in a hand drill. Found that lesson out the hard way with a 2.5 inch hole saw...

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etsy.com/shop/projectepicfail
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post #9 of 16 Old 09-19-2014, 10:11 PM
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even a forester bit isnt really flat on bottom. atleast Ive never seen one without a point in the middle.

router is going to be the only flat hole. good plans for a guide, Id think of maybe grabbing a 2" pvc pipe and wrap tape around it till you get the desired diameter (should need about 1/8" of tape)
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post #10 of 16 Old 09-19-2014, 10:59 PM
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Punch a 2ĺ" hole in a piece of 1/2" MDF or plywood with a hole saw to make the template.
Use a 1/2" plunge router bit and a 5/8" bushing to follow the template and route the hole to desired depth.

A flush trim router bit with a shank mounted bearing can get a bit dicey as the entire cutting length of those bits must be exposed before the bearing can provide any guidance. Depending on the depth of the hole, you may need two or more of different cutting lengths to accomplish the job.

John

If I strive for perfection, I can generally achieve good'nuff, If I strive for good'nuff, I generally achieve firewood

Last edited by jschaben; 09-19-2014 at 11:05 PM.
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post #11 of 16 Old 09-19-2014, 11:40 PM
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post #12 of 16 Old 09-20-2014, 01:26 AM
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Usually ships within 3 to 7 months
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post #13 of 16 Old 09-20-2014, 03:32 AM
where's my table saw?
 
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Go Grizzly!

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Originally Posted by MT Stringer View Post
http://www.grizzly.com/products/Larg...t-2-5-8-/D1021

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #14 of 16 Old 09-20-2014, 07:32 AM Thread Starter
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Fantastic!

This is exactly what I was looking for. I searched all of amazon AND grizzly and didn't see this.

Wow this is good!

Thank you!!!

Will
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post #15 of 16 Old 09-20-2014, 11:18 AM
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forstner is not totally flat fwiw. close, but not it. if that matters.
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post #16 of 16 Old 09-21-2014, 04:51 PM
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Quote:
Originally Posted by jschaben View Post
A flush trim router bit with a shank mounted bearing can get a bit dicey as the entire cutting length of those bits must be exposed before the bearing can provide any guidance. Depending on the depth of the hole, you may need two or more of different cutting lengths to accomplish the job.
To get around this, you can just use a spacer between your template and the workpiece. I've just put small blocks at the corners of the template.
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