2-3/4" Holes in Plywood - Router Forums
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post #1 of 38 (permalink) Old 04-19-2016, 07:02 AM Thread Starter
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Default 2-3/4" Holes in Plywood

I have to cut a number of 2-3/4" holes in 3/4" plywood. The options I'm considering are a Forstner bit, a hole saw, or an adjustable hole cutter, as in the picture below. The reviews on all of these products are all over the place. The Forstner bits look like they will dull quickly in plywood. Hole saws are slow to cut, but they're pretty durable. I've never used a hole cutter. For the record, I don't know how to sharpen bits, so I'd like to know which bit will last the longest. The hole cutter has a lot of appeal because it is infinitely adjustable. Which way should I go?
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post #2 of 38 (permalink) Old 04-19-2016, 07:08 AM
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Forstner bit will tear at the bottom...
Circle cutter might also...and will grab as grain changes...not really meant for deep cuts...
Hole saw has my vote...

Drill press...?
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post #3 of 38 (permalink) Old 04-19-2016, 07:23 AM
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have the hole cutter...
not so good...

better forstner bits w/ serrated/toothed rims and an in carbide will outlast you...

1 to 4 tooth hole-saws (Lenox or Bosch) are for wood...
mega toothed saws are for metal but will do wood...
these saws are everywhere...

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post #4 of 38 (permalink) Old 04-19-2016, 07:25 AM
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Quote:
Originally Posted by Nickp View Post
Forstner bit will tear at the bottom...
Circle cutter might also...and will grab as grain changes...not really meant for deep cuts...
Hole saw has my vote...

Drill press...?
serrated bit and a backer will put a stop to that...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #5 of 38 (permalink) Old 04-19-2016, 07:28 AM
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Forstner bit is your best bet. You can place a sacrificial piece under your work to prevent tear out.

Hole cutters are clunky to set up and run. You'll get some variation in your diameters. I have one that dulls very quickly. A forstner bit will last a long while.
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post #6 of 38 (permalink) Old 04-19-2016, 07:43 AM
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RotoZip type tool will also work. It's a specialized tool so not something you'd want to buy for a one-time project. How large are the pieces that you need to cut the holes in?
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post #7 of 38 (permalink) Old 04-19-2016, 07:52 AM Thread Starter
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Yes, I have a drill press. There are 12 holes in a 16x20 piece of 3/4" plywood.

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post #8 of 38 (permalink) Old 04-19-2016, 07:58 AM
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fostner...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
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post #9 of 38 (permalink) Old 04-19-2016, 08:06 AM
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Make a template. Rough cut the holes and finish with a flush trim bit in a router.
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post #10 of 38 (permalink) Old 04-19-2016, 08:21 AM
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Quote:
Originally Posted by JIMMIEM View Post
Make a template. Rough cut the holes and finish with a flush trim bit in a router.
I would go this route as well, as I feel it would leave cleaner holes
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