Help cutting large holes in 2 1/2" pine

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Forum topic by alumitim posted 03-11-2015 05:06 PM 817 views 0 times favorited 6 replies Add to Favorites Watch
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26 posts in 1619 days

03-11-2015 05:06 PM

Topic tags/keywords: large holes tip jig question

I am trying to cut 7 1/2” holes in a 2 1/2” slab for dog feeders (see my projects). The way I have accomplished this in the past is by several either forstner holes or hole saw holes. Can’t find a jigsaw blade long enough, and don’t know of another way to do it. Any ideas would be greatly appreciated.

-- Tim

6 replies so far

View TheFridge's profile (online now)


9473 posts in 1485 days

#1 posted 03-11-2015 05:26 PM

Make a circle template, cut with a jigsaw, out of ply. Use a 1/2”X1-1/2” top bearing flush trim bit in a router and finish with a 1/2”x1-1/2” bottom bearing flush trim bit.

That’s all I got.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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117091 posts in 3576 days

#2 posted 03-11-2015 05:34 PM

How about making a trammel jig for your router and a long router bit.

-- wood crafting & woodworking classes

View RobS888's profile


2411 posts in 1844 days

#3 posted 03-11-2015 05:36 PM

Remove most of waste with forstner bits.

As TheFridge says use top bearing bit to cut final circle, then use finished part to get further down without template, then turn over and use bottom bearing router bit, the bearing will ride on the finished part of hole.

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

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6715 posts in 2198 days

#4 posted 03-11-2015 05:43 PM

I’d just get some longer jig saw blades and use a circle cutting jig.. simple. I’ve seen 4 and 6 inch blades at the BORG, or you can find them online easily.


-- Brad in FL - In Dog I trust... everything else is questionable

View alumitim's profile


26 posts in 1619 days

#5 posted 03-11-2015 05:47 PM

Thanks guys I appreciate it.

-- Tim

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4727 posts in 2351 days

#6 posted 03-11-2015 06:00 PM

+1 to A1Jim’s suggestion. If you make a through hole for the trammel point you could come in from both sides and not need a long router bit.

-- Bondo Gaposis

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