8" hole saw bit?

[Two12sKnockin]

anyone know where I can get an 8 inch hole saw bit?

how would you go about cutting 8 inch holes in 1/2" thick wood? I wanted to do a hole saw bit to be as exact as possible

 

[Haps]

That is too big for a hole saw that is not industrial grade, takes too much power to turn it in wood. For wood, a jig saw would be best, for plywood. For plastics, I prefer a dremel.
H

 

[Brother Bear]

That is too big for a hole saw that is not industrial grade, takes too much power to turn it in wood. For wood, a jig saw would be best, for plywood. For plastics, I prefer a dremel.
H

 

[jordas]

You can just get a template or a compass to draw the 8" circle and I would use either a saber saw or perhaps a rotozip type of hole saw. Either of these will get you an accurate enough hole after using a bit of caulking to make a good seal around an 8" ducting collar.

 

[alegoblin]

Most larger rental shops will carry up to a 8" hole saw.Otherwise you will have to buy one $50-60 u s.You will also need a big drill to run it preferably one with the big side grip.You will let a 8" hole saw get away from you once.I would'nt recommend a second time.It can break your wrist.Go slow and easy and whatever you do don't get it in a bind.Drill a pilot hole all the way through your wall and use that hole to attack it from both sides.You can also use a sawzall but it will leave a pretty irregular looking hole.

 

[JackTheGrower]

I did this...

It didn't turn out real well since I tried to cut it in the wall in the hardest to reach corner but, you can locate the center of where you want to have the hole.
Put a point tack in a nail then take a string 4 inches or a bit longer and tie it to the nail.

Now wrap the string around a pencil at the 4 inch point or a little more and go around making the hole outline.

Drill ( with a wood spade i think it's called ) some holes so you can get a jig saw in and slowly cut your way around. I found 8 was nice.

I guess you could use a die grinder to really perfect the roundness.

It is much easier to do this on the flat then as i did on the upper wall in the hardest corner to reach.

That's one way..

Just sharing what i did.


Jack

P.S. Buy and wear Safety glasses. Really...

 

[geopolitical]

Rotozip.

 

[sickworm]

I'd go with the method Jack mentioned. Ive used 4" and 6" hole saws on my home drill without a side handle and it was pretty rough getting started. It did work, and nicely but I can see an 8" being downright nasty.I hve also used rotozips and found them to be more of a pain than a jigsaw, at least on 7/16" plywood.

 

[lorddankinstien]

Jigsaw FTW!!!!!!

 

[Two12sKnockin]

so i got a jigsaw and then used it and then returned it and used the $ to buy food