What size hole saw do I need for 3/4" pipe?

chad22 · Jan 18, 2011

I ordered a 1-1/8" bi metal hole saw off ebay. It should be here by Friday or Saturday. We'll see if that does the trick. I'll let you know how it all works out.

Thanks

Chad

Egon · Jan 18, 2011

[ might be able to force the pipe through the 1" hole but doubt it. /QUOTE]

File:thumbsup:

SandburRanch · Jan 18, 2011

A one inch sanding drum would probably take 0.025" off each side with just a little skill on the operators part.

Delta 17-940 25-Piece Sanding Drum Kit (Contains 3/4 Inch, 1...

k0ua · Jan 18, 2011

SandburRanch said:
A one inch sanding drum would probably take 0.025" off each side with just a little skill on the operators part.

Delta 17-940 25-Piece Sanding Drum Kit (Contains 3/4 Inch, 1...

Yes, that is the route I would have taken I think, or the rat tail file Egon suggested, the new hole saw is gonna be a um....itch to keep centered over the existing hole, and the 1 1/8 hole saw is gonna be a real sloppy fitup for welding this 3/4 pipe in, but oh well live and learn:thumbsup: I wish him great success.

James K0UA

CurlyDave · Jan 18, 2011

If I had to do this, I would attach a plate of mild steel on the side of the previously-drilled piece where the hole saw will exit. That way you get your guide back from the pilot drill.

k0ua · Jan 18, 2011

CurlyDave said:
If I had to do this, I would attach a plate of mild steel on the side of the previously-drilled piece where the hole saw will exit. That way you get your guide back from the pilot drill.

good idea!

James K0UA

David Devuono · Jan 18, 2011

Chad I hope the hole saw has a integrated mandrel or you ordered the mandrel as well. (the part that goes into the drill which the hole saw screws onto.) It is going to be very difficult to enlarge the hole but there are some good ideas above to create pilot hole. Personally I would have just bought some round files. I use them everyday. The advise above regarding speed is important. If you have a drill press put on a low speed. Otherwise 1/2 drills with 500 rpm can be used but hold on tight.

PILOON · Jan 18, 2011

CurlyDave said:
If I had to do this, I would attach a plate of mild steel on the side of the previously-drilled piece where the hole saw will exit. That way you get your guide back from the pilot drill.

I have simply used scrap 3/4" plywood and clamps. Works for me.

lostcause · Jan 19, 2011

the hard part will be getting the pin through the pipe sleeve afterward because of the seam weld in the pipe. if i were going to be welding a sleeve through a tube, i'd use whatever i had around. if you're building a backhoe, i'm assuming you have a torch? use that to make the holes, because machine tool precision isn't needed since you are going to be welding the pipe sleeve in afterward. any inconsistency or gap will be taken up by the weld. since you already ordered a 1 1/8 saw, that will do too, as long as you can get it started since you don't have the pilot hole anymore.

mjncad · Jan 19, 2011

k0ua said:
I am not sure what your situation is, but if you already have a 1 inch hole through the material you are trying to drill, you are going to have trouble getting a 1 1/16 holesaw to drill a hole over this hole. as you have no material for the pilot bit to go into. If you can get the part into your drillpress vise, and chuck up the holesaw into your drill press, perhaps you could get this done, but it wont be easy.

James K0UA

Get yourself a Starrett "Oops Arbor." I've got one and it's been a lifesaver on occasion when I frak up. However, as I recall, it needs at least 1/8" difference in hole sizes to work due to the set on the saw teeth.