tank mistake...help!

D

dantheman

New member
whoops

i was plumbing my water tank and accidentally drilled a 2in hole for the 2 in bulkhead (found out it requires a 3 in lol).

now my 3" hole bit wont grip the tank so the hole cant be expanded.

what should i do?

i guess i could just put a 1 in bulkhead w plug or drain and drill the one i wanted on a dif side? i don't really want that.
do yall know of any way i can change the undersized hole to the 3 in i need?

thanks guys.
Dan
 
Use a 3 inch hole saw
 
Install 2" bulkhead and cap it off (make a new 3" hole somewhere else). Or, by hand, turn the 3" cutter (over the 2" hole) slowly until you get a groove started - then slowly cut it out with a drill.
 
Can you fit bot the 2" and 3" on the drill bit at the same time? If so, but both on at the same time (2" inside the 3"). Let the 2" sit inside the hole you already cut, and it will be your guide for the 3".

Again, not sure if your bit will allow for this.
 
Cut the rest of the hole out with a craft knife. May take a little time but you must do penance for your sin. Measure twice cut once still applies to hole as well.
 
option 2.
Screw a block of wood on the inside. Put the screws [self tapping or what ever you call them over there] close to the edge of you cockup hole. You should have 1/2 inch either side of the existing hole. Mark your centre on the block of wood an away you go. easy as just take a little time is all.
 
WASH-IT H.B. said:
option 2.
Screw a block of wood on the inside. Put the screws [self tapping or what ever you call them over there] close to the edge of you cockup hole. You should have 1/2 inch either side of the existing hole. Mark your centre on the block of wood an away you go. easy as just take a little time is all.
Click to expand...

Brilliant! Could have used this tip about a year ago on another project.
 
Get a scrap piece of wood or plastic to use as template. Drill the three inch hole in it. Use duct tape to secure the template in the proper place over the whole. Use that as a guide. Should keep saw from sliding around. Hole doesn't have to be perfect. You have some play because of the size of the gasket. Could also use dremel or other tool with the template. I did the same thing and used this method to remedy it. My tank isn't as flat as yours and my hole wasn't perfect. You have a nice flat plane to work with and should be a breeze.

Another way is to tape a scrap piece of wood over the existing hole and just drill through that, using the wood to hold the saw in place. Same thing either way.
 
im kinda scared to screw it up again if i try to cut it out bigger. the wood spun when i tried the wood method.

so im wondering if theres any downside to just plugging it up and drilling hole on the other side...i found a bulkhead that fits it.

Do more bulkheads mean more potential leaks or would this work just fine?
 
dantheman said:
im kinda scared to screw it up again if i try to cut it out bigger. the wood spun when i tried the wood method.

so im wondering if theres any downside to just plugging it up and drilling hole on the other side...i found a bulkhead that fits it.

Do more bulkheads mean more potential leaks or would this work just fine?
Click to expand...

If you're uncomfortable doing it then plugging it will be fine. It won't leak at all.
 
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