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Hey guys, Got some holes drilled in my tanks but they are like 1mm to small for the bulkheads, Am I able to sand the holes out a little to get them to fit? Also what sort of sandpaper do i use ie: type and grit? Im guessing that id have to use some sort of wet and dry.

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Rule number one

Check drill bit is the right size for bulkhead ?

There's so many posts on here about holes

For bulkheads it's not funny

Two things

One a diamond file round the edges

Two use a smaller drill bit and use it to file the edges

Make sure with above you use water and next time

Use a cutter 10mm bigger than the bulkhead

Sandpaper is no good it takes the sharp edge off

But wont grind it back

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Yeah, Only thing is I didn't drill them and don't have a drill bit and I've already got the bulkheads :(

Didn't you try the BH in the hole when it was cut ?

And if you told them what size BH they should have known

What size to use

I'd be wanting money back or it fixed

FJ

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Rule number one

Check drill bit is the right size for bulkhead ?

There's so many posts on here about holes

For bulkheads it's not funny

Two things

One a diamond file round the edges

Two use a smaller drill bit and use it to file the edges

Make sure with above you use water and next time

Use a cutter 10mm bigger than the bulkhead

Sandpaper is no good it takes the sharp edge off

But wont grind it back

As I said, I didn't drill the holes (The bit was a 32mm to do 25 id bulkheads) I couldn't see anything about what to use to enlargen a hole and google didn't have any consistent info so I asked, I don't just ask without doing some research first champ. Thanks for the info

Edited by DVS969
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well if i drilled them you wouldn't have that problem. now you have 3 options.

1. sand down the bulk head thread so the it would fit. This means that you will loose some thread on the bulkhead

2. use a diamond file and file the hole bigger. Not Glass has a hardness rating of 7 or so, diamond is 9. You need to use any abrasive object with a higher hardness rating than 7.

3. get me over to redrill the holes.

cheers,

dan

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I wouldnt bother try to sand back the glass mate, as it has been said big risk, little reward.

Give Dan a bell mate, he has drilled a heap of tanks for me & fixed prettty much every beginner F-up I have made for me. He will sort you out. easiest option, sublet the job to someone else :):)

Good Luck mate.

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efc, it wasn't meant to be a show off comment mate, but if you want to take it that way then help yourself , (especially from someone who doesn't know what to do).

Why do you think he went for a certain size bulk head? you suggest he go smaller? do you know how that will affect the water flow rate of his system?

enough said

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