need to drill a hole

[115johnson78]

I need to drill a hole for the bilge pump discharge. how would be the best way to drill the hole?

The Boat is a 1978 Invader 17.


Thanks for the help

 

[a70eliminator]

Re: need to drill a hole

A 12 ga shotgun! just kidding lol...A typical holesaw makes for a nice clean hole.

 

[115johnson78]

Re: need to drill a hole

A 12 ga shotgun! just kidding lol:.....will a 20ga work LOL do i start from the outside to the in or inside to the out??
I dont want to crack or splinter the glass.

Thanks for the help

 

[duped]

Re: need to drill a hole

I start on the outside, it usually works cleaner. Your thru hull fitting should have a bit of a flange to cover up any roughness you do get. Take your time and use a brand new blade on the hole saw.

 

[115johnson78]

Re: need to drill a hole

Ok Thanks for the help

 

[Jeep Man]

Re: need to drill a hole

Use a sharp holesaw, starting on the outside. When the center guide bit pierces the inside, remove the holesaw and now go from the insde. This will reduce spalling of the gelcoat, leave cleaner edges, and reduce the chance of spider cracks.

 

[seabob4]

Re: need to drill a hole

Use a sharp holesaw, starting on the outside. When the center guide bit pierces the inside, remove the holesaw and now go from the insde. This will reduce spalling of the gelcoat, leave cleaner edges, and reduce the chance of spider cracks.

Just drill from the outside. You'll be fine. Then apply a generous amount of 5200 under the t/hull flange. That will take care of any chips in the gel...

 

[oops!]

Re: need to drill a hole

i fix boats....

tape off the area.

use hole saw.
when drill penetrates the hull......reverse the hole saw...it will chew the gellcoat...after you are thru the gellcoat....go forward with the hole saw gently till you are thru....

insert new bilge drain...and seal INSIde and out with 3m 5200.

 

[115johnson78]

Re: need to drill a hole

i fix boats....

thats understated!!!LOL(i have been reading your hull extention one page at a time.)

Ok Thanx for all of the good advice.

Go IBOATS!!!!!!!!!!!!!!!!!!!!!!

 

[BuzzStPoint]

Re: need to drill a hole

Tape off the area.

Mark your spot, start on the outside and drill into the hull with a hole saw. Once the teeth are at the hull, lightly push to start to scuff into the hull. Do that till you get through the outer part of the gelcoat. Then you can speed it up. Once the hole goes through the inside of the boat you can then come from the inside and drill through.

Use the sealant other recommend for sealing. Use your plastic flange tubes to make it all pretty.