Spade Bit for Cutting Hole?

Boating related questions,small projects, custom work and talk go here.
fish4thriLLs
Posts: 89
Joined: 13 Jul 2011, 16:47
Location: Cecilia, KY
Contact:

Spade Bit for Cutting Hole?

Post by fish4thriLLs » 08 Sep 2011, 06:20

I'm considering using a 1" spade drill bit(made to use on wood) to cut out the hole in the side of my Lowe Big Jon for my bilge pump discharge. I've read that any tool used to drill/cut wood can lots of times be used on aluminum as well.

Anyone ever tried this? Do you think it would work okay?

Thanks everyone for your replies.
1980 Lowe Big Jon 1648
1980 Mercury 25 HP OB w/tiller steering
Bow Mounted Minn Kota Endura 36 Troll M.
Top Speed: 27+ mph

Xtremeboats
User avatar
Captain Ahab
Posts: 10599
Joined: 13 Dec 2006, 00:13
Location: Bucks Co., PA
Contact:

Spade Bit for Cutting Hole?

Post by Captain Ahab » 08 Sep 2011, 06:30

I have and it does not work well - it will tear and catch in the metal

You should use a hole saw - or, if you are like me and work fast and sloppy:

1. trace in marker the spot where you want to put the hole

2, Use a 1/4 drill bit, drill on the inside of the line as many times and you can (use a cross pattern to avoid bending the metal);

3. Using a round file, - connect the dots until you get your hole

If you have a nice sharp drill bit it goes really fast with minimal filing
Trying to Fish as often as Jim works :LOL2:

User avatar
BOB350RX
Posts: 482
Joined: 13 Apr 2011, 12:57
Location: NE,Ohio

Spade Bit for Cutting Hole?

Post by BOB350RX » 08 Sep 2011, 06:50

Captain Ahab wrote:I have and it does not work well - it will tear and catch in the metal

You should use a hole saw - or, if you are like me and work fast and sloppy:

1. trace in marker the spot where you want to put the hole

2, Use a 1/4 drill bit, drill on the inside of the line as many times and you can (use a cross pattern to avoid bending the metal);

3. Using a round file, - connect the dots until you get your hole

If you have a nice sharp drill bit it goes really fast with minimal filing
this has to be a pa/dutch/hillbilly thing...lol but it does work, a dremel with a nice sharp carbide burr in it works well also :D just yankin yer chain ahab :D
THIS THING USED TO FLOAT

http://www.tinboats.net/forum/viewtopic ... 21&t=20263, my 82 mirro build

http://www.powerstream.com/wire_size.htm voltage drop, and wire size charts, pretty useful stuff!! not just for 12v either

GTS225
Posts: 305
Joined: 05 Aug 2011, 23:42

Spade Bit for Cutting Hole?

Post by GTS225 » 08 Sep 2011, 06:56

I do believe that "uni-bits" are made out to 1" .

Roger

User avatar
bobberboy
Donor
Posts: 1558
Joined: 05 Apr 2009, 08:37
Location: Minneapolis, Minnesota

Spade Bit for Cutting Hole?

Post by bobberboy » 08 Sep 2011, 07:33

The spade bit will make a hash out of the project. Once the pilot goes through the metal there's nothing to keep the bit centered, the bit begins to wobble and the hole will be a mess. The best is to use a hole saw - they come in sizes up to about 4". You can buy sets or individual saws. If you have to use the spade bit, you should clamp a block of wood behind the hole. That way the point of the bit will remain centered in the wood block as the spade cuts the hole.

User avatar
Captain Ahab
Posts: 10599
Joined: 13 Dec 2006, 00:13
Location: Bucks Co., PA
Contact:

Spade Bit for Cutting Hole?

Post by Captain Ahab » 08 Sep 2011, 09:10

BOB350RX wrote:
Captain Ahab wrote:I have and it does not work well - it will tear and catch in the metal

You should use a hole saw - or, if you are like me and work fast and sloppy:

1. trace in marker the spot where you want to put the hole

2, Use a 1/4 drill bit, drill on the inside of the line as many times and you can (use a cross pattern to avoid bending the metal);

3. Using a round file, - connect the dots until you get your hole

If you have a nice sharp drill bit it goes really fast with minimal filing
this has to be a pa/dutch/hillbilly thing...lol but it does work, a dremel with a nice sharp carbide burr in it works well also :D just yankin yer chain ahab :D

If you use the dremel tool wear eye protection

Image
Trying to Fish as often as Jim works :LOL2:

User avatar
fender66
Moderator
Posts: 6477
Joined: 12 Apr 2010, 17:25
Location: Fenton, Missouri
Contact:

Spade Bit for Cutting Hole?

Post by fender66 » 08 Sep 2011, 10:09

If you have to use the spade bit, you should clamp a block of wood behind the hole. That way the point of the bit will remain centered in the wood block as the spade cuts the hole.
+1. This is the way I've done this successfully. You still have to go very slow and keep the bit straight. A hole saw still will be easier though (I believe).

We want before and after pics too!
Peace,

Chris/Fender66´¯`●.¸.¸¸.●´¯`●.¸><((((º>
Every day should be Fender Day!

Image
2011 TinBoats/BYOB Labor Day Tournament Champion :wink:

User avatar
gouran01
Posts: 355
Joined: 06 Nov 2010, 09:02
Location: Frankenmuth, MI/Browning,IL

Spade Bit for Cutting Hole?

Post by gouran01 » 08 Sep 2011, 11:02

you can get the stepped drill bits at the napa etc for bout 7 bucks. the one I have goes to 1 1/8 ". I bought it for nearly the same purpose but have used it very often since. good bang for the buck.

nomowork
Posts: 1137
Joined: 20 May 2011, 00:42
Location: The wacky west coast

Spade Bit for Cutting Hole?

Post by nomowork » 08 Sep 2011, 12:41

I used a jig saw to cut out the holes for navigation lights.
HAPPILY UNEMPLOYED

User avatar
Derek
Posts: 316
Joined: 18 Feb 2010, 11:17
Location: Sterling, MA

Spade Bit for Cutting Hole?

Post by Derek » 08 Sep 2011, 13:17

stepped bit or hole saw are the correct tool for the job

User avatar
BOB350RX
Posts: 482
Joined: 13 Apr 2011, 12:57
Location: NE,Ohio

Spade Bit for Cutting Hole?

Post by BOB350RX » 08 Sep 2011, 13:54

If you use the dremel tool wear eye protection

Image[/quote]


OUCH!!!!! tell me that not a personal pic????
THIS THING USED TO FLOAT

http://www.tinboats.net/forum/viewtopic ... 21&t=20263, my 82 mirro build

http://www.powerstream.com/wire_size.htm voltage drop, and wire size charts, pretty useful stuff!! not just for 12v either

User avatar
LOWEBIGJON
Posts: 86
Joined: 24 Jul 2011, 21:14
Location: Kingston, TN

Spade Bit for Cutting Hole?

Post by LOWEBIGJON » 08 Sep 2011, 17:02

I have mine run out the back through the hole already in there with 3/4 inch tubing....I would not cut any holes, if I had too I would just use a hook type pipe or tube to go over the back or side..
LOWE 1852
Yamaha 25 HP ELH 2 stroke

wihil
Posts: 681
Joined: 13 Jul 2011, 13:55
Location: The Fox Vally, WI

Spade Bit for Cutting Hole?

Post by wihil » 08 Sep 2011, 18:12

I'd use a knock out, but they're a bit more expensive than a uni-bit.

C
Keepin' the wet side down.

1955 AeroCraft P / 15Hp Johnson

User avatar
Ranchero50
Moderator
Posts: 1652
Joined: 29 Apr 2009, 14:03
Location: Hagerstown MD

Spade Bit for Cutting Hole?

Post by Ranchero50 » 08 Sep 2011, 23:13

Unitbit with a 1/4" pilot hole. Open it up to size, then hit it from the back side to debur the inside. A little squirt of WD40 works wonders for aluminum cutting too.

Jamie

User avatar
devilmutt
Posts: 599
Joined: 20 Mar 2010, 15:00
Location: Austin, MN

Spade Bit for Cutting Hole?

Post by devilmutt » 08 Sep 2011, 23:54

I used a hole saw for the same purpose, worked great.
USMC 88-92
Semper Fi!

My Starcraft Seafarer build http://www.tinboats.net/forum/viewtopic ... 21&t=13674

Post Reply