Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-26-2020, 09:41 PM   #1
Senior Member
 
City: Norfolk, VA
Vessel Name: Slow Bells
Vessel Model: Marine Trader 38
Join Date: Nov 2013
Posts: 311
drill bits

I need to drill out a frozen bolt on my Westerbeke 4.4kw generator. It's the bolt that a bracket pivots around to tension the belt. I expect to go through several drill bits in the process, and I was wondering if you guys sharpen your old bits or just buy new ones at the hardware store? Thanks.
__________________
Advertisement

seattleboatguy is offline   Reply With Quote
Old 11-26-2020, 09:48 PM   #2
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 6,722
I buy new but also keep the old for wood.
__________________

__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is online now   Reply With Quote
Old 11-26-2020, 10:01 PM   #3
Senior Member
 
City: Ft. Lauderdale, Florida
Join Date: Apr 2020
Posts: 108
I'd start the project by buying cobalt drill bits. Good luck.
PPandE is offline   Reply With Quote
Old 11-26-2020, 10:24 PM   #4
Guru
 
HopCar's Avatar
 
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 4,730
Try to find left hand twist drills. You may find the bolt turning out as you drill it.
Watch this video. It has some great ideas for keeping the drill centered.
__________________
Parks Masterson
HopCar is offline   Reply With Quote
Old 11-26-2020, 10:29 PM   #5
Senior Member
 
Olebird's Avatar
 
City: Guntersville, Al
Vessel Name: StarLite
Vessel Model: Mainship 30 Pilot II - 2003
Join Date: Aug 2019
Posts: 376
Drill bit sharpener is one of most valuable tools on the bench. Keep em sharp, tempered, with a good cutting oil - much easier.
__________________
Murphy was an optimist!
All else fails, read the directions!
Web - This Little "STARLITE" of MINE!
Olebird is offline   Reply With Quote
Old 11-26-2020, 10:43 PM   #6
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 11,724
Impressive video Parks. No BS, just "this is how it`s done". The OP won`t have the luxury of the job on a bench, but he`s off to a flying start. I had a friend who was a toolmaker on top of fitter and turner, watching someone with real expertise with metal is a treat.
__________________
BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
BruceK is offline   Reply With Quote
Old 11-26-2020, 11:02 PM   #7
Guru
 
C lectric's Avatar
 
City: Gibsons, B.C.
Vessel Name: Island Pride
Vessel Model: xxxx
Join Date: Oct 2007
Posts: 3,187
If there is enough thread in the hole to use another bolt then that bolt could be drilled to centre the bit long enough to start the pilot hole in the broken bolt.
I have made guide plates of 1/4 steel to align the bit properly so it drills on centre if there is/are another couple holes nearby to hold the guide plate.

I agree about the reverse twist bits and have had success with those on a number of occasions. Sometime even though broken the remained is loose or loose enough for the reverse bit to back it out.

There is a tool called a combined pilot and countersink tool used usually on a lathe but also in drill press operations. The pilot part is quite a bit smaller than the body . These a quite short tools, HARD, and if used carelessly can break.
High speed and coolant for the pilot part just to get the hole started in the broken bolt. Once done then the other bit can be used.

Try using a dremel with a small stone that can reach in to grind a flat spot so the drill bits, which ever you use has a flat area to start on. Otherwise the bit is going to wander.

I use new bits in cases like this. I am reasonably good at resharpening bits but no where near good enough for this. And yes a cobalt bit is just a little bit better than the usuall HSS.

And try to find a GOOD penetrating oil to hopefully help with the broken bolt part.
Kroil , is good.
C lectric is offline   Reply With Quote
Old 11-27-2020, 07:10 AM   #8
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 22,690
I broke a lot of drill bits like many.

Then I bought a small set of left twist, Irwin brand cobalt drill bits and they even drilled broken taps nicely.

Best I have used by far!
psneeld is online now   Reply With Quote
Old 11-27-2020, 07:30 AM   #9
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 21,337
https://www.lowes.com/pd/Drill-Docto...E&gclsrc=aw.ds

Makes a great present!
FF is offline   Reply With Quote
Old 11-27-2020, 09:30 AM   #10
Guru
 
Cigatoo's Avatar
 
City: Narragansett Bay
Vessel Model: Grand Banks 36
Join Date: Sep 2016
Posts: 1,116
Quote:
Originally Posted by psneeld View Post
I broke a lot of drill bits like many.

Then I bought a small set of left twist, Irwin brand cobalt drill bits and they even drilled broken taps nicely.

Best I have used by far!
I have 2 sets of Irwin’s.
__________________
Charlie0
Cigatoo is offline   Reply With Quote
Old 11-27-2020, 11:57 AM   #11
Senior Member
 
City: Norfolk, VA
Vessel Name: Slow Bells
Vessel Model: Marine Trader 38
Join Date: Nov 2013
Posts: 311
HopCar's video and FF's bit sharpener were both pretty cool. Thanks very much. Fortunately, I don't have to worry about ruining threads deep inside a shaft. Both ends of my nut and bolt are visible, though not easy to attack. It is the shaft in the center that has welded itself with corrosion to the belt tightening bracket. I may have to move the generator to get at it, which will not be easy, but I think I can eventually get it off of there. Thanks for the feedback.
seattleboatguy is offline   Reply With Quote
Old 11-27-2020, 01:15 PM   #12
Guru
 
ancora's Avatar
 
Join Date: Dec 2007
Posts: 3,803
As an apprentice, I was told by my mentor to never refer to a drill as a "bit." It is a drill.
ancora is offline   Reply With Quote
Old 11-28-2020, 06:26 AM   #13
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 21,337
While taking apart stuff will work with any drill that survives , some holes need to be structural.

A new bit will drill a round hole the size of the drill bit , but a hand sharpened bit will drill a larger hole as eyeballing the drill center is near impossible.

The drill bit sharpener system centers the drill, so it drill the size hole you planned on.
FF is offline   Reply With Quote
Old 11-28-2020, 06:31 AM   #14
TF Site Team
 
Bacchus's Avatar
 
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 4,483
Quote:
Originally Posted by ancora View Post
As an apprentice, I was told by my mentor to never refer to a drill as a "bit." It is a drill.
I've heard that opinion before but have never seen anything to substantiate it other than " I knew someone".
Completely contrary to what my mentors told me and I find in "print" anywhere.
Got any confirming evidence?
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
Bacchus is offline   Reply With Quote
Old 11-28-2020, 08:44 AM   #15
Senior Member
 
friz's Avatar
 
City: Florida
Vessel Name: Chez Reagan
Vessel Model: Cargile Cutter
Join Date: Jan 2016
Posts: 143
I have a Drill Doctor. Yes it sharpens bits but takes practice. Probably takes much less time to sharpen a bit than driving back and forth to the hardware store.
friz is offline   Reply With Quote
Old 11-28-2020, 09:49 AM   #16
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Join Date: Jan 2013
Posts: 6,175
Quote:
Originally Posted by ancora View Post
As an apprentice, I was told by my mentor to never refer to a drill as a "bit." It is a drill.

If a bit is a drill, then what is the thing with the electric motor and chuck?
__________________
MVTanglewood.com
twistedtree is offline   Reply With Quote
Old 11-28-2020, 10:21 AM   #17
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 6,722
Quote:
Originally Posted by twistedtree View Post
If a bit is a drill, then what is the thing with the electric motor and chuck?
Hmmm, how do you explain the phrase, " Brace and bit"?
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is online now   Reply With Quote
Old 11-28-2020, 10:23 AM   #18
Senior Member
 
Island Cessna's Avatar
 
Join Date: Feb 2011
Posts: 213
drill bits

Quote:
Originally Posted by twistedtree View Post
the thing with the electric motor and chuck?

Like most trades, machinists have a lingo dedicated to the trade. The old time journeyman machinists I worked with called that thing a “drill motor”.
Island Cessna is offline   Reply With Quote
Old 11-28-2020, 10:24 AM   #19
Senior Member
 
City: Here and there
Join Date: Oct 2019
Posts: 137
Quote:
Originally Posted by twistedtree View Post
If a bit is a drill, then what is the thing with the electric motor and chuck?
That explains it! I know a very experienced guy who always called it a “drill motor.”
Porgy is online now   Reply With Quote
Old 11-28-2020, 10:37 AM   #20
Guru
 
Portage_Bay's Avatar
 
City: Coupeville Wa.
Vessel Name: Pelorus
Vessel Model: Californian 42 LRC
Join Date: Oct 2015
Posts: 1,093
Quote:
Originally Posted by Porgy View Post
That explains it! I know a very experienced guy who always called it a “drill motor.”

I learned the correct terms are drill motor and drill bit. Shortened for convenience to drill and bit.
__________________

__________________
CRS. Can't remember sh!t. My dad uses to say that. As I stare 70 in the face... Oh, what were we talking about?
Portage_Bay is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 02:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×