Irregular countersink - Woodworking Talk - Woodworkers Forum
 1Likes
  • 1 Post By Shop_Rat
 
Thread Tools Display Modes
post #1 of 16 Old 10-19-2016, 08:09 PM Thread Starter
Junior Member
 
Join Date: Mar 2015
Posts: 26
View fenestrane's Photo Album My Photos
Irregular countersink

I got a few countersink bits, but they produce this sort of countersink. They do it in MDF, soft and hardwood, hand-held and in drill press. Any idea what's wrong with them? They are for metal, but my impression was a metal bit would work in wood just as well.
Attached Images
 

Last edited by fenestrane; 10-19-2016 at 08:11 PM.
fenestrane is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 10-19-2016, 08:16 PM
Senior Member
 
Join Date: Sep 2011
Posts: 25,995
View Steve Neul's Photo Album My Photos
Part of the problem is they are not very good countersinks. Then part of the problem is you are drilling them at too slow rpm and pushing too fast. With bad countersinks you have to go real slow and give the bit time to cut.
Steve Neul is offline  
post #3 of 16 Old 10-19-2016, 09:19 PM
where's my table saw?
 
woodnthings's Avatar
 
Join Date: Jan 2009
Location: SE, Michigan
Posts: 27,288
View woodnthings's Photo Album My Photos
Are they 3 flutes?

If they are 3 flutes, they will give you that result. You have to experiment between speed of rotation and feed pressure to get them to work right. Usually slow down the rotation and that works better. Some times increasing the feed pressure will help also....

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
woodnthings is online now  
Sponsored Links
Advertisement
 
post #4 of 16 Old 10-19-2016, 09:48 PM
Nine Thumbs
 
Join Date: Dec 2015
Location: The Very Tip of Lake Michigan
Posts: 333
View Shop_Rat's Photo Album My Photos
Suggest this read:

http://www.rockler.com/how-to/select...lugged-screws/

I prefer a single flute sink in most woods, but I use multiple flute (up to six flutes) in metal. Also pay close attention to angle of the sink. A 60 degree sink can be hateful in soft wood. You probably need an 82 degree sink for wood screws.

And as previously stated, play with speeds and feeds in scrap to "learn" your tool.

Cheers,
andy345 likes this.

Another $000,000,000.02 worth of advice,
Mark
Shop_Rat is offline  
post #5 of 16 Old 10-20-2016, 01:13 AM
Senior Member
 
Join Date: Sep 2011
Posts: 25,995
View Steve Neul's Photo Album My Photos
I bought one of these countersinks. http://www.ebay.com/itm/Snappy-Gold-...AAAOSw8cNUPSwi For the hobbyist unless you hit metal with it should last you the rest of your life. I used a similar one probably a different brand for 20 years and managed to loose it somewhere. It was just getting to the point of needing to be sharpened.
Steve Neul is offline  
post #6 of 16 Old 10-20-2016, 08:51 AM
Senior Member
 
Pineknot_86's Avatar
 
Join Date: Feb 2016
Posts: 1,942
View Pineknot_86's Photo Album My Photos
I countersink with a drill bit that fits the size of the screw head and measure for the depth. I bought some funky countersink bits at HF. They do a decent job but they burn the wood.

A diamond is how coal reacts under pressure.
Pineknot_86 is offline  
post #7 of 16 Old 10-20-2016, 08:59 AM
Senior Member
 
Join Date: Jan 2010
Location: NW Pa
Posts: 2,971
View TimPa's Photo Album My Photos
I use this style (not necessarily this brand) and they work exceptionally well.


http://www.mscdirect.com/browse/tnpl...FdgMgQodUsMKvw
TimPa is online now  
post #8 of 16 Old 10-20-2016, 11:46 AM Thread Starter
Junior Member
 
Join Date: Mar 2015
Posts: 26
View fenestrane's Photo Album My Photos
Quote:
Originally Posted by Steve Neul View Post
I bought one of these countersinks. http://www.ebay.com/itm/Snappy-Gold-...AAAOSw8cNUPSwi For the hobbyist unless you hit metal with it should last you the rest of your life. I used a similar one probably a different brand for 20 years and managed to loose it somewhere. It was just getting to the point of needing to be sharpened.
I have these as well. What I don't like is that wood dust gets impacted between the countersink bit and the drill bit causing two issues:
-the countersink gets off-center
-the drill bit gets tricky to pull out
fenestrane is offline  
post #9 of 16 Old 10-20-2016, 11:47 AM Thread Starter
Junior Member
 
Join Date: Mar 2015
Posts: 26
View fenestrane's Photo Album My Photos
Quote:
Originally Posted by Pineknot_86 View Post
I countersink with a drill bit that fits the size of the screw head and measure for the depth. I bought some funky countersink bits at HF. They do a decent job but they burn the wood.
Quote:
Originally Posted by TimPa View Post
I use this style (not necessarily this brand) and they work exceptionally well.
http://www.mscdirect.com/browse/tnpl...FdgMgQodUsMKvw
My problem with these is that there is no "center piece" to center the countersink around the hole.
fenestrane is offline  
post #10 of 16 Old 10-20-2016, 11:58 AM Thread Starter
Junior Member
 
Join Date: Mar 2015
Posts: 26
View fenestrane's Photo Album My Photos
By the way, this is the countersink I used. Looks cheap, I know.
Attached Images
 
fenestrane is offline  
post #11 of 16 Old 10-20-2016, 12:37 PM
where's my table saw?
 
woodnthings's Avatar
 
Join Date: Jan 2009
Location: SE, Michigan
Posts: 27,288
View woodnthings's Photo Album My Photos
sharpen the dang thing!

If it's "cheap" you have nothing to lose by touching it to the side of a fine stone wheel. You will get the hang of it after a few tries. It's not that difficult to maintain the angle on something that short which you can just rotate without changing your hand position and the angle.
You can also use a flat diamond hone to clean up those worn edges.

A dull bit will give you a poor result.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
woodnthings is online now  
post #12 of 16 Old 10-20-2016, 01:17 PM
Senior Member
 
mikechell's Avatar
 
Join Date: May 2016
Location: Deltona, Florida
Posts: 1,266
View mikechell's Photo Album My Photos
Yep ... your problem is dull edges on that bit. Terribly dull edges !!!
mikechell is offline  
post #13 of 16 Old 10-20-2016, 02:43 PM
Senior Member
 
Join Date: Jan 2010
Location: NW Pa
Posts: 2,971
View TimPa's Photo Album My Photos
Quote:
Originally Posted by fenestrane View Post
I have these as well. What I don't like is that wood dust gets impacted between the countersink bit and the drill bit causing two issues:
-the countersink gets off-center
-the drill bit gets tricky to pull out

or the bit spins in the shank
TimPa is online now  
post #14 of 16 Old 10-20-2016, 02:47 PM
Senior Member
 
TomCT2's Avatar
 
Join Date: May 2014
Location: Central PA
Posts: 1,387
View TomCT2's Photo Album My Photos
............and the work piece is not clamped / fixed.
TomCT2 is offline  
post #15 of 16 Old 10-20-2016, 02:54 PM
Senior Member
 
Join Date: Sep 2011
Posts: 25,995
View Steve Neul's Photo Album My Photos
Quote:
Originally Posted by fenestrane View Post
I have these as well. What I don't like is that wood dust gets impacted between the countersink bit and the drill bit causing two issues:
-the countersink gets off-center
-the drill bit gets tricky to pull out
The only problem I have is the bit is so sharp compared to my old one it's difficult to tell when to stop.
Steve Neul is offline  
post #16 of 16 Old 10-20-2016, 03:18 PM
Senior Member
 
mikechell's Avatar
 
Join Date: May 2016
Location: Deltona, Florida
Posts: 1,266
View mikechell's Photo Album My Photos
Quote:
Originally Posted by Steve Neul View Post
The only problem I have is the bit is so sharp compared to my old one it's difficult to tell when to stop.
With the old one ... "When it starts smoking, it's deep enough."

With the new one ... "I don't understand why I keep 'countersinking' a hole all the way through?!?!"

mikechell is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Countersink Wood screws ? Treedin General Woodworking Discussion 11 10-01-2016 09:39 AM
countersink screw / bolt hardware TomCT2 Project Showcase 22 08-07-2016 01:52 AM
irregular cove on table saw peridigm Design & Plans 4 03-30-2016 10:44 AM
Countersink Bits Crick07 General Woodworking Discussion 15 09-06-2015 08:35 AM

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome