cutting bit movement - Router Forums
 6Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 08-09-2016, 12:38 PM Thread Starter
Registered User
 
Cabbie41's Avatar
 
Join Date: Nov 2010
Country: United States
First Name: Jim
Posts: 42
 
Default cutting bit movement

Guys--
I'm stumped! I set up my Skill plunge router to do some rabbeting on MDF and poplar. The poplar was done with a top-mounted bearing bit, while the MDF used both a spiral down-bit as well as a straight flute 3/8" bit.
The collet was disassembled, cleaned thoroughly, and the tightening was "vigorous". Set the plunge depth to about 1/4" and began the cut. Within the first foot or so of cut the depth had changed to over 1/2", ruining my piece. I've now scrapped three workpieces with the same issue!!
What's happening? The only way I can get this to work is if I limit the cut depth to about 1/16", which is ridiculous and time-consuming.
Any ideas as to what's causing t he problem and how to fix it? The router is old (15-20 years) but not used very much.
Any help would be appreciated!
Thanks
Cabbie41 is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 08-09-2016, 12:53 PM
Registered User
 
vindaloo's Avatar
 
Join Date: May 2009
Country: United Kingdom
First Name: Angie
Posts: 1,651
 
Default

Is the plunge lock not working or is it the bit coming out of the collet?

What's the size of the bit shank and the router collet?

I bought some cheap bits and they turned out to be 12mm and not 1/2", which meant they were loose even with the collet tightened as much as was possible.
bcfunburst likes this.

When everything around you is going to pot, get out in the workshop.
vindaloo is offline  
post #3 of 16 (permalink) Old 08-09-2016, 12:55 PM
Registered User
 
Join Date: Nov 2012
Country: United States
First Name: Richard
Posts: 2,981
 
Default

My guess is the bit is bottoming out in the collet. Try taking it out. Reinstall it the pulled it out about an 1/8" and try it again on a piece of scrap.

"The difference between genius and stupidity is that genius has its limits". Albert Einstein
Shop guy is offline  
Sponsored Links
Advertisement
 
post #4 of 16 (permalink) Old 08-09-2016, 01:06 PM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 24,590
 
Default

use another/different bit on scrap and see it behaves the same way...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
post #5 of 16 (permalink) Old 08-09-2016, 01:13 PM
Honored Member
 
Join Date: Aug 2010
Country: United States
First Name: pat
Posts: 1,053
 
Default

Spirals, like drills, screw themselves into the work.
As such, the cutter is being pulled from the collet.
Especially one as old as yours.
New router or new collet now.
Quillman is offline  
post #6 of 16 (permalink) Old 08-10-2016, 09:24 AM
Registered User
 
Join Date: Feb 2014
Country: Mexico
First Name: Joseph Anthony
Posts: 629
 
Question

Quote:
Originally Posted by vindaloo View Post
Is the plunge lock not working or is it the bit coming out of the collet?

What's the size of the bit shank and the router collet?

I bought some cheap bits and they turned out to be 12mm and not 1/2", which meant they were loose even with the collet tightened as much as was possible.
Same questions and comments here.

Cheers.

Joe
RÖENTGEEP is online now  
post #7 of 16 (permalink) Old 08-12-2016, 02:29 PM Thread Starter
Registered User
 
Cabbie41's Avatar
 
Join Date: Nov 2010
Country: United States
First Name: Jim
Posts: 42
 
Default

Plunge lock is still solid. I tried lifting the bit shank out of the collet by "1/8" or so", but it's a bit of a guess as you're working blind. In any case it didn't work. The bit shanks appear OK, and they're from a set of Craftsman carbide bits and are supposed to be high quality, but I'll measure them anyway just to be sure. I can't afford a new router just now, so a fix is needed.
Thanks for any advice.
Jim
Cabbie41 is offline  
post #8 of 16 (permalink) Old 08-12-2016, 03:04 PM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 24,590
 
Default

new collet...
I trust there is no lubricant on the bit or collet...
Attached Files
File Type: pdf Guide to Router Collets.pdf (163.0 KB, 62 views)
File Type: pdf Collet_Maintenance.pdf (86.2 KB, 53 views)

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
post #9 of 16 (permalink) Old 08-12-2016, 03:23 PM
Moderation Team
 
Cherryville Chuck's Avatar
 
Join Date: Sep 2010
Country: Canada
First Name: Charles
Posts: 14,863
 
Default

Quote:
Originally Posted by Cabbie41 View Post
Plunge lock is still solid. I tried lifting the bit shank out of the collet by "1/8" or so", but it's a bit of a guess as you're working blind. In any case it didn't work. The bit shanks appear OK, and they're from a set of Craftsman carbide bits and are supposed to be high quality, but I'll measure them anyway just to be sure. I can't afford a new router just now, so a fix is needed.
Thanks for any advice.
Jim
Some people use a rubber grommet or an o ring in the botton of the recess to prevent bottoming out. Another way to do it is to take the collet out of the router and stick the bit in it all the way and then mark the shank of the bit. Then you can see how much needs to go in. As long as you are using 100% of the collet there is no advantage to having more shank in the collet.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
Cherryville Chuck is offline  
post #10 of 16 (permalink) Old 08-15-2016, 01:34 PM Thread Starter
Registered User
 
Cabbie41's Avatar
 
Join Date: Nov 2010
Country: United States
First Name: Jim
Posts: 42
 
Default

Just ordered a new collet from ereplacementparts.com ($16.95+ shpg)--I hope that does it. In the interim I'm going to try using a bronze gun bore cleaning brush witih some naptha or acetone to get it good and clean.
I'll let you all know how things turn out.
Thanks for your help!
Jim
Cabbie41 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Router Forums 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Intro and question john spies New Member Introductions 20 12-08-2018 11:08 AM
Planner bit for end grain cutting boards? Barry747 General Routing 20 08-27-2015 03:33 PM
Thread cutting bit wvcowboy Router Bits - Types and Usage 2 09-14-2011 10:04 PM
Router bit for pattern cutting MIKEKELLY Router Bits - Types and Usage 1 11-18-2010 02:16 PM
straight bit / spiral bit (solid carbide bit?) hyiu Router Bits - Types and Usage 3 04-13-2010 09:09 PM

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 On
Refbacks are On

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