How to make hole in base of router larger? - Router Forums
 11Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 04-05-2016, 02:05 PM Thread Starter
Registered User
 
Join Date: Mar 2016
Country: United States
First Name: Ken
Posts: 19
 
Default How to make hole in base of router larger?

The holes in the plastic bases of my craftsman 27683 router are just a gnat's eyelash too small in diameter for a standard guide bushing. The larger diameter part of the bushing does not fit in the hole. How can I make the hole a tad larger? Can I use a circle cutter like this one Carbide Tip Adjustable Circle Cutter ? Looks tricky. I do have a drill press.
Since the hole in the router base is stepped, I need to increase the diameter of the larger, stepped part of the hole. I even thought of just scraping it with a razor knife but don't think I can get it concentric this way (does it matter?).

Related question: when using a centering cone, do I adjust the bushing within the router's base hole, or adjust the base on the router?
To adjust the bushing would require that the bushing be a little loose in the hole, which it isn't. To adjust the base would require that the holes for mounting the base have some play in them. They don't.

What am I misunderstanding here?

As I type this I realize that maybe the HF bushings are just a little too big in diameter. I'll have to check them later.

Background.
I also have a Skil 1835 router and the guide bushing fits perfectly in the hole in its base. When I say perfectly I mean without any play, so no way to adjust. The guide bushing is from a set I bought at HF 9 Piece Router Template Guide Set. I also own a base plate with quick change guide bushings. milescraft set This one has a universal plate and the HF guide bushings fit it just fine.

I took the guide bushing to Sears and tried 4 -5 other routers. All have the same problem. I tried the guide bushing from the Sears set, though, and it fit fine in the Sears routers and loose in my universal adapter. craftsman bushing set

So it looks like the Sears guide bushings and router bases are all just a tad smaller in diameter than 'standard.'

Thanks, again, for helping a newbie.
Attached Thumbnails
Click image for larger version

Name:	milecraft base.jpg
Views:	437
Size:	45.8 KB
ID:	202642  

Click image for larger version

Name:	sears bushings.jpg
Views:	359
Size:	22.2 KB
ID:	202650  

Attached Images
   

Last edited by kglade; 04-05-2016 at 02:15 PM. Reason: added pictures
kglade is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 04-05-2016, 02:33 PM
Registered User
 
PhilBa's Avatar
 
Join Date: Sep 2014
Country: United States
First Name: phil
Posts: 1,046
 
Default

So, you are talking Porter-Cable style bushings. The flange is 1 3/8" diameter while the threaded part is either 1 1/4" or 1 3/16" (I've seen both sizes listed). I think it would be very tricky to get a hole saw to make a perfectly concentric enlargement. Concentric isn't critical but you do have to get the bushing in. If there was a 3/32" rabbet bit, you could do it but I didn't see one with a quick look. Frankly, I would just make a new base from 1/4" lexan and use 2 forstner bits (1 3/8", 1 1/4") to make the holes. With a pilot hole you can make them concentric and with oversized mounting holes you can center the base. I've done that a number of times.

On the centering question - you loosen up the screws holding the base and move it to center the bushing that is attached to the base. Get it centered and then tighten down the screws.
TWheels likes this.

Measure twice, cut once and CROSS OUT THE WRONG MARKS.

Last edited by PhilBa; 04-05-2016 at 02:35 PM.
PhilBa is offline  
post #3 of 16 (permalink) Old 04-05-2016, 02:49 PM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 24,645
 
Default

fit the current hole w/ a forstner bit exactly...
load that bit into the DP...
fit the base to the bit and clamp the base to the tanle...
change fostner bits to the desired hole you want w/o moving the base plate...
bore your hole...
if you want a shouldered hole to comp/place the ring change fostner bits again and cut the shoulder...
TWheels, Gaffboat, TenGees and 5 others like this.

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  
Sponsored Links
Advertisement
 
post #4 of 16 (permalink) Old 04-05-2016, 06:47 PM
Registered User
 
vchiarelli's Avatar
 
Join Date: Mar 2012
Country: Canada
First Name: Vince
Posts: 3,456
 
Default

Ken - if there is no play in the base's screw holes, they are probably countersunk. They need to have a flat bottom which allow the base to move around the screw. I'm not sure why base plates are made like that, but I experienced the same issued with my Porter Cable 690 - countersunk holes. I checked my local woodworker store and the new replacement plate from Porter Cable still has countersunk holes.

My old Craftsman router also has countersunk holes. My Bosch 1617 does not. I have a cheapie set of guide bushings and found that they did not fit in my PC 690 - the PC690 center hole had a small tab inside that I had to slice off with a utility knife. Not all guide bushings are the same size - slightly off, but just enough to make a difference.

If you don't want to make a new base, you could take a forstner bit and flatten the bottom of the hole on your current base - that should give you enough play to reposition the base as you center the bushing around the bit.
Roy Drake likes this.

Some folks call me Vince - other folks call me...........
vchiarelli is offline  
post #5 of 16 (permalink) Old 04-06-2016, 10:25 AM
Forum Contributor
 
MEBCWD's Avatar
 
Join Date: Jan 2012
Country: United States
First Name: Mike
Posts: 2,950
 
Default

KISS!
Use the universal base plate with the HF guide bushings and don't bother with modifications to the Craftsman base plate.
RainMan 2.0 likes this.

Mike
Your BRAIN Is The Most Important Power Tool In Your Shop. Turn It On Before You Turn On Any Other Power Tool.
A Disability Is Only A Disability If You Let It Be One
MEBCWD is online now  
post #6 of 16 (permalink) Old 04-06-2016, 11:10 AM Thread Starter
Registered User
 
Join Date: Mar 2016
Country: United States
First Name: Ken
Posts: 19
 
Default

@mebcwd

Great idea. I overlooked the obvious. I was too focused on 'fixing' the problem with the bases that I forgot that the real problem was how to use the router with a template.

Thanks!
kglade is offline  
post #7 of 16 (permalink) Old 04-06-2016, 01:02 PM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 24,645
 
Default

if you want to change a countersink to a counterbore fit the current countersunk hole w/ a countersink bit that exactly fits...
load that bit into the DP...
fit the base to the bit and clamp the base to the table...
change the CS bit to fostner bit of the desired sized hole you want w/o moving the base plate...
bore your counter bore hole...
or move to the head of the class and go w/ a counter bore bit from the git go....

.

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 #8 of 16 (permalink) Old 05-22-2016, 06:10 AM
Honored Member
 
harrysin's Avatar
 
Join Date: Jan 2007
Country: Australia
First Name: Harry
Posts: 14,253
     
Send a message via Skype™ to harrysin
Default

Unfortunately I only understand English!

Harry



Nothing but heaven itself is better than a friend who is really a friend. - Plautus






harrysin is offline  
post #9 of 16 (permalink) Old 05-23-2016, 02:58 AM
Honored Member
 
harrysin's Avatar
 
Join Date: Jan 2007
Country: Australia
First Name: Harry
Posts: 14,253
     
Send a message via Skype™ to harrysin
Default

Have I to assume that I'm not the only one who doesn't understand Stick's post?

Harry



Nothing but heaven itself is better than a friend who is really a friend. - Plautus






harrysin is offline  
post #10 of 16 (permalink) Old 05-23-2016, 04:47 AM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 24,645
 
Default

Quote:
Originally Posted by harrysin View Post
Have I to assume that I'm not the only one who doesn't understand Stick's post?
seems that way Harry...

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  
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
First Benchtop Router Table, get a plate or go bare? silentblackhat Table-mounted Routing 38 05-30-2012 02:30 AM
Model 320.17542 and table routing 46_trap Table-mounted Routing 44 10-16-2011 01:40 PM
7518 router does not move freely in fixed base tgneid Tools and Woodworking 6 09-05-2011 09:24 AM
Hole Pattern on Router Base Avery Table-mounted Routing 6 07-22-2010 12:04 PM
shiis allthunbs Jigs and Fixtures 25 02-24-2010 02:24 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