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Forum topic by daddywoofdawg posted 10-18-2016 05:00 AM 308 views 0 times favorited 6 replies Add to Favorites Watch
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daddywoofdawg

1010 posts in 1041 days


10-18-2016 05:00 AM

Topic tags/keywords: router

I have a router bit question,I’ll use the terms top as the shaft end and bottom as the end of the cutter.
Can you take the bearing off cutter that has a bearing on the bottom and place it on top?I.e pattern routing with a handheld router or is the top bearing bit a different horse?


6 replies so far

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jerryminer

528 posts in 907 days


#1 posted 10-18-2016 07:52 AM

Typically, no. To put a bearing on top, the ID has to match the shank diameter (1/4 or 1/2 are the most common). A bearing on the bottom (cutter) end is typically 3/16 ID and won’t fit on the shank.

But you can get bearings of various sizes from lots of dealers, so you can certainly get a bearing to put on the shank for following a pattern.

Here’s one source: Infinity

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daddywoofdawg

1010 posts in 1041 days


#2 posted 10-18-2016 04:58 PM

Is that what a pattern bit is,just a slip on bearing on the shaft or is there more to it?can’t tell looking online and the nearest store that has any pattern bits is 50 miles round trip

View distrbd's profile

distrbd

2227 posts in 1912 days


#3 posted 10-18-2016 06:08 PM

The bearing rides on the edge of the template,you can have the template on top of the stock or on the bottom, and choose the bit that’s right for it.
There’s also another type of router bit called double bearing Pattern bit, c/w two bearings,one on top and one on the bottom,all you need to do is to flip the stock/template, the feed direction remains the same.
There are a few good youtube videos on these bits:
https://www.youtube.com/watch?v=BJHJM0nl7-o

-- Ken from Ontario, Canada

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splintergroup

829 posts in 688 days


#4 posted 10-18-2016 08:02 PM

The cutter end bearing has a smaller hole (3/16”) that fits over a small pilot and is secured with a screw into that pilot.

The bearing on the collet end is a press fit secured by a ring that locks to the shaft with a set screw. Both bearings share the same outside diameter and are easy enough to remove, but are not interchangeable.

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daddywoofdawg

1010 posts in 1041 days


#5 posted 10-18-2016 08:46 PM

ok,so what keeps the bearing from moving just the press fit and the collet against it?

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jerryminer

528 posts in 907 days


#6 posted 10-18-2016 11:06 PM



Is that what a pattern bit is,just a slip on bearing on the shaft or is there more to it?can t tell looking online and the nearest store that has any pattern bits is 50 miles round trip

- daddywoofdawg

Yes, that makes it a pattern bit. The bearing is held in place by the locking collar—jammed up against the cutter end of the shank.

You can turn almost any router bit into a pattern bit by adding the bearing and collar.(But this is usually done with straight cutters, not profiles, but profiles can be done this way, too).

A “flush trim” bit has the bearing on the bottom, but can also be used to follow a pattern or template.

Or, as has been mentioned, a bit can have a bearing top and bottom.

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