Top or Bottom Bearing - Router Forums
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post #1 of 10 (permalink) Old 05-03-2017, 02:11 AM Thread Starter
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Default Top or Bottom Bearing

On a router table set up, what is the more common bottom bearing or top bearing?

Are there any pros on cons for each of the options.

I appreciate stock thickness will dictate the choice in some way.

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John
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post #2 of 10 (permalink) Old 05-03-2017, 05:30 AM
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On the table, I prefer top-mounted bearings with my pattern/template atop the work piece. That way any excess bit is below the table instead of sticking out, menacing my fingers.

edit--*I guess in buying, it might officially be a "bottom bearing bit" that i'm using upside down? This is why I use pictures to order from!!

earl

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post #3 of 10 (permalink) Old 05-03-2017, 06:24 AM
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In a table I'd definitely go with a bottom bearing (so the bearing is on top when inverted in the table) as Earl described, much safer.
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post #4 of 10 (permalink) Old 05-03-2017, 09:43 AM
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They do make bits with both bottom and top bearings and if you are having problems with tear out you can route up to the grain change and flip the part lower or raise the bit to use the other bearing and finish cut the part.

Look at this post and the pictures I added, read my post for an explanation.

http://www.routerforums.com/router-b...0-bit-use.html
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post #5 of 10 (permalink) Old 05-03-2017, 09:54 AM
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The bearing on the top as the cutter is in the table is the most usual way.

Any roundover bit will come that way anyway.
But then if its a straight sided cutter, you have full adjustment on how much cutting edge is shown.

The only cutters i use in the table with the bearing at the bottom are slot or comb joint bits.
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post #6 of 10 (permalink) Old 05-03-2017, 10:47 AM
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Quote:
Originally Posted by MEBCWD View Post
They do make bits with both bottom and top bearings and if you are having problems with tear out you can route up to the grain change and flip the part lower or raise the bit to use the other bearing and finish cut the part.

Look at this post and the pictures I added, read my post for an explanation.

http://www.routerforums.com/router-b...0-bit-use.html
Do you mean one like this?
https://www.amazon.com/MLCS-Bottom-B.../dp/B000LG98TC

Herb
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post #7 of 10 (permalink) Old 05-03-2017, 12:10 PM Thread Starter
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Quote:
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In a table I'd definitely go with a bottom bearing (so the bearing is on top when inverted in the table) as Earl described, much safer.
Very confusing but I think I get it

Thanks

J
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post #8 of 10 (permalink) Old 05-03-2017, 03:26 PM
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Quote:
Originally Posted by John Charnock View Post
Very confusing but I think I get it

Thanks

J
It is really quite simple if the router is hand held the bearing on the end of the bit is down so it is a bottom bearing.
If the router is in a table ,the bearing on the end of the bit is sticking up on the bottom of the bit , and the top of the bit is in the chuck of the router in the table.
Makes perfect sense.
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post #9 of 10 (permalink) Old 05-04-2017, 02:52 AM
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Quote:
Originally Posted by Herb Stoops View Post
It is really quite simple if the router is hand held the bearing on the end of the bit is down so it is a bottom bearing.
If the router is in a table ,the bearing on the end of the bit is sticking up on the bottom of the bit , and the top of the bit is in the chuck of the router in the table.
Makes perfect sense.
Herb
It is simple but also confusing. Did I just say that!!! I think they should say the bearing on the (end) or in the (middle) or both. Would that help???
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post #10 of 10 (permalink) Old 05-04-2017, 01:42 PM
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Originally Posted by hawkeye10 View Post
It is simple but also confusing. Did I just say that!!! I think they should say the bearing on the (end) or in the (middle) or both. Would that help???
what makes it more confusing is that when hand routing the template is on the top of the work and when table routing th template is on the bottom of the work with the same bit. or vice versa with the bearing on the other end. My guess is the routers were originally designed to be hand held, and shapers were for table routing.

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