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post #1 of 13 (permalink) Old 05-08-2010, 03:33 PM Thread Starter
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Default Help me find this bit!

I am looking for a 1/4" cutting diameter top bearing pattern/Template bit.

The thickest material I am cutting is 9mm Marine Plywood, if I could do two sheets at once that would be great also but not necassary. I want a narrow bit to get as many copies as possible out of a sheet of wood, and Marine ply is expensive!!!

I want a quality bit, I don't want to worry about the quality of the tool causing any issues, problem is I have not found one for sale yet. If I can't find a 1/4" cut I will go with 1/2", those seem readily available.

I have not picked up my router yet, I was thinking about the Sears kits for around $100, or consider just getting the plunge router without extra bases from Bosch.

Thanks,

Nick
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post #2 of 13 (permalink) Old 05-08-2010, 04:39 PM
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Nick,
If I found one, I would not buy it. To get a 1/4"OD bearing, if you could find a 1/4OD by 1/8"ID (1/16" bearing wall thickness), you'd still only have an 1/8" shank under the bearing spinning a ~1" long 1/4" diameter cutter beneath it.

If you go with a 1/4" shank 1/2" cutter, you can use a 1/2"ODx1/4"ID bearing on the shank with a bearing retainer. This has worked well for me.

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post #3 of 13 (permalink) Old 05-08-2010, 04:40 PM
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I'm not sure you'll find one. The bearing is likely to need IIRC 3/16" to mount on, leaving only 1/32" each side for the race, if you see what I mean.
Fundamentally, any 1/4" bearing is likely to have a central mounting hole that would be too small to safely mount it on a cutter going at the sort of speeds used in a router, so I don't think anyone would do a bearing guided bit this small.

HTH

Peter
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post #4 of 13 (permalink) Old 05-08-2010, 04:46 PM
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Looks like we were typing at the same time Jim !

Cheers

Peter
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post #5 of 13 (permalink) Old 05-08-2010, 05:54 PM Thread Starter
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Looks like you (Both of you) are right. I guess I will go with a 1/4" cutting diameter.

Thanks
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post #6 of 13 (permalink) Old 05-08-2010, 06:50 PM
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Hi Guys

I have a 1/4" shank trim bit with a 1/4" wide cutter and a 1/4" OD bearing on it, it's one of the best ones I have, great to get in the tight pocket cuts, I found it at all places, HD for 15.oo bucks..

http://www.holbren.com/flush-trim-spiral/
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Last edited by bobj3; 05-08-2010 at 08:21 PM.
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post #7 of 13 (permalink) Old 05-08-2010, 06:51 PM
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Quote:
Originally Posted by istracpsboss View Post
looks like we were typing at the same time jim !

Cheers

peter

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post #8 of 13 (permalink) Old 05-09-2010, 07:22 PM
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Quote:
Originally Posted by bobj3 View Post
Hi Guys

I have a 1/4" shank trim bit with a 1/4" wide cutter and a 1/4" OD bearing on it, it's one of the best ones I have, great to get in the tight pocket cuts, I found it at all places, HD for 15.oo bucks..

Flush Trim - Spiral - Holbren
======
We stand corrected ! I wouldn't have thought it feasible but Whiteside can't be wrong.

Cheers

Peter
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post #9 of 13 (permalink) Old 05-09-2010, 10:14 PM
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Quote:
Originally Posted by istracpsboss View Post
We stand corrected ! I wouldn't have thought it feasible but Whiteside can't be wrong.

Cheers

Peter
Peter, I think maybe you are both right. OP was asking for a "top bearing", which I interpret as shank mounted. MLCS also has tip mounted spiral flush cuts.

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post #10 of 13 (permalink) Old 05-09-2010, 10:37 PM
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Hi John

I didn't know MLCS had a true 1/4" one how about a link to that one I'm always looking for deals on bits.

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Peter, I think maybe you are both right. OP was asking for a "top bearing", which I interpret as shank mounted. MLCS also has tip mounted spiral flush cuts.



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