Flush Trim Router Bit question

[Claus]

I've recently gotten a new router and I'm starting to collect some bits. In particular, I'm looking for a flush trim bit and have a few questions.
There seem to be several variations and size combinations, how do you match the size for a particular use? I'm looking for one with the bearing on the shank end to use when following a template. What's a good all-around width and length for the cutter? I realize that I could get different sizes for specific applications (various depths of cut,etc) but would rather start with something multipurpose, if there is such a thing. What would be 'too small' or 'too big' for a given application ? Some are labeled for use with a plunge router and some with a table, what's different with those ?
The first use would likely be to route out a space to add the plate to a new router table that I'm building.

Thanks for any advice you could give me,

Claus

 

[Bas]

There are four things to consider:
Size of the bearing. Large bearings will not follow tight curves/ edges
Length of the bit: If you're using a flush trim bit to clean up a thick (3") tapered leg, you need a long bit
Location of the bearing: A bearing at the bottom is (usually) called a flush trim bit, a bearing at the top a pattern bit. Some bits allow for either a top or bottom bearing.
Type of cutter: There are two, three and four flute cutters, angled cutters, solid carbide cutters etc.

I'd start off with a good flush trim bit with a 1" length cutter and 1/2" bearing. Whiteside and Freud make excellent bits. You'l use this bit a lot, so get a high quality one - you don't want that project you've been working on for two weeks be ruined in half a second because of tearout.

I have one with a 2" cutter, and a bad boy like that is best used in a router table.

For small trim routers, you'll need a bit with a 1/4" shank. But assuming your router can handle 1/2" shanks, get those whenever possible.

 

[Joe Scharle]

Bas, is correct but I think for your first bit of this type you should get one with 2 bearings; both removable, i.e.:

These are from MLCS, but others sell them as well.

http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/bt_flush.html

 

[junquecol]

Bas, is correct but I think for your first bit of this type you should get one with 2 bearings; both removable, i.e.:

These are from MLCS, but others sell them as well.

http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/bt_flush.html

A big plus on MLCS's bits. I have one 1/2" straight bit that has cut over a THOUSAND linear feet of radius in 3/4" plywood. It was for ribs, base and top of a curved desk I built several years ago.

 

[Claus]

Ok, got some goodies ordered and on the way. Thank you all for your input and good advice.

Claus