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Router Bits - why three sizes

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Forum topic by hjt posted 07-17-2018 12:31 AM 619 views 0 times favorited 13 replies Add to Favorites Watch
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hjt

900 posts in 3284 days


07-17-2018 12:31 AM

Topic tags/keywords: router bits trim bits

I’m sure there is a reason, and I have my suspicion, but that may not be correct – like the days I married this woman and thought it would be marital bliss!!! That turned out wrong too. But I digress.

All three of these router bits seem to be trim bits, but why three sizes – why would I choose one over the other?

Also, riddle me this – I used the middle sized bit to trim off the little over hang I had when gluing on a piece of what I’ll call “white board” on the face of a shelf. Darn of the bit did not take off a little of the shelve surface too. I guess my hand held trim router was not exactly 90 degrees to the surface. Would you concur?

-- Harold


13 replies so far

View shipwright's profile

shipwright

8086 posts in 2943 days


#1 posted 07-17-2018 01:28 AM

Larger bit, higher cutter speed, smoother cut.
Smaller bit, fits sharper corners.
Good bits are very accurate ….. not so good bits ….. not so much.
Any tool is only as good as the hands that hold it.

-- Paul M ..............the early bird may get the worm but it’s the second mouse that gets the cheese! http://thecanadianschooloffrenchmarquetry.com/

View wuddoc's profile

wuddoc

313 posts in 3863 days


#2 posted 07-17-2018 01:31 AM

hjt

There are most likely several reasons regarding the different diameters if you talk with a tooling rep.

I am aware of two.
Pro: The smaller diameter allows you to get closer in an internal corner cut.
Con: Small diameter cutter and shaft have increased deflection and vibration.

-- Wuddoc

View Desert_Woodworker's profile

Desert_Woodworker

1615 posts in 1360 days


#3 posted 07-17-2018 01:32 AM


Larger bit, higher cutter speed, smoother cut.
Smaller bit, fits sharper corners.
Good bits are very accurate ….. not so good bits ….. not so much.
Any tool is only as good as the hands that hold it.

- shipwright

+1

-- Desert_Woodworker

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alittleoff

541 posts in 1422 days


#4 posted 07-17-2018 01:46 AM

Yep.
A.L.Off

View Rich's profile

Rich

3661 posts in 735 days


#5 posted 07-17-2018 01:49 AM

As mentioned, the smaller bit is good for tighter radiuses. On larger bits, the larger radius reduces the angle at which the blade engages the wood, thereby reducing tear out. That’s why shapers cut so smoothly compared to router bits in general.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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hjt

900 posts in 3284 days


#6 posted 07-17-2018 02:07 AM

Thanks fellas

-- Harold

View Desert_Woodworker's profile

Desert_Woodworker

1615 posts in 1360 days


#7 posted 07-17-2018 02:55 AM


As mentioned, the smaller bit is good for tighter radiuses. On larger bits, the larger radius reduces the angle at which the blade engages the wood, thereby reducing tear out. That s why shapers cut so smoothly compared to router bits in general.

- Rich


+1 I love the closing “why shapers cut so smoothly compared to router bits ” Smooth exit my friend. :)

-- Desert_Woodworker

View BurlyBob's profile (online now)

BurlyBob

5917 posts in 2411 days


#8 posted 07-17-2018 03:09 AM

shipwright +3. Also I’ve found that Whiteside router bits are the best value out there.

View BroncoBrian's profile

BroncoBrian

793 posts in 2104 days


#9 posted 07-17-2018 03:20 AM



shipwright +3. Also I ve found that Whiteside router bits are the best value out there.

- BurlyBob

Yep – they make a bit for everything. Great value. Whiteside is all I buy.

-- I'd like to see a forklift lift a crate of forks. It'd be so damn literal!

View hjt's profile

hjt

900 posts in 3284 days


#10 posted 07-17-2018 03:38 AM

Bronco, having never heard of Whiteside, I went to google, and as I began to type it in the search, up came router bits. https://www.whitesiderouterbits.com/ Neat company! The video of how they produce the bits was impressive – https://player.vimeo.com/video/42220700.

So should I assume your are a Denver Bronco fan??

-- Harold

View Rick S.'s profile

Rick S.

10570 posts in 3178 days


#11 posted 07-17-2018 08:41 AM



Larger bit, higher cutter speed, smoother cut.
Smaller bit, fits sharper corners.
Good bits are very accurate ….. not so good bits ….. not so much.
Any tool is only as good as the hands that hold it.

- shipwright

BINGO! On The Money Shipwright!

Rick

-- (Rick S.)... "Don't Worry About What People Think! They Don't Do It Very Often Anyway!"

View Woodwrecker's profile

Woodwrecker

4191 posts in 3721 days


#12 posted 07-17-2018 03:45 PM

Whiteside bits are the best to use in my book.

But any bit you have is the best bit to have Harold…lol

View hjt's profile

hjt

900 posts in 3284 days


#13 posted 07-17-2018 04:16 PM

Roger that, WoodWrecker!!

-- Harold

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