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Need a bit with 2" radius

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Forum topic by TTalma posted 02-25-2019 09:07 PM 488 views 0 times favorited 10 replies Add to Favorites Watch
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TTalma

12 posts in 3202 days


02-25-2019 09:07 PM

I am making a bunch of parts that are made from 4” squares, One half is rounded.

I would like a router bit that has a 2” radius (Or close) I can run along the length to get the rounded portion, I can clean up the transitions if needed. And the bit only has to have a portion of the radius and I can do it in several passes.

I will be doing this on a 4th axis. Currently it takes about 20min to make the rounded portions, there are 2 on each block + plus the other pattern work it is taking about 1 hr to make each part. 40 min of which is the rounded portions.

The circle portion doesn’t have to be exact, but should look close, and feel good when touched.

Does anyone know where I can get a bit, or if there’s part of a bit that has the right radius?

Thanks!

-- There's only 10 types of people in this world. Those who know binary, and those who don't.


10 replies so far

View John Smith's profile (online now)

John Smith

2015 posts in 673 days


#1 posted 02-25-2019 10:32 PM

. . .

-- I am a painter. That's what I do. I paint things --

View CaptainKlutz's profile

CaptainKlutz

1892 posts in 2004 days


#2 posted 02-25-2019 10:42 PM

Hmm,
Doubt you find a standard quarter round router bit larger than 1-1/2” radius. Typical limit on router is ~3-5/8” diameter cutter; with 1/2 Colet, this leaves ~3” cutting diameter or 1-1/2 radius? Several folks have the 1-1/2” radius if want to use router?

Have seem 2” radius quarter round cutter head for shaper, but they are made to order.

If you want to shorten your CNC machining time, why not trim the corner of block off with a table saw first? Set blade for 45 degrees and whack corner off first. This would leave mostly the transitions to make round?
If you have a lot to produce, make 3 cuts on table saw. (2) at 60 degrees to reduce transition bulk, and (1) 45 degree to remove bulk at middle point. Could figure out saw cut dimensions in CNC CAD program really easily.

Best Luck.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View TTalma's profile

TTalma

12 posts in 3202 days


#3 posted 02-26-2019 02:14 PM

I am currently roughing out on a band-saw, (the final shape doesn’t allow for a table saw) After the rough out, enough material is gone that I can run a roughing pass with a 1/2” ball nose, takes about 3.5 min, then go straight to the finishing pass.

My spindle accepts an ER32 collet, so I can use a cutter with a 3/4” shank.

I didn’t think there would be a 1/4 round with a 2” diameter. an 1/8” round, or 1/16” round would work fine.

I was thinking maybe even something like a crown molding cutter where I just use part of it.

I have sent a drawing out for quote for a custom bit at 1/8 round. The prices coming back are around $400 each. I was hoping for something a little cheaper, but may just need to go that route.

-- There's only 10 types of people in this world. Those who know binary, and those who don't.

View waho6o9's profile

waho6o9

8770 posts in 3087 days


#4 posted 02-26-2019 02:39 PM

Maybe find a cabinet shop with a shaper?

Best of luck.

View rcs47's profile

rcs47

210 posts in 3639 days


#5 posted 02-26-2019 03:29 PM

Carbide Processors offers a service to make cutters to order (they have a phone number to see if the bit you want is possible):

http://www.carbideprocessors.com/router-bits/

This is just one, there should be other manufacturers that can do the same.

I don’t know how many you will be cutting. Maybe they can make a steel bit if you only have a few to cut to save a few $.

-- Doug - As my Dad taught me, you're not a cabinet maker until you can hide your mistakes.

View DS's profile

DS

3301 posts in 2930 days


#6 posted 02-26-2019 04:53 PM

CMT has one with a bearing…

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View ArtMann's profile

ArtMann

1435 posts in 1326 days


#7 posted 02-26-2019 09:00 PM

I agree with John Smith.

View Bill Berklich's profile

Bill Berklich

906 posts in 898 days


#8 posted 02-27-2019 12:52 PM

+1 on finding a shop to do it. You’d be looking for a production shop that can/has/does/makes commercial bar tops. The guys out by me are pretty reasonable.

-- Bill - Rochester MI

View DS's profile

DS

3301 posts in 2930 days


#9 posted 02-27-2019 02:56 PM


I would like a router bit that has a 2” diameter (Or close)
—snip—

- TTalma

Am I understanding this correctly? 2” Diameter = 1” Radius… not too difficult.
2” Radius, (4” Diameter), on the other hand, that is a bit unwieldy.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View John Smith's profile (online now)

John Smith

2015 posts in 673 days


#10 posted 02-27-2019 03:07 PM

it would be nice if OP can post a drawing, sketch or photo of the
finished parts or pattern in question – to receive more accurate feedback.
we are only “assuming” that you are working with wood products ?
will the finished project be clear-coated or painted ??
This is the bit that I have – and it is a NIGHTMARE to use in a hand-held router.

for clarification: you say your pieces are “made from 4” squares”.
which could mean they are more or less thicker than 4”.
if they are four inch “cubes” then they are 4×4x4” ~ is that correct ?

.

-- I am a painter. That's what I do. I paint things --

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