New router bit?

[Wongo]

I had to cut 2 litter round table tops last night. I used a router to cut a circle on a piece of MDF. Then I rough cut the table top on a bandsaw before I screwed the MDF template to the bottom side of the table top.

I used a flush trim bit on a router table, with MDF template on top; I cut Q1 and Q3 of the table top. (see picture)

I changed the router bit to a pattern bit, with MDF template at the bottom this time; to finish Q2 and Q4 of the table top. (see picture)

As a result I cut the entire table top with the grain and there was no tear out.

Then I thought would it be good if they made special straight bit with a ball bearing guide at both ends of the cutter? It would be very useful for cutting complex shapes where you the grain is changing direction all the time. You can use 1 router bit instead keep changing between 2 bits.

What do you think? Or does such router bit exist?



http://www.woodworkforums.ubeaut.com.au/attachment.php?attachmentid=81805&stc=1&d=1219819333

[Cruzi]

On 1/4 " shank bits you could just put a bearing and stop under the cutters to do it, not sure about 1/2" shank bits.

[bsrlee]

Lee Valley has had them in their catalog for over a year now. If you ask nicely Scott, I will even give you one of my old catalogs for you to drool over :U:U. Or you can just ask the nice folks at Lee Valley to put one in your next order - have to keep up to date with these things.......

http://www.leevalley.com/wood/page.aspx?c=3&p=51851&cat=1,46168,46171&ap=1

Good nite time reading, but can lead to empty wallet or maxed out credit card syndrome.

[rayintheuk]

Over in the UK they're known as down-shear trimmers. I've got some and they're brilliant (see here (http://www.wealdentool.com/acatalog/Online_Catalogue_Down_Shear_Trim_23.html)).

Ray.

[lesmeyer]

I have the CMT super flush trim cutter (6 degree negative shear). I then purchased a 19mm bearing to fit the 1/2" shank. Now the cutter has bearings on both ends. A very versatile cutter now - always trimming with the grain.
Les

[Wongo]

How bloody beautiful. See, the world is full of clever people. You guys are all champions. Glad I brought it up.


:2tsup::2tsup::2tsup:

Now, let's get a couple of these bastards in my shed. :D

[lesmeyer]

....

Now, let's get a couple of these bastards in my shed. :D
Is that us or the cutters ??:D
Les

[Wongo]

.

[malb]

On sale at woodcraft at the moment.
https://www.woodcraft.com/family.aspx?FamilyID=20258