Semi OT - rabbet bits for 23/32 plywood

[mountaincraft]

Anyone know where to get a rabbet bit (with the cam follower bearing) that cuts 23/32"w rabbets for plywood? I can only find them in full sizes (1/4, 3/8, 1/2, 3/4, etc.), but plywood is pretty much all 23/32" these days..

I could use my CNC for precision rabbets, which I have been doing up until now, but it's kind of a PITA... Would be so nice to just be able to pop a rabbet bit in the router, run it along the edge of the plywood and be done with it...

I'm not rich, so affordable would be nice!

[adze_cnc]

Use a 3/4" (24/32") bit and use a 1/32" spacer to stand it off resulting in a 23/32" cut?

Use an 18mm rabbet bit and call it close?

[tfrank]

Why the need for the follower bearing if you're using in the CNC?

I have a couple of bearing-less versions that I frequently used on the router table or handheld router (against a guide fence) that now get used primarily in my CNC. They are:

Freud 16-116
CMT 811-682

Presumably, from the attached, Whiteside has a couple varieties as well. I keep this table in my useful router/cnc files, but I don't own any of these particular bits.

[mountaincraft]

Why the need for the follower bearing if you're using in the CNC?

I have a couple of bearing-less versions that I frequently used on the router table or handheld router (against a guide fence) that now get used primarily in my CNC. They are:

Freud 16-116
CMT 811-682

Presumably, from the attached, Whiteside has a couple varieties as well. I keep this table in my useful router/cnc files, but I don't own any of these particular bits.

You misread my post.. I'm trying to avoid using the CNC as that is a major PITA in comparison..

With the cam follower, I only have to cut the panels to size on my table saw, and then just run the router along the edge (what, 10 seconds or so?).. I can just put it in one of the old sears or black and decker routers I have sitting sround, set the depth and go. then once set up, just set it aside and use that router just for doing that..

much easier tan huffing a full sheet of plywood onto the table, writing a new program for whatever size panels I need (and always several different sizes), then doing the hold downs, puling it off, separating it from the main sheet, cleaning up tabs, then cleaning up the table, etc. etc..

[mountaincraft]

Use a 3/4" (24/32") bit and use a 1/32" spacer to stand it off resulting in a 23/32" cut?

Use an 18mm rabbet bit and call it close?

I'm not understanding the spacer idea, especially since I need a slightly 'smaller' bearing...

But the idea that there would be a metric equivalent is something I hadn't considered.. definitely something to look into..

I could always just make the panels slightly larger, then use the 3/4, and then use a flush trim bit afterwards, but that involves another bit, additional router (if I want to leave it all set up for repeat usage), and another operation..

off to look into a metric alternative...

[mountaincraft]

Okay, the 18mm will work (it's only .009" bigger)..

Tools Today tool sells an Amana collar set for metric sizes..

I'd have to call them to find out for sure, but I think I'd have to buy their SAE sized bit/collar set (like $80-90) and then their metric collar set for it ($30-35)

Kinda pricey, but might be worth it anyway.. They also have an insert version, that I'm sure costs a lot more)

Anyway, thanks! Now I'm on the right track!

[mountaincraft]

I 'think' this is what I need!

SAE Rabbet bit ($42) https://www.toolstoday.com/v-6178-49340 ... mfjun1HgCE

18mm Rabbet Bit ($37) https://tools.toolstoday.com/woodworkin ... pYf5xekDB8

[mountaincraft]

I would prefer a 1/2" shank. but at least now I know the things exist and have a basis from which to search from..

[adze_cnc]

I'm not understanding the spacer idea, especially since I need a slightly 'smaller' bearing...

Why a smaller bearing? Presuming you would be using a 3/4" rabbeting bit this would make the bit effectively larger as it can cut deeper before being stopped by the bearing.

In the absence of a larger bearing, to make the cut shallower, using a 1/32" spacer (or shim if you like) would make the cut shallower by moving the bearing away from the edge of the material.

For that matter you could saw your edge 1/32" larger and then cut with the 3/4" rabbeting bit and then trim off the 1/32" to size making a 23/32" rabbet.

Steven


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