Thread: Great big dirty cove bit?

The closest thing i have seen to a cove bit that size is a bracket foot moulding bit:


Molding Bits - Bracket Foot Molding Bits


joez

Thanks Joez , it's big but not the right profile. I'm currently working on what bits I'd need to make the moulding in the first shot.

But it's not a big cove.

Originally Posted by Waldo

G'day,

I'm up to the point of doing my crown moulding for the bookcase I'm building https://www.woodworkforums.com/f40/wa...3/index16.html

Below are 3 shots.

The moulding I'd like to do, and a compromise using one bit which I would have to barstardise using other profiles, the one I can do with bits I have on hand right now but it's not really to the scale of size I'd like to do.

Timber that's been waiting for a year now calling out to me everytime I go down to the shed is a nice bit of t/blackwood 100mm x 50mm x 2.4m

what length of molding do you require? Is it only 2.4m?
do you have to precisely match the molding you've shown?
are you prepared to use a molding plane?

and now that I've looked closely at the profile, I think you would make it in 4 or 5 separate parts

From joez's link, why not use one of their 186-4705 Vertical Panel Raiser - Cove router bits?

Okay...

Ian, nope don't need to match anything exactly, just trying to find ideas and then sort of interpreting from there. Yep, only need about 2.4m length, but I'm not looking to go out and get it done externally as that takes away the fun/misery.

I'd use moulding planes, except the one I have would only do a rabbet. If I go with the first profile it would be most likely in a few bits.

Yeah, Woodwould, the vertical cove bit would get me some of the way, pity it's not a Whiteside bit as I can get my hands on them.

Appreciate the help and ideas.

Gday Waldo

I admit up front I'm not into advanced routing/moulding yet.

BUT, that said would a moulding knive like in the attached website be any good.
Moulder Knives to Suit Planer Moulder Machines : CARBA-TEC

I have a CT236 if you want to use. You keep the blades I learn something type deal.

Hope the attachment sticks

Hmm... something to about.

For limited production, or one-off, consider multuple passes with a variety of standard bits. Like here: https://www.woodworkforums.com/f40/flag-holder-75678/

Cheers,
Joe

After lots of leaning, pondering, thinking and looking at my navel fluff I'm going down the path of the profile of the first shot.

It'll be done from various profiles. I've not done a crown moulding before and I had in my head the moulding I wanted to do but found I couldn't find the size cove bit I want.

So down the path of uncharted waters I go, how I come out at the other side will be interesting. But before I stuff up good timber I'll do dummy runs using off-cuts I have lying around the place.

Waldo,

I have quite a few profiles of knives for my spindle moulder.

I would need to confirm with you that I have the correct size firstly of course.

You are welcome to bring along your timber and enthusiasm to my shed - perhaps an overnight stay with the family in the self contained cottage.

Total cost - beer and meat for the BBQ (after the spindle moulding)

I'm thinking...

Originally Posted by Waldo

After lots of leaning, pondering, thinking and looking at my navel fluff I'm going down the path of the profile of the first shot.

It'll be done from various profiles. I've not done a crown moulding before and I had in my head the moulding I wanted to do but found I couldn't find the size cove bit I want.

So down the path of uncharted waters I go, how I come out at the other side will be interesting. But before I stuff up good timber I'll do dummy runs using off-cuts I have lying around the place.

this is how I'd approach your shape
4 pieces glued and pinned together

G'day Ian,

That's not too far off how I figured I can tackle it. I reckon though I could get the top two pieces - the 1/4 round and r/ogee with a fillet in one. Or maybe not?

Originally Posted by Waldo

G'day Ian,

That's not too far off how I figured I can tackle it. I reckon though I could get the top two pieces - the 1/4 round and r/ogee with a fillet in one. Or maybe not?

I think it would depend on whether you are using a bit with a bearing or not.
What I didn't show is that the deeper section would normally be cut into a piece thinner than what I've shown, with angles steeper than 90° each end.