Router + guide to put a lip on a piece?

[LancsRick]

I'll try my best to describe this without resorting to scribbles.

A typical lid has a downwards protrusion inside of the outer wall of the box, to hold it in place. Agreed? Good, hold that thought.

I will be making a lid from an oblong box (metal), by using the box as a guide to run a flush trim cutter against to cut my lid from some hardwood.

I then want to run a cut all away around that lid so I'm left with the downwards protrusion in the middle of the lid so that it sits properly in the metal box. What's my best way of doing this?

The thing that has entered my head is a flush trim bit with a whole selection of removal bearings, such that you fit the bearing that gives you the required overlap of the cutter - e.g. a 5mm bearing on a 10mm cutter would give an edge of 2.5mm. Is that the way to do this though?

Thanks.

 

[marcros]

a sketch would help?

 

[LancsRick]

Aha! My googling has finally paid off. I want a rebate cutter set with multiple bearings. They're pricey though! Hopefully that clears up what I'm trying to achieve though - are there any other approaches?

 

[marcros]

do you need a multi bearing set? can you not work out the size that you need?

I cant quite picture what you are trying to do- use the metal box to but a lid that will fit inside it? with careful set up, you can probably do it with a straight bit.

 

[sunnybob]

Theres a way that doesnt need a router at all.

make the lid in two pieces. make the inner (lower section) as a sliding fit into the box. make the upper section with whatever overlap size you want. Glue the two together and paint / varnish.

 

[LancsRick]

do you need a multi bearing set? can you not work out the size that you need?

I cant quite picture what you are trying to do- use the metal box to but a lid that will fit inside it? with careful set up, you can probably do it with a straight bit.

I could for this job yes, I was hoping (forlornly) that buying a set might be cheaper in the long run but it doesn't look like it's the case!

 

[LancsRick]

Theres a way that doesnt need a router at all.

make the lid in two pieces. make the inner (lower section) as a sliding fit into the box. make the upper section with whatever overlap size you want. Glue the two together and paint / varnish.

Well now I feel a bit foolish...

Thanks though!

 

[sunnybob]

I'm good at getting round spending money on speciai tools (lol)

 

[Rob Platt]

assuming the lid is flat do it from the underside and use your fence by adding a piece of timber if necessary
all the best
rob