Large diameter recess (blind hole) in plywood.

[MCEnforcer]

I need to cut/drill/bore a large diameter recess in plywood. The recess needs to be about 10mm deep.

Basically I am making a drawer to hold numerous round containers and I don't want them to move around. A CNC would be perfect - if I had one - so I need the best way to cut a 60mm diameter hole at 10mm deep. I was thinking a forstner bit but I am not sure of the "flatness" of the bottom of the hole.

Oh, and I have got to repeat the exercise a few hundred times.

Any thoughts would be appreciated.

 

[CHJ]

Use a router and circle cutting guide.

 

[Racers]

How about two layers of ply one with holes with another underneath?

Pete

 

[sunnybob]

What Pete said.
Use 12 mm ply, cut the sheets with a hole saw with the pilot drill removed. Glue a 4 mm sheet of ply to it, job done.

 

[Phil Pascoe]

Use a router and a cutter with a bearing guide or else a bush (more control over the depth with a bush) and make up a jig with the circles cut out and the ability to hold the ply where you want it. If you've got hundreds it's worth spending a couple of hours (if needed) making up a jig, it'll make the work so much quicker. (and of course you can easily repeat it indefinitely if needed.)

 

[John Brown]

I'd go with the two sheets of ply solution. But I'd also go for a hole saw over a router, if you've got a few hundred to do. Not sure how removing the pilot drill would help, unless you're able to use a pillar drill.

 

[Racers]

A grid of thin strips will also hold the containers in place or dowels/blocks of the right size.

Pete

 

[sunnybob]

I'd go with the two sheets of ply solution. But I'd also go for a hole saw over a router, if you've got a few hundred to do. Not sure how removing the pilot drill would help, unless you're able to use a pillar drill.

I thought he wanted the discs, but on re reading it he wants the holes, so leave the pilot drill alone :roll: :roll:

 

[Phil Pascoe]

You thought he wanted the discs from blind holes ....... :?

 

[sunnybob]

What? you mean you cant recover blind discs? :roll:

 

[Phil Pascoe]

Of course you can ......... but I doubt he'd want to do hundreds of them.