19mm Dog holes

[johnfarris]

Hello Folks
I am having a head scratching afternoon, and these occasionally lead into a Laurel & Hardy moment.
So to prevent that happening can someone please explain to me how I can carry out the following

I want to rout a series of 19mm dog holes using router with 30mm guide bush with a straight cutter.
I am trying to come up with a combination of a flat bit cutter to drill my initial jig hole & a router cutter with 30mm guide bush that will give me a 19mm hole.

cheers

 

[Glynne]

Does it have to be with your router?
I cut mine using a forstner bit with the simple jig that Richard McGuire aka the English Woodworker uses. Check out his web site.

 

[Baldhead]

Does it have to be with your router?
I cut mine using a forstner bit with the simple jig that Richard McGuire aka the English Woodworker uses. Check out his web site.

+1 easy and quick

Baldhead

 

[Phil Pascoe]

An ordinary auger. If you've a drill press bore a couple of 19mm holes through a piece of scrap and clamp it down to guarantee holes being vertical.

 

[johnfarris]

Thanks for the replies chaps. Sorry I forgot to mention I want to rout 230 dog holes,
like how this chap has done here http://www.woodworkuk.co.uk/forum/viewt ... f=9&t=9644.

 

[Phil Pascoe]

As you wish, but I can't see any reason or need for anything like that many. :?

 

[Phil Pascoe]

Thinking about it I've got about 27, and I've never used half of them.

 

[GLFaria]

Thanks for the replies chaps. Sorry I forgot to mention I want to rout 230 dog holes,
like how this chap has done here http://www.woodworkuk.co.uk/forum/viewt ... f=9&t=9644.

:roll: On just one top? Talk of a sieve! Fine for small things to fall down the nearest hole. And it must have some effect on the stiffness of the top.

Of course, my comment doesn't aplly if we are talking of 230 dog-holes on 20 tops, or if this is for laying a mattress on...

 

[Glynne]

Hope your marking out is good so as to miss all of the cross struts in the torsion box!

 

[Green]

Buy a machine gun.

 

[deema]

I believe the sum your after is

Jig Hole size = 30 + (19 - diameter of router bit selected)
note router bit must be less than 19mm

 

[t8hants]

Last time I saw a doging down slab with that many holes, it was 5" thick cast iron, and we used it to bend and flatten steel boat frames. Mind you that was 10' x 20' in area.

 

[johnfarris]

I believe the sum your after is

Jig Hole size = 30 + (19 - diameter of router bit selected)
note router bit must be less than 19mm

Why less than 19mm?

 

[deema]

Sorry, should be less than or equal to 19mm. My note was not very well written.

 

[Stu_2]

Can I ask why you want 19mm? Is it because you have traditional dogs?

Cheers
Stu

 

[Peter Sefton]

As I understand it most bench top kit is made to suit 19mm dog holes. All the Veritas and most of the Sjobergs cramps and planing stops we stock match 19mm.
I believe Festool is based on 20mm and possibly others.

Cheers Peter

 

[johnfarris]

Can I ask why you want 19mm? Is it because you have traditional dogs?

Cheers
Stu

Yes it is

 

[glynster]

I used a 19mm toothed forstener bit for the same job - takes longer to drill but no setup and perfectly clean holes. But then I needed round holes because I use sections of a 19mm hardwood dowel as dogs - they work a treat after tapering one end slightly by sanding.

 

[Stu_2]

Can I ask why you want 19mm? Is it because you have traditional dogs?

Cheers
Stu

Yes it is

For the sacrificial table tops I've produced, I've used a 19.05 bottom cutter from Axminster. I believe the traditional stuff is actually 3/4", hence the 19.05 cutter. That said, I've only ever done one with these size holes, as everything else has been 20mm, with the 19.05 cutter being my 2nd stage of material removal.

For perfectly consistent size holes I'd recommend using a slightly smaller cutter for maximum waste removal first. This method is only really viable if your using a template and guide bush.

If the holes are only to be used for dogs and clamps, and don't need to perfectly square across the whole table, you could always just mark out your required grid and use a straight edge to guide the router along the table, plunging where necessary. You'll need to clamp a piece of wood either side of the router base when plunging, to stop any sideways movement.

Even easier if you're lucky enough to have a router that attaches to a guide rail.

Cheers
Stu