Accurate *small* holes with a router?

[transatlantic]

Has anyone come up with, or seen a circle jig for a router, designed to cut small holes? 100mm and less?

It would be easy enough using the pin approach, but I really want it to have micro adjust capability.

 

[Nelsun]

Trend do one with 100, 75, 50 and 25mm

https://www.ffx.co.uk/tools/product/Tre ... orner-Hole

£47!

 

[adidat]

Or do what I did, 'borrowed' my bosses one and stick it to a piece of corian or ply and make a copy with a bearing router bit!

It's fairly useful at times!

(hammer)

Adidat

 

[Woody2Shoes]

I assume you mean by the "pin" type something like the Trend CRB/7 - which also has a "fine" adjustment.

e.g. https://www.youtube.com/watch?v=JHPNOrMgr3E

There was a thread about it on here some years ago - I think the concensus was/is that it's much cheaper to make your own - someone made one for himself out of an old HDPE kitchen cutting board.

I've made several (but without a 'fine' adjuster) out of 5mm ply and they work fine down to about 50mm (my biggest forstner bit size).

I'm not aware of any other type of jig that would do the job.

Cheers, W2S

 

[siggy_7]

I made a circle cutting base plate from Bill Hylton's "router magic". The base plate has a t slot routed into it, a corresponding t bar with a nail through it adjusts the radius by sliding in the groove and then gets locked in position. I've never explored it's minimum hole capability but I reckon it's good down to about 30mm with a small diameter bit.

Sent from my SM-N910F using Tapatalk

 

[ColeyS1]

This was my effort.

I screw a countersunk magnet to the workpiece (a magnet only because it was nice and round and had a countersunk hole) then locate it over the hole near my thumb. The jig just screws onto the bottom of the router.

Sent from my SM-G900F using Tapatalk

 

[transatlantic]

Cheers guys - some ideas to explore!

And yes, I did mean an adjustable jig, so I can dial in the exact value.

 

[sunnybob]

if youre REALLY serious.....
http://www.lescopeaux.asso.fr/Technique ... nglais.pdf

 

[Student]

I made my jig following Ron Fox's design

https://www.wealdentool.com/kb/rons-tip ... es-router/

The Wealden Cutters site is very useful for tips on using routers.

 

[transatlantic]

I made my jig following Ron Fox's design

https://www.wealdentool.com/kb/rons-tip ... es-router/

The Wealden Cutters site is very useful for tips on using routers.

Ah - so moving the router itself as the adjustment. That's a simple approach. Think I'll try that first.

 

[Woody2Shoes]

if youre REALLY serious.....
http://www.lescopeaux.asso.fr/Technique ... nglais.pdf

Oooh, that's a clever idea - an "English tripod"!

Only trouble is, it would seem that you need to cut a couple of quite accurate circular objects to make it...

I'm seriously tempted to make one. Cheers, W2S

 

[Woody2Shoes]

I made my jig following Ron Fox's design

https://www.wealdentool.com/kb/rons-tip ... es-router/

The Wealden Cutters site is very useful for tips on using routers.

Ah - so moving the router itself as the adjustment. That's a simple approach. Think I'll try that first.

That's the basis of the Trend CRB/7 and the homemade equivalents else (except Coley's) - here's the one that Mike Wingate (of this Parish) made five years or so ago: trend-combination-router-base-t70266.html#p781828

Cheers, W2S

PS here's one that looks very like the one I've most recently made - except that I use an M6 washer at the centre (and stick a shopmade 6mm peg into the workpiece): http://www.clapham-locksmiths.co.uk/pro ... 010-router

 

[transatlantic]

I made my jig following Ron Fox's design

https://www.wealdentool.com/kb/rons-tip ... es-router/

The Wealden Cutters site is very useful for tips on using routers.

Ah - so moving the router itself as the adjustment. That's a simple approach. Think I'll try that first.

That's the basis of the Trend CRB/7 and the homemade equivalents else (except Coley's) - here's the one that Mike Wingate (of this Parish) made five years or so ago: trend-combination-router-base-t70266.html#p781828

Cheers, W2S

That's perfect for my dewalt

 

[Jon.1976]

I recall seeing a YouTube video by Richard Morley where he makes small and large circle jigs. His channel is called brain fizz. Can’t remember the exact video but I think it’s in the router 101 section. Really good channel.

 

[Jon.1976]

As soggy mentioned, router magic is pretty good.