Drill/bore large deep hole.

[Spedley]

I have a post in the garden, 500mm high and 60mm diameter. I'd like to drill a matching hole in the bottom of a christmas tree so I can put it on the post.

What is the best way to drill the hole? I figured a centre hole that a larger bit could follow would be best but there is little choice of anything close to that diameter.

 

[big-all]

just a thought but no expert
25mm hole and metal rod/dowel

 

[securespark]

Two oversize jubilee clips?

 

[rsgaz]

60 or 64mm bi-metal holesaw, plus 1/4 inch hex shank arbor, with adapter for larger holesaws, plus two 1/4 hex 300mm extensions.

You just have to break out the slug that is left in the middle of the hole every time you reach maximum depth of the holesaw(very long 8 or 10mm screwdriver needed).

 

[Tigercubrider]

How big is this thing?
60mm wide in a tree will require the hell of a trunk
Therefore high, so you really need to think about safety

 

[foxhole]

Easier just to strap base of tree to post.Or cut out slot to rear of tree and strap pole in.

 

[Spedley]

60 or 64mm bi-metal holesaw, plus 1/4 inch hex shank arbor, with adapter for larger holesaws, plus two 1/4 hex 300mm extensions.

You just have to break out the slug that is left in the middle of the hole every time you reach maximum depth of the holesaw(very long 8 or 10mm screwdriver needed).

A bi-metal hole saw can't cut deep enough.

 

[rsgaz]

A bi-metal hole saw can't cut deep enough.

break out the slug that is left in the middle of the hole every time you reach maximum depth of the holesaw

 

[Spedley]

Yeah thought about that but not sure it will be possible after a few inches deep. It does seem like the best option so far as the centre bit should follow a whole and keep it straight.

 

[lostinthelight]

.

 

[foxhole]

https://www.screwfix.com/p/adjustab...VwpTVCh1jzANZEAQYASABEgJtt_D_BwE&gclsrc=aw.ds

And extension adaptor

 

[nickjb]

A forstner bit will do it. You'll need an extension to go deep though.

 

[Spedley]

A forstner bit will do it. You'll need an extension to go deep though.

That's my problem, trying to find one avout the right size in the uk.

 

[lostinthelight]

Xmas trees when freshly cut contain a high proportion of sticky sap, that. coupled with cutting deep in the end grain may cause a bits to overheat and jam . This could result in a less than straight parallel hole so the bit size would need to be well over the size of hole you need to compensate....you will only get one chance to get it straight, if not the tree wont fit over the post or will look like its pi$$ed

 

[lostinthelight]

60 or 64mm bi-metal holesaw, plus 1/4 inch hex shank arbor, with adapter for larger holesaws, plus two 1/4 hex 300mm extensions.

You just have to break out the slug that is left in the middle of the hole every time you reach maximum depth of the holesaw(very long 8 or 10mm screwdriver needed).

Could work if cutting accros the grain but OP needs to cut along the grain so slugs wouldnt break off