Drilling a hole deeper than the holesaw depth

[richard7761]

A holesaw cuts to certain maximum depth.

I have a situation where I cannot cut from both sides, and the holesaw depth of cut is not as deep as the wood I want to drill a hole in.

I'm cutting right through timber (timber you make beams out of - whatever that is) that is 45 mm thick. I had in mind to purchase a set of Titan holesaws. Not a bad deal. Unfortunately I don't know the depth of cut, possible a "standard depth" - if there is such a thing. Unless someone has a Titan holesaw and can tell me, the 38 mm holesaw I guess will cut about 25 mm - 30 mm deep- but that's just a guess.

I think I'll be able to cut through the 45 mm thick timber if I keep chiselling out the centre part of the hole. Hoping the wood will easily chip away.

I could buy a Starrett holesaw which will cut to 41 mm deep. We have the DeWalt DT8138QZ, produces a deeper cut, but no idea how deep exactly (12.5 mm deeper cut than standard bi-metal holesaw).

Will probably stick with the Titan set.

Any tips or advice welcome Thanks. Rich

 

[Belboz]

Why not use an auger bit or even a forstner one like the one below

http://www.axminster.co.uk/axcaliber-forstner-bit-38mm

 

[Norcon]

Milwaukee self feeder is what you want.

 

[Dave54]

Or if it's softwood, even a spade bit
http://www.workshopheaven.com/tools/FAMAG-3510.038-38mm-Flatstar-Spade-Bit--Softwood.html
Lots available but that one has "scribers" (if that's what they're called) on it so should give a cleaner hole with a bit of care.

 

[richard7761]

Why not use an auger bit or even a forstner one like the one below

http://www.axminster.co.uk/axcaliber-forstner-bit-38mm

Yes. After publishing my post I looked down the page and saw a thread titled something like "Forstner V hole saw". And then I Googled to see what Forstner was all about. I now think I don't want a hole saw but a different kind of hole-making tool.

As long as the shank is long enough, seems like a Fostner tool is the better.

Thing is, whenever I think about larger holes in wood, I never think of anything but hole saw. That is being myopic in my thinking.

 

[big-all]

as an aside
assuming its a hole saw that fits to auger[drill bit]

drill to 75% off cutter depth
remove part off the core waste
then you can drill deeper until the chuck or drill body limit the depth

ooops sorry you are doing this

 

[richard7761]

as an aside
assuming its a hole saw that fits to auger[drill bit]

drill to 75% off cutter depth
remove part off the core waste
then you can drill deeper until the chuck or drill body limit the depth

Yes. That is what I had in mind. I think it would work.

I guess on balance I'm tempted to go with Forstner bits such as a 16 Piece Set (Product Code: 83345) rather than Titan Holesaws a 15 Piece Kit
(Product Code: 93131). But I ought to check the shank lengths to see if the Forstner bits would go on 45 mm.

Confined space means I need to use an electric drill.

 

[Norcon]

This short clip shows a whole range of self feeders...
https://www.youtube.com/watch?v=cXfqnEw4Krw

 

[richard7761]

Actually, latest thinking is to get a cheap flat wood drill bit set, and if I have the space, use my Stanley drill brace. Unless I can use flat wood drills with a variable speed electric drill then I'd use the electric drill.

 

[foxhole]

Expansive bit.
http://www.ebay.co.uk/itm/like/2815...1=ICEP3.0.0-L&ff12=67&ff13=80&ff14=108&ff19=0

 

[OwainDIYer]

Unless I can use flat wood drills with a variable speed electric drill then I'd use the electric drill.

I don't know if you're supposed to, but I do, on slowish speed.

 

[Deleted member 174758]

I guess on balance I'm tempted to go with Forstner bits such as a 16 Piece Set (Product Code: 83345) rather than Titan Holesaws a 15 Piece Kit
(Product Code: 93131). But I ought to check the shank lengths to see if the Forstner bits would go on 45 mm.

You get what you pay for - and they are both VERY cheap sets. The Forstners aren't self feeders and will require a lot of pushing (and probably grunting) to get them to drill a joist. You'll also have to back them out regularly as they are never very good at clearing waste - they are, after all designed to cut shallow, flat bottomed holes, NOT deep ones. They are simply the wrong tool for drilling joists

Actually, latest thinking is to get a cheap flat wood drill bit set, and if I have the space, use my Stanley drill brace. Unless I can use flat wood drills with a variable speed electric drill then I'd use the electric drill.

Spade bits will work with an electric drill, but not a brace (far too slow). For self feed Bosch do a useful type which has a threaded pilot point (most don't have this), but they are aggressive and not really suitable for use in hardwoods or for accurate/fine work. At least you can saw the shank down if space is an issue

 

[Belboz]

a 45mm joist????

 

[Deleted member 174758]

a 45mm joist????

2in thick, finished size.......

 

[Belboz]

a 45mm joist????

2in thick, finished size.......

I'll take your expert word for it J&K