Drilling large holes in logs

[voj maintenance]

Forstner bits but a good quality one that size will cost you a bit

 

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[lux]

I use DeWalt Forstner bits. Often use a 92mm bit on reclaimed oak beams that are like concrete. Cuts through lovely and you can put a decent edge back on them with a flat file. Can't fault them. Think they only cost £36 new and delivered.

They can get hot cutting the old dry timbers so quench them during use to keep the cutting edges tempered.

Like others have mentioned, don't be tempted by cheap bits. The difference is night and day, just don't waste time and money on them.

[porangi]

This is really interesting. Thanks Guys. Keen to hear about ideas for getting flat bottoms? I did think about using a bearing router to clean up the bottom?

 

 

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[lux]

Forstner bits will leave a flat bottom in the hole anyway.

[forestgough]

Hello lux

what drill are you using to tun a big bit like that

[lux]

I use two drills

 

Mainly a 4 speed sapphire in a heavy press. Lowest gear and it generates huge torque. Happily glides through 300 year old beams. Drills RSJ's etc

 

And also a 3 phase Gima gear driven pillar drill although that's huge over kill for most work but will drill anything. I don't use it often.

 

You need a drill that generates good torque and power on a low low speed setting. Too high in rpm is a pain and makes accuracy tricky.

Make sure everything is braced well.

 

Spend your money on a good bit and it will be hugely worth it. I like the dewalt bits as they are good value and quality. They sharpen well, quenching to keep the temper is important.

I'm usually drilling 18 to 20 cm deep with the 92mm bit.

 

Let me know if you need any help.