Long wood drill bit

[chilluk]

I have to drill right through some softwood which is 220mm across as I want to sink in some LED lights.

I have tried drilling from both sides but it doesn't give a clean enough hole to pass the plug/cable through.

The only bits I can see in the sheds long enough are all masonary bits - would these be any good at all for going through softwood - the hole at the front will already be started with a 25mm "spade" type bit as that is what the light fittings need for their housing.

Alternatively any suggestions as to specific long bits?

Cheers.

 

[big-all]

at "screwfix "
you can either buy 1 long bit or an extension
altough its so so easy to come out the side on that length

how thick is your timber!!!!

http://www.screwfix.com/search.do?_...drill+bits&pn=1&pd=1&pi=1&cn=1&cd=1&x=13&y=12

 

[Jasonb]

Assuming your hole is just for the wiring then either get a 12" long spade bit, these go down to 8mm dia. Or get a 12" bradpoint drill, I have a set from 1/8 to 1/2" and have used then to run cables through shelves.

Axminster do individual bits 240mm long.

Rutlands do the set.

Jason

 

[Scrit]

Spade biy with spade bit extensions (see bottom of page) are probably the cheapest way to drill the hole for a one off job. My 300mm extension cost the princely sum of £2.99 off the local market

Scrit

 

[Jasonb]

But an extension is usually 12-15mm dia so can be a bit risky on a 18-25mm shelf

Jason

 

[gcol]

You want a long series drill bit.
http://www.tool-up.co.uk/shop/diy/scan/se=6526/sf=cat
Bare in mind that the drill is bound to wander off line though.

 

[Jasonb]

those arn't cheap are they but Dormer are a lot better than the imports

Jason

 

[Trazor]

If you use a long series jobber drill, remove the drill from the hole every inch or so, to remove the wood chips, otherwise the drill will jam, heat up, and possibly even break.

You can make your own long series drill by brazing a length of the correct dia. steel rod to it.......much cheaper solution.

 

[chilluk]

Cheers all for the replies.

Timber is 120mm x 220mm so no worries for coming out of the side.

Wasn't sure of terms so knowing a few more descriptive names helped in searching!!

Have drilled all the 25mm holes this evening in a couple of inches for the lights housing, ready for when long one arrives to go the rest of the way!!

Thank god it's softwood.

Will post some pics of garden thus far soon in garden forum although found a bit of an issue today

 

[gcol]

If you use a long series jobber drill, remove the drill from the hole every inch or so, to remove the wood chips, otherwise the drill will jam, heat up, and possibly even break.

Otherwise known as "peck drilling".

 

[Jasonb]

Otherwise known as "peck drilling".

Not to be confused with drilling your Peck..r

Jason

 

[Scrit]

Jason

That has a bit of an "Albertian" ring about it. Do tell more.......

Scrit