Curtis Hight
Member
- Joined
- Aug 19, 2011
- Messages
- 19
I need to plunge a lag screw 12 inches. I am looking at the MB 40. Is there an elegant approach to increasing the plunge depth?
MB-40 extension to 12 inches of plunge
- Thread starter Curtis Hight
- Start date
Cheese
Member
Just use the MB 40 to plunge the lag screw 6”, after that remove the drill and drive it in the rest of the way. Once that lag screw has been driven 6” into wood, it’ll take an act of God or a locomotive to substantially change it’s direction.
Curtis Hight
Member
- Joined
- Aug 19, 2011
- Messages
- 19
I'm not sure that I am understanding you: If the lag screw is 12˝, then how do I have the clearance for the first 6˝ without building a special base to raise the drill stand. (I also have to drill a pilot hole a good 11.5˝. Now, I could drill the first 6˝ with a shorter bit and then drill the full length with a longer one, and then run the lag screw manually the first 6˝ before finishing with the MB 40, but I am hopeful for a more straightforward solution).
onocoffee
Member
My guess is that you might use a shorter length of screw to start, pull it out and then drill in the 12” fastener?
luvmytoolz
Member
There's always the "GD 460mm Portable Swivelling Drill Stand" if it's available around your area?
Might be a tad overkill for one lag screw though.
Might be a tad overkill for one lag screw though.
Cheese
Member
It’s called a cement block. 
bertv
Member
Once you have the pilot hole done, which is just a matter of using the MB 40 for its max depth and then continuing 'freehand' to the desired depth, the lag will follow the pilot hole. No need to use the MB 40 for that. (There is something called 'the path of least resistance' and that applies here).
Once your hole is a few inches deep, stop using the guide and drill away. You have already created a guide for your drill bit.
Peter
Peter
