Bradshaw Joinery
Established Member
Difficult one....
http://www.toolstop.co.uk/starrett-fcw0 ... 2mm-p22721
Could try with this from the face with a pilot hole right through before hand. (use a long say 6mm auger as guide)
Then remove centre plug by any means ( could do a few them mortice a line through the middle of the holes and then break the half moon off with a bar/cold chisel/hammer.
Then on the back edge use a bigger cutter say 100mm to do the same.
This will give the clearance for the 92mm bit as the spanner flats are proud of the cutting edge(they might mot be they just look like it)
This would leave you with 2" in the middle to use the 92mm cutter on.
In actual fact, youd only need to remove the plug left from the back as the front would be removed when the cut goes through.
If it was me id just grind the spanner flats off and use the 92mm all the way.
http://www.toolstop.co.uk/starrett-fcw0 ... 2mm-p22721
Could try with this from the face with a pilot hole right through before hand. (use a long say 6mm auger as guide)
Then remove centre plug by any means ( could do a few them mortice a line through the middle of the holes and then break the half moon off with a bar/cold chisel/hammer.
Then on the back edge use a bigger cutter say 100mm to do the same.
This will give the clearance for the 92mm bit as the spanner flats are proud of the cutting edge(they might mot be they just look like it)
This would leave you with 2" in the middle to use the 92mm cutter on.
In actual fact, youd only need to remove the plug left from the back as the front would be removed when the cut goes through.
If it was me id just grind the spanner flats off and use the 92mm all the way.
