Hi

I want to drill 5 x 16mm holes in heavy gauge 50mm box tubing (4-5mm wall thickness maybe) Each hole has to pass through both walls.

Each hole has to be exact in location to the other 4, but precision in it's diameter. So that a 16mm mild steel bar will fit in easily but with almost zero play. Like fitting into a sleeve. It's fit once and leave, not meant to serve as a bearing.

I may have to drill 20 sets. (100 holes) I don't think a drill bit would be best for this.

My plan is to use my little mill. What is the best mill bit I can use? Do I need to drill a special pilot hole. And what rpm.

Remember, I'm only a monkey with a little brain. An exact part number/s and monkey-see-monkey-do instructions would be ideal.


Thanx if you can help... Greg.








.
Attached Images




Read the full thread at metalworkforums.com...