Boring Head

Purpose
Boring heads are used to create large diameter holes when tolerances do not allow for a drill bit or do not have a large enough drill bit or reamer. A boring head can also be used to enlarge holes, or adjust hole centerlines in certain instances.



Location
The boring head tool set is located in close vicinity to the manual mills in cabinet number six on the left hand side in the second shelf down. If the tools have been moved or rearranged and you cannot locate them then ask a mentor for help and clarification.



Tips
Adjustments for cutting depth are on a diameter basis. For a smooth finish remove 0.002 inches on the final pass. Use cutting oil to cool and lubricate tool.

Safety
Be sure all set screws are tight before operation. Be sure boring bar has a clearance to fit into hole when boring. Remove Allen wrench before turning the mill on. Double check mill speed before operation.

Operation
1.	Install head into mill.

2.	Install boring bar and tighten set screw.

3.	Loosen lock screw and adjust boring bar to hole edge.

4.	Dial for a cut (0.005 to 0.030 inches), tighten lock using small end to prevent over torque.

5.	Adjust mill speed for hole size and material (when mill is running).

6.	Engage worm feed on mill (mill should be on by now).

7.	Bring quill to material (reduces amount of time to wait for feed).

8.	Pull handle out to engage power feed.

9.	When at desired depth push handle back to disengage feed, and then turn off mill.

10.	Remove head from hole (backing off tool from side).

11.	Repeat above until hole is desired size.

12.	Remove bar from head. Clean and replace in box.

13.	Remove head from mill. Clean and replace in box.

14.	Make sure Allen wrench is in the box and put it in the cabinet.

15.	Disengage worm gear when done.

16.Disengage worm gear when done.