I have a question on tapping aluminum, I have been tapping using the coolant for lubrication, I dont think this is sufficient after breaking a tap. Is it common practice to shut off the coolant and use tap magic or something similar for each hole?
The holes are tapped 5 mm x .8, drill size is correct for 75 percent thread they are .375, .5, .625 deep thru holes. rpm is 300, 10 ipm feedrate.
Thanks for any help with this.