trochoidalpath
Cast Iron
- Joined
- Jan 17, 2016
Before I do something super dumb: I need to tap M12x1.75 through a 40mm thick 4140PH ground plate on a 16K Speedio. Haven't worked much with 4140, and the part has a fair bit of time into it, so I'd appreciate a quick sanity check.
My plan is to spot, drill to 11.2 mm with a carbide CTS drill, and then form tap. OSG ADO drill and XPF form tap in ER25 holders.
Am I going to regret it? Or am I going to run out of spindle torque and just stall out? Should I just plan on thread milling this instead? Thanks in advance!
My plan is to spot, drill to 11.2 mm with a carbide CTS drill, and then form tap. OSG ADO drill and XPF form tap in ER25 holders.
Am I going to regret it? Or am I going to run out of spindle torque and just stall out? Should I just plan on thread milling this instead? Thanks in advance!