What speeds and feeds are recommended for trepanning?

Trepanning speeds and feeds depend on the material being machined and the specific trepanning tool used. Generally, a spindle speed of 50 to 150 surface feet per minute (SFM) is recommended for most metals, while feed rates can range from 0.005 to 0.025 inches per revolution (IPR). It's essential to consult the tool manufacturer's guidelines and adjust based on machine capabilities and material properties for optimal results.