Use the attached recommended Speed/Feed chart
to answer the following questions.Please Show all
work and submit your answers:
1. What is the formula for calculating spindle speed in
milling/drilling operations?
2. What rpm should you set the spindle on an end milling
operation in Aluminum 2024 T6? The tool path is a pocketing
operation using a 3/4” end mill with .125” depth cuts. The aluminum
is 5”x 6” x 2” and is being held in a 6” mill vise.
3. What would be an appropriate spindle speed for a 4
inch face mill (8 carbide cutting inserts) when machining stainless
steels?
4. What is the recommended surface feet per minute for a
drilling operation in a brass alloy using a High Speed drill
bit?
5. What rpm should you set a drill press to if you are
drilling a 7/16″ hole in a piece of mild steel. The steel is 1/4″
thick and the hole will go all the way through. (Assume a 118 deg
High Speed Steel Drill bit).
Tony SparkEnlightened
Let the spindle speed be S TDS 1000 Vx1000 rD Here, Vis cutting speed and Dis diameter, This both parameters vary from types of pipe and material selected. Wx1000 TTD Hence, the required formula is S Expression for the number of revolutions, 12xV rD Substitute the values, 12x 250 ㄫ ㄨ ㄧㄧㄧㄧ 4×12 144000 = 15278.87 15279 rpm the spindle should be 15279 The expression for spindle speed is, Vx1000 兀D Substitute the values, 60 × 1000 S= 12 28647.889×2 60 954.92 ft/sec Hence, the required spindle speed is954.92ft/sec Expression for the number of revolutions, We were unable to transcribe this image