Choosing the right machine can seriously increase your shop’s productivity and quality. If you’re deciding between a Vertical Machining Center (VMC) and a Drill Tap Center, it helps to understand what each one does best. Both machines drill and tap holes, but they’re built for very different jobs.
A VMC Machine is like the all-rounder of machining. It can mill, drill, tap, and contour complex parts with ease. It handles tough materials, sometimes up to 60 HRC or more, when you use the right tools. VMCs spin at moderate speeds, usually between 3,000 and 12,000 RPM, and their tool changers can hold 20 or more tools. That means they’re super flexible and ready to tackle a variety of tasks in your shop.
Drill Tap Machines are specialists built for speed and precision when drilling and tapping holes. They crank up spindle speeds to 15,000–20,000 RPM and change tools in just a couple of seconds. These machines shine in high-volume production where you need lots of holes and threads, especially in materials up to about 45 HRC. They’re less flexible than VMCs but incredibly efficient for their purpose.
Material |
Typical HRC |
VMC Suitability |
Drill Tap Suitability |
Mild Steel |
~15–25 HRC |
✅ Excellent |
✅ Excellent |
Aluminum Alloys |
~10–20 HRC |
✅ Excellent |
✅ Excellent |
Cast Iron |
~20–30 HRC |
✅ Excellent |
✅ Good |
Stainless Steel |
~20–35 HRC |
✅ Excellent |
Possible with proper tool &
coolant |
Tool Steel |
~25–35 HRC |
✅ Excellent |
Limited use |
Brass/Copper |
~10–20 HRC |
✅ Excellent |
✅ Excellent |
Feature |
VMC Machine |
Drill Tap Center |
Spindle Speed |
Up to 15000 RPM |
Up to 24,000 RPM |
Tool Change Time |
3 - 8 seconds |
1 - 3 seconds |
Material Hardness |
Up to 60+ HRC |
Up to 45 HRC |
Material Machinability |
Heavy-duty |
Medium to light-duty |
If you need to machine complex parts that are heavily hard material milling and multiple operations, go with a VMC Machine. But if your work focuses on fast, repetitive drilling and tapping, especially on moderately hard materials, a Drill Tap Machines will save you time and increase your output.
Ready to improve your machining process? Reach out to STM today, and we’ll help you find the perfect machine for your needs!