This explanation covers the common range of Morse tapers used for drills, helping to understand the standardization involved in machining tools.

Morse Taper Basics

A Morse taper is a type of standard, self-holding taper used for locating and driving cutting tools or machine tool accessories. The "self-holding" property means the taper's friction fit is strong enough to keep the tool in place during operation without needing external locking mechanisms, although a drawbar or key may be used for extra security or removal.

These tapers are standardized, meaning there are specific sizes designated by numbers, such as MT0, MT1, MT2, MT3, MT4, MT5, MT6, and even larger ones like MT7, MT8, MT10, MT12, and MT15.

Understanding Morse Taper Sizes

Each Morse taper size corresponds to a specific diameter and length, ensuring compatibility between tools and machine spindles. The sizes increase numerically, with larger numbers indicating larger tapers.

Here's a general idea of where different sizes are typically used:

• MT0, MT1, MT2: Generally used for smaller machine tools like bench drills, small milling machines, and lathes. Often used for smaller drill bits or tools.
• MT3, MT4, MT5: Common for medium to larger capacity drill presses, milling machines, and lathes. These sizes accommodate larger tools and heavier cutting forces.
• MT6 and above: Typically found on very large industrial machine tools.

The suitability of a specific Morse taper size depends on the size of the tool (like a drill bit shank) and the capacity of the machine tool.

Morse Taper Range for Drills

When discussing the range of drills specifically fitted using Morse tapers, the most commonly encountered sizes fall within a particular spectrum. While very small drills might use MT0 or MT1, and very large industrial drills could potentially use shanks designed for MT6 or larger, the practical and widely used range for standard workshop drills is generally considered to be from MT1 up to MT5.

This range covers:

• MT1: For smaller drills.
• MT2: A very common size for medium drills.
• MT3: Suitable for larger drills.
• MT4: Used for significantly sized drills.
• MT5: Accommodates large diameter drills.

Sizes like MT0 are less common for drills compared to MT1-MT5, and sizes MT6 and above are typically reserved for very heavy-duty machine spindles or specialized tooling, rather than standard drill shanks.

Evaluating the Options

Let's look at the options provided in the context of common drill applications:

• mt10 to mt15: These are large Morse taper sizes, generally not associated with standard drills.
• mt0 to mt2: While MT1 and MT2 are used for smaller drills, MT0 is less common for drills, and this range excludes the commonly used larger sizes like MT3, MT4, and MT5 for drills.
• mt6 to mt10: Similar to the first option, these are large sizes not typically used for standard drill shanks.
• mt1 to mt5: This range includes the most frequently used Morse taper sizes for fitting a wide variety of drill bits onto machine tools.

Conclusion on Morse Taper Drill Range

Based on the common applications in machining, the range of Morse tapers most typically provided for fitting standard drills spans from MT1 through to MT5. This selection covers small, medium, and large drills encountered in most workshops.