The Morse standard taper is available in _______ numbers.
8
Understanding Morse Standard Tapers
The question asks about the number of standard sizes available for the Morse taper. The Morse taper is a common system used to allow tools, such as drill bits, reamers, and milling cutters, to be held in the spindle of machine tools like drill presses, milling machines, and lathes.
It is a self-holding taper, meaning it relies on the friction between the mating tapered surfaces to hold the tool securely in the spindle. This design allows for easy insertion and removal of tools.
Standard Morse Taper Sizes
The Morse standard taper is available in a specific set of standard sizes. These sizes are designated by numbers.
The standard Morse taper series includes the following numbers:
- MT0
- MT1
- MT2
- MT3
- MT4
- MT5
- MT6
- MT7
Counting these designations, we find there are 8 standard numbers in the Morse taper series, ranging from MT0 to MT7.
Each standard Morse taper number corresponds to specific dimensions, including the taper angle, the diameter at the large end, and the diameter at the small end (for the socket), as well as the length.
| Morse Taper Number | Approximate Taper Per Foot |
|---|---|
| MT0 | 0.500 inch/foot |
| MT1 | 0.498 inch/foot |
| MT2 | 0.497 inch/foot |
| MT3 | 0.502 inch/foot |
| MT4 | 0.502 inch/foot |
| MT5 | 0.526 inch/foot |
| MT6 | 0.526 inch/foot |
| MT7 | 0.609 inch/foot |
Note that while there are 8 standard numbers (0 through 7), the taper angle is not identical for all sizes, though it is approximately 5/8 inch per foot (or about 1 in 20 taper ratio) for most common sizes (MT0-MT6). MT7 has a significantly different taper.
Therefore, the Morse standard taper is available in 8 numbers.
Revision Table: Morse Taper Facts
| Feature | Description |
|---|---|
| Purpose | Tool holding in machine spindles |
| Holding mechanism | Friction (self-holding) |
| Standard Numbers Available | 8 (MT0 to MT7) |
| Taper Angle | Approximately ≈ 5/8 inch per foot (varies slightly between sizes) |
Additional Information on Tapers
Beyond the Morse taper, other taper systems exist, such as the Brown & Sharpe taper, the Jacobs taper (often used for drill chucks), and various machine tool builder specific tapers like CAT, BT, and HSK which are steep tapers and rely on a drawbar for retention rather than self-holding friction.
The Morse taper is particularly prevalent in drilling machines and older milling machines due to its simplicity and effectiveness for torque transmission through friction. The tang at the end of tools with Morse tapers helps in driving and also facilitates tool removal using a drift.
Understanding the different taper sizes and types is crucial in machining to ensure proper tool fitment and safe operation.
Similar Questions
What is the point angle of the drill used to drill copper?
The clearance angle of a drill is between ______.
What is range of drills provided on a Morse taper?
Which of the following formulas is used to calculate rpm where cutting speed and diameter are known?
The helical angle of the drill determines the _______.
The distance that the tool advances for each revolution of the work is known as ______.
Centre drills are usually held in a ________.
Find the tap drill size, if the major diameter is 10 mm and the pitch is 1.5 mm.
The process of enlarging a hole size and enhancing its surface finish is known as _______.
If you want to drill a hole in a switchboard, then you will use a ____.
Important Questions from Drilling and Reaming
What is the point angle of the drill used to drill copper?
The clearance angle of a drill is between ______.
What is range of drills provided on a Morse taper?
Which of the following formulas is used to calculate rpm where cutting speed and diameter are known?
The helical angle of the drill determines the _______.
