Morse taper
The Morse taper ( MK ) or Morse taper is the standardized form of a tool cone for clamping tools , e.g. B. large drills , reamers and chucks in the tool holder of a machine tool . The international name Morse taper (mt) is synonymous .
The torque transmission from the hollow cone (sleeve) of the driven tool spindle to the tool shaft clamped in it takes place frictionally through static friction as a result of the self-locking . The sleeve has a transverse opening (in the picture above on the right) through which a wedge can be driven to push the cone out. Morse taper in 7 sizes - referred to as MK 0 to MK 6 - with the maximum shank diameters of about 9 to 63 mm with only slightly different taper ratios between 1: 19.002 and 1: 20.047 are after 228 DIN parts 1 and 2 standardized. The angle of inclination of the Morse taper is about 1 ° 26 'to about 1 ° 30'. The most important dimensions of the shaft and sleeve of the Morse taper 0 to 6 (all in mm):
| Component | Measure | MK 0 | MK 1 | MK 2 | MK 3 | MK 4 | MK 5 | MK 6 |
|---|---|---|---|---|---|---|---|---|
| shaft | D 1 | 9.212 | 12,240 | 17.981 | 24.052 | 31,544 | 44.732 | 63.726 |
| shaft | d | 6.401 | 9.371 | 14,534 | 19.76 | 25,909 | 37.47 | 53.752 |
| shaft | d 2 | 6.115 | 8,972 | 14.06 | 19.133 | 25,156 | 36,549 | 52,422 |
| Sleeve | D. | 9.045 | 12.065 | 17.781 | 23.826 | 31.269 | 44,401 | 63,350 |
| Sleeve | d 5 | 6.7 | 9.7 | 14.9 | 20.2 | 26.5 | 38.2 | 54.8 |
| Cone ratio | 1: 19.212 | 1: 20.047 | 1: 20.020 | 1: 19.922 | 1: 19.254 | 1: 19.002 | 1: 19.180 | |
The tool holders of drilling and turning machines often have sizes MK 2 to MK 6.
In addition to this Morse taper series, DIN 228 standardizes 2 smaller (4 and 6 mm) and 5 larger ME metric taper (80 to 200 mm), all tapered 1:20. Morse also mentions the intermediate size MK 4 1/2, as well as MK 7 and 8. There are also reducing sleeves to adapt smaller Morse taper to larger holders.
Morse taper comes in the following 4 forms:
- Form A (shaft) and C (sleeve) with tightening thread for fastening.
- Form B (shaft) and D (sleeve) with drive tabs on the shaft and elongated hole in the sleeve for the drive wedge.
The name Morse taper is derived from Stephen Morse , who lived in the 19th century and founded a tool company in the USA in 1864 that still exists today (not to be confused with Samuel FB Morse , who gave the Morse code its name ).
In addition to the Morse taper, there are metric taper (ME) as well as steep taper ( SK) and hollow shank taper (HSK).
There are also the drill chuck taper in sizes B10 d1 = 10.09 d2 = 9.40; B12 d1 = 12.06 d2 = 11.10; B16 d1 = 15.73 d2 = 14.50; B18 d1 = 17.78 d2 = 16.20; B22 d1 = 21.79 d2 = 19.80; B24 d1 = 23.82 d2 = 21.30. The drill chuck taper is a part of a Morse taper. With a DIN 238 taper mandrel there is a Morse taper on the drive side (in the picture: right) and a (shorter) drill chuck taper on the output side .
Web links
- History of the company Morse (English)
- Taper tables (Morse, metric, Brown & Sharpe, Reinecker). Lueger, Otto: Lexicon of the entire technology and its auxiliary sciences, 1907.
Individual evidence
- ↑ Hoischen: Technical Drawing - Basics, Standards, Examples; 14th edition, 1974; P. 81.