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|
|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 ).
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 .
- 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.
- Hoischen: Technical Drawing - Basics, Standards, Examples; 14th edition, 1974; P. 81.