And execution.

Morse taper and metric taper

The Morse taper is one of the most widely used tool mountings. Was proposed by Stephen A. Morse around 1864.

Morse taper is subdivided into eight sizes, from KM0 before KM7(English MT0-MT7, German MK0-MK7). Taper from 1: 19.002 to 1: 20.047 (taper angle from 2 ° 51'26 "to 3 ° 00'52", taper slope from 1 ° 25'43 "to 1 ° 30'26") depending on the size.

Metric cone

As the machine tool industry developed, it became necessary to expand the range of sizes of Morse tapers, both upward and downward. At the same time, for the new standard sizes of the cone, the taper was chosen exactly 1:20 (the angle of the cone is 2 ° 51'51 ", the slope of the cone is 1 ° 25'56") and they were named metric cones(eng. Metric Taper). The standard size of metric cones is indicated by largest diameter cone in millimeters. GOST 25557-2006 also defines reduced metric cones No. 4 and No. 6 (eng. ME4, ME6) and large metric cones No. 80, 100, 120, 160, 200 (eng. ME80 - ME200).

There are no design differences between the Morse taper and the metric taper.

Dimensions of the outer and inner cone (according to GOST 25557-2006), mm

Table 1

	Cone designation	Taper	D	D 1	d	d 1	d 2	d 3 max	d 4 max	d 5	l 1 max	l 2 max	l 3 max	l 4 max	l 5 min	l 6
Metric	№ 4	1:20	4	4,1	2,9	-	-	-	2,5	3	23	25	-	-	25	21
	№ 6	1:20	6	6,2	4,4	-	-	-	4	4,6	32	35	-	-	34	29
Morse	KM0	1:19,212	9,045	9,2	6,4	-	6,1	6	6	6,7	50	53	56,3	59,5	52	49
	KM1	1:20,047	12,065	12,2	9,4	M6	9	8,7	9	9,7	53,5	57	62	65,5	56	52
	KM2	1:20,020	17,780	18	14,6	M10	14	13,5	14	14,9	64	69	75	80	67	62
	KM3	1:19,922	23,825	24,1	19,8	M12	19,1	18,5	19	20,2	80,1	86	94	99	84	78
	KM4	1:19,254	31,267	31,6	25,9	M16	25,2	25,2	24	26,5	102,5	109	117,5	124	107	98
	KM5	1:19,002	44,399	44,7	37,6	M20	36,5	35,7	35,7	38,2	129,5	136	149,5	156	135	125
	KM6	1:19,180	63,348	63,8	53,9	M24	52,4	51	51	54,6	182	190	210	218	188	177
	KM7	1:19,231	83,058					-					285.75	294.1
Metric	№ 80	1:20	80	80,4	70,2	M30	69	67	67	71,5	196	204	220	228	202	186
	№ 100	1:20	100	100,5	88,4	M36	87	85	85	90	232	242	260	270	240	220
	№ 120	1:20	120	120,6	106,6	M36	105	102	102	108,5	268	280	300	312	276	254
	№ 160	1:20	160	160,8	143	M48	141	138	138	145,5	340	356	380	396	350	321
	№ 200	1:20	200	201	179,4	M48	177	174	174	182,5	412	432	460	480	424	388

Shortened morse taper

For many applications, the length of the Morse taper has proven to be excessive. Therefore, nine standard sizes of shortened Morse tapers were invented, obtained by removing the thicker part of the Morse taper. The number in the designation of the short cone is the diameter of the new thick part of the cone in mm. Russian standard for shortened cones GOST 9953-82 “Short tool cones. Basic dimensions. "

• B7- shortened to 14 mm KM0.
• B10, B12- shortened to 18 and 22 mm, respectively KM1.
• B16, B18- shortened to 24 and 32 mm, respectively KM2.
• B22, B24- shortened to 45 and 55 mm, respectively KM3.
• B32- shortened to 57 mm KM4.
• B45- shortened to 71 mm KM5.

NORMAL ANGLES
(GOST 8908-81)

& nbsp The table does not apply to angular dimensions cones. When choosing corners, the 1st row should be preferred to the 2nd, and the 2nd to the 3rd.

NORMAL CONES and ANGLES OF CONES
(GOST 8593-81)

& nbsp The standard applies to the taper and taper angles of smooth tapered elements of parts.

& nbsp Note. The values ​​of the taper or angle of the taper indicated in the column "Designation of the taper" are taken as initial values ​​when calculating other values ​​given in the table. When choosing tapers or taper angles, row 1 should be preferred over row 2.

TOOL CONES, SHORT
(GOST 9953-82)

& nbsp The standard applies to shortened Morse taper tool tapers.

& nbsp * z is the largest permissible deviation of the position of the main plane in which the diameter D is located from the theoretical position.
& nbsp ** dimensions for reference.

Designation cone	Cone Morse	D	D 1	d	d 1	l 1	l 2	a, no more	b	c
B7	0	7,067	7,2	6,5	6,8	11,0	14,0	3,0	3,0	0,5
B10 B12	1	10,094 12,065	10,3 12,2	9,4 11,1	9,8 11,5	14,5 18,5	18,0 22,0	3,5 3,5	3,5 3,5	1,0 1,0
B16 B18	2	15,733 17,780	16,8 18,0	14,5 16,2	15,0 16,8	24,0 32,0	29,0 37,0	5,0 5,0	4,0 4,0	1,5 1,5
B22 B24	3	21,793 23,825	22,0 24,1	19,8 21,3	20,5 22,0	40,5 50,5	45,5 55,5	5,0 5,0	4,5 4,5	2,0 2,0
B32	4	31,267	31,6	28,6	-	51,0	57,5	6,5	-	2,0
B45	5	44,399	44,7	41,0	-	64,5	71,0	6,5	-	2,0
Dimensions D 1 and d are theoretical, resulting respectively from the diameter D and the nominal dimensions a and l 1

TAPER OF OUTER AND INNER CONES
AND CONES WITH THREADED HOLE

INSTRUMENTAL MORSE AND METRIC EXTERNAL CONES
(GOST 25557-2006)

A type cone	Metric		Morse							Metric
Identifier	4	6	0	1	2	3	4	5	6	80	100	120	160	200
D	4,0	6,0	9,045	9,065	17,78	23,825	31,267	44,399	63,348	80	100	120	160	200
D 1	4,1	6,2	9,2	12,2	18,0	24,1	31,6	44,7	63,8	80,4	100,5	120,6	160,8	201,0
d *	2,9	4,4	6,4	9,4	14,6	19,8	25,9	37,6	53,9	70,2	88,4	106,6	143	179,4
d 1	-	-	-	M6	M10	M12	М16	M20	M24	M30	M36	M36	M48	M48
d 4 max	2,5	4,0	6,0	9,0	14,0	19,0	25,0	35,7	51,0	67,0	85,0	102,0	138,0	174,0
l min	-	-	-	16,0	24,0	24,0	32,0	40,0	47,0	59,0	70,0	70,0	92,0	92,0
l 1	23,0	32,0	50,0	53,5	64,0	81,0	102,5	129,5	182,0	196,0	232,0	268,0	340,0	412,0
l 2	25,0	35,0	53,0	57,0	69,0	86,0	109,0	136,0	190,0	204,0	242,0	280,0	356,0	432,0
l 11	-	-	-	4,0	5,0	5,5	8,2	10,0	11,5	-	-	-	-	-
* - size for reference. - the angle of the Morse tapers # 0-# 5 corresponds to the angle of the shortened Morse tapers; No. 6 - 1: 19.180 = 0.05214 - angle of metric cones - 1:20 = 0.05.

& nbsp The profile of the threaded hole corresponds to the hole in the center shape R on GOST 14034-74.

& nbsp In GOST 25557-2006, all dimensions of the center hole are given in common table... The standard also specifies the dimensions of the groove and bore slots required for the construction of tapers when a cutting fluid (coolant) is supplied through the tool.

& nbsp Depending on the design, the tool shank may have a corresponding designation:

BI- inner cone with a groove;
BE- outer cone with a foot;
Ai- inner cone with a hole along the axis;
AE- outer cone with threaded hole along the axis;
BIK- inner cone with a groove and a hole for coolant supply;
CENTURY- outer cone with foot and hole for coolant supply;
AIK- inner cone with an axial hole and a hole for coolant supply;
AEK- external cone with a threaded hole along the axis and a hole for coolant supply.

INSTRUMENTAL MORSE CONES AND METRIC INTERNAL
(GOST 25557-2006)

INTERNAL AND EXTERNAL CONES WITH A 7: 24 TAPER
(GOST 15945-82)

& nbsp Tolerances of inner and outer tapers 7:24 according to GOST 19860-93.

INSTRUMENT CONES
Limit deviations of the angle of the cone and tolerances of the shape of the cones
(GOST 2848-75)

& nbsp Degree of Accuracy tool cones denoted by the tolerance of the angle of the cone of a given degree of accuracy in accordance with GOST 8908-81 and is determined by the maximum deviations of the angle of the cone and the tolerances of the shape of the surface of the cone, numerical values which are listed below.

& nbsp Notes:
& nbsp 1. Deviations of the angle of the cone from the nominal size by placing in "plus" - for external cones, in "minus" - for internal ones.
& nbsp 2. GOST 2848-75 for outer cones also provides for the degrees of accuracy AT4 and AT5. Tolerances in accordance with GOST 2848-75 apply to tool cones in accordance with GOST 25557-2006 and GOST 9953-82.

& nbsp An example of the designation of a Morse taper 3, degree of accuracy AT8:

Morse 3 AT8 GOST 25557-2006

& nbsp The same metric cone 160, degree of accuracy AT7:

Meter. 160 AT7 GOST 25557-2006

& nbsp The same of the shortened cone B18, degree of accuracy AT6:

Morse B18 AT6 GOST 9953-82

Related documents:

GOST 2848-75: Tool cones. Tolerances. Methods and controls
GOST 7343-72: Tool tapers with a taper of 1:10 and 1: 7. Dimensions (edit)
GOST 10079-71: Conical reamers with a tapered shank for Morse tapers. Design and dimensions
GOST 22774-77: Grinding cones and tubes. Types and sizes
GOST 25548-82: Basic standards of interchangeability. Cones and conical connections. Terms and Definitions

GOST 25827-93
(ISO 7388-1-83)

Group G27

INTERSTATE STANDARD

TOOL SHAKS WITH CONE 7:24

Dimensions (edit)

Tool shanks with 7/24 taper. Dimensions

OKP 39 2800

Date of introduction 1995-01-01

Foreword

1 DEVELOPED by the State Standard of Russia

INTRODUCED by the Technical Secretariat of the Interstate Council for Standardization, Metrology and Certification

2 ADOPTED by the Interstate Council for Standardization, Metrology and Certification on October 21, 1993

Voted for adoption:

State name	Name of the national authority on standardization
Republic of Kyrgyzstan	Kyrgyzstandard
The Republic of Moldova	Moldovastandart
the Russian Federation	Gosstandart of Russia
The Republic of Tajikistan	Tajikstandart
Turkmenistan	Turkmenglav State Inspection

3. The standard complies with the international standard ISO 297-88 in terms of the dimensions of the shanks of tools with a taper 7:24 and fully complies with ISO 7388-1-83

4 INTRODUCED TO REPLACE GOST 25827-83 and GOST 24644-81 in the part of mandrels with a taper 7:24

INFORMATION DATA

REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

	Item number

This standard applies to tool shanks with a 7:24 taper for manual and automatic tool changing.

The requirements of this standard are mandatory, except for those set out in notes 3 and 4 to table 1 and in the notes to tables 2-4.

1. Tool shanks must be manufactured in the following versions:

1 - for manual change of tools with tapers from 30 to 80;

2 and 3 - for automatic tool change with tapers from 30 to 50.

2. The dimensions of the tool shanks must correspond to:

execution 1 - indicated in drawing 1 and in table 1;

execution 2 - indicated in drawing 2 and in table 2;

execution 3 - indicated in drawing 3 and in table 3.

Note. Tools with shanks version 3 - for equipment designed before 01/01/94.

Damn 1. Tool shank sizes. Execution 1

_________________

1 - the main plane; 2 - tool attachment area

Table 1

Cone designation tool shank

Sky- lee

Sky- lee

± 0.1 (± 0.5)

± 0.2 (± 0.4)

Not me- her

Sky- lee

_________________
* Dimensions for reference.

Dimensions are in accordance with ISO 297-88, except for dimensions in parentheses (see appendix)

Notes:

1. Dimensions in brackets for machines designed before 01/01/94.

2. The dimensions,, apply to tools for which a clamp is provided on the front of the flange.

3. Exit groove grinding wheel- in accordance with GOST 8820. It is allowed to manufacture shanks without a groove for the exit of the grinding wheel between the base diameter and the flange. In this case, the diameter of the cylindrical transition surface =.

4. By agreement with the consumer, it is allowed to increase the size to values ​​equal to the diameter of the outer surface of the spindle end in accordance with GOST 30064-93.

Damn 2. Execution 2

_________________
* Limit deviation of the position of the main plane.



*** The size is for reference.

1 - the main plane; 2
cutting edge of the tool; 3 - measuring roller; 4 - tool attachment area

table 2

No more

, not less

_________________
* Shank sizes in accordance with ISO 7388-1-83 (see appendix).

Notes:

1. The size of the diameter of the cylindrical part must satisfy the following relationship:

GOST 8820. The groove width for cones 30 and 40 is 1.6 mm, for cones 45 and 50 - 3.0 mm;

- an increase in size, provided that the ratio is fulfilled, while the grooves for the key with a width can be blind with parallel sides with a length of at least a value;

Damn. 3. Execution 3

_________________
* Limit deviation of the position of the main plane.

** Dimensions determine the space for the grip of the tool.

1 - the main plane; 2 - datum for position determination
cutting edge of the tool; 3 - measuring roller

Table 3

Tool shank taper designation

No more

No less

No more

Notes:

1. The groove for the exit of the grinding wheel - in accordance with GOST 8820.

2. By agreement with the consumer, it is allowed:

- make a groove between the base diameter and the flange for the exit of the grinding wheel with a depth in accordance with GOST 8820, the width of the groove for cones 30 and 40 is 1.6 mm, for cones 45 and 50 - 3.0 mm;

- an increase in size to a value not exceeding:, while the grooves for a key with a width can be made blind with parallel sides with a length not less than a value;

- making a groove with a size.

3. The dimensions and shape of the center hole must correspond to those indicated in drawing 4 and in table 4.

Damn 4. The dimensions and shape of the center hole. Executions 1, 2

________________
* Dimensions for reference.

** For manual tool change - as agreed with the consumer.

4. Unspecified limit deviations sizes: Н14, h14, ±

5. The degree of accuracy of the cones AT4, AT5, the tolerances of the angle and shape of the cone - in accordance with GOST 19860. The deviation of the taper angle from the nominal should be placed in "plus".

6. Surface hardness of the tapered part of the shanks - 51 ... 57 HRC.

Table 4

Tool shank taper designation		, no more	, no more		, not less	, not less			6H (7H)

Notes:

1. Dimension in brackets for machines designed before 01/01/94.

2. For machines with manual tool change, it is allowed to use the H9 tolerance field for the size, the maximum size deviation is not regulated.

3. The groove for the exit of the grinding wheel (item 1) - as agreed with the consumer.


Example symbol shank version 2 with taper 30:

Shank 2-30 GOST 25827-93

APPENDIX (reference). CONFORMITY OF THIS STANDARD WITH INTERNATIONAL STANDARDS ISO 297-88, ISO 7388 / 1-83

APPENDIX
Reference

CONFORMITY OF THIS STANDARD WITH INTERNATIONAL STANDARDS
ISO 297-88, ISO 7388 / 1-83

The sizes of shanks of tools with a taper 7:24 for manual tool change, established in this standard, fully cover the nomenclature of their sizes according to the international standard ISO 297-88 and are shown in Fig. 1 and in table 1; for automatic tool change - fully comply with ISO 7388-1-83 and are shown in Fig. 2 and in Table 2.

In addition, the standard includes requirements for the dimensions of shanks of tools with a taper 7:24 for automatic tool change (version 3), which are not provided for by international standards, requirements for the degrees of accuracy of shanks, tolerances for taper angle and shape tolerances, surface hardness of the taper of the shank.



The text of the document is verified by:
official publication
M .: Publishing house of standards, 1994

INTERSTATE STANDARD

TOOL SHAKS WITH CONE 7:24

Official edition

INTERSTATE COUNCIL FOR STANDARDIZATION. METROLOGY AND CERTIFICATIONS Minsk

Foreword

1 DEVELOPED by the State Standard of Russia

INTRODUCED by the Technical Secretariat of the Interstate Council for Standardization, Metrology and Certification

2 ADOPTED by the Interstate Council for Standardization,

3. The standard complies with the international standard ISO 297-88 in terms of the dimensions of the shanks of tools with a taper 7:24 and fully complies with ISO 7388-1-83

Execution 1

Limit deviation of the position of the main plane.

/ - basic plane; 2 - tool attachment area

Dimensions for reference

Dimensions are in accordance with ISO 297-88. other than sizes.

Table 1
t. no Sole L * "s ■ eeee no more
enclosed in brackets (see appendix)

Notes:

1. Dimensions in brackets for machines designed before 01/01/94.

2. Dimensions a, D 2, / apply to tools for which a clamp is provided on the front of the flange.

3. The groove for the exit of the grinding wheel - in accordance with GOST 8820. It is allowed to manufacture shanks without a groove for the exit of the grinding wheel between the base diameter and the flange. In this case, the diameter of the cylindrical transition surface is D ^ = D ~ o.5.

4. By agreement with the consumer, it is allowed to increase the size D t to values ​​equal to the diameter of the outer surface of the spindle end in accordance with GOST 30064-93.

* Limit deviation of the position of the main plane.

** Dimensions determine the space for the grip of the tool.

It. not less

Shank sizes in accordance with ISO 7388-1-83 (see appendix).

Notes:

1. The size of the diameter of the cylindrical part /) 5 must satisfy the following relationship:

Make a groove between the base diameter and the flange for the exit of the grinding wheel in depth according to GOST 8820. The groove width for tapers 30 and 40 is 1.6 mm. for cones 45 and 50 - 3.0 mm;

Increasing the size /, provided that the ratio is fulfilled, the grooves for the key with width b can be non-continuous with parallel sides with a length of at least / 44

Notes:

1. The groove for the exit of the grinding wheel - in accordance with GOST 8820.

2. By agreement with the consumer, it is allowed:

Make a groove between the base diameter and the flange for the exit of the grinding wheel with a depth according to GOST 8820, the width of the groove for cones 30 and 40 is 1.6 mm, for cones 45 and 50 - 3.0 we;

Increasing the size / to a value not exceeding: / + L, while the grooves for a key with a width b can be made blind with parallel sides with a length of at least /;

Making a groove with size / a.

3. The dimensions and shape of the center hole must correspond to those indicated in fig. 4 and in table. 4.

4. Unspecified limit deviations of dimensions: Н14, Н4, IT 14

5. The degree of accuracy of the cones AT4, AT5, the tolerances of the angle and shape of the cone - in accordance with GOST 19860. The deviation of the taper angle from the nominal should be placed in "plus".

6. Surface hardness of the tapered part of the shanks - 51 ... 57 HRC ,.

Often the buyer, when ordering an auxiliary tool for the machine, is convinced that by specifying "spindle with taper SK40" when ordering, he will definitely get what he wants. When the tool he bought does not fit the machine, the customer is extremely surprised: “How is it, I used to buy an SK40 mandrel with a 7:24 taper and had no problems, but now I bought the same SK40, and he suddenly does not fit. " Let's try to understand the situation.

The customer is both right and wrong. The main problem lies in the designation itself. The letters SK denote only the taper of the arbor shank and are an abbreviation for the German Steilkegel - steep taper. In this case, a steep taper refers to mandrels with a taper of 7:24. Thus, by specifying SK when ordering, the customer only specifies the shank type. Other common types of shanks in machine tool construction are the HSK short hollow taper, MK Morse taper, modular systems KM and Capto. The number 40 indicates the shank size. In this part, the reserve indicated everything correctly. His mistake lies in the fact that in addition to the type and size of the shank, it is necessary to indicate the standard according to which the shank is made.
In the USSR, there was GOST 25827-83 "Tool shanks with a taper 7:24". Due to the fact that this GOST did not correspond to any of the existing international standards, in 1992 it was revised. Many significant changes and additions were made - and it began to fully comply with the ISO 7388 / 1-83 standard. The “new” GOST was assigned a new Russian number - GOST R 50071-92. At the same time, the old GOST of 1983 was completely "lost", as a result of which in 1993 it was revised again. It was decided to return the old, familiar to everyone, number GOST 25827, and the Russian GOST R 50071-92 (which was issued "instead of GOST 25827-83 and GOST 24644-81 in terms of mandrels with a taper 7:24") was canceled. Thus, in Russia today there is only one GOST 25827-93 "Tool shanks with a taper 7:24".
In this GOST, three versions of shanks are standardized:

1. Type 1 shanks are used for machines with manual tool change and comply with DIN 2080.
2. As for "version 2" - for machines with automatic tool change, they comply with ISO 7388 / 1-83 standard, which coincides with DIN 69871.
3. According to "version 3" (also for automatic tool change) they do not correspond to any Western counterparts and have a note: "tools with shanks for equipment up to 01.01.94".

This is all in our country. What is the situation abroad?
Today in Europe, the most common shanks with execution according to DIN - the German standard, on the basis of which was created international standard ISO. Shanks with the MAS BT execution (Japanese standard JIS B 6339) prevail on Japanese machines. Machine tools with spindles according to this standard are becoming more and more widespread in Europe, respectively, the range of auxiliary tools with this type of connection is expanding. Auxiliary tools with CAT / ANSI shanks are common in America. Some firms make machines with attachment to the spindle own design(for example Mazak). What are the fundamental differences between these liners? The article contains sketches of some standard shanks and tables with basic dimensions.

Most European machine tools use an auxiliary tool according to DIN 69871 (ISO 7388 / 1-83). There are three versions in this standard:

• form "A" - without a central hole for coolant supply (corresponds to Russian GOST 25827-93, version 2);
• form "AD" - with a central hole for supplying coolant through the center of the spindle;
• form "B" - with side holes for coolant supply, located at the end of the flange for gripping the manipulator.

Form "AD" is similar to form "A", only with a through center hole.
Execution "B" is structurally different from different firms, but the functions remain unchanged.
Version 1 in accordance with GOST 25827-93 (for manual tool change) today fully complies with DIN 2080.
Many machines of domestic and Western production today are focused specifically on DIN (ISO), less often machines with a spindle design for MAS BT. Most companies that produce auxiliary tools (including Russian ones) offer a full range of both standards.
When buying a machine, it is still better to once again clarify which version of the spindle is offered to the customer. Often, machine tool manufacturers indicate only the standard size of the auxiliary tool without specifying what standard the spindle is made according to. If there is a choice, then it is better to choose a machine with an auxiliary tool that is already used in your company. If a company offers without an alternative a machine with a spindle type that was not previously used in your production, it is better to contact the company offering the appropriate auxiliary tool and ask them how wide the range of tools of this standard is available. Otherwise, you will have to search for a long time for the source of acquiring the necessary auxiliary tool.
With all the variety of the considered auxiliary tool, there is partial interchangeability. All tools of the same size have the same basic bore diameter and approximately the same basic length. Most often, the difficulty arises only with an automatic tool change, when the mandrel is taken by the manipulator from the magazine of the machine. Tools of different standards have different shapes and sizes of the groove for the grip of the manipulator, as well as different distance from the spindle datum plane to the groove axis. With a manual change, this problem does not arise. Since each standard has its own form of rod for clamping the mandrel in the machine spindle, it is necessary to check whether the rod of this standard can be used on this machine, or if a special transition rod needs to be made. It is with the help of transition rods that an auxiliary tool made according to DIN 69871 can be fixed on a machine with a spindle according to GOST 25897-93 version 3. It is also recommended to check the basic length of the cone, since it is different standards is also slightly different.