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GRN-NC-08/HD GRN-NC-11/HD GRN-NC-20/HD GRN-NC-25/HD

Date of edition: Stage of alteration:

01.04.2007 1

50 042007 EF • Rev. A

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Nürnberger Straße 96-100 · 91207 Lauf · GERMANY · Tel. +49 (0) 9123 / 186-0 · Fax +49 (0) 9123 / 14313




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Operating instruction for the tapping attachments type GRN-NC

152

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC

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1.1 1.2 1.3 1.4

Application range, determined use .......................................................................... 155 Specifications .......................................................................................................... 156 Safety instructions................................................................................................... 156 Dimensions and technical data................................................................................ 157

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2.1 2.2 2.2.1 2.3 2.3.1 2.3.2 2.3.3 2.4 2.4.1 2.4.2

Unpacking ............................................................................................................... 158 Installation of the tapping attachment ...................................................................... 158 Coolant supply................................................................................................... 159 Collets ..................................................................................................................... 160 Application......................................................................................................... 160 Assembly instruction of collets........................................................................... 160 Remove tap and clamping nut ........................................................................... 162 Sealing disks for clamping nuts ............................................................................... 163 Application......................................................................................................... 163 Assembly instruction for sealing disks into clamping nuts .................................. 163

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3.1 3.2 3.3 3.4

Maintenance schedule ............................................................................................ 164 External cleaning..................................................................................................... 164 Refill with grease..................................................................................................... 164 Principal maintenance ............................................................................................. 165

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6.1 6.2

Example of the traverse movement z to be programmed ........................................ 167 Example of programming a thread cutting cycle ...................................................... 167

Edition: 01.04.2007

153

Operating instruction for the tapping attachments type GRN-NC

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This operating instruction uses the following symbols:

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Marks special instructions, rules and prohibitions, which are important in order to avoid any damage. Please observe these instructions!

Marks application tips and other useful information.

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Sectional view: Tapping attachment GRN-NC

154

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC 



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The tapping attachments type GRN-NC are mainly used on CNC-controlled machines. The change of the tapping direction is actioned automatically via the reversing of the feed and an integral reversing gear mechanism. The tapping attachments may only be used in connection with driven machine spindles and are only VXLWHGWRFXWULJKWKDQGWKUHDGV. Normally the tapping attachments are equipped with a cylindrical shank Ø25 acc. to DIN1835 B+E. For the cutting range of each type please refer to table 1, page 157. The tap is locked via collets acc. to DIN6499. The collets must be chosen depending on the type of tapping attachment and tap used, please refer to chapter 2.3.1, page 160. The tapping attachments are suited for coolant pressures up to 50 bar. The type GRN-NC 08 is provided with a device for external coolant supply, the attachments GRN-NC 20 and 25 have internal coolant supply. The tapping attachment GRN-NC 11 is available either with a device for external or alternatively for internal coolant supply, see picture 1, page 157. A standard stop fixture is included with each tapping attachment. By supplying details of the machine when ordering, see chapter 2.2, page 158, the correct adaptation of the stop fixture to your machine spindle can be ensured.

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Edition: 01.04.2007

155

Operating instruction for the tapping attachments type GRN-NC 

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Owing to the integrated reversing gear mechanism, the change of the rotating direction of the machine spindle when reversing is eliminated. The resulting advantages are as follows: Time-saving by shorter cycle times Constant cutting speeds = higher tool life Protection of the machine Energy-saving by nearly constant power adaptation Further equipment features are: Installed damping elements compensate the resulting cutting forces and guarantee maximum tool life. The cylindrical shank acc. to DIN 1835 B+E allows an easy adaptation to any machine spindle type via an adaptation shank. Adaptation shanks may be taken from our EMUGE main catalogue.



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For all works, ie putting into operation, production and maintenance, please observe the details given in the operating instruction. All relevant safety regulations as well as local instructions are to be observed when working with the tapping attachments. Below please find some basic rules:

156

-

Please wear gloves during change of tool to avoid injury.

-

Basically change the tool yourself to avoid the sudden start of the spindle caused by mis-operating.

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Hold the tool when loosening the tool clamping to avoid it falling down and damaging of the tool and the workpiece.

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Please keep the tool adaptation clean.

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There are maximum values for cutting speeds and feeds for every kind of machining. Please observe such data.

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Please observe the maximum tool dimensions.

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Furthermore, the instructions of the tool manufacturers are valid.

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC 

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Picture 1: Dimensions of the tapping attachments GRN-NC

Table 1: Technical data of the tapping attachments GRN-NC Type

*511&

Article no. F3390997

+' *511&

F3391997

+' *511&

F3391995

+' *511&

F3392997

+' *511&

F3394997

Tap range

Shank receipt

[min ]

M1 – M4 (No.0-No.6) M2 – M7 (No.0-No.12) M2 – M7 (No.0-No.12) 2 M4 – M12 (No.8-3/8“) M8 – M20 (5/16“-13/16“)

+'

max. Collet 1 size revolution –1

8

6000

11

3500

11

3500

20

2500

25

1500

D25 DIN 1835 B+E D25 DIN 1835 B+E D25 DIN 1835 B+E D25 DIN 1835 B+E D25 DIN 1835 B+E

D

D2

L

G

H T Coolan t * * supply

*

*

*

*

12

80

96,5

2

19

80

105

2

19

80

123

2

34

80

138

3,5 3 7 Internal

42

80

142,2 3,5 3 7 Internal

4 5

Extern al 2 5 Extern al 2 5 Internal

* Data in mm

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The tapping attachments are made for coolant pressures up to 50 bar.

1 2

Dimensions acc. to DIN 6499 It is possible to cut M3 threads with cylindrical collets (Article No. F0943020.4)

Edition: 01.04.2007

157

Operating instruction for the tapping attachments type GRN-NC 

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In order to guarantee the function of the reversing gear mechanism in the tapping attachment, the housing must be secured against twisting. This is executed by the stop fixture mounted at the housing. The adaptation to the machine is normally made when ordering by indicating the machine type. A standard fixture is part of the normal delivery. The standard dimensions may be taken from picture 1, page 157. 

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Remove cardboard, filling material and film Clean the tapping attachment with a duster to remove any conservation oil. ,PSRUWDQW

Do not use any aggressive solvents. Do not use fibrous materials i.e. steel wool. 

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It is a must to load the complete tapping attachment into the machine manually for the first time in order to check the correct position of the fixture. Description see point 1 - 5.

1. Holding pin is engaged in the fixing ring 2. Loosen locking screw

A

3. Load tapping attachment manually into the machine

D

4. The stop bolt must engage in the block of the machine, twist the housing until the holding pin is disengaged from the fixing ring

1 mm

5. Secure fixing ring in this position by tightening the locking screw. ⇒ The holding pin engages in the fixing ring again when removing the tapping attachment

Picture 2: Stop fixture

158

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC

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Owing to the stop fixture it is possible that a second tool place in the tool exchanger may be required. It is therefore that before the putting into operation a manually operated trial run must be carried out. ⇒ The tapping attachment is ready for cutting. The position is fixed; the attachment may be changed into or taken from the machine spindle via the tool changer.

These instructions are valid for the first time of operation and for subsequent operations. For subsequent operations please carry out the following function check: Check compensation on tension by pulling down the clamping head and releasing it. When released the clamping head must return to its initial position. Test the stop fixture by pulling down the stop fixture bolt and releasing it.



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a) For VL]HVand the connection may be executed via the stop fixture bolt and the supplied coolant pipe. b) For VL]HV  and  the connection is carried out automatically to the internal coolant supply by loading the tapping attachments into the machine spindle. The coolant is directed through the tapping attachment. c) If the machine is only equipped with an external coolant supply, for example with nozzles or pipes, these are to be positioned onto the tool cutting edge. ,PSRUWDQW

Please avoid any contact between tool and coolant supply!

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The tapping attachment size 11 may be ordered with coolant supply either via the stop block or through the tapping attachment, see table 1.

Edition: 01.04.2007

159

Operating instruction for the tapping attachments type GRN-NC 

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The adaptation of the tap is executed via collets type ER and ER/GB. With collets type ER, the tap is centred and clamped via the clamping diameter. With collets type ER/GB, the torque – arising during the thread cutting process – is additionally transferred via the square integrated in the collet. Owing to the better torque transmission, we would recommend to use collets type ER/GB. The appropriate collet sizes for the tapping attachments may be taken from table 1, page 157. The clamping diameter is indicated by the tap used.



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If you work with internal coolant supply, the clamping nut must first be inserted into the sealing disk.

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The taper surface of the clamping nut and of the collet must be clean!

1. Insert collet into clamping nut 2. Tilt collet. For clamping nut type 80(5 and ,&(5: Groove of the collet must engage in the eccentric ring of the clamping nut. Tilt collet in opposite direction until it is flush with the clamping nut or the sealing disk, see Picture 3. Groove

Collet engaged in clamping nut

Eccentric ring Picture 3: Assembly of the collet into the clamping nut type UM/ER or IC/ER

160

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC For clamping nut type +L4(5 and +L4(5&: The groove of the collet must engage in the eccentric ring of the clamping nut at the marked position. Tilt collet in opposite direction until it clearly engages, see Picture 4. → Collet is flush with the clamping nut or the sealing disk

Groove Collet engaged in clamping nut

Eccentric ring Marked position (Position depends on type of nut) Picture 4: Assembly of the collet into the clamping nut type Hi-Q

3. Screw the engaged collet with the clamping nut manually onto the thread of the tapping attachment. We recommend to screw the clamping nut with engaged collet onto the thread vertically from underneath in order to avoid the collet sliding out. ,PSRUWDQW: Only mount clamping nuts with correctly engaged collet.

4. Insert tap. ,PSRUWDQW: If collet and tap are provided with a square, the tap must be turned into position in order to be inserted into the square of the collet.

5. Tighten the clamping nut with the appropriate wrench. The tightening torques for the clamping nut may be taken from table 2. ,PSRUWDQW: In order to avoid any damage of parts in the tapping attachments, it is necessary to support the spindle with the open-ended spanner d when tightening the clamping nut with the wrench c, see picture 4. The wrenches are part of the delivery.

Edition: 01.04.2007

161

Operating instruction for the tapping attachments type GRN-NC

Table 2: Tightening torques for the clamping nuts PD[WLJKWHQLQJ

Type

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EMUGE GRN-NC11/HD

UM/ER 8 UM/ER 11 Hi-Q/ER(C) 11 Hi-Q/ERC 20 Hi-Q/ERC 25

pmax: 50 bar nmax: 3500 1/min

M2-M7 F3391997

1

[Nm] 10 30 18 40 130

2

Picture 5: Tightening the clamping nut



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1. Loosen the clamping nut with the appropriate wrench ,PSRUWDQW: In order to avoid any damage of parts in the tapping attachments, it is necessary to support the spindle with the open-ended spanner d when loosening the clamping nut with the wrench c, see picture 4. The wrenches are part of the delivery.

2. Pull out the tap 3. Screw the clamping nut off 4. For clamping nuts type 80(5 and +L4(5&: Remove collet by tilting it. For clamping nuts type +L4(5 and +L4(5&: Tilt collet up to the marking until it is removed from the eccentric ring. Remove collet.

Marked position (Position depends on type of nut)

Picture 6: Detach the clamping nut

162

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC 

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The sealing disks are inserted into the clamping nuts for cutting threads with internal coolant supply (max. coolant pressure: 50 bar). The sealing disks additionally avoid the penetration of dirt and chips into the collet slots. 

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1. Insert the sealing disk into the clamping nut as shown on picture 5. 2. Pull the sealing disk forward in the clamping nut until you clearly hear the engagement. The sealing disk must be flush at the front with the clamping nut.

Labelling

Picture 7: Assembly of the sealing disk

Edition: 01.04.2007

Sealing disk engaged in the clamping nut

163

Operating instruction for the tapping attachments type GRN-NC 

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External cleaning ⇒ Chapter 3.2 Refill grease ⇒ Chapter 3.3 Principal maintenance ⇒ Chapter 3.4



depends on the degree of dirt, however, Operator at least once a week every 100.000 cut threads Operator every 200.000 cut threads

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Clean the tapping attachments at periodic intervals with a duster, depending on the degree of dirt. ,PSRUWDQW

Do not use any aggressive solvent. Do not use fibrous materials i.e. steel wool.



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After approx. 100.000 cut threads, refill with1 tube of grease, art.no. F3391199.02.

1. Remove the screw 2. Refill with grease 3. Replace the screw Refill with grease Screw and sealing disc

Picture 8: Maintenance on tapping attachment

164

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC 

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According to experience a principal maintenance should be carried out after approx. 200.000 cut threads or once every 6 months, depending on rpm, thread size and material to be machined. During the principal maintenance, the attachment is disassembled, parts are checked for their degree of wear and if necessary replaced. The attachment is then reassembled, greased and fully tested. Parts list belonging to the tapping attachments are available on request.



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If the tapping attachment is taken out of service, please go through the following steps: -

Clean the tapping attachment with a duster ,PSRUWDQW

Do not use any aggressive solvents. Do not use fibrous materials i.e. steel wool. -

Spray the tapping attachment with a conservation oil to avoid any rust and to preserve the function. ,PSRUWDQW

Before storage, all evidence of coolant and machining residues must be removed!

Edition: 01.04.2007

165

Operating instruction for the tapping attachments type GRN-NC 

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(with adjusted stop fixture)

1. The tapping attachment is loaded into the machine spindle via a tool changer. The stop bolt engages in the stop block of the machine, the stop is relieved and the tapping attachment is ready for cutting. 2. The starting position is reached via the rapid traverse. The safety distance X (see chapter 6, page 167) must be considered. 3. The working cycle is run. Please consider the following points: - The turning direction of the machine needs not be changed (this is executed by the installed reversing gear mechanism). - Recommendations for programming the feed: Size 8 and 11: 98 – 100% when cutting into 101 – 105% when cutting out Size 20 and 25: 98 – 100% when cutting into 100% when cutting out - No dwell time. 4. The machine spindle is in its starting position.

Spindle movement in axial direction Turning movement of the tap

Picture 9: Running-off of a thread cutting cycle

166

Edition: 01.04.2007

Operating instruction for the tapping attachments type GRN-NC 



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z = y + x + t – 0,5G (see Picture 7, page 166)

4

z = traverse mouvement y = length of start cut of the tap x = safety distance t = thread depth to be cut G = notching movement (see indications in table 1, page 157)

To ensure the correct thread depth, we recommend programming the first depth 3mm short, then gauge the hole and reset the tool offset to the required thread depth. 

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Example of programming of a machine tool with following parameter: Tapping attachment : GRN-NC-11/HD Control: Dialog 112 Thread: M5 Thread depth: 10mm Main programme:

Sub-programme:

% O17 (GRN-NC-TAPPING ATTACHMENT) N5 (GRN-NC-TAPPING ATTACHMENT) N10 # 650 = 11.000000 (BORES – IN –X) N20 # 651 = 2.000000 (BORES – IN – Y) N30 # 652 = 6.000000 (BORE DISTANCE) N40 # 653 = 1500.000000 (RPM) N50 # 654 = 98.000000 (PERCENT – THREAD FEED) N60 # 655 = 103.000000 (PERCENT – REVERSE) N70 # 656 = 0.800000 (PITCH) N80 # 657 = 10.000000 (TRAVERSE MOVEMENT – Z) N90 # 658 = #653*#656*#654/100 N100 # 659 = #653*#656*#655/100 N200M6T30 N210S#653M3 N220G0X0Y0Z50 N230G0Z14 N240G137X0Y0I#652J#652K#650Q#651U1017 N250G0Z100 N260M30 %

% O1017 (UP-TO-GRN-NC) N10 (UP-TO-GRN-NC) N15G90 N20F#658 N30G1Z-#657 N40F#659 N50G1Z14 N55G91 N60M99 %

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Safety distance at least 11 mm by type 08 and 11 at least 14 mm by type 20 and 25 Override switch must be 100% Spindle rotation direction: only right-hand running

4

the traverse movement also depends on factors i.e. rpm and material to be machined and must therefore eventually be corrected

Edition: 01.04.2007

167

Operating instruction for the tapping attachments type GRN-NC 1RWHV 

168

Edition: 01.04.2007