Sincro Tapping Attachments technical information

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Assembly Instructions

Overall Length

Order Example

Tightening torque table

Vergnano Sincro Tapping Attachments

Vergnano Sincro synchronous tapping attachments are specifically designed to enhance the performance of the Vergnano S-Series taps for synchronous tapping processes.

Synchronous Tapping Attachments

In modern CNC machine tools with synchronous spindles, the rotational and axial movements of the spindle are coordinated by the numeric control of the machine. On these modern machine tools standard compensated tapping attachments are not recommended since the large compensation in extension can negatively influence the performance of the tool. Vergnano Sincro synchronous tapping attachments are specifically designed for synchronous tapping: micro-compensation reduces the axial and radial forces generated during the tapping process and enhances tool life. Since machine, tapping attachment and tool are synchronised it is possible to reach high machining speeds. This advantage, together with increased tool life, leads to improved productivity.

Compensation difference in conventional and synchronous tapping

Compensation difference in conventional and synchronous tapping

Requirements for Synchronous Tapping

  • CNC machine with synchronised rotational and axial movements of the spindle.
  • Spindle with sufficient rotational speed in order to reach the requested cutting speeds also with small diameter taps.
  • Synchronous tapping attachment with micro-compensation.
  • In order to work at the requested cutting speed during the entire machining process, the spindle must be able to accelerate to the full final speed before the tapping process begins.

Technical Features

The new Vergnano synchronous tapping attachments have an innovative quick-change adaptor system and are characterised by a differential compensation in traction and compression.

Quick-Change System

Quick-Change System Vergnano offers a new system consisting in tapping attachment and quick-change adaptor which allows worn tools to be substituted without changing the entire tapping attachment thereby saving precious machining time.
It is recommended to have a second quick-change adaptor (in addition to that delivered with the tapping attachment) sold separately to exploit this advantage.

Also available are extended quick-change adaptors which permit extension of the tapping attachment in order to reach threads in difficult positions.

This versatile and cost-saving system covers a wide range of applications with just one tapping attachment.
Extended Quick-Change Tap adaptor

The extended adapter is sold assembled and consists of two parts (adaptor and terminal adaptor). Further extensions are available on request.

Micro-Compensation

Tapping attachment axial forces measurement

During tap reversal high axial forces are generated on the tap which cause mechanical stresses and micro-wear. This in turn leads to reduced tool life and tool precision.
For this reason Vergnano synchronous tapping attachments are designed with differential micro-compensation in traction and compression which compensates the stresses on the tap.
Compensation in traction (1 mm) is obtained by steel springs which guarantee greater reliability while compensation in compression (0,2 mm) is obtained by elastomer rings.

Micro-Compensation
Quick-Change Tap adaptor with Setting Screws

Quick-Change Tap adaptor with Setting Screws

Setting screws on the quick-change adaptors allow the use of standard ER collets without square drives further limiting purchasing costs.

Through Coolant Capability

Through Coolant Capability

All Vergnano synchronous tapping attachments are designed for use with internal lubrication up to 50 bars. For higher values a special pressure-tight nut screw is available on request. The special attachment design forces the through coolant to enter the tap adaptor from the sides without interfering with the compensation length.

Advantages

  • Reduced machining cycle times, due to higher cutting speeds.
  • High tool life.
  • High quality threads.
  • Cost reduction due to versatile system with one tapping attachment and multiple Quick-Change adaptors.
Comparative test with tap S17 M12x1,5 TiN
Workpiece: Wheel hub Material: 38MnVS6+P (M.G. P.5)
Hole: Through Thread depth [mm] 14
Lubrication: Minimal lubrication Vc [m/min] 25
Machine: Stama MC10014 Tapping direction: Vertical
Tapping attachment: Rigid standard vs Vergnano Sincro
Rigid vs Sincro tapping performances chart

Assembly Instructions

Assembly Instructions
  1. Place the quick-change adaptor in the assembly support
  2. Insert the ER collet in the nut screw
  3. Partially tighten the nut screw on the quick-change adaptor
  4. Insert the tap in the quick-change adaptor until it stops
  5. Lightly tighten the nut screw to clamp the tap shank
  6. Tighten the setting screws on the tap square
  7. Securely tighten the nut screw with a wrench
  8. Check that setting screws are not too tight
  9. Insert the quick-change adaptor into the tapping attachment by pulling back the sleeve

Overall Length of Tapping Attachment Assembly

Overall Length of Tapping Attachment Assembly

In the example below, the overall assembly length of the tapping attachment with a mounted tap is shown. This calculation is useful to avoid collisions (*).

Tapping Attachment - DIN 69893 HSK A

Article Code Attachment
ØD1 [mm]
Tap Size L
[mm]
ØD
[mm]
Ød
[mm]
ER Collet L1
[mm]
LTOT
[mm]
VA01A06302CH160 HSK-A63 M3 - M12 64 43 20 ER 16 24 88

Quick-Change Adaptor ER 16

Article Code Tap Size ShaftØ
f[mm]
Ød
[mm]
ØD
[mm]
L1
[mm]
L2
[mm]
CHADAP160310000 M3 - M12 03 - 10 20 28 24 37

Machine Tap M8 S15

Ød1

[mm]
P

[mm]
L1
js 16
[mm]
L2

[mm]
L3

[mm]
Ød2
h6
[mm]
a
h12
[mm]
z

[-]
preforo
[mm]
M8 1,25 90 12,5 35 8 6,2 3 6,8

Overall assembly length (L3) = (L1-L2) + LTOT

Order Example

1 - Choose tapping attachment

DIN 69893 HSK A
1 - Choose tapping attachment
Article Code Attachment
ØD1 [mm]
Tap Size L
[mm]
ØD
[mm]
Ød
[mm]
ER Collet L1
[mm]
LTOT
[mm]
VA01A06302CH160 HSK-A63 M3 - M12 64 43 20 ER 16 24 88

2 - Choose ER Collet

DIN 6499
2 - Choose ER Collet
Article Code Ød1
[mm]
ER Collet
COERWS1604_*_000 03 - 10 ER 16

3 - Choose assembly support

QUICK-CHANGE ADAPTOR
3 - Choose assembly support
Article Code ER Collet Ød
[mm]
ASCHADAP1620000 ER 16 20

4 - Choose Quick-Change Tap adaptor
     (Optional - Requested only for Tap Quick-Change)

ASSEMBLY SUPPORT
4 - Choose Quick-Change Tap adaptor<br />     (Optional - Requested only for Tap Quick-Change)
Article Code Tap Size ShaftØ
f[mm]
Ød
[mm]
ØD
[mm]
L1
[mm]
L2
[mm]
ER Collet
CHADAP160310000 M3 - M12 03 - 10 20 28 24 37 ER 16

Tightening torque table

It is recommended to tighten the nut screws with the torque values shown in the table below.



ER Collet Torque [Nm]
ER 16 45
ER 25 70
ER 40 150




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