Reversible Tapping Attachment TCN

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Reversible Tapping Attachment TCN


Auto Reversible Tapping Attachment TCN

Reversible Tapping Attachment: TCN

📌 Purpose:

The TCN Tapping Attachment is a versatile, auto-reversible tapping tool designed to streamline internal threading operations across a wide range of machine setups. It’s especially popular in machine shops for its ability to handle both right-hand and left-hand tapping without requiring any modifications.

🏗️ Machine Compatibility:

Model TCN Tapping Attachment can be seamlessly mounted on:

v  Drilling machines and Milling machines

v  Radial drilling machines [ In Manual Mode ]


 

🎬 Video Highlight Summary:

This video provides detailed instructions for operating a Model TCN tapping attachment, likely from a YouTube video transcript. It outlines the correct procedure for inserting a tap and securing it with the chuck nut. The instructions emphasize mounting the stop arm correctly and adjusting the torque using a cup nut and grub screw. Furthermore, the text offers guidance on identifying when a tap is dull, avoiding tap breakage, and properly engaging the clutch mechanism during operation to prevent damage. Overall, the content serves as a practical guide for using the Model TCN efficiently and safely.

 

🛠️ TCN Reversible Tapping Attachment Technical Data

Model

Taper Shank

Tapping Capacity

L

ØB

ØD

ØC

L1

C1

Expansion

Approx Weight (Kg.)

TCN-1

MT1 / MT2

3 – 10 mm

(1/8” – 3/8")

150 / 155

55

38

69

35

213

12

2.100 Kg. / 2.300 Kg.

TCN-2

MT2 / MT3

6 – 16 mm

(1/4” – 5/8")

170 / 175

68

53

82

40

264

10

3.900 Kg. / 4.000 Kg.

TCN-3

MT3

8 – 18 mm

(5/16” – 3/4")

180

68

55

82

48

264

10

4.400 Kg.

TCN-4

MT3 / MT4

10 – 24 mm

(3/8” – 1")

205 / 210

88

62

105

55

319

15

7.700 Kg. / 8.000 Kg.

TCN-5

MT4

14 – 30 mm

(9/16” – 1-1/8")

240

88

75

105

66

319

15

8.700 Kg.

📝 Important Ordering Note: > TCN model is supplied complete with jaw set no additional spares required. Customers only need to select the appropriate MT shank to match their machine spindle.

Engineered for reliability, speed, and precision in high-performance tapping operations.

🤖 Smart Function:

🧭 Function

📖 Description

🎯 Benefit

📐 Dynamic Alignment Correction

Spindle float allows the tap to align naturally during entry

Ensures accurate, centered threading

🎛️ Smooth Thread Engagement

Reduces lateral forces at the start of tapping

Minimizes deflection and chatter

🔁 Pitch Variation Compensation

Adjusts for discrepancies between spindle feed rate and thread pitch

Prevents mismatch and thread distortion

🛡️ Tap & Thread Protection

Absorbs pressure variations and misalignments

Reduces tap breakage and improves finish

⚙️ Support for Harder Materials

Axial compliance eases stress during tapping in tough materials

Enhances tool life and threading reliability

🧲 Friction-Clutch Torque Control

Uses mechanical friction to regulate torque and disengage under excess load

Prevents tap over-torque and protects against breakage

🔧 Adjustable Torque Setting Mechanism

Operator can tune clutch to specific tap sizes and materials

Maximizes versatility and tap life

🔑 Key Advantages:

v  Universal Machine Fit: Works on all vertical drilling machines and milling machines with rotating spindles whether reversing or non-reversing. As well as Radial drilling machines [ In Manual Mode ].

v  Tap Compatibility: Accepts all standard HSS tap sets and non-standard HSS taps, only the proper tap length is required.

v  Material Suitability: Optimized for ductile metals like MS and CI Casting, and also suitable for Low Carbon Steel.

v  Cost-Efficient Tapping: Enables fast multi-size tapping at low cost with a single attachment.

v  User Requirement: For best performance, operation by a skilled machinist & semi-skilled machinist is recommended.

v  High-Speed Output: Enables tapping faster than TCNR Model and suited for rapid multi-size tapping at low cost.

v  Die Holder Model DH – Versatile Threading Solution: The Die Holder Model DH transforms a standard tapping attachment into a high-efficiency threading tool with a simple die-holder insertion. This smart integration enables dual-purpose functionality tapping and threading without changing machines. It’s a cost-saving, space-efficient choice for any machine shop aiming to boost productivity with minimal setup.

⚡️Quick & Easy Installation – Model TCN:

v  Insert the tap into the attachment's chuck and align it properly.

v  Lightly tighten the square nuts to hold the tap squarely in place.

v  Secure the tap by tightening the chuck nut this grips the tap firmly via the jaws set.

v  Adjust cup nut to control tapping load:

Ø  Turn clockwise to increase load (upgrade torque).

Ø  Turn anticlockwise to decrease load (downgrade torque).

v  Ensure Firm Workpiece Fixation During Tapping: Secure the job rigidly and firmly before tapping to prevent movement, ensure accurate threading, and avoid tool breakage.

v  Blind Hole – Drill Depth Recommendation: The drilled hole should be approximately 2 to 3 mm deeper than the required tapping depth. This extra depth provides clearance for the tap's lead-in point, ensuring accurate threading and preventing bottoming out.

v  Torque Bar TCN (Mandatory For Reversing Mechanism) – Stopper Installation Possibilities: There are two possible methods for setting the stopper

Ø  Upper Side Installation: Mount a vertical rod on the Drill Setting Bar located on the upper side of the machine.

Ø  Bottom Side Installation: Mount a vertical rod in the T-slot at the bottom side of the machine.

v  Tapping Chamfer: A tapping chamfer is necessary to ensure proper thread formation and tool performance during the tapping process. It is the tapered portion at the front of a tap that gradually engages the material, distributing the cutting load across multiple teeth. This taper is essential for reducing stress on the tap, improving alignment, and producing clean, accurate threads.

Ø  The type of hole - Through or Blind - determines the appropriate chamfer style:

Ø  Long chamfers (Type B) are ideal for through holes and offer better surface finish and lower cutting pressure.

Ø  Medium chamfers (Type C) are standard for blind holes.

Ø  Short chamfers (Type E) are used when clearance is limited at the bottom of the hole.

🎯 High-Precision Features:

v  Reversible Operation: Taps right- or left-hand threads without any modification.

v  Tap Safety: Advanced clutch protects taps from breakage with ultra-sensitive overload response.

v  Improved Thread Quality: Axial float and cushioned drive prevent cross-threading and ensure gauge-perfect threads.

v  Rapid Retraction: Planetary reverse mechanism provides 50% faster retraction than the feed rate.

v  Consistent Depth Control: Neutral mechanism ensures precise tapping depth every time.

v  Production-Ready: Capable of handling both batch quantities and mass production with ease.

v  Jaw Set System: Equipped with a precision Jaw Set and adjustable left/right locking nuts, the attachment accommodates all standard tap sizes within its rated capacity. This ensures a secure grip, minimal vibration, and optimal tapping accuracy.

📐 Technical Operating Range:

v  Threading Speed: 150–700 RPM depending on material and tap condition (Always use coolant for finish-grade threads and longer tap life.)

v  Material Hardness: 50–60.5 HRA, 81–97 HRB, 0–20 HRC, [ Rockwell ]

v  Max. Tapping Depth: Up to 3× to 4× the tap diameter. [ Length × Diameter ]

v  L/R Nut Square Sizes: 

Model

L/R Nut Square (mm)

L/R Set, Approx Weight (Kg.)

TCN-1

13.60 [14 mm]

0.030 Kg.

TCN-2/3

17.70 [18 mm]

0.080 Kg.

TCN-4/5

13.60 [24 mm]

0.200 Kg.

v  Mounting Shank Dimensions (MT Shank GP Dia):

Taper

Dia (inch)

Dia (mm)

MT1

0.475”

12.0650

MT2

0.700”

17.7800

MT3

0.938”

23.8252

MT4

1.231”

31.2674

MT5

1.748”

44.3992

🛠️ Maintenance Note:

To extend the life of this tapping attachment or any die head, die holder, or tap chuck avoid constant use at upper or lower limit capacities. Consider rotating between two or three units for heavy-duty applications.

🎯 Torque Setting Guide:   

This guide provides standardized torque values for adaptors with safety clutches, organized by thread type. Use these values as a baseline, adjusting for material strength and thread conditions.

A torque conversion/lookup chart that aligns torque values (Nm) with different thread standards:

Ø  Metric (M)

Ø  BSW (British Standard Whitworth)

Ø  BSP Parallel (British Standard Pipe, parallel)

Ø  BSF (British Standard Fine)

Ø  BSP Taper

Ø  BA (British Association)

Ø  PG (Panzergewinde, German conduit thread)

Ø  NPT Taper (National Pipe Taper)

Ø  UNC (Unified Coarse)

Ø  UNF (Unified Fine)

Usage Notes

Ø  Values include a wear factor of 100% for materials with tensile strength ≤ 1000 N/mm² (145,000 lbs/in²).

Ø  For non‑ferrous materials (e.g., aluminum alloys, brass), torque may be considerably lower.

Ø  For tougher materials (e.g., S. S., Tool Steel ), increase torque by up to 50%.

Ø  For cold‑forming threads, increase torque by 40–100%.

Torque Reference (Ferrous Materials - MS)

Torque (Nm)

Metric (M)

BSW

BSP Parallel

BSF

BSP Taper

BA

PG

NPT Taper

UNC

UNF

0.3

M2



No.9


No.2

0.4

M2.5



No.8


No.3

0.5

M3



No.7



0.6

 

 

 

 

 

No.6

 

 

No.3

No.4

0.8

M3.5



No.5

No.4

No.5

1

 

1/8"

 

 

 

 

 

 

No.5

 

1.2

 

 

 

 

 

No.4

 

 

 

No.6

1.6

M4






No.6

No.8

2

 

5/32"

 

 

 

No.3

 

 

No.8

 

2.5

M5

3/16"

No.2


No.10

3

 

 

 

 

 

 

 

 

 

No.12

4

3/16"

7/32"

No.1

No.10

1/4"

5

M6

7/32"

1/4"

No.0

No.12

6

 

 

G 1/8"

9/32"

 

 

 

 

 

5/16"

8

 

1/4"

 

5/16"

 

 

 

 

1/4"

3/8"

10

M8

 

 

 

 

 

 

 

 

 

12

 

5/16"

 

3/8"

 

 

PG7

 

5/16"

7/16"

16

 

 

 

 

 

 

 

 

 

1/2"

18

M10

3/8"

G 1/4"

7/16"

1/8"


3/8"

20

 

 

 

 

 

 

PG9

1/8"

 

 

22

 

 

 

 

 

 

PG11

 

 

9/16"

25

 

 

 

1/2"

 

 

PG13.5

 

 

5/8"

28

M12

7/16"

G 3/8"


PG16

7/16"

32

 

 

 

9/16"

 

 

 

 

 

 

36

 

 

 

 

 

 

 

 

 

3/4"

40

 

 

 

5/8"

 

 

 

 

1/2"

 

45

M14

1/2"

11/16"

PG21


50

M16

G 1/2"

1/4"


9/16"

56

 

 

G 5/8"

 

 

 

 

1/4"

 

7/8"

63

 

5/8"

 

 

3/8"

 

PG29

 

5/8"

 

70

 

 

G 3/4"

3/4"

 

 

 

3/8"

 

 

80

M18

G 7/8"

13/16"

PG36


90

M20

3/4"

7/8"

PG42

3/4"

1"

100

M22




PG48

1-1/8"

110

 

 

 

 

 

 

 

 

 

1-1/4"

125

 

7/8"

 

1"

 

 

 

 

7/8"

1-3/8"

140

 

 

G 1"

 

 

 

 

 

 

1-1/2"

160

M24

G 1-1/8"

1/2"

1/2"

180

M27

 

G 1-1/4"

1-1/8"

 

 

 

 

 

 

200

 

1"

G 1-3/8"

1-1/4"

3/4"

 

 

3/4"

1"

 

220

 

 

G 1-1/2"

 

 

 

 

 

 

 

240

 

 

G 1-3/4"

 

 

 

 

 

 

 

260

 

 

G 2"

1-3/8"

 

 

 

 

 

 

280

M30

1-1/8"





1-1/8"

300

 

 

G 2-1/4"

1-1/2"

 

 

 

 

 

 

320

M33

1-1/4"

1-5/8"



1-1/4"

340

 

 

G 2-1/2"

 

1"

 

 

1"

 

 

360

 

 

G 2-3/4"

 

 

 

 

 

 

 

400

 

 

G 3"

 

 

 

 

 

 

 

420

M36

G 3-1/4"






450

 

 

G 3-1/2"

1-3/4"

1-1/4"

 

 

1-1/4"

 

 

480

M39

1-3/8"

G 3-3/4"




1-3/8"

500

 

 

 

 

 

 

 

 

 

 

560

 

 

 

 

1-1/2"

 

 

1-1/2"

 

 

630

M42








710

M45

2-1/4"

2"

2"

800

 

1-5/8"

 

2-1/2"

 

 

 

 

 

 

900

M48

1-3/4"

2-3/4"



1-3/4"

1000

M52


2-1/2"




1100

M54

 

 

 

 

 

 

 

 

 

1250

M56

2"





2"

1400

 

 

 

3"

3"

 

 

2-1/2"

 

 

2000

 

2-1/4"

 

 

 

 

 

3"

 

 

2200

 

2-1/2"

 

 

 

 

 

 

 

 


                             
                    

🎯 "Intelligent Quick-Analysis Tool Designed For Discerning Business Customers." 🎯

 

🛠️ TCN Model Reversible Tapping Attachment – Dimensional Range Smart Overview

Model

Taper Shank

Tapping Capacity

TCN - Approx Weight (Kg.)

TCN-1

MT1 / MT2

3 – 10 mm

(1/8” – 3/8")

2.100 Kg. / 2.300 Kg.

TCN-2

MT2 / MT3

6 – 16 mm

(1/4” – 5/8")

3.900 Kg. / 4.000 Kg.

TCN-3

MT3

8 – 18 mm

(5/16” – 3/4")

4.400 Kg.

TCN-4

MT3 / MT4

10 – 24 mm

(3/8” – 1")

7.700 Kg. / 8.000 Kg.

TCN-5

MT4

14 – 30 mm

(9/16” – 1-1/8")

8.700 Kg.

 

🔩 TCN Model Reversible Tapping Attachment – Quick Smart Summary

🔑 Key Features

v  Auto-Reverse Mechanism: Uses planetary gears for rapid and smooth tap retraction.

v  Axial Float: Allows the tap to self-align, improving thread accuracy and reducing breakage.

v  Friction-Clutch Safety System: Prevents tap damage by disengaging under excess torque.

v  Versatile Compatibility: Designed for vertical drilling machines with non-reversing spindles.

⚙️ Operating Highlights

v  Torque Adjustment: Controlled via a cup nut and grub screw for precise clutch calibration.

v  Through & Blind Hole Tapping: Supports both with neutral disengagement and depth control.

v  Lubrication & Maintenance: Requires periodic greasing (~every 600 hours) and cleaning of bearings/gears.

v  Cutting Fluid Use: Emphasizes high-pressure lubrication for heat dissipation and chip clearance.

📌 Safety & Performance Tips

v  Clamp workpieces securely never hold by hand.

v  Use sharp taps and monitor clutch slippage as an indicator of wear.

v  Recommended max operating speed: 700 RPM.

 

🔩 TCN Model Reversible Tapping Attachment – Quick Smart Analysis

Aspect

Details

🔧 Type

Reversible Tapping Attachment TCN – designed for automatic tap reversal

⚙️ Function

Enables internal threading with auto-reverse to prevent tap breakage

🔄 Mechanism

Built-in reversing clutch activates at thread depth for seamless withdrawal

📐 Tap Range

Supports a wide range of metric and imperial tap sizes (e.g., M3–M30)

🛠️ Applications

Ideal for blind and through hole tapping in production environments

✅ Advantages

Boosts productivity – Protects taps – Enhances thread precision

🏭 Use Case

Drilling machines and Milling machines

v  Purpose: Automatically monitors tapping performance and detects anomalies such as torque spikes, misalignment, or dull tap behavior.

v  Functionality:

Ø  Evaluates tap engagement and withdrawal speed.

Ø  Assesses clutch response to prevent tap breakage.

Ø  Flags inconsistent thread profiles or feed mismatches.

v  Benefits:

Ø  Reduces downtime by identifying issues early.

Ø  Improves thread quality and tool life.

Ø  Supports predictive maintenance and operator feedback.

This feature is especially useful in high-volume or precision tapping environments where consistency and tool protection are critical.

 

TOOLS AND APPLIANCES CORPORATION

BLOCK NO.: 135/2, BILESHWARPURA, P.O. CHHATRAL - 382729,

TA. KALOL ( N.G.), DIST. GANDHINAGAR.

MO. 6355213404, 6355251586,

Email :- taco@imitoolsindia.com, salestaco@imitoolsindia.com.




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