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GRINDING FIXTURE
Grinding Fixture For Circular Chaser Grinding of Revolving / Stationary Self Opening Die Heads DR & DRF / Revolving Die Heads DRSA [ CNC ] & DRFSA [ CNC ]
Circular Chaser : Grinding Fixture
📌 Purpose:
A Grinding Fixture is a
specialized tool used in grinding to hold, locate, and support a circular chaser
during grinding operations. It ensures precision, repeatability, and safety
while achieving the desired surface finish or geometry.
What Is a Grinding Fixture?
A grinding fixture is a
type of holding device designed to:
v Secure
the circular chaser firmly during grinding
v Maintain
consistent alignment with the grinding wheel
v Allow
repeatable setups for batch production
v Support
complex geometries or delicate parts
Key Components
|
Element |
Function |
|
Base
Plate |
Provides
stability and mounts to the grinding machine |
|
Locating
Pins |
Precisely position
the circular chaser relative to the grinding tool |
|
Clamping
Mechanism |
Holds
the circular chaser securely during operation |
|
Adjustable
Head |
Allows angle
adjustments for hook, face, and clearance grinding |
|
Adapters |
Fit
specific chaser sizes and maintain correct orientation |
Applications
v Circular chaser grinding useful for Mass production of identical parts
Fixture Features Supporting
Compatibility
v Adjustable
angle settings for hook, face, and clearance angles
v Interchangeable
adapters for matching chaser block sizes
v Stable base and head clamps to ensure precise grinding angles for all supported sets
🏗️ Machine Compatibility:
Model Grinding Fixture For
Circular Chaser Set can be seamlessly mounted on:
v DR
v DRF
v DRSA
v DRFSA
🛠️ Grinding Fixture Technical Data
|
Die Head Model |
Gauge |
Micrometer [AA-93960 & A-93958] |
Grinding Adaptor |
Pull Back Wrench |
|
DR |
|
|
|
|
|
DR
5/16” |
M1 [1M] |
"AA"
[9866] & "A" [9865] |
A1 [1A] |
P1 (Brass) |
|
DR
3/8” |
M2
[2M] |
"AA"
[9866] & "A" [9865] |
A2
[2A] |
P2
(Brass) |
|
DR
9/16” |
M3 [3M/M5] |
"AA"
[9866] & "A" [9865] |
A3 [3A/A5] |
P3 (Brass) |
|
DR
13/16” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DR
1” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DR
1-1/16” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DR
1-5/8” |
M5 [5M] |
"AA"
[9866] & "A" [9865] |
A5 [5A] |
P5 (Brass) |
|
DR
2” |
M5
[5M] |
"AA"
[9866] & "A" [9865] |
A5
[5A] |
P5
(Brass) |
|
DRF |
|
|
|
|
|
DRF
13/16” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DRF
1” |
M3 [3M/M5] |
"AA"
[9866] & "A" [9865] |
A3 [3A/A5] |
P3 (Brass) |
|
DRF
1-5/8” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DRF
2-3/8” |
M5 [5M] |
"AA"
[9866] & "A" [9865] |
A5 [5A] |
P5 (Brass) |
|
DRSA |
|
|
|
|
|
DRSA
3/8” |
M2 [2M] |
"AA"
[9866] & "A" [9865] |
A2 [2A] |
P2 (Brass) |
|
DRSA
9/16” |
M3
[3M/M5] |
"AA"
[9866] & "A" [9865] |
A3
[3A/A5] |
P3
(Brass) |
|
DRSA
13/16” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRSA
1” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DRSA
1-1/16” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRSA
1-5/8” |
M5
[5M] |
"AA"
[9866] & "A" [9865] |
A5
[5A] |
P5
(Brass) |
|
DRSA
2” |
M5 [5M] |
"AA"
[9866] & "A" [9865] |
A5 [5A] |
P5 (Brass) |
|
DRFSA |
|
|
|
|
|
DRFSA
13/16” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRFSA
1” |
M3
[3M/M5] |
"AA"
[9866] & "A" [9865] |
A3
[3A/A5] |
P3
(Brass) |
|
DRFSA
1-5/8” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRFSA
2-3/8” |
M5
[5M] |
"AA"
[9866] & "A" [9865] |
A5
[5A] |
P5
(Brass) |
📝
Important Ordering Note:
When placing an order for a Grinding
Fixture (F1), it is essential to specify the corresponding Die Head
Model to ensure correct compatibility and processing.
📌 Example: For Die Head Model DR 9/16”, the order should be written as: Grinding Fixture F1 DR 9/16”
Engineered for reliability, speed, and precision in high-performance threading operations.
🤖 Smart Function:
|
🧭 Function |
📖 Description |
🎯 Benefit |
|
🛡️ Secure Clamping Mechanism |
Holds
circular chasers firmly with stable base and head clamps |
Prevents
vibration, ensures safety, and maintains precision during grinding |
|
🎯 Micrometric Angle Adjustment |
Adjustable head
and base scales for hook, face, and clearance angles |
Enables precise
geometry control and repeatable grinding results |
|
🔄 Interchangeable Adapters |
Adapters
fit specific chaser sizes and maintain correct orientation |
Provides
compatibility across DR, DRF, DRSA, DRFSA die-head models |
|
🧰 Universal Fixture Fit |
Mounts easily on
standard grinding machines |
Maximizes
flexibility for different shop setups |
|
⏱️ Quick Setup & Changeover |
Step-by-step
fixture design with preset 12° chip clearance angle |
Reduces
downtime and speeds up batch production |
|
🧲 Stable Locating Pins |
Precisely position
chasers relative to grinding wheel |
Ensures consistent
alignment and uniform grinding quality |
|
⚙️ Versatile Angle Control |
Swivel
and rotate fixture for multi-angle grinding |
Supports
complex geometries and special thread profiles |
|
📐 Precision Repeatability |
Maintains tight
tolerances critical for thread cutting and resharpening |
Improves thread
accuracy and reduces trial-and-error adjustments |
|
🛠️ Easy Installation |
Simple
clamping and adapter positioning system |
Boosts
operator productivity and reduces training effort |
|
🧪 Extended Tool Life |
Proper
resharpening prolongs chaser and die-head lifespan |
Minimizes wear,
reduces replacement costs, and enhances performance |
🔑 Key Advantages:
🎯 Precision &
Repeatability
v Consistent
alignment of the workpiece ensures uniform grinding results.
v Maintains
tight tolerances, critical for thread cutting and tool resharpening.
🧱 Stability & Safety
v Secure
clamping prevents vibration or movement during grinding.
v Reduces
risk of operator error and enhances workplace safety.
⏱️ Time Efficiency
v Speeds
up setup and changeover between parts.
v Ideal
for batch production or repetitive grinding tasks.
📐 Versatile Angle Control
v Allows
precise adjustment of hook, face, and clearance angles.
v Supports
complex geometries and multi-angle grinding operations.
🔄 Adaptability
v Compatible
with multiple chaser sets (DR, DRF, DRSA, DRFSA).
v Interchangeable
adapters make it suitable for various die head models.
🧼 Improved Surface Finish
v Enables
smoother finishes due to controlled grinding angles.
v Reduces
post-processing or manual touch-ups.
🔧 Tool Life Extension
v Ensures
proper resharpening, which prolongs chaser and tool life.
v Minimizes wear and tear from improper grinding setups.
⚡️Quick & Easy Installation – Grinding Fixture Setting :
⚙️ Grinding Fixture Setup Guide
for Chaser Blocks
v v Step-by-Step Procedure
- Chaser
Preparation
Ø
Move each chaser forward and lock them in place
on their blocks.
Ø
Insert the block and chaser into the correct-size
adapter.
- Adapter
Positioning
Ø
Secure the adapter using the center screw
in the slot of the Grinding Fixture.
Ø
All adapters are preset to hold the chaser at a 12°
angle for the chip clearance grind.
- Hook
Angle Adjustment
Ø
Rotate the grinding fixture head to the desired
angle using the degree scale on the bracket.
Ø
Lock in place by tightening the fixture head
clamp screw.
- Face
Angle Setting
Ø
Swivel the entire fixture on its base.
Ø
Tighten the base lock screw after setting
the face angle.
💡 To achieve a standard face
angle of 1° 30′:
Ø
Use fixture’s base scale to align properly.
Ø
If hook angle is increased by 5°,
increase base setting by 1° to maintain proper geometry.
🧰 Pro Tips for Precision
v Always
verify the angle settings before grinding.
v Use
calibrated micrometres for chaser inspection post-grind.
v Clean fixture and components thoroughly before each use.
🛠️ Die Head Maintenance & Chaser
Grinding Guideline
👥 Target Audience
v Machine
Operators
v Maintenance
Technicians
v Set-Up
Personnel
v Tool
Grinders
v Process
Engineers
🔧 Key Topics Covered
v Preventive
Maintenance
Ø
Identifying wear in die head components
Ø
Understanding how wear affects piece part
quality
v Set-Up
& Adjustments
Ø
Presetting tooling correctly
Ø
Mounting chasers into die head
Ø
Setting and verifying pitch diameters
v Grinding
& Resharpening Procedures
Ø
Achieving repeatable grinds for straight and
tapered threads
Ø
Micrometer calibration and qualification
⏱️ Process Duration
Estimated time: 1–2 hours Recommended tools: Overhead
projector & sketch board for visual aids
✅ Key Highlights for Die Head
Maintenance
|
Component |
Inspection Criteria |
|
Chaser Springs |
Ensure free movement,
no chips obstructing, and not bent |
|
Pins in Block |
Check for any breaks or bends |
|
Diehead Cup Cams |
Inspect edge for signs
of excessive wear |
|
Guide Pins |
Verify stability; replace if
movable |
|
Adjusting Plate |
Inspect for warping
especially if guide pin was replaced |
|
Floating Bushing |
Confirm visible bushing through
body hole |
|
Plunger |
Remove and inspect
control point at tip edge |
|
Spring Plunger |
Confirm spring maintains
adequate compression during replacement |
🔧 Advantages of Circular Chasers
🌀 Optimized Shape for
Performance
v The
circular design ensures minimal rubbing just behind the cutting edge,
promoting better lead control.
v Reduces
friction and wear, resulting in smoother threads and extended chaser
life.
v The
chaser’s solid body and external mounting allow for rapid heat
dissipation and efficient chip removal ideal for higher cutting speeds.
🎯 Consistent Accuracy
v Delivers
precision threads immediately, eliminating the need for trial-and-error
adjustments.
v Features
annular thread forms with a factory-set helix angle that remains
consistent throughout the tool’s life.
🔄 Superior Regrinding
Capability
v Can
be re-ground through a full 270°, far surpassing the lifespan of
thin-blade alternatives.
v The
built-in throat grind maintains its geometry even after multiple
re-sharpenings.
v Simplified
grinding process ensures accurate, repeatable results with minimal
effort.
⚙️ Quick and Easy Replacement
v Chasers
are pre-mounted and precisely ground, enabling fast installation
without disturbing the setup.
v Replacement
takes seconds, thanks to user-friendly mechanisms like a screw turn or
reset handle much faster than traditional systems.
🔁 Full Interchangeability
v Circular
tools are interchangeable between rotating and non-rotating heads, size
for size.
v By
adjusting the grind, the same chaser can be optimized for a wide range of
materials, enhancing versatility.
🧩 Exclusive Modular
Shanks
v Unique
to our circular chaser systems, modular shanks allow the same head to be
used across multiple machines.
v Reduces
tooling inventory, improves utilization, and minimizes downtime.
v Available
in standard and coolant-induced versions across various sizes (see pages
11).
🔩 4-Chaser Dieheads
v Offer
high production efficiency, accuracy, and cost-effectiveness.
v Their
size range and interchangeability make them one of the most versatile
threading tools available.
v Modular
shank design allows for easy adaptation to different machines and
reduces replacement costs.
🛠️ 5-Chaser Dieheads
v Designed
for demanding applications requiring tighter tolerances and better
gauging (e.g., tri-roll).
v The
rigid 5-point contact ensures superior performance on parts with flats,
keyways, slots, or holes.
v Enhances
roundness and thread quality, justifying the slightly higher cost with
significant performance gains.
v Modular
shank compatibility ensures flexibility and cost savings across
machines.
🧱 Replaceable Plunger
Wear Insert
v All
dieheads include a hardened, replaceable plunger wear insert.
v Unlike
older designs with built-in grooves, this insert can be replaced affordably,
extending the life of the diebody.
v Prevents
costly diebody replacements and ensures long-term durability.
🔩 Chaser Thread Standards
|
Thread |
Full Form |
Description |
|
NPT |
National Pipe Taper |
Tapered thread used in
U.S. pipe fittings. Creates a seal via thread interference. |
|
BSP |
British Standard Pipe |
Common in Europe and Asia.
Includes BSPT (tapered) and BSPP (parallel) threads. |
|
BSW |
British Standard
Whitworth |
Coarse thread with
rounded crests and roots. Used in older British machinery. |
|
UNF |
Unified National Fine |
Fine-pitch thread used in
precision applications. Part of the Unified Thread Standard. |
|
UNC |
Unified National
Coarse |
Coarse-pitch thread
for general fastening. Also part of the Unified Thread Standard. |
|
Metric |
ISO Metric Thread |
International standard. Uses
millimeter-based pitch and diameter. |
🧰 Where They're Commonly Used
v NPT:
Plumbing, gas lines, hydraulic systems (mostly in North America)
v BSP:
Water and fluid systems (Europe, Asia, Australia)
v BSW:
Restoration, vintage British equipment
v UNF/UNC:
Automotive, aerospace, general engineering (U.S. and Canada)
v Metric: Global standard for bolts, screws, and fasteners
🛠️ Maintenance Note:
To ensure consistent threading accuracy and extended tool
life, DR/DRF/DRSA/DRFSA Circular Diehead Chasers should be:
v 🔧 Kept Clean & Sharp:
Regularly inspect and clean chasers to prevent chip buildup and dull edges.
v 💧 Use Proper Coolant:
Always apply cutting fluid during operation to reduce wear and improve finish.
v 📐 Check Seating & Alignment:
Ensure chasers are correctly seated in the die head for uniform thread cutting.
v 🔄 Rotate Usage: Alternate
between sets in heavy-duty production to avoid premature wear.
v 🛡️ Trial Verification: Perform a trial cut after installation to confirm thread size and accuracy.
🎯
"Intelligent
Quick-Analysis Tool Designed For Discerning Business Customers."
🎯
🛠️ Grinding Fixture –
Dimensional Range Smart Overview
|
Die Head Model |
Gauge |
Micrometer [AA-93960 & A-93958] |
Grinding Adaptor |
Pull Back Wrench |
|
DR |
|
|
|
|
|
DR
5/16” |
M1 [1M] |
"AA"
[9866] & "A" [9865] |
A1 [1A] |
P1 (Brass) |
|
DR
3/8” |
M2
[2M] |
"AA"
[9866] & "A" [9865] |
A2
[2A] |
P2
(Brass) |
|
DR
9/16” |
M3 [3M/M5] |
"AA"
[9866] & "A" [9865] |
A3 [3A/A5] |
P3 (Brass) |
|
DR
13/16” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DR
1” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DR
1-1/16” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DR
1-5/8” |
M5 [5M] |
"AA"
[9866] & "A" [9865] |
A5 [5A] |
P5 (Brass) |
|
DR
2” |
M5
[5M] |
"AA"
[9866] & "A" [9865] |
A5
[5A] |
P5
(Brass) |
|
DRF |
|
|
|
|
|
DRF
13/16” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DRF
1” |
M3 [3M/M5] |
"AA"
[9866] & "A" [9865] |
A3 [3A/A5] |
P3 (Brass) |
|
DRF
1-5/8” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DRF
2-3/8” |
M5 [5M] |
"AA"
[9866] & "A" [9865] |
A5 [5A] |
P5 (Brass) |
|
DRSA |
|
|
|
|
|
DRSA
3/8” |
M2 [2M] |
"AA"
[9866] & "A" [9865] |
A2 [2A] |
P2 (Brass) |
|
DRSA
9/16” |
M3
[3M/M5] |
"AA"
[9866] & "A" [9865] |
A3
[3A/A5] |
P3
(Brass) |
|
DRSA
13/16” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRSA
1” |
M4
[4M] |
"AA"
[9866] & "A" [9865] |
A4
[4A] |
P4
(Brass) |
|
DRSA
1-1/16” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRSA
1-5/8” |
M5
[5M] |
"AA"
[9866] & "A" [9865] |
A5
[5A] |
P5
(Brass) |
|
DRSA
2” |
M5 [5M] |
"AA"
[9866] & "A" [9865] |
A5 [5A] |
P5 (Brass) |
|
DRFSA |
|
|
|
|
|
DRFSA
13/16” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRFSA
1” |
M3
[3M/M5] |
"AA"
[9866] & "A" [9865] |
A3
[3A/A5] |
P3
(Brass) |
|
DRFSA
1-5/8” |
M4 [4M] |
"AA"
[9866] & "A" [9865] |
A4 [4A] |
P4 (Brass) |
|
DRFSA
2-3/8” |
M5
[5M] |
"AA"
[9866] & "A" [9865] |
A5
[5A] |
P5
(Brass) |
🔩 Grinding Fixture –
Quick Smart Summary
The Grinding Fixture is a
precision tool designed to hold and align circular chasers during resharpening.
It ensures repeatability, stability, and accuracy across DR, DRF, DRSA,
and DRFSA die-head models, making it indispensable for maintaining threading
quality and extending tool life in high-volume production environments.
🔑 Key Features
v 🛡️
Secure Clamping Mechanism: Firmly holds circular chasers with base plate
and head clamps—prevents vibration and ensures safety.
v 🎯
Micrometric Angle Control: Adjustable head and base scales allow precise
hook, face, and clearance angle settings.
v 🔄
Interchangeable Adapters: Fits specific chaser sizes and maintains
correct orientation across DR, DRF, DRSA, DRFSA models.
v 🧰
Universal Machine Fit: Mounts easily on standard grinding machines for
flexible shop integration.
v ⏱️
Preset Chip Clearance: Adapters preset at 12° clearance angle for
consistent geometry and efficient chip removal.
v 📐
Precision Repeatability: Maintains tight tolerances critical for thread
accuracy and resharpening consistency.
v 🧲
Stable Locating Pins: Precisely position chasers relative to grinding
wheel for uniform results.
v 🛠️
Quick Setup & Changeover: Step-by-step fixture design reduces
downtime and speeds up batch production.
v 🧪
Extended Tool Life: Proper resharpening prolongs chaser and die-head
lifespan, minimizing replacement costs.
⚙️ Operating Highlights
v Angle
Adjustments: Hook angle via fixture head rotation; face angle via base
swivel with scale alignment.
v Standard
Geometry: Face angle of 1°30′ maintained; adjustments compensate
automatically when hook angle changes.
v Setup
Guide: Chasers locked in blocks → inserted into adapters → secured with
center screw → aligned for grinding.
v Compatibility:
Supports DR, DRF, DRSA, DRFSA chaser sets with modular adapters.
📌 Safety &
Performance Tips
v Verify
angle settings before grinding to avoid geometry errors.
v Use
calibrated micrometers for post-grind inspection.
v Clean
fixture and components thoroughly before each use.
v Always
perform trial checks to confirm accuracy before batch runs.
Bottom Line: The Grinding
Fixture ensures precision resharpening, repeatable setups, and extended tool
life. By combining secure clamping, micrometric angle adjustments, and
universal compatibility, it is a critical support tool for maintaining die-head
threading performance in demanding production environments.
🔩 Grinding Fixture –
Quick Smart Analysis
|
v Overview: The Grinding Fixture is engineered for precision resharpening of circular chasers used in DR, DRF, DRSA, and DRFSA self-opening die heads. It ensures accurate geometry restoration of hook, face, and clearance angles, enabling consistent threading performance and extended tool life. Key features include:
Ø Secure
clamping system for vibration-free grinding
Ø Micrometric
angle adjustment with calibrated scales for hook and face angles
Ø Interchangeable
adapters preset at 12° clearance angle for repeatable geometry
Ø Precision-ground
locating pins for consistent chaser alignment
Ø Universal
compatibility with standard grinding machines
v
Ø Real-time
verification of angle settings and chaser positioning
Ø Detection
of misalignment, uneven wear, or incorrect clearance angles
Ø Evaluation
of grinding accuracy against preset geometry standards
Ø Alerts
for inconsistencies in chaser profile or dimensional tolerances
v
Ø Extends
chaser and die-head lifespan through accurate resharpening
Ø Improves
thread quality by maintaining correct cutting geometry
Ø Reduces
downtime with quick setup and repeatable adjustments
Ø Supports
predictive maintenance and operator feedback loops
v
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.
