Ultimate Chamfer® & Ultimate Spot® – Technical Specifications for Back-Chamfering & Internal Spotfacing

How does the UBackTool works?

  • The UBack tool-holders are designed for CNC automated operations and are compatible with USPOT inserts for back counterboring and spot-facing, as well as UCHAMF inserts for back countersinking.
  • The insert’s opening and closing hydraulic mechanism is activated by directing coolant through the spindle and tool-holder. This system supports coolant, emulsion, or air with a minimum pump pressure of 6 bar (90 PSI).
  • The tool-holder is specifically engineered to prevent scratches while passing through the pilot hole.

UBack Programming guidelines - Continuous Cut

G-CODE EXAMPLE
  • (1) The Folding Length (FL) parameter is listed in the tool-holder tables and is the same for both USPOT inserts and UCHAMF inserts.
  • (2) The illustrated operation sequence above demonstrates working with a USPOT insert but remains the same when using a UCHAMF insert.

UBack Programming guidelines – Interrupted Cut

(1)   The Folding Length (FL) parameter is listed in the tool-holder tables and is the same for both USPOT inserts and UCHAMF inserts.

(2)   The illustrated operation sequence above demonstrates working with a USPOT insert but remains the same when using a UCHAMF insert.

Counterbore Machining Guidelines for Specific Conditions

Counterbore on Cylindrical Bore

  • Use with Internal Coolant

Counterbore on Sloped Surface

  • Use external coolant only

Counterbore on Slot

  • Fully Interrupted Cut
  • Use external coolant only
  • Consider reduced stability and adjust cutting parameters by reducing them by 30%

Counterbore on Shoulder

  • Fully Interrupted Cut
  • Use external coolant only
  • Consider reduced stability and adjust cutting parameters by reducing them by 30%

Counterbore on Shoulder

  • Fully Interrupted Cut
  • Use external coolant only
  • Consider reduced stability and adjust cutting parameters by reducing them by 30%

UBack Tool Insert Replacement

  • UBack inserts can be easily replaced using just a pin and a screw, without the need for any additional mounting devices.
  • The pin is used to secure the insert within the tool-holder, preventing it from retracting while unscrewing.
  • The UBack spare parts, including the screw, key, and pin, are standardized across the entire UBack tool-holder range.

NOTE: The illustrated insert replacement above is demonstrated with a USPOT insert but remains the same when using a UCHAMF insert.

Configuring UBACK tool-holders for different cooling systems

UBACK tool-holders are designed for controlling insert retraction using emulsion, air, or Minimum Quantity Lubrication (MQL) coolant systems. When using air or MQL, seal the tool-holder’s coolant inlet with the supplied plug set screw.

UBack Cutting Recommendations

The table below presents cutting recommendations, outlining initial feed rates and cutting speed for materials group based on ISO 513 and VDI 3323 standards.

 (1) To ensure optimal performance and tool-life under varying conditions:

  • For moderate tool-holder or workpiece stability, consider reducing feed rates by up to 10%.
  • For poor tool-holder or workpiece stability, it’s advisable to decrease feed rates by up to 30%.

Additionally, the operator must ensure the utilization of appropriate coolant media directed to the cutting tip of the blade and right-hand machining (clockwise).

ISO

Material

Condition

As is
AISI / SAE / ASTM

DIN W.-Nr.

vc(1)

cutting speed
m/min.
/sfm

Series B
ƒr(1)
mm/t
/ipt

Series C
ƒr(1)
mm/t
/ipt

Series D
ƒr(1)
mm/t
/ipt

Series E
ƒr(1)
mm/t
/ipt

Series F
ƒr(1)
mm/t
/ipt

Series G
ƒr(1)
mm/t
/ipt

Recommended
Chip-former

Coolant

P

Non-alloy steel
and cast steel,
free cutting steel

<0.25% C

Annealed

1020

1.0044

60-120
/200-390

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.07
/0.0028″

0.08
/0.0031″

0.09
/0.0035″

PL

ML 

Air / Wet

≥0.25% C

Annealed

1035

1.0501

<0.55% C

Quenched and tempered

1045

1.1201

≥0.55% C

Annealed

1055

1.0535

Quenched and tempered

1060

1.1221

Low alloy
and cast steel
(less than 5% of alloying elements)

Annealed

G92600

1.5028

50-120
/165-390

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.07
/0.0028″

0.08
/0.0031″

0.09
/0.0035″

Quenched and tempered

4130

1.7218

4142

1.2332

5045

1.7006

50-100
/165-330

High alloyed steel,
cast steel and tool steel

Annealed

H13

1.2344

40-90
/150-295

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

0.08
/0.0031″

Quenched and tempered

M33

1.3249

Stainless steel and cast
steel

Ferritic/martensitic

420

1.4021

Martensitic

M

Stainless steel

Austenitic, duplex

304L

1.4306

50-100
/165-330

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.07
/0.0028″

0.08
/0.0031″

0.09
/0.0035″

PL 

Wet

K

Gray cast iron (GG)

Ferritic / pearlitic

Class 25

0.6015

60-120
/200-395

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.07
/0.0028″

0.08
/0.0031″

0.09
/0.0035″

PL 

Air / Wet

Pearlitic / martensitic

Grade H20

36037

Nodular cast iron (GGG)

Ferritic

60-40-18

0.7043

50-100
/165-330

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

0.08
/0.0031″

Pearlitic

F33500

0.705

Malleable cast iron

Ferritic

A47

0.8135

Pearlitic

A220 Class

0.8155

N

Aluminum-wrought alloys

Not hardenable

5005

3.3315

100-160
/330-525

0.05
/0.0020″

0.06
/0.0024″

0.08
/0.0031″

0.10
/0.0039″

0.12
/0.0047″

0.14
/0.0055″

PL 

Wet

Hardenable

7075

3.4365

Aluminum-cast alloys

≤12% Si

Not hardenable

518

3.3292

Hardenable

515

3.3241

>12% Si

High temperature

390

 

Copper alloys

>1% Pb

Free cutting

C36000

2.0375

90-130
/295-425

 

Brass

C22000

2.023

Electrolytic copper

C63000

2.0966

Non metallic

Duroplastics, fiber
plastics

Bakelite

 

180-305
/600-1000

Hard rubber

Ebonite

 

S

High temperature alloys

Fe based

Annealed

330

1.4864

40-80
/130-260

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

0.08
/0.0031″

PL

ML 

Wet

Hardened

S590

1.4977

Ni or Co based

Annealed

Incoloy 825

2.4858

25-40
/80-130

Hardened

Inconel 718

2.4668

Cast

Nimocast K24

2.4674

Titanium alloys

Pure

Titanium G.1

3.7024

30-60
/100-180

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

0.08
/0.0031″

Alpha+beta alloys,
hardened

Titanium G.5

3.7165

H

Hardened steel

Hardened

HARDOX 500

 

30-50
/100-165

0.02
/0.0008″

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

ML

HL 

Air

Hardened

HARDOX Extreme

 

30-40
/100-130

Chilled cast iron

Cast

A532 lllA 25% Cr

0.965

45-50
/145-165

0.02
/0.0008″

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

Cast iron

Hardened

A532 IID 20% CrMo

0.9645

30-50
/100-165

0.02
/0.0008″

0.02
/0.0008″

0.03
/0.0012″

0.04
/0.0016″

0.05
/0.0020″

0.06
/0.0024″

(1) To ensure optimal performance and tool-life under varying conditions:

  • For moderate tool-holder or workpiece stability, consider reducing feed rates by up to 10%.
  • For poor tool-holder or workpiece stability, it’s advisable to decrease feed rates by up to 30%.

Available Coating types and surface treatments:​

NOGA’s Code

Coating

Key Features

Applications

Industries

Material Examples

ISO GROUP

P

M

K

N

S

H

NCT

TiAlN

Excellent thermal
stability, oxidation resistance, and wear resistance.

High-speed cutting and
general-purpose machining. Works in wet & dry conditions.

Aerospace, Automotive,

General Engineering

AISI 304, 42CrMo4,
Grey Cast Iron (GG), Ti6Al4V

✓

✓

✓

X

✓

✓

NCD

TiAlSiN

Very high hardness,
extreme oxidation resistance (>1200°C). Excels in dry machining at high
speeds.

Suitable for hardened
steels >45 Rc.

High-performance
machining in demanding environments.

Aerospace, Automotive,

Die & Mold

Inconel 718, AISI
4140, Ti6Al4V, Hastelloy

✓

✓

X

X

✓

✓

NCA

AlTiSiN

High hardness, thermal
stability, and wear resistance.

Works well in dry,
high-speed cutting.

Suitable for hardened
steels >45 Rc.

High-speed machining
in extreme conditions.

Aerospace, Automotive,

Precision Engineering

AISI 316, AISI H13,
Hastelloy

✓

✓

X

X

✓

✓

NCN

AlCrN

High oxidation
resistance (to 1100°C), toughness, abrasion resistance.

General machining in
abrasive/wet conditions.

Automotive, Aerospace,

Die & Mold

AISI 304, AISI 1045,
Grey Cast Iron (GG), AL6061, Die Steels

✓

✓

✓

✓

X

X

NCW

AlTiN

High hardness, wear
resistance, thermal stability up to 1100°C.

Heavy-duty machining
and high-speed cutting.

Dry & abrasive
conditions.

Aerospace, Automotive,

Heavy Engineering

AISI 4340, M2 HSS,
Grey Cast Iron (GG)

✓

✓

✓

X

✓

X

NCB

TiB₂

Excellent thermal
stability, hardness, and very high conductivity.

Prevents material
adhesion and BUE.

High-speed machining
of non-ferrous metals.

Aerospace, Automotive,
Electronics

AL7075, 6061-T6,
Copper, Magnesium Alloys (AZ31), SiC composites

X

X

X

✓

✓

X

POL

Polishing (Surface
Treatment)

Removes scratches,
burrs, and

micro-defects.

Produces smooth finish

and reduces friction.

High-speed finishing
of non-ferrous materials. Improves MRR and surface aesthetics.

Aerospace, Automotive

AL7075, 6061-T6,
Copper, Magnesium Alloys (AZ31)

X

X

X

✓

X

X

Chip-formers:

PL

Positive cutting land

Suitable for all around purpose
and ISO P,M,K,N,S as well as composite materials

ML

Moderate cutting land

Suitable for and ISO P,M,K,S,H
Materials

HL

Negative cutting land

Suitable for and ISO P,M,K,S,H
Materials

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