QuadCut External®
QuadCut is an entirely different type of threading tool. Instead of the traditional horizontal triangular insert, this insert is positioned upright and it has a square shape.
 The insert is much stronger
 The insert mounting is much more stable
 The insert has four cutting edges instead of three
See our PDFdocument for a detailed presentation of this product:

General info

Technical details
Technical details
Cutting data
The table gives recommended cutting speeds in m/min. for different materials and carbide grades.
Material T10 / K20 T10C / K20C T10R / K20R C20 Lowcarbon steel ? 650N/mm2 180220 210250 180400 Carbon steel 650850N/mm2 130190 150210 150350 Alloyed tool steel and heatresistant steel 120160 140180 150350 Stainless steel 7090 90170 110200 150350 Cast iron HB 180250 7090 130170 Nonferrous materials ?400 ?600 Number of passes
The table gives only general recommendations. Many times fewer passes can be used, depending on material and setup.
Pitch mm 0.5 01.15 1.0 01.25 1.5 02.15 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Pitch TPI 48 32 24 20 16 14 12 10 8 7 6 5.5 5 4.5 4 Nr. of passes 46 47 48 59 610 712 712 814 1016 1118 1118 1119 1220 1220 1220 The above recommendations are for full profile UN, ISO and Withworth external forms. For Trapezoidal, ACME, NPT and internal profiles please contact your local QuadCut distributor.
Threading inserts
Toolholders
Cassettes

Helix angles
Helix angles
Helix angles
Over 90% of all common profiles have a helix angle between 0.5° and 2°. We have chosen 1.5° as the standard angle for QuadCut. In the diagram below the helix angle (λ) is shown as a function of the diameter (D2) and the thread pitch (P).
Other helix angles
When threading Trapezoidal and ACME profiles, or when producing a left hand thread with a right hand toolholder, cassettes other than the standard may be required. QuadCut cassettes are available in increments of 1,5° helix. The Internal Standard cassettes have 0.7° helix as standard.
Clearance angles
The side clearance angles on QuadCut are generated by tipping the External insert 10°, and the Internal insert 15° or 20°. Note that the clearance angle is larger for ISO Metric, UN and Whitworth profiles than it is for Trapezoidal and ACME. More care is required when selecting cassettes for Trapezoidal and ACME profiles, to ensure that the helix angle is as close as possible.

Coating
Coating
Inserts are available with three different coatings.
Ccoating
The most universal coating is designated C and is an ordinary TiN coating that performs very well on most materials.
Rcoating
Is TiAlN based and has been specially developed for threading operations. Excellent results have been achieved, particularly in stainless steels and other long chipmaterials. This is usually the universal problem solver.
Lcoating
Shows good results in material such as GX6CrNiMo1810 (CF8M). This coating can work up to 100°C higher temperature than our Rcoating. It is the need to further boost productivity in processing and deploying a wide variety of challenging materials while improving process reliability even under the most difficult circumstances. The high aluminium content enhances oxidation resistance and hot hardness. The balanced coating hardness versus residual stress ratio opens up a broad spectrum of applications. High chemical stability optimizes crater wear resistance. Optimised thermal shock resistance makes Lcoating ideal for wet and dry machining. Greater productivity thanks to higher cutting speeds and feed rates. Reliability and long tool service lives for maximized machine capacity utilization.

How to thread
How to thread
1. Choice of threading method
In this example the machine is rotating in a counter clockwise direction with tools moving from right to left. This method will produce a right hand thread.
2. Choice of carbide grade
The most suitable grade for stainless steel is T10C, because of it ́s resistance to loose edge buildup. As this is an excellent allround grade it will reduce your stock require ments.
3. Choice of insert
Operation 1 See page 14. Choose 12E 2.0ISO T10C Operation 2 See page 17. Choose 12X 14W T10C Operation 3 See page 30. Choose 10N 14W T10R
4. Choice of helix angle
See the diagram on page 8. All threads lie within the field for helix angle 1.5°.
Op. 1 Cassette with helix angle1.5° should be used.
Op. 2 NOTE! Here a lefthand toolholder is used to make a righthand thread. A cassette with negative helix angle must be used, i.e. 98.5.
Op. 3 Toolholder with helix angle 1.5° should be used.
5. Choice of toolholder and cassette
Op. 1 See page 23. The toolblock dimension is 25 mm. Choose cassette type toolholder QER 2525MC25. For cassette see page 24. Holder shank is 25 mm, insert is 12E and helix angle 1.5°. Choose cassette QER 2512.
Op. 2 See page 36. A lefthand blade cassette is chosen with negative helix to make a righthand thread. A block for standard cutoff blade 32mm is available. Use QEL 3206D1298.5
Op. 3 See page 39
A righthand tool holder with a small diameter and helix angle 1.5° is chosen. Use QNR 0010J101.56. Choice of infeed method
See page 9. The material is longchipping, and risk for cold hardening exists, so choice of correct infeed method is important. The machine is equipped with a Gfunction for alternating flank infeed, which should therefore be chosen.
7. Choice of number of passes
See the table on page 10. For the external threads use 7 passes and for the internal 10 passes, since the stability is lower. When programming the thread depth, see the respective page for the thread form being used.
8. Choice of cutting data
The table on page 10 shows that the carbide grade T10C can be run between 90–170 m/min in stainless steel.
\[ V_c = \frac{n \times \pi \times D}{1000} \]
\[ V_c = \text{surface speed in m/min} \]
\[ n = \text{spindle speed in rpm} \]
Op. 1 The lathe specifications show that n_{max} = 2200 rpm with pitch 2.0 and braking distance 2.5 mm.
\[ V_{\text{max}} = \frac{2200 \times \pi \times 42}{1000} = 290 \, \text{m/min} \quad \text{Choose 170 m/min} \]
Op. 2 The lathe specifications show that n_{max} = 950 rpm with pitch 14 TPI and starting distance 4.5 mm.
\[ V_{\text{max}} = \frac{950 \times \pi \times 24.2}{1000} = 72 \, \text{m/min} \quad \text{Choose 70 m/min} \]
The low surface speed can give a problem with looseedge buildup.
Op. 3 There is no problem with start or braking distance, so maximum spindle speed can be utilized. The lathe specifications give n_{max} = 4400 rpm with pitch 14 TPI.
\[ V_{\text{max}} = \frac{4400 \times \pi \times 24.2}{1000} = 335 \, \text{m/min} \quad \text{Choose 180 m/min} \]