Product Introduction
Excessive vibration and harmonic chatter during cut entry are the primary causes of premature tooth shearing when sawing structural steel, bundled tubes, and non-uniform metal shapes. The Sipu Variable Pitch Metal Blade resolves this structural fatigue through a variable gullet and tooth-spacing configuration. By continuously altering the distance between adjacent tooth tips across each pitch sequence, the blade breaks up vibration frequencies generated by saw machine drive wheels.
Built using high-speed M42 (8% Cobalt) or M51 (10% Cobalt) electron-beam welded tooth tips backed by a flexible YS-2 spring steel carrier, this variable pitch metal blade ensures controlled chip loads during heavy feeding. Whether cutting solid carbon steel rounds, thick-wall seamless pipes, or I-beams, the alternating geometry spreads cutting forces unevenly across the contact zone, keeping section straightness within 0.05mm and prolonging blade service life under high-volume production cycles.
Technical Specifications
| Blade Dimensions (Width x Gauge) | Pitch TPI | Target Material Profiles | Cut Section Thickness Range | Typical Sawing Speed |
| 27 x 0.90 mm (1" x 0.035") | 4/6, 5/8, 8/12 | Medium wall tubing, solid carbon steel bars, channels | 20 mm – 70 mm solid / bundle | 45 – 75 m/min |
| 34 x 1.10 mm (1-1/4" x 0.042") | 2/3, 3/4, 4/6 | Structural steel beams, thick pipes, die steel blocks | 50 mm – 120 mm solid / heavy tube | 35 – 60 m/min |
| 41 x 1.30 mm (1-1/2" x 0.050") | 1.4/2.0, 2/3, 3/4 | Large alloy billets, stainless steel slabs, forged stock | 100 mm – 220 mm solid billet | 25 – 45 m/min |
| 54 x 1.60 mm (2" x 0.063") | 1.0/1.5, 1.4/2.0, 2/3 | Heavy forgings, nickel alloys, thick-wall seamless pipe | 180 mm – 350 mm solid bar | 20 – 35 m/min |
| 67 x 1.60 mm (2-5/8" x 0.063") | 0.75/1.0, 1.0/1.5 | Heavy cast ingots, superalloy blocks, large die steel | > 300 mm solid forged metal | 15 – 30 m/min |
Engineering Features
Dissipating Resonance in Structural Section Cuts
Fixed-pitch bandsaw blades generate repetitive impacts when entering hollow tubing or structural beams, creating acoustic harmonics that micro-fracture tooth edges. Our variable tooth pitch fluctuates gullet capacities and rake angles along the blade body. This mechanical variation prevents the blade from locking into a steady resonance frequency, dampening frame vibration and lowering operating noise on factory floors.
Balanced Chip Load & Gullet Clearance
During deep cuts in solid alloy steels, tight tooth spacing can pack gullets with hot steel curls, causing binding, lateral drift, and crooked cuts. The variable tooth depth design provides deep gullets that clear heavy volume chips during the aggressive phase of the pitch cycle, while shallower gullets maintain beam stiffness to resist twisting under high down-feed pressure.
Maintenance Guide
Speed and Feed Matching: When processing hard alloy steels, lower both linear blade speed and feed force to prevent tooth tip overheating. Excessive feed force on hard stock forces tooth edges to ride over material without penetrating, leading to work hardening and tooth breakage.
Blade Orientation & Guide Clearance: Verify that tooth tips point toward the drive wheel rotation direction (tips facing right or printed branding facing outward). Set backing clearance so the blade back sits 1 mm to 3 mm away from the rear guide wheel flange to avoid back-edge burring.
Tension Adjustment & Wire Brush Placement: Maintain standard tension (typically 250–300 N/mm²) to prevent crooked cuts. Ensure the wire brush contacts the tooth root directly; replace worn brushes immediately to prevent re-circulating metal chips into the cut kerf.
FAQ
Q: What causes center curving or bowed cuts when using a bi-metal variable pitch blade on carbon steel?
A: Bowed cuts usually result from an imbalance between down-feed force and blade linear speed, insufficient blade tension, or worn guide inserts. If feed force is set too high for a given blade speed, the blade body deflects sideways inside the kerf. Adjust feed force down, re-check blade tension to standard specs, and confirm guide bearings are holding the blade square to the table.
Q: How do I determine whether a 2/3 TPI or 3/4 TPI variable pitch blade is correct for my cutting application?
A: Base your selection on the material cross-section engaging the blade at any single moment. A 3/4 TPI configuration works best for solid bars and structural profiles between 40 mm and 90 mm thick. A 2/3 TPI variable pitch blade features larger gullets, making it the proper choice for heavier cross-sections ranging from 80 mm to 150 mm thick, where chip volume per tooth is higher.
Q: Is a dedicated break-in procedure necessary for new variable pitch bandsaw blades?
A: Yes. New blade teeth feature sharp micro-edges that can chip if loaded heavily right away. Run the blade at 50% normal feed speed for the first 50 to 100 cm² of cut cross-section while maintaining normal linear speed. This process gently hones the tooth tips to a fine radius, extending total blade operational life.
Q: What coolant oil concentration should be maintained for cutting stainless steel alloys?
A: For austenitic stainless steels (such as 304 or 316), maintain a water-soluble synthetic or semi-synthetic coolant concentration of 8% to 12%. Proper emulsion strength provides necessary extreme-pressure lubrication at the tooth tip while flushing fine chips out of the variable tooth gullets.
Q: What is your minimum order quantity (MOQ) and standard delivery lead time for wholesale orders?
A: For custom-welded loops, our factory MOQ starts at 50 pieces per specification. For 100-meter coil stock, the standard MOQ is 5 coils. Standard production lead time for full container or bulk air-freight orders ranges between 7 and 14 business days from drawing confirmation.
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