Baş ve Punta vs. L Tipi vs. U Tipi Robot Konumlandırıcı: İş Parçası Şekline Göre Nasıl Seçilir

İş Parçasıyla Başlayın, Not the Machine

The most common question we receive from factories evaluating Robot Positioners is: “Hangisi daha iyi: kafa ve punta mı yoksa U tipi mi??” Sorunun kendisi yanlış çerçevelenmiş. The right question is: what does my workpiece look like, and which positioner is designed for it?

A head-and-tailstock is the optimal solution for pressure vessel shells — and nearly useless for automotive brackets. A U-type excels on multi-face components in the 300–1,000 kg range — and cannot handle a 3-meter pipe at any payload rating. This article approaches selection the way a buyer actually thinks: starting from the workpiece. For each of six common workpiece categories, we identify the right positioner type, explain why, and back it with documented production outcomes from real installations.

Relationship to the full selection guide: This is the fast-decision companion to the 2026 Robot Konumlandırıcı Satın Alma Kılavuzu: Tüm 5 Types Compared. If you want deeper technical detail on each type, see that article. This one gets you to a recommendation in under 10 dakika.

Quick-Match Table: Find Your Workpiece Category

The large majority of industrial welding workpieces fall into one of six categories. Locate yours below:

Workpiece Description	Typical Examples	First Choice	Second Choice	Eliminate
Uzun, boru şeklinde, axially symmetric — both ends grippable	Basınçlı kaplar, miller, kule bölümleri, boru makaraları	Kafa ve Punta (B Serisi)	H-Tipi (circular section)	U Tipi, Üç Eksenli
Disk, yüzük, or planar geometry — low height-to-diameter ratio	Flanşlar, dairesel çerçeveler, EV battery trays	H-Tipi Dönme Tablası (H Serisi)	Kafa ve Punta (small)	Üç Eksenli
Çok yüzlü, 300–1.000 kg, pure welding	Automotive brackets, instrument frames, equipment mounting plates	U Tipi Çift Eksenli (U Serisi)	L-Tipi	Kafa ve Punta
Çok yüzlü, 300–1.500 kg, kaynak + assembly at same station	EV pil paketi çerçeveleri, motosiklet çerçeveleri, aluminum structures	L Tipi Çift Eksenli (L Serisi)	U Tipi	Kafa ve Punta
Complex multi-face, 500–2.000 kg, heavy weldments	Ekskavatör bomları, vinç kolları, rüzgar türbini motor kaportası çerçeveleri	Üç Eksenli (B008–B012)	Kafa ve Punta (boom body)	H-Tipi, U Tipi
Overweight workpiece, >2,000 kilogram	Heavy pressure vessels, large structural nodes, industrial frames	Heavy Head-and-Tailstock (B004)	Üç Eksenli (B008, kadar 2,000 kilogram)	U Tipi, light H-Type

Senaryo 1: Uzun, Tubular, or Axially Symmetric Workpieces

Tavsiye edilen: Baş ve Punta Robot Konumlandırıcı (B Serisi)

Typical workpieces: Basınçlı kap kabukları (ring and longitudinal seams), büyük tahrik milleri, rüzgar türbini kulesi bölümleri, engineering machinery boom tubes, boru manifoldları Core challenge: Manual repositioning of a 1,500 kg pressure vessel shell requires a crane and two riggers per flip, averaging 20 minutes per event. A typical shell needs 6 ile 8 repositioning events per cycle — over 2 hours of lost arc time per component. Recommended type: Kafa ve Punta Robot Konumlandırıcı — B001 / B002 / B004 Neden: The positioner rotates the workpiece continuously along its primary axis while the robot tracks the seam — a perfect geometric match for circumferential welds. Arc-on time reaches 85%+. Every seam is completed in flat position. Reference models: MRK-B001 (500–1.000 kg, 0.05 mm@R350, 90°/sn, span 2–3.5 m) / MRK-B002 (1,000–1.500 kg, 60°/sn) / MRK-B004 (1,500–5.000 kg, ±0,075 mm@R500, span up to 8 M) Documented result: A Gulf Coast pressure vessel fabricator using MRK-B002: porosity rate on ring seams dropped from 9.2% ile 0.6%; throughput increased from 3 ile 7 components per shift; annual rework cost reduction of $142,000.

When head-and-tailstock does NOT fit

• Workpiece ends cannot be gripped concentrically (irregular cross-section, severe taper)
• Center of mass is significantly offset from the rotation axis — creates dangerous rotational dynamics
• Workpiece outer diameter exceeds the model’s maximum swing diameter

Senaryo 2: Disk, Ring, or Planar Workpieces

Tavsiye edilen: H-Tipi Servo Dönme Tablosu (H Serisi)

Typical workpieces: Flanges of all sizes, dairesel yapısal çerçeveler, EV battery pack base trays, dairesel uç kapakları, halka bölümleri Core challenge: Manually indexing a 600 kg flange between bolt-hole weld positions takes 3 ile 5 minutes per index, introduces angular error, and creates fatigue over a full shift. Recommended type: H-Type Servo Rotation Table — H001 / H004 / H005 Neden: The circular table rotates to each indexed position with servo precision (±0,05 mm) while the workpiece lies flat — matching the natural orientation of disc and planar parts. No lifting or tilting required; lowest integration cost of all five types. Reference models: MRK-H001 (500–2.000 kg, ±0,05@R350, 60°/sn, table dia. 600–2.000 mm) / MRK-H004 (500–1.500 kg, max swing ø2,000 mm) / MRK-H005 (1,500–2.000 kg, max swing ø3,000 mm) Documented result: A flange fabrication shop using MRK-H001: single-shift flange output increased from 24 ile 47 birimler (+96%); first-pass inspection pass rate improved from 71% ile 97%.

When H-type does NOT fit

• Workpiece requires welding on side faces or the underside — H-type rotation only exposes the top surface
• Workpiece height-to-diameter ratio exceeds 0.8 — rotational stability degrades, increasing risk

Senaryo 3: Multi-Face Components, 300–1.000 kg, Pure Welding

Tavsiye edilen: U Tipi Çift Eksenli Robot Konumlandırıcı (U Serisi)

Typical workpieces: Automotive suspension brackets, chassis mounting plates, gösterge paneli çerçeveleri, body-in-white sub-assemblies, equipment housing weldments Core challenge: With a fixed fixture, 40–60% of weld joints on a four-face bracket are executed in vertical or overhead positions. Sonuç: porosity at 8–12%, bead irregularity on vertical seams, and shift-to-shift inconsistency — all caused by position, not programming. Recommended type: U-Type Dual-Axis Robot Positioner — U001 / U002 Neden: The J1 flip axis (±90°) ve J2 dönme ekseni (±200°) bring any face to the upward flat-welding position before each weld sequence. The robot never welds out of position. Footprint of ~1.2 m² allows multiple units side by side in a single cell. Reference models: MRK-U001 (300 kilogram, ±0,05 mm@R250, J1: 30°/sn / 2,695 N·m, J2: 60°/sn / 1,225 N·m) / MRK-U002 (500–1.000 kg, flip ±0.075 mm@R500, tooling ±0.05 mm@R350, J2: 60°/sn) Documented result: A Tier-2 automotive bracket supplier using two MRK-U002 units: overall defect rate dropped from 11.4% ile 1.8%; monthly rework labor cost fell from $28,400 ile $4,100; full investment recovered in 6.1 aylar.

When U-type does NOT fit

• Workpiece weight exceeds 1,000 kilogram (U002 payload ceiling) — step up to L-type or three-axis
• Workpiece length exceeds the U-frame internal clearance — interference with the frame
• A simultaneous assembly operation is required at the same station — U-type has no assembly indexing function

Senaryo 4: Multi-Face Components with Welding + Assembly at the Same Station

Tavsiye edilen: L Tipi Çift Eksenli Robot Konumlandırıcı (L Serisi)

Typical workpieces: EV pil paketi çerçeveleri (aluminum and steel), motorcycle and bicycle main frames, mid-size equipment base structures, any workpiece requiring nut insertion, bearing press-fit, or part assembly at the welding fixture Core challenge: Transferring a 1,200 kg battery pack frame between a welding and an assembly station adds 15 ile 20 minutes of non-value-added time per cycle, requires a crane lift each way, and introduces positional error at every transfer. Recommended type: L Tipi Çift Eksenli Robot Konumlandırıcı — L001 / L002 Neden: The L-frame tooling axis serves dual purpose: rotating the workpiece for multi-face welding access and indexing to precise positions for assembly. Both operations happen at the same fixture, eliminating inter-station transfer. L002 flip torque of 6,720 N·m handles heavily asymmetric 1,500 kg alüminyum çerçeveler. Reference models: MRK-L001 (300–500 kg, tooling axis ±0.05 mm@R350, flip ±0.075 mm@R500, rotation 60°/s) / MRK-L002 (1,500 kilogram, rotation torque 3,960 N·m, flip torque 6,720 N·m, welding ground cable ≥75 mm²) Documented result: An EV battery pack manufacturer using MRK-L002: single-unit cycle time reduced from 42 ile 28 dakika (−33%); two assembly transfer stations eliminated; annual labor cost saving of $186,000.

When L-type does NOT fit

• Pure welding application with no assembly requirement — U-type usually offers better cost efficiency
• Application requires flip angle greater than 90° — L-type flip axis travel is limited

Senaryo 5: Complex Heavy Weldments, 500–2.000 kg

Tavsiye edilen: Üç Eksenli Robot Konumlandırıcı (B008–B012 Serisi)

Typical workpieces: Ekskavatör bom kolları ve kepçeleri, crane jib sections and slewing rings, wind turbine nacelle base frames, madencilik ekipmanı ana yapıları, port machinery rotating assemblies Core challenge: A complex excavator boom has seams across 6+ uçaklar. Traditional workflow requires 4 ile 6 crane repositioning events per cycle, averaging 22 minutes each. Total repositioning time per boom: 90 ile 130 minutes before any additional welding. Recommended type: Three-Axis Robot Positioner — B009 / B011 / B008 Neden: Three coordinated servo axes bring any seam on any face to flat-welding position in sequence. The workpiece is loaded once and unloaded once — all face repositioning is handled by the positioner. B008 swing reaches 5,000 mm; B009 and B011 achieve ±0.03 mm repeatability. Reference models: MRK-B008 (1,500–2.000 kg, rotation ±0.05 mm@R500, swing ø5,000 mm, tooling 60°/s) / MRK-B009 (500–1.000 kg, rotation ±0.03 mm@R500, tooling 90°/s) / MRK-B011 (1,000–1.500 kg, rotation ±0.03 mm@R500, tooling 90°/s) Documented result: A construction machinery factory using MRK-B011 on excavator boom production: crane operations per shift reduced from 68 ile 8 (load-in/out only); single-unit welding cycle shortened from 4.2 ile 2.7 saat (−36%); annual output increased from 580 ile 890 birimler.

When three-axis does NOT fit

• Workpiece exceeds 2,000 kg — switch to heavy-duty head-and-tailstock (B004: 5,000 kg kapasite)
• Workpiece is a standard cylinder or disc — three-axis complexity and cost is not justified; use head-and-tailstock or H-type

Senaryo 6: Overweight Workpieces — Above 2,000 kilogram

Tavsiye edilen: Heavy-Duty Head-and-Tailstock Robot Positioner (MRK-B004)

Typical workpieces: Heavy pressure vessel assemblies (çap 2 m+), large storage tank sections, heavy industrial structural nodes, massive cast-and-weld assemblies Core challenge: At payloads above 2,000 kilogram, most Robot Positioner types are out of specification. The engineering challenge becomes drive torque, braking force, and span rigidity at high rotational inertia — not just nominal load rating. Recommended type: Heavy-Duty Head-and-Tailstock — MRK-B004 Neden: Rated for 1,500 ile 5,000 kg with spans from 3 m to 8 M, designed for high-inertia dynamics of overweight cylindrical workpieces. Controlled deceleration at 20°/s² prevents workpiece shift. The only standard-catalogue model covering loads above 2,000 kg in continuous production. Reference models: MRK-B004 (1,500–5.000 kg, ±0,075 mm@R500, max flip speed 30°/s, accel/decel 20°/s², standart açıklıklar: 3 / 5 / 6 / 8 M) Documented result: A heavy industrial manufacturer using MRK-B004 (8 m span) on 4.2-tonne storage tank sections: crane repositioning events per shift reduced from 12 ile 0 mid-cycle; welding efficiency increased 44%; all crane-related safety incident records eliminated for that workstation.

Baş ve Punta vs. L Tipi vs. U Tipi: Direct Comparison

These three types generate the most selection questions. Five-dimension decision table:

Boyut	Kafa ve Punta (B)	L Tipi Çift Eksenli (L)	U Tipi Çift Eksenli (sen)
Workpiece shape fit	❌ Yalnızca eksenel olarak simetrik	✅ Multi-face, mid-size	✅ Multi-face, small–mid
Maksimum yük	✅ 5,000 kilogram (B004)	⚪ 1,500 kilogram (L002)	❌ 1,000 kilogram (U002)
Baş üstü kaynaklamayı ortadan kaldırır	⚪ Yalnızca çevresel dikişler	✅ Çok yüzlü etkili	✅ All faces — J1+J2
Assembly function at same station	❌ Not supported	✅ Takımlama ekseni çift amaçlı	❌ Not supported
Floor footprint	❌ Büyük (açıklık 2–8 m)	⚪ Orta	✅ En küçük (~1,2 m²)
Entegrasyon karmaşıklığı	✅ Düşük (single axis)	⚪ Orta (two axes)	⚪ Orta (two axes)
Typical purchase cost	⚪ Orta	⚪ Orta	⚪ Orta
Best industry fit	Basınçlı kaplar, wind, boru	EV battery, motorcycle, alüminyum	Automotive brackets, BIW

⚪ = Middle range between the two extremes.

5 Questions to Confirm Your Selection

1. Çeyrek: Can both ends of the workpiece be gripped concentrically? → Yes: head-and-tailstock is a candidate. HAYIR: eliminate head-and-tailstock. 2. Çeyrek: Does the workpiece weight (fikstür dahil) exceed 1,000 kilogram? → Yes: eliminate U-type; evaluate L-type, head-and-tailstock, or three-axis. 3. Çeyrek: Does the workpiece require welding and assembly operations at the same station? → Yes: L-type is the primary candidate. 4. Çeyrek: Are weld seams distributed across 4 or more faces? → Yes: eliminate head-and-tailstock and H-type; evaluate U-type, L tipi, or three-axis. S5: Is annual volume above 500 units with strict weld position consistency requirements? → Yes: coordinated axis control is mandatory, not optional — confirm robot brand compatibility before ordering.

Not Sure Which Category Your Workpiece Falls Into?

Send us a workpiece drawing or photograph with the weight and monthly production volume. Our engineering team will identify the right Robot Positioner type, specify the correct model, and provide a preliminary ROI estimate — in writing, içinde 24 iş saatleri, hiçbir ücret ödemeden.

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Yazar Hakkında

Deneyim & Kimlik bilgileri Robotik kaynak sistemi entegrasyon uzmanı 12+ yıllık doğrudan proje deneyimi. The workpiece-scenario framework in this article is based on selection consulting delivered to 300+ Kuzey Amerika'daki fabrikalar, Avrupa, ve Asya. All case study data reflects documented, anonymized production records from actual installations. Şirket: 26+ yıllarca kaynak otomasyon mühendisliği, 40+ aktif patentler, 1,500+ dünya çapında tamamlanan projeler. All product specifications drawn from current H / B / L / U series datasheets. Sertifikalar： ISO 9001:2015 (GB/T 19001-2016) — Kalite Yönetim Sistemi GJB 9001C-2017 — Askeri/Silah Teçhizat Kalite Yönetim Sistemi BEN NE — Makine Direktifi 2006/42/EC (Sertifika. HAYIR. M.2026.206.C134866) Yüksek Teknoloji Kuruluşu — Sertifika. HAYIR. GR202341000595 (Kasım'da yayınlandı. 2023) Son güncelleme: Mayıs 2026