Parallel Shaft Gearmotor on Roller Table Wasting Space? How K Series Right-Angle Solves It

“Our roller tables run 24/7, but the parallel shaft gearmotors stick out sideways, eating up valuable maintenance access space. Is there a way to mount the motor parallel to the table axis without losing efficiency?”

The answer is the K series – a bevel-helical right-angle gearbox. Unlike parallel shaft units (F series) that force the motor to extend laterally, K series allows the motor to sit perpendicular to the roller table, saving up to 50% of side space. It also outperforms cycloidal (lower efficiency) and worm (low efficiency, heat issues) alternatives.

Let’s break down why K series is the proven choice for hot strip mill runout tables, billet transfer lines, and slab roller conveyors.

The Problem: Parallel Shaft Gearmotors Waste Critical Side Space

Parallel shaft gearmotors (F series, R series) keep the motor and output shaft parallel. On a roller table, the motor sticks out perpendicular to the roller axis – often into walkways or water spray zones.

K series solves this with a right-angle output. The motor sits parallel to the roller axis, not sticking out. Side space is dramatically reduced.

The Solution: K Series Bevel-Helical Right-Angle Gearmotor

Hollow shaft key advantage: For new roller table lines or retrofits, specify GKH (hollow shaft with shrink disk). Slide the gearbox directly onto the roller shaft. Eliminate coupling, alignment, and baseplate. Maintenance access becomes even better.

How to Choose – K Series vs Other Options for Roller Tables

✅ Choose K Series when:

● You need to save side space on the roller table – motor must be perpendicular to rollers.

● You want efficiency >95% – better than cycloidal (~90%) or worm (50-89%).

● Service factor requirement is high (fAh = 1.5–2.0 for heavy starts, frequent reversals).

● You prefer hollow shaft mounting (GKH/GKHF) for direct installation onto the roller shaft.

❌ When to choose other series:

Power boundary: When torque exceeds K series range (larger than 55kW or very high torque), consider B series right-angle industrial gearbox. For most individual roller drives (0.75-55kW), K series is the sweet spot.

Key Selection Constraints

⚠️ Axial load limitation – The output shaft of the reducer cannot bear axial load.When using hollow shaft K series (GKH/GKHF), the roller shaft must be supported by its own bearings. Do not allow the roller to push axially against the gearbox.

⚠️ No self-locking – K series has no self-locking. If your roller table is inclined (rare), add a brake motor.

⚠️ Radial load verification – For belt or chain drives, calculate radial load using Fr = 2 × Mr × fr / d. Compare with FRa in selection tables. Direct coupling or hollow shaft mounting has negligible radial load.

⚠️ Service factor selection – For steel mill roller tables with frequent starts/stops and shock loads, use fAh = 1.5–2.0 (group drives use 1.25-1.75). Also multiply by fAc for starts per hour (<100:1.15, <500:1.25).

⚠️ Lubrication – K series requires proper oil level based on mounting position (M1–M6). Confirm orientation when ordering.

Motor & Drive Configuration for Steel Mill Roller Tables

Common Mistakes We Have Seen

❌ Using parallel shaft gearmotors (F/R) on tight roller tables – Wastes side space. Maintenance crew cannot access rollers easily.

❌ Adding coupling and baseplate unnecessarily – For new lines, specify hollow shaft K series (GKH) to slide directly onto roller shaft. Fewer parts, less failure.

❌ Undersizing service factor – Steel mill starts/stops and shock loads require fAh up to 2.0. Standard f=1.0 will cause early failure.

❌ Ignoring axial load limit – Hollow shaft mounting must allow the roller shaft to move axially within its own bearings. Never rigidly lock both ends.

✅ Correct approach – For space-constrained steel mill roller tables, choose K series right-angle gearmotor with hollow shaft (GKH/GKHF) , verify service factor, and follow axial load limitations.

Case Studies

Case 1: Hot Strip Mill Runout Table – Thailand

Customer: A hot strip mill in Rayong, Thailand, with 36 individually driven rollers on the runout table.

Challenge: Original parallel shaft gearmotors stuck out 500mm into the maintenance aisle. Water sprays from cooling pipes soaked the motors. Frequent motor failures.

Solution: Replaced with K series hollow shaft (GKH) units. Each gearbox slid directly onto the roller shaft. No coupling, no baseplate. Motor now sits parallel to roller axis, protected from water.

✅ Result: Side space increased by 400mm. Motor failures reduced by 80%. Energy consumption reduced by 5% due to higher efficiency. The mill is now converting all remaining roller drives to K series.

Case 2: Billet Transfer Table – Indonesia

Customer: A steel plant in Cilegon, Indonesia, with a 50m long billet transfer table using cycloidal gearmotors.

Challenge: Cycloidal units had efficiency ~90% and were bulky. Plant wanted to reduce energy cost and free up space for additional rollers.

Solution: Replaced with K series foot-mounted (GK) units with right-angle output. Used service factor fAh=1.75 for heavy starts.

✅ Result: Energy consumption reduced by 8%. Plant added 6 more rollers in the freed space. Maintenance reports fewer gearbox issues after 14 months.

Case 3: Slab Roller Conveyor – Saudi Arabia

Customer: A steel mill in Jubail with a slab roller conveyor for 10-ton slabs.

Challenge: Existing parallel shaft drives made side access impossible for roller replacement. Also, high ambient temperature (45°C) caused oil overheating.

Solution: Installed K series hollow shaft (GKH) with forced lubrication option (external cooling coil). Verified thermal power with our engineering team.

✅ Result: Roller change time reduced from 4 hours to 90 minutes. No oil temperature issues in two years. Plant standardized K series for all new roller tables.

Technical Support

Installation space assessment – send site photos or layout, we confirm right-angle fit

Service factor verification – send your start frequency and load profile, we calculate fAh and fAc

Hollow shaft mounting drawings, including shrink disk torque specifications

🌏 Why Steel Mills Choose K Series Gearmotor for Roller Tables

🔹 Right-angle space saving – motor sits parallel to roller axis, not sticking out

🔹 Hollow shaft option (GKH/GKHF) – slide directly onto roller shaft, no coupling

🔹 >95% efficiency – lower energy cost vs cycloidal or worm

🔹 High service factor (fAh up to 2.0) – proven for steel mill shock loads

🔹 No brand premium – cost-effective alternative to European right-angle gearboxes

Get a K Series Selection Proposal for Your Steel Mill Roller Table

Send us:

● Roller table type (hot strip, billet transfer, slab conveyor)

● Roller shaft diameter (for hollow shaft)

● Starting frequency (starts/hour) and load profile

● Ambient temperature and desired mounting position

📩 Sales inquiry: shawn.zhu@helmedrive.com

❓ FAQ

Q1: Why choose K series over parallel shaft (F/R) for roller tables?
A: Space. Parallel shaft motors stick out sideways, blocking maintenance aisles. K series right-angle design lets the motor run parallel to the roller axis, saving up to 500mm of side space per drive.

Q2: When should I use the hollow shaft version (GKH/GKHF)?
A: For new roller table lines or full retrofits. Slide the gearbox directly onto the roller shaft. No coupling, no baseplate, no alignment. Saves even more space and reduces maintenance.

Q3: What service factor should I use for steel mill roller tables?
A: fAh = 1.5–2.0 for heavy shock loads with 24h/day operation. For combined drives (multiple rollers from one gearbox), use 1.25-1.75. Multiply by fAc based on starts per hour.

Q4: Can K series handle the high starting torque of a billet transfer table?
A: Yes, when correctly sized with the appropriate service factor. The bevel-helical gear set is designed for high starting torque and shock loads typical of steel mill transfer tables.

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✦ HelmeDrive.com - Professional manufacturer of industrial gearbox in China ✦

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📩 Contact us for a comparison quote:
Email: shawn.zhu@helmedrive.com| WhatsApp:  [+86-13196785788]