Festo DSM-16-270-P-A-B Semi-Rotary Drive

Description

• Model breakdown​ (Festo DSM naming) :
  • DSM​ = Semi-rotary drive (vane-type rotary actuator series)
  • 16​ = Size 16​ (vane diameter/body size — middle of the DSM range: 12/16/25/32/40/63)
  • 270​ = Swivel angle 0°…270°​ (max. rotation range — DSM offers 90/180/270° variants; this is the max-travel 270° version)
  • P​ = Elastic cushioning rings/pads at both ends​ (the “P” damping type — absorbs end-impact; other options: A=no cushioning, P1=adjustable elastic, CC=auto-adjust shock absorber)
  • A​ = Position detection via proximity switch​ (magnetic ring embedded for Hall-effect / reed proximity sensor — sensor sold separately, mounts in grooves)
  • B​ = B-series variant​ (standard shaft = spigot shaft / 圆柱轴 with keyway option; B denotes the B-version mechanical package)
  • → DSM-16-270-P-A-B = Size 16 vane rotary actuator, 270° swivel, double-acting, elastic end cushioning, proximity-switch ready, B-series variant.

💡 What “semi-rotary” means: Unlike a continuous-rotation pneumatic motor, this is a limited-angle actuator​ — it swings between two end stops (0° and 270°), with the exact stroke adjustable via built-in mechanical stops (fine adjustment -6°). Think of it as a “pneumatic wrist” that flips/turns a workpiece.

• P​ (this unit) = Fixed elastic cushioning rings​ at both ends — simple, maintenance-free, absorbs normal inertia loads.
• P1​ = Adjustable elastic cushioning — for varying loads/inertia, you can tune the cushion stroke.
• CC​ = Auto-adjusting hydraulic shock absorber — for very high inertia / high kinetic energy, self-adjusts.

Key Features​ :

• Swivel angle: 0°…270° (adjustable end stops, fine adjustment -6°)
• Mode: Double-acting (air drives both directions — precise bidirectional control)
• Design: Rotary vane (compact, direct conversion of air pressure → rotation)
• Torque @6bar: 2.5 Nm theoretical (actual usable ~2 Nm accounting for friction)
• Cushioning: Elastic rings/pads at both ends (P-type) — absorbs end-of-stroke impact
• Position detection: Via proximity switch (embedded magnet, sensor sold separately)
• Operating pressure: 1.8–10 bar (optimal 6 bar)
• Max swivel frequency: 2 Hz @6bar (120 cycles/min — fast indexing)
• Pneumatic connection: M5 (smallest standard — pairs with push-in fittings M5)
• Mounting: Via female (internal) thread — flange/shaft mount
• Ambient temp: -10°C…+60°C
• Medium: Filtered compressed air per ISO 8573-1:2010 [7:-:-] (lubricated operation possible, then always required)
• CRC 0​ (no corrosion resistance — for dry indoor industrial use; for washdown/chemical, look at HD variant or stainless)
• Cleanroom class 6​ per ISO 14644-1 — suitable for cleanroom applications
• Materials: Housing = wrought aluminium alloy; shaft = steel, nickel-plated; seals = TPE-U (PU) — RoHS compliant
• Weight: 470 g
• Repetition accuracy: ~1° (typical for DSM series — precise enough for most indexing)
• Allowed mass moment of inertia: 0.01 kg·m² (don’t exceed — higher inertia can damage cushioning)
• Max axial force on shaft: 30 N; Max radial force: 75 N (keep side loads minimal — use bearings if needed)

Technical Specifications (DSM-16-270-P-A-B — 547574)

⚠️ Key selection notes:

1. Proximity sensor NOT included​ — The “A” means the body is ready for proximity switches (has grooves + embedded magnet). You must order separately: SME-8M-DS-24V-K-…​ (24V DC NPN/PNP) clips into the groove. Without it, you have no end-position feedback.
2. Shaft type​ — “B” variant = spigot shaft (圆柱轴) with keyway option. If you need a flange shaft​ (large face mount), look at FW​ variant: DSM-16-270-P-FW-A-B (547575). FW has a front face flange for direct mounting of turntables/jigs.
3. Cushioning P-type is FIXED​ — If your application has high inertia (large turntable, heavy gripper), the fixed P cushioning may not absorb the kinetic energy → upgrade to P1​ (adjustable, part no. 566206) or CC​ (shock absorber, part no. 547577).
4. Don’t exceed inertia 0.01 kg·m²​ — Over-inertia can damage the cushioning rings. Calculate: load inertia = m·r² (point mass) or ∑(½·m·r²) for disks. If exceeding, use size 25 (0.015 kg·m²) or 32 (higher).
5. No corrosion resistance (CRC0)​ — For washdown, outdoor, or chemical exposure, this standard DSM is NOT suitable. Consider DSM-HD​ (heavy-duty bearing version) or stainless/coated alternatives.
6. M5 air ports​ — Use M5 push-in fittings (e.g., Festo QS-M5-… series) with 4×6mm or 6×8mm tubing. Flow is modest (470g actuator), so 4×6mm polyurethane tube is fine.

Warranty & After-Sales

• Factory new units: 12 months warranty
• Refurbished units: 3-6 months warranty (bench: apply 6bar compressed air to both ports alternately → smooth 0°↔270° swing, no stall, cushioning engages softly at both ends, proximity sensor groove verified, shaft play <0.1mm)
• Technical support for:
  • Proximity switch selection​ (SME-8M-DS-24V-K-… 24V DC PNP/NPN; clips into DSM groove; 2 sensors needed for both end positions, or 1 for home position — we can supply)
  • Cushioning choice​ (P=fixed elastic (547574, this one) vs P1=adjustable (566206) vs CC=shock absorber (547577) — depends on load inertia. Rule: if load inertia ≤0.01kg·m² → P is fine; if higher → P1/CC)
  • Shaft type choice​ (B=spigot shaft (547574) vs FW=flange shaft (547575) — B for coupling to your own shaft/gear; FW for direct mounting of turntable/jig on front face)
  • DSM-16 vs DSM-25 sizing​ (if 2.5 Nm insufficient → step to DSM-25-270-P-A-B (547578) giving 5 Nm; if 2.5 Nm overkill → step down to DSM-12 (547570) for weight/cost saving)
  • Mounting & tubing​ (female thread mount — use Festo DSM accessory kit for flange clamp; M5 ports → QS-M5 push-in fitting + 4×6mm PU tubing; air prep: FRC filter-regulator-lubricator if lubricated operation chosen)
  • End-stop adjustment​ (-6° fine adjustment screw — sets exact swivel range between 0–270°; for partial stroke (e.g., 0–90° flap), adjust both end stops accordingly)
  • DSM vs DRVS comparison​ (DRVS is Festo’s newer compact rotary actuator with similar function but different body style — DRVS-16-270-P is the DRVS equivalent; DSM is more established, wider accessory ecosystem, better for legacy systems)
  • DSM-HD for higher forces​ (if axial/radial forces exceed 30N/75N → DSM-16-270-P1-HD-A-B (1369117) has heavy-duty bearings: 290N axial, 300N radial — same torque but 700g weight)
• Optional: Proximity switches (SME-8M-DS-24V-K-…), M5 push-in fittings (QS-M5-4-… or QS-M5-6-…), mounting clamps (DSM accessory kit), coupling for spigot shaft, flow restrictor (GRLA-M5 for speed control), silencers (UC-M5), FRL unit (FRC-1/8 for M5 system)

Delivery Time

• Standard delivery: 3-5 working days (stock NOS)
• Express shipping available upon request

Why Choose Our Store

• Genuine Festo DSM-16-270-P-A-B — not gray-market (vane seal tolerance & cushioning ring material & 2.5Nm torque @6bar critical — clones leak air, jitter at end-stops, or fail repetition accuracy)
• Global supply network with competitive pricing on Festo DSM / DRVS rotary actuators (all sizes 12–63, all variants P/P1/CC, A/FW shaft, B-series)
• Expertise in Festo pneumatic rotary system (547574 decode, P vs P1 vs CC cushioning, B vs FW shaft, proximity switch SME-8M selection, M5 air prep, DSM-16 vs 25 vs HD sizing, end-stop adjustment, DSM vs DRVS choice)
• Comprehensive technical documentation (DSM-16-270-P-A-B dimensional drawing, M5 port location, proximity switch groove position, SME-8M install guide, DSM accessory catalog, cushioning selection flowchart)
• Responsive customer service and support

Applications

• Small-Parts Flip / Turn in Assembly: DSM-16-270-P-A-B mounted on a bench — gripper picks a small part, actuator flips it 180° (within 270° range) for inspection or insertion. 2.5 Nm torque handles parts up to ~0.5 kg at 100mm radius. 2 Hz frequency = 120 flips/min — keeps pace with high-speed assembly lines.
• Index Table Drive (light): Direct-mount a small 6-station index dial (≤0.01 kg·m² inertia) on the spigot shaft — actuator rotates 60° increments (within 270° total range) for sequential processing. Proximity switch (SME-8M) at home position for zero-reference.
• Flap / Door / Gate Opening: 270° swing is perfect for flap doors on chutes, inspection hatches, or diverter gates in material handling. Double-acting control gives precise open/close with elastic cushioning (no slam). P-type cushioning sufficient for flaps ≤1 kg.
• Pick-and-Place Wrist: As the “wrist” of a pneumatic pick-and-place — base XYZ handled by linear slides, DSM-16 does the orientation twist (e.g., 90° turn of a bottle for labeling). Compact 470g doesn’t burden the linear axes.
• Conveyor Diverter / Pusher Arm: Swings a diverter arm 270° to route parts to different lanes. Double-acting ensures positive routing in both directions; cushioned ends prevent arm bounce.
• Legacy DSM Maintenance / Spare: Replacing an old DSM-16-270-P-A-B in a 10-year-old machine — this 547574 is the current production part, 100% form-fit-function compatible with earlier DSM-16 units (same M5 ports, same mounting, same shaft). Drop-in spare for minimal downtime.
• Cleanroom / Lab Automation: Cleanroom class 6 (ISO 14644-1) makes this suitable for pharma/electronics lab automation — flippers in sterile environments, sample carousel indexing, etc. Non-lubricated operation possible (dry air per ISO 8573-1 [7:-:-]).