PRECISION ROTARY AUTOMATIC (PRA)
Servo-Controlled Precision. Manual Flexibility.
The Precision Rotary Automatic (PRA) is built for operators who need the highest level of downfeed accuracy and consistent flatness across both sides of the part. With a servo motor providing 0.0001″ downfeed resolution and support for A/B side grinding, the PRA is the go-to choice for tight-tolerance environments. All of this is packed into a rugged machine with no pneumatics or hydraulics—just clean, servo-driven performance with minimal maintenance.
✅ Key Benefits
- Servo-controlled downfeed with 0.0001″ precision
- Spindle manually locked in position over the part
- Capable of A/B side grinding for complete surface processing
- 15.75″ diameter rotary magnetic chuck
- Allen-Bradley processor for dependable control
- No pneumatics or hydraulics — clean and simple operation
- Wired for 230V or 460V
- 7.5 HP spindle for demanding jobs
| Feature | Specification |
|---|---|
| Chuck Size | 15.75″ Diameter Rotary Magnetic |
| Downfeed Type | Automatic, 0.0001″ (Servo Motor) |
| Spindle Positioning | Manually Locked Over Part |
| Coolant System | 32-Gallon Tank |
| Spindle Motor | 7.5 HP (Standard) |
| Control | Allen-Bradley Processor |
| Electrical | Wired for 230V or 460V |
| Pneumatics / Hydraulics | None |
| A/B Side Grinding | Yes |
| Machine Type | Precision Rotary Surface Grinder |
Ideal For
- Precision surface grinding with extremely tight tolerances
- Applications requiring dual-sided (A/B) finishing
- Shops seeking servo accuracy without hydraulic complexity
- Clean environments with minimal maintenance needs
Why Choose Swisher Finishing Systems?
Because when precision matters, so does partnership.
At Swisher Finishing Systems, we don’t just build grinders—we build relationships. Every machine we deliver carries 90+ years of proven performance, a hands-on commitment to your success, and the engineering depth of Crankshaft Machine Group behind it.
After installation, our technical team stays with you. Literally. From setup to operator training, we’re by your side—because the best machines are only as good as the people who run them.
With Swisher, you get:
- A collaborative team of engineers and support specialists
- Custom solutions built around your workflow—not the other way around
- Deep application knowledge in grinding, finishing, and automation
- Machines designed to last decades, not product cycles
- Straight answers, quick support, and zero red tape
“If it’s worth grinding, it’s worth grinding with a Swisher.”
That’s not a tagline—it’s a promise backed by every rebuild, every retrofit, every project we stand behind.
Let’s get it right. Together.
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