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The CRG-780 is a precision rod and cap grinder built by Sunnen, designed for accurate resurfacing of connecting rods, rod caps, bearing surfaces, small journals, and similar machined components. As a used unit, the CRG-780 offers an affordable path to add professional-grade rod/cap grinding capability for rebuild shops, remanufacturers, or automotive-engine shops that want consistent quality without investing in a brand-new grinder.
Ideal for automotive rebuilds, light- to mid-duty diesel engine work, and small-batch production or rebuild jobs, the CRG-780 gives users the ability to resurface rod caps and bearing surfaces to tight tolerances, helping ensure even load distribution and balanced engine assembly. Its design emphasizes precision, reliability, and shop-floor durability.
Hardened Precision Grinding Surface — The CRG-780 uses a hardened, factory-ground surface to ensure accuracy and repeatable results across multiple grinding jobs.
Robust Shop-Duty Construction — Built to withstand regular use in a machine-shop environment, offering longevity and dependable performance when maintained properly.
Versatile Rod & Cap Grinding Capability — Suitable for connecting rods, rod caps, bearing surfaces, small journals — accommodating a wide variety of engine types and rebuild scopes.
Compact & Manageable Footprint — Easier to fit into many shops compared with large-scale industrial grinders — ideal for shops that do rod/cap work but don’t have floor space for heavy equipment.
Cost-Effective Used Equipment Option — Provides quality rod and cap grinding capability at a lower entry cost than new machines — a practical upgrade for shops expanding their rebuild services.
Simple Operation & Maintenance — Straightforward setup and use, minimal complexity compared to multi-axis grinders — suitable for shops looking for reliable, no-frills rod/cap resurfacing.
| Specification | Value |
|---|---|
| Model | Sunnen CRG-780 Rod & Cap Grinder (Used) |
| Grinding Method | Precision cap/rod surface grinding (fixed surface, rotating wheel) |
| Typical Work Types | Connecting rods, rod caps, bearing surfaces, small journals, machine shop parts |
| Construction | Heavy-duty cast/steel housing, precision-ground table, vibration-dampened drive |
| Ideal For | Engine rebuild shops, rod/cap resurfacing, light- to mid-volume production, mixed-use machine shops |
| Advantages | Accuracy, durability, versatility for rods & caps, compact size, cost-effective used solution |
| Limitations | Not intended for oversized crank journals or heavy-duty industrial crankshaft grinding — best for rods/caps and small bearings |
Tell us what you need, and we’ll send you a quick and accurate estimate — no hidden fees, no obligations.
We make equipment decisions easy. Clear answers, accurate recommendations, and support from people who know the industry.
When you reach out, you get answers quickly - not generic replies.
Backed by 50+ years in engine machining and reconditioning.
No surprises, no unclear timelines.
Your machine’s long-term performance is our priority.
Decades before today’s engine shops trusted our equipment, Tony was already deep in the craft — rebuilding motors, machining blocks, and pushing for better precision.
A local newspaper once featured him as a standout young machinist, noting his drive, attention to detail, and obsession with doing things the right way. That same passion would eventually shape our company’s values.
Today, that commitment lives on in every machine we sell, every customer we support, and every shop we help succeed.