Anyone can inspect a finished machine and check boxes on a form. Real quality control starts with raw materials and runs through every step of manufacturing. At Starglow Shredder, we have spent 15 years building a quality system that catches problems before they become problems.
This article walks you through our complete production and QC process, step by step. We share this openly because we believe transparency builds trust — and because we are proud of how we build machines.
Every batch of steel that enters our factory is tested before it reaches the production floor.
- Shaft forgings (42CrMo alloy steel): We verify material certificates, check chemical composition with a handheld spectrometer, and test hardness. Forgings that do not meet spec are returned to the supplier. - Blade steel (D2 tool steel): Imported from certified mills. Every batch is spectrometer-tested and sample-hardened to verify it reaches HRC 58-62 after heat treatment. - Frame plate (Q345B structural steel): Thickness, flatness, and surface condition checked on arrival. We reject plates with excessive mill scale, lamination, or out-of-tolerance thickness. - Bearings (SKF/NSK): Only purchased from authorized distributors. Each bearing is visually inspected and verified against the manufacturer's serial number database to prevent counterfeits.
The shaft is the most critical component in any shredder. Our shaft production process:
1. Rough machining on CNC lathes — shaft OD, keyways, and cutter seat profiles 2. Heat treatment — quench and temper to achieve target hardness while maintaining toughness 3. Finish grinding — shaft journals ground to bearing tolerance (typically h6 or h7) 4. Dimensional inspection — every shaft is measured on a coordinate measuring machine (CMM) at 12+ critical points 5. Runout check — maximum allowable runout is 0.02mm. Shafts exceeding this are re-ground or rejected
Cutter seats are machined from the solid forging — we never weld seats onto shafts. Welded seats are a cost-saving shortcut used by some manufacturers, but they create stress concentrations that can crack under impact loads.
Our blades go through a controlled process:
1. CNC plasma or laser cutting of blade blanks from D2 plate 2. Rough machining of mounting holes and edge profiles 3. Heat treatment in our in-house furnace — controlled atmosphere to prevent decarburization 4. Hardness testing — every blade is tested with a Rockwell hardness tester. Target: HRC 58-62. Blades outside this range are scrapped. 5. Finish grinding of cutting edges to specified geometry 6. Final inspection — dimensions, hardness, edge condition, and surface finish
We produce all blades in-house rather than outsourcing. This gives us complete control over steel quality, heat treatment parameters, and edge geometry. It also means we can ship replacement blades fast — they come from the same production line as the originals.
The cutting chamber frame takes enormous forces during operation. Our welding and machining process:
- All structural welds are performed by certified welders using CO2 shielded arc welding - Critical welds (bearing housings, chamber walls) are ultrasonically tested for internal defects - After welding, frames are stress-relieved in an annealing furnace to prevent warping during machining - Bearing housing bores are machined on a CNC boring mill to bearing fit tolerance - Parallelism between shaft center lines is held within 0.05mm across the full cutting chamber width
We invest significant time in frame preparation because a poorly made frame causes bearing misalignment, uneven blade wear, excessive vibration, and premature failure.
Final assembly follows a documented procedure:
1. Shaft and blade assembly — blade spacing, bolt torque, and blade height consistency verified 2. Shaft installation into frame — bearing preload set per specification 3. Drive system installation — motor alignment checked with laser alignment tool 4. Hydraulic system assembly and pressure testing (single-shaft models) 5. Electrical panel installation and PLC programming verification 6. No-load run test — minimum 2 hours. Check vibration levels, bearing temperature, oil pressure, and PLC function 7. Load test — machine runs with actual material (wood, rubber, or plastic depending on model type). Verify throughput, motor current draw, and output quality 8. Final inspection — complete checklist of 60+ items covering every mechanical, electrical, and safety aspect
The machine does not ship until it passes every item on the checklist. We photograph and video-record the load test and share it with the customer before shipping.
Industrial shredders are heavy, expensive machines traveling thousands of kilometers by ocean. Proper packing is essential.
- Machine is drained of all fluids and preserved with anti-corrosion spray - Exposed machined surfaces (shaft ends, blade edges) are coated with rust preventive and wrapped - Machine is bolted to a heavy-duty wooden skid with steel banding - Electrical panel is sealed in waterproof packaging - Spare parts, tools, and documentation are packed in a separate crate - Everything is loaded into a standard 20ft or 40ft shipping container with blocking and bracing to prevent movement during transit
We arrange freight forwarding, customs documentation, and can coordinate delivery to any address in Canada or the United States. Customers receive container tracking information and estimated arrival dates.
Every customer is invited to inspect their machine before it ships. For international customers who cannot visit the factory in person, we offer a comprehensive video inspection:
- Live video call walking through the complete machine - Close-up inspection of welds, machining surfaces, blade condition, and electrical panel - Demonstration of the load test with actual material - Review of packing and container loading
This is not a marketing video — it is a real inspection. Customers can request specific measurements, additional tests, or modifications during the video call. The machine ships only after the customer approves.
Contact sales@starglow-shredder.com to learn more about our machines and quality process.