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250mm PVA Grinding & Polishing Wheel (PVA-1200)
| Parameter | Value |
|---|---|
| Outer Diameter (OD) | 250 mm |
| Working Layer Material | PVA (Polyvinyl Alcohol) bonded abrasive |
| Grit Size | 1200# (fine) |
| Backing / Base Material | Aluminum (aluminum substrate) |
| Bore Diameter (Hole) | 32 mm |
| Target Material | Brass, copper, non-ferrous metals |
This 250mm PVA grinding wheel is specifically designed for fine polishing and surface finishing of brass materials.
The wheel combines a 1200# PVA working layer bonded to a durable aluminum base with a standard 32mm bore.
PVA (Polyvinyl Alcohol) Grinding Wheels are different from conventional resin or Vitrified Wheels. The PVA bond is soft, elastic, and porous.
Key characteristics of PVA wheels:
✅ Soft cutting action – prevents scratching soft metals
✅ Porous structure – excellent chip evacuation
✅ Heat sensitive – self-dressing action prevents burning
✅ Produces smooth, satin-like finishes
Brass is a soft, non-ferrous metal that poses unique challenges:
| Challenge | Why PVA Wheel Solves It |
|---|---|
| Scratches easily | Soft PVA bond reduces surface scratching |
| Heat sensitivity | Porous structure dissipates heat; self-dressing prevents burning |
| Smearing / galling | Open porosity prevents metal loading on wheel |
| Requires fine finish | 1200# grit produces smooth, uniform surface |
Standard aluminum oxide or silicon carbide wheels are often too aggressive for brass finishing. PVA wheels provide the gentle, controlled cutting action needed for high-quality brass surfaces.
✅ 1200# Fine Grit – produces smooth, polished finish on brass
✅ PVA Working Layer – elastic, self-dressing, non-loading
✅ Aluminum Backing – lightweight, corrosion resistant, flat and true
✅ 32mm Bore – fits standard polishing/spindle machines
✅ 250mm Diameter – suitable for medium to large brass workpieces
Polishing brass plates and sheets
Surface finishing of brass fittings and hardware
Deburring and edge rounding on brass components
Removing light oxidation or tarnish
Final satin finishing before lacquering or plating
Brass musical instrument parts
Decorative brass products
| Parameter | Recommendation |
|---|---|
| Wheel speed | 15 – 25 m/s (slower than conventional wheels) |
| Coolant | Water or light water-soluble oil (recommended) |
| Feed pressure | Light – moderate (heavy pressure causes glazing) |
| Machine | Surface grinder, polisher, or dedicated brass finishing machine |
⚠️ Important: PVA wheels are heat sensitive. Do not exceed recommended speeds. Use coolant for extended runs to prevent surface glazing.
| Feature | Conventional Wheel | PVA Wheel (This Product) |
|---|---|---|
| Cutting action | Hard, aggressive | Soft, gentle |
| Heat generation | High | Low (porous structure) |
| Loading on soft metals | Common | Rare (self-cleaning) |
| Surface finish on brass | May scratch | Smooth, satin finish |
| Dressing requirement | Frequent | Self-dressing (minimal) |
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