PFERD Flap Wheels - Unmounted Type - Aluminium Oxide

Flap Wheels - Unmounted Type - Aluminium Oxide

PFERD provides unmounted flap wheels with various
- grit sizes,
- dimensions.

The coated abrasive flaps are arranged radially around the tool axis in a fan-type configuration. Due to their flexibility, they adapt ideally to the contours of the workpiece. The abrasive grit is embedded in a resinoid bond on the strong, flexible backing cloth. Unmounted flap wheels are designated "Flap
Wheels" according to ISO 5429.

Application examples:
- Fine grinding work on large radii in container, kitchen and apparatus construction
- Removal of coarse uneven spots, e.g. weld dressing
- Achievement of homogeneous finishes (grinding patterns) on larger surfaces and contours in manual applications
- Very fine grinding as a precursor to highgloss polishing
- Also suitable for robotic and stationary use

Recommendations for use:
- Unmounted flap wheels achieve their best performance at a recommended cutting speed of 15Ð30 m/s. This provides an ideal compromise between stock removal, surface quality, thermal load on the workpiece and tool wear.
- Flexible shafts, straight grinders and grinding blocks can be used as tool drives
- The drive power output required for tool drives is 1,000Ð1,500 watts
- Use grinding oil that is suitable for the material in order to significantly increase the tool life and the abrasive performance of the tools.

Advantages:
- High flexibility
- High stock removal due to the aggressive coated abrasive
- Carrier material wears off uniformly and without residue on the workpiece surface, meaning that sharp abrasive grain is exposed at all times
- Due to the special mounting system, the face of the unmounted flap wheels can be used to work very close to edges and in corners

Factors influencing the work result:
- Tool wear and thermal load: The reduction of the contact pressure and the peripheral speed, together with the addition of grinding oil, reduce tool wear and the thermal load on the workpiece.
- Stock removal: An increase in stock removal should be attained by using a coarser grit size rather
than by increasing the contact pressure in order to prevent unnecessary tool wear and thermal load on the workpiece.
- Surface roughness: The increase in peripheral speed results in a slightly finer surface. By increasing the contact pressure, the surface becomes slightly rougher. The softer the material to be worked, the rougher the surface (if the same grit size is used).

Safety notes:
- As a rule, unmounted flap wheels should be used with the appropriate clamping flanges
- The maximum permitted peripheral speed is determined as follows:
- Unmounted flap wheels = 50 m/s
- Unmounted flap wheels for angle grinders = 80 m/s
- For safety reasons, it is imperative to remain within the stated maximum permitted rotational speed at all times