Cutting discs choosing

How to choosing the cutting discs including several factors.  But the most important factor is the desired end results such like high speed production cutting, precision, fine finish cutting,etc.  

1) Using the soft grade :

• Machine has low horsepower.
• Good finish is important
- fine grains normally used to provide minimum burr.
• Operators cut slowly.

2) Using the medieum grade

• Softer grades do not provide enough cuts
- longer wheel life is required.
• Cutting normal materials. Machine horsepower will support faster cutting rates.

3) Using hard grade : 

• Maximum wheel life is sought.
• Machine has adequate horsepower (1 hp per inch of wheel diameter is recommended).
• Burr and finish requirements are minimal. (note that fast cuts will produce a reasonably good finish)