will a 7in diamond blade work on an 8inch saw?

Using a 7-inch diamond blade on an 8-inch saw is technically possible, but there are several factors to consider:

1. Compatibility: Ensure that the blade's arbor hole is compatible with the saw's spindle. The size of the arbor hole must match the arbor size of your saw.
2. Safety: A smaller blade may not fully cover the saw's blade slot, which could lead to vibrations and potentially unsafe operation. Always follow the manufacturer's safety guidelines.
3. Performance: A smaller blade may not perform as efficiently as a larger one, especially if the saw is designed to handle the larger size. The smaller blade might also wear out faster due to increased stress on the smaller cutting surface.
4. Cutting Depth: With a smaller blade, you may not be able to cut as deep or as wide as you would with an 8-inch blade, which could limit the types of cuts you can make.
5. Manufacturer's Recommendations: Check the saw manufacturer's recommendations for blade sizes. Some saws may not be designed to operate safely or effectively with a blade size that is not within a certain range.
6. Blade Speed: Different blade sizes may require different operating speeds to maintain optimal cutting performance. Ensure that your saw can adjust to the speed required for a 7-inch blade.
7. Warranty: Using a blade size that is not recommended by the saw manufacturer could potentially void the warranty.

In summary, while it might be possible to use a 7-inch diamond blade on an 8-inch saw, it is generally best to use a blade that is designed for your specific saw to ensure safety, optimal performance, and longevity of both the blade and the saw.