When making parts from metal, they have to be shaped correctly. Even a millimeter of excess could cause a motor or other machine to not work at all. Too much taken off could lead to leaks and loss of compression. That is why there is a need for precision grinding before anything is built or repaired. That takes the right equipment run by experienced people. People may not know what all goes into rebuilding a motor, but they will notice when it does not work.
When a company needs specialized metal products, they notice if the sizes are not right. Small parts not ground down correctly could halt production or lead to recalls. Imagine a company trying to build a prototype of the next big product that could keep the doors open and it failing to work. Precision grinding has to be done by people who know what they are doing. The machines involved take hours to learn and longer to master. The quality will be noticeable by the customers that get the end product, though. No detail is too small in the industry.
There are many ways to find out the reputation of a company when needing to find the right contractor for a grinding job. People in all industries do talk and this is why a company has to do the work right. Every potential client should research their choices when it comes to precision grinding. Jobs and lives will depend on quality work.