Differences in the manufacturing of piston rod threads
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There are two methods for machining the threads that connect the piston rod to the crosshead: rolling threads and screwing threads. What is the difference between these two methods? Which one is better to use for diameters larger than 90 mm or in high-pressure sections?
These two types you mentioned should be the same, I believe it’s just a matter of different terminology. Generally, they are classified into rolling and cutting.
What is the difference between rolling and cutting? Which type of thread is generally chosen?
The strength must be high; it is advisable to use rolled threads for the connection of the piston rod
The stress acting on the piston rod is fatigue-related stress, and it is sensitive to defects; therefore, rolled threads should be used, as turned threads have many defects at their roots and are not suitable for piston rods