Millions of threaded parts and components come from machine shops and manufacturers, each day. Threads are an important part of most applications, and there are several ways to make them. For instance, you can use thread grinding or thread rolling for iron parts. So which method is best? Let’s explore the pros and cons of both.
What is Thread Rolling?
Suppose you need to create several thousand threaded bolts about 4 inches in length. If you have a thread rolling machine, you can place blanks in the machine. A blank is a round piece of metal the same diameter as the finished product. Each blank presses hard against a die and as it rolls through the machine, it cuts threads into the blank.
Rolling is a quick process, and there’s no need to heat up the blanks beforehand. You can create a lot of threaded bolts and items in a short amount of time.
Thread Grinding
It’s possible to cut or grind threads into any cylindrically shaped object. The workpiece goes into the machine, and a high-speed grinding wheel cuts the threads into the metal one at a time. This process is slower than rolling, but it is very precise. In fact, you can get extremely accurate cutting and make a variety of special threads with this method.
Problems with Rolling
When you roll threads something unusual happens. The finished shaft is smaller than the threads. Also, you can’t produce precision threads with rolling methods.
Which is Better?
Whether you choose thread grinding or rolling, it depends on your needs. For instance, if you want to mass-produce a lot of bolts or nuts for standard hardware for products like garden tools and other items, then rolling is a good idea. However, when you need precision threads for important commercial or industrial applications, then grinding is the better choice.
