You have many options when choosing a screw manufacturing partner. When vetting possible partners, you may have questions about whether they can meet the needs of your application.
Forming screw threads by thread grinding is often a great choice for applications that require heightened accuracy or complex design. PST has a wealth of experience serving the needs of our customers through thread grinding.
In this blog, we dive into common questions about thread grinding, as well as PST’s related experience and capabilities.
What is thread grinding?
Thread grinding is the process of using a CNC machine with an abrasive grinding wheel to form screw threads. By cutting the screw threads into the material, the screw can meet stricter requirements than with other thread forming methods.
What are the advantages of making threads by grinding?
For screws that require complex or intricate threads, thread grinding can accommodate these designs. Thread grinding may also be the only thread forming method available for certain materials if they are too hard or brittle to be rolled, including those that have been heat treated.
Thread rolling vs thread grinding: When is it best to use one method over the other?
Thread rolling and thread grinding are both beneficial methods. Choosing which to use is typically driven by the specific application.
In general, it’s often best to use thread grinding when the application requires a high degree of accuracy or sizing. Threads are machined into the part at the final stages of manufacturing, often after heat treatment. Thread rolling generally requires heat treatment after the thread forming process, which can affect accuracy and sizing.
Thread grinding typically has more design flexibility than thread rolling. Thread grinding can accommodate many different features, while thread rolling may not be feasible on certain designs.
Thread rolling is recommended for high volume applications that are cost sensitive as well as those that require greater strength and fatigue resistance. Learn more about the differences between these thread forming processes here.
What is a typical application for ground screws?
WHAT Are the different types of ground thread?
- Acme threads – Used for moving and adjusting heavy loads
- Ball threads – Similar to acme screws but more accurate and efficient
- V-threads – Typically used for fastening two components together
- Trapezoidal threads – Metric acme threads
- Buttress threads – Comparable to acme threads except they have a “self-locking” feature built into the design of the thread profile
- Worm threads – Work with mating gears to transmit rotary movement of a gear
- Multi-start threads – Have more than one start, resulting in faster screw rotations
How are thread ground products typically produced?
Thread ground products are produced one at a time.
Given this, the cycle time drives a longer lead time. Though this may seem like an initial setback, quality is consistent due to repetitive runs. PST recently added a second thread grinder to help reduce lead times and drive even stronger competitive pricing.
How can straightness be ensured when thread grinding?
PST uses full measurement capabilities throughout the thread grinding process to ensure that the shaft remains straight.
What materials can PST thread grind?
PST has the capability to grind a variety of different materials including:
What is the maximum diameter and Length that PST can thread grind?
PST can thread grind materials up to 12 inches in diameter and 42 inches in length.
What thread grinding tolerances does PST offer?
PST can grind to accuracy grade C1.
What’s the first step when determining how to address A thread grinding related problem?
Contact PST. PST offers their support as an extension of the customers’ Engineering department. PST is your tread grinding partner. Our qualified team is ready to assist you.