DINGS - Precision Motion Specialist

Product Selection Guide

1. General Specifications

All references for lead screws in DINGS’ have following characteristics.

Lead Screw Material: 303 Stainless precision cold rolled steel
Screw Coating: Teflon coating is optional
Standard Screw Accuracy (Lead Accuracy): 0.0071 inch/foot (0.18mm/300mm)
Screw Straightness: 0.15mm/300mm
Screw Efficiency: From 35% to 85% dependent on lead. Also depends on the usage of an Anti-Backlash nut with screw. The larger lead, higher efficiency of screw.
Operating Temperature: -20°C to 55°C
Storage Temperature: Storage at room temperature with a relative humidity as lower than 75%, clean, well ventilated and free from corrosive gases.
Screw Backlash: Generally around 0.01~0.1mm
System Backlash: Includes screw, motor and attached mechanics. This will be the sum of all backlash in customer's motion axis.
Nut Material: POM/PBT with Self-Lubricating material.
Wear Life of Screw and Nut: Depending on the load, speed, and environment, it is typically millions of cycles.

Note

DINGS' Linear systems are manufactured from high quality materials. Because of variable effects of friction, lubrication and cleanliness, exact life cycle can not be predicted.

2. How to choose DINGS' product?

STEP 1 - CHOOSING A MOTOR SIZE (FORCE REQUIREMENTS)

Here is a general overview of the Output Thrust vs. Motor Size:

In a mobile environment, you can move left and right to see the contents (tables).

Lead Screw Linear Actuators
	Motor Size(mm)	Max Thrust(N)	Recommended Load Limit(N)
Lead Screw Linear Actuators	14	19	15
	20	70	45
	28	150	140
	35	300	230
	42	600	230
	57	1300	910
	60	1560	910
	86	2400	2270

STEP 2 - CHOOSING A SCREW LEAD (FORCE AND SPEED REQUIREMENTS)

After estimating the required thrust and choosing a motor size that may fit your application, the speed and acceleration of the load must be considered and evaluated to choose and appropriate screw lead.

Due to the nature of lead screws, the output speed and output thrust achievable by a motor/lead screw combination are two proportional. increasing the required thrust will lower the achievable speed for a motor/lead screw combination. Therefore, the maximum output force of a system is lowered for applications that requires higher speed.

For complete motor/lead screw selection data, please refer to the Speed vs. Thrust curves for each motor size.

Although these two steps provide a solid foundation in motor/lead screw selection, other variables must also be considered:

Duty Cycle
Desired Life of a System
Environmental Considerations
Positional Repeatability
Acceptable Backlash
Acceleration / Deceleration
Driver Specifications
Vertical or Horizontal

Because of the numerous variables involved in motor selection. We highly remommended for users to proceed with physical testing to accurately determine the motor/lead screw combination required for a given application.

One of the most common methods of moving a load from point A to point B is through linear translation of a motor by a mechanical lead screw and nut.

This section is here to assist and refresh your understanding of the basic principles of lead screw technology. Some basic design consideration are as follows:

1. What is the load of your system?
2. What is the required linear speed?
3. What is the distance to be travelled?
4. What accuracy does your application require?
5. What is the required time to move from point A to point B?
6. What repeatability does your application require?
7. Orientation is Horizontal or Vertical?

NOTE

Although this section aims to provide a rough guideline to select a motor/lead screw combination that best fits an application, we recommend to contact our application engineering staff or sales representatives for further assistance with the motor selection process.