Tsubaki Nakashima Ball Screw

How to choose Ball screw

Points to check when selecting, with the values for this product (Tsubaki Nakashima Ball Screw).

1. 1. Determine lead from required speed and resolution

   Lead is the linear travel per shaft revolution. Listed products range from 1 to 40 mm. A larger lead allows faster feed at the same rotational speed but increases required torque and makes the travel per pulse coarser. Calculate it backward from maximum speed, maximum motor rotational speed, and positioning resolution.

2. 2. Select shaft outer diameter from load and rigidity

   Shaft outer diameter affects load capacity, rigidity, buckling load, and critical speed. Listed products range from 8 to 32 mm. For long overall lengths or high-speed rotation, a thicker shaft is required to avoid deflection and resonance. Check the permissible rotational speed including the support method.

3. 3. Verify life using basic dynamic load rating

   The basic dynamic load rating Ca is the axial load used as the reference for life calculation. Listed products range from 1950 to 16100 N. Calculate the rated life from the average operating load and travel distance, and confirm it meets the required service years. Life is approximately inversely proportional to the cube of the load ratio.

4. 4. Check shock loads against static load rating

   The basic static load rating C0a is the axial load permissible at standstill or under impact. Listed products range from 2600 to 33400 N. Confirm that a sufficient static safety factor is secured against maximum loads such as inertial forces during sudden stops and machining reaction forces.

5. 5. Select accuracy grade matching positioning accuracy

   The accuracy grade indicates the permissible lead error range; a smaller number means higher accuracy. Listed examples are mainly C5 with ground finish. Choosing a grade beyond what is required raises cost, so determine it by comparing with the required positioning accuracy.

6. 6. Balance backlash and preload torque

   Axial clearance for listed products is 0 to 0.03 mm. For applications where backlash (play on reversal) is undesirable in reciprocating motion, select preloaded types. However, a higher preload torque (2 to 25 N·cm for listed products) increases drive torque and heat generation, so verify it against motor capacity.

7. 7. Match overall length and shaft end machining to the equipment

   Overall length for listed products ranges from 85 to 2500 mm. Determine it by adding nut length and clearance to the stroke, including the mounting section for the support bearings. Long shafts face stricter constraints from critical speed and buckling, so consider them together with shaft outer diameter.

This guide was written by AI based on the listed products' documents and specification items.

About Ball screw and all products

Description

Offers precision ball screws centered on high-load, miniature, hollow shaft, and rolled ball screws, as well as bellows and support units for ball screws.

FAQ

Q. What types of Tsubaki Nakashima Ball Screws (FB, CB, HN, miniature) are available?

A. The lineup centers on precision ball screws and includes high-load, miniature, hollow shaft, and rolled ball screws, as well as bellows and support units for ball screws.

Q. Can Tsubaki Nakashima Ball Screws be used in machine tools and industrial machinery?

A. Their main applications are machine tools and industrial machinery.

Written by AI based on the content of the source documents.

Source documents

• Catalog ツバキ・ナカシマ精密ボール 製品カタログ 25 pages
  Found on: https://azuma-eg.com/catalogue/