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Spindle Selection Guide

How to select your machine tool spindle to perform various tasks like drilling, milling, grinding, turning etc.? There are many specifications to consider before buying spindles. We give below a selection guide to make the right choice. To buy any type of spindle, you need to know and specify certain things. These are as follows:

What operation needs to be performed by the spindle?
What are the operating parameters in terms of
- Speed
- Accuracy-Runout
- Power Requirements-at work or tool
- Tool or Work Holding Method
What is the type of Spindle Body? Whether
- Base Mounted
- Block Style
- Flange Cartridge
- Cartridge
- Special Configuration
What type of Lubrication is required? Whether
- Oil/Air
- Grease
- Recirculating Oil
What is the basic sizing of the spindle?
- Basic sizing for boring spindles front bearing diameter which is usually equal or larger than the bore being machined.
- Basic sizing for Face Milling Spindle, the face mill is somewhere around 1.5-2 times the front bearing diameter.
- Largest spindle that meets RPM and Quill Size requirements.
- Internal Grinding
  - Determine operating speed and wheel size
  - Know the type of wheel holding
    - Taper Shank Quill
    - Straight Shank Quill
    - Wheel Mount (For larger bores)
- External Grinding
  - Know the wheel size and operating speed.
  - What wheel mount is required based on wheel size?
  - Select spindle on the basis of top of taper of wheel mount.
What type of drive is required? Whether
- Belt Driven
- Direct Motorized
- Coupled Motor
- Gear Driven
What are the different factors to determine the type of spindle for any one given application? The various factors to consider are like
- Speed
- Rigidity
- Size constraints
- Lubrication
- Special Accuracy Requirements
- Motorized vs. Non-Motorized etc.

Any buyer interested in buying spindle can fill up the questionnaire given above and accordingly buy the spindle of his choice. The above questionnaire provides ample help to make the right choice.