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A main component of this spindle is the motor, stored internally. Internal Motor: limited power and torque due to restricted space within the spindle housing; Speed Range: 20,000 [3]-60,000 RPM [2] (top speed according to design) Advantage: high top speed expands application use; Disadvantage: sensitive life range according to use
A slower feed rate usually results in a finer surface as more cuts are made for any length of wood. Spindle speed becomes important in the operation of routers, spindle moulders or shapers, and drills. Older and smaller routers often rotate at a fixed spindle speed, usually between 20,000 and 25,000 rpm.
Ultra-high speed grinding (UHSG) can run at speeds higher than 40,000 fpm (200 m/s), taking 41 s to remove 1 in 3 (16 cm 3) of material, but is still in the research-and-development (R&D) stage. It also requires high spindle power and high spindle speeds.
Steep tapers (e.g., NMTB and derivatives) tend to lose rigidity and accuracy at high speed, as their solid shanks are stiffer than the spindles they fit into. Under high centrifugal force, the spindle expands more than the toolholder which changes the overall length: That is, as the spindle spreads outward, the toolholder tends to move deeper ...
Second operations can be completed by using a sub-spindle, which is co-axial to the main spindle, but faces the other direction. This allows the part to be removed from the main spindle, and for additional features to be machined in the back side of the part. Plasma cutter: Involves cutting a material using a plasma torch. Commonly used to cut ...
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For example, using a high spindle speed with an unbalanced wooden blank may cause the lathe to vibrate dangerously. Spinning a large turning blank too quickly may cause it to explode. Inappropriate use of tools such as gouges and skew chisels can cause a catch , where the tool bites suddenly and aggressively into the wood in an uncontrolled manner.