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Tee Joint

Joints where the pieces come together at right angles to each other are called tee joints.A tee joints has welding surfaces areas (fusion faces) in close proximity to each other and more area for heat to dissipate to than any other basic joint.That is why tee joints require more heat for proper fusion and good welding than the other joints.Turn up your heat when appliying a fillet weld to a tee joint.
There are joints that needs as much heat as a tee joint, such as theroot pass of a V-groove weld with a 1/4-inch root opening and backing plate.Welding this first pass requires more heat for the same reason a tee joint does- the close proximity of multiple fusion faces on the joint.
( Todd Bridigum, How To Weld, p.47)

Bayonet-type clamping

In this system, a bayonet disk is used.The disk is provided with holes, sligthly bigger than the heads of the fixing screws. The clear holes are connected with slots, slightly (0,5) bigger than the threaded diameter. The bayonet disk acts like a special washer. Rotating the disk to align the bigger holes with screw centers, allow allows removal (or insertion) of the plate without removing entire screws (or Nuts). Rotation of the disk in the opposite direction brings the smaller slots to the screw centers. Tightening the screws in this position, secures the workholder to spindle nose. Thus, we only have to losen screws/nuts by a quarter turn, to remove the
bayonet disk and the workholder. Similary, securing workholder requires the rotation of the bayonet disk through small angle (15 degree), and turning the clamping screws/nuts through a small angle, to tighten them.
(P. H. Joshi, Machine tools handbook: design and operation, p.374)

Kudinov’s expression

Shows the polar curves for combined (tool face and flank) force, for 3 different values of flank wear. At zero frequency (w), the polar curves intercept the real axis R at x=Ks, the static characteristic. It has been observed that the flank wear land dampens the vibrations. Also, as the flank wear increases, there is a reduction ,n the frequency range, in which the dynamic cutting force lags behind the displacement. For flank wear land of 1 mm, frequency (w)=1,000. For all vibrations with frequency (w)>150hz, the cutting process provides a damping effect. There are more vibrations during actual metal cutting.
(P. H. Joshi,Machine tools handbook: design and operation, p.512)

Hydro-dynamic bearings

Hydro-dynamic bearings or fluid film bearings provide for high precision anf a long
life span due to their inherent good damping and heat dissipation properties, and the
absence of any metal to metal contact. The journal (spindle) acts like a pump, delivering
oil into the clearence between the shaft and the bearing. However, the narrowing clearance
in the direction of rotation, causes pressure rise till the hydro-dynamic force counter-balances
the load on the bearing
(P. H. Joshi,Machine tools handbook: design and operation, p.388)