CHAPTER 15 APPENDIXES
Capacity Selection Calculation 15-15
15
Mechanism Features
Feed roll
The material on a plate (band) is sandwiched between rolls and fed.
Because the roll diameter is not obtained accurately, there is an
error in a long distance.
πcompensation is necessary.
Sudden acceleration causes slippage, resulting in shortage in the
feeding amount.
Table indexing
Because the moment of inertia of the table is large, a sufficiently
large reduction ratio is necessary.
The table rotation speed is low and a worm gear is usually used.
Spindle drive
Because winding of a wire material results in a larger moment of
inertia, a sufficiently large reduction ratio is necessary.
To achieve a constant surface speed, examination must be made,
including peripheral equipment.
Chain drive
Mainly used for the transfer line. Countermeasures against
elongation of the chain itself are necessary. Used mainly for
relatively large reduction ratios; the traveling speed of the
mechanical system is small.
Approximate machine constants
Approximate friction coefficient
µ
Mechanism Friction coefficient
Rail and iron wheel
(Carrier and crane)
0.05
Linear guide
Ball spline
Roller table
Roller system
0.05 to 0.2
Material density
Material Density kg/m
3
Copper 8.96 × 10
3
Brass 8.54 × 10
3
Stainless steel 7.91 × 10
3
Iron 7.85 × 10
3
Aluminum 2.7 × 10
3
Polyacetals 1.43 × 10
3
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