Mechanism

CHAPTER 15 APPENDIXES

Chain drive

Features

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.

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.

 Approximate machine constants

Approximate friction coefficient µ

Mechanism

Rail and iron wheel

(Carrier and crane)

Linear guide

Ball spline

Roller table

Roller system

Friction coefficient

0.05

0.05 to 0.2

Material density

Material

Copper

Brass

Stainless steel

Iron

Aluminum

Polyacetals

Density kg/m 3

8.96 × 103

8.54 × 103

7.91 × 103

7.85 × 103

2.7 × 103

1.43 × 103

15

Capacity Selection Calculation 15-15