Electrical news and engineering . s room furiniprii\ ement in the substitution of individual for groui)dri\e. This condition is gradually being remedied, duegreatly to the co-operation, of motor manufacturers. -\t thepresent time there are manufactured motors tliat will :;. f un>lanl speed auxiliary dri\es. When Constant Speeds are Used The constant speed main drive is the ease of a constantsiK-ed motor, where all changes of spindle speed and feedare effected by mechanical means, such as gears or speciall)ullcys. In Canada it is uncommon to find direct current usedfor this purixise,
Electrical news and engineering . s room furiniprii\ ement in the substitution of individual for groui)dri\e. This condition is gradually being remedied, duegreatly to the co-operation, of motor manufacturers. -\t thepresent time there are manufactured motors tliat will :;. f un>lanl speed auxiliary dri\es. When Constant Speeds are Used The constant speed main drive is the ease of a constantsiK-ed motor, where all changes of spindle speed and feedare effected by mechanical means, such as gears or speciall)ullcys. In Canada it is uncommon to find direct current usedfor this purixise, but its use is nuite prevalent in England,bither shunt or compound-wound motors are used. Theshunt motor will suit the majority of cases, but where themachine tuol possesses a large flywheel effect the com-pound-wound motor is preferable, as the sliced variationwith alteration of load is .greater than the shunt-woundmotor. This enables the flywheel effect to be utilized moreefficiently for overcoming sudden and peaky loads. It is. ilcvt|c_|ml ni England. Traversing, by separate courtesy Alfred Herbert, Limited take care of any machine tool service, and the result is thatmany machine tools are sold with the motor an integralpart of the machine. This of-course, helps the general adop-tion of individual drive. There are certain cases where group driving serves thepurpose of highest economy but for tools requiring- approxi-mately 5 or above the individual motor drive has anoverwhelming advantage, owing, ai-i-iong other things to thereduction of total power required, to the improved illumi-nation obtainable in the shops, to the greater flexibility inlocating machinery, and finally, wdiat is of vital importance,the increase in output per unit machine. There are variations in the type of drive required. Thefollowing list enumerates the main classes:— 1. Constant speed inain drives. 3. Variable speed main drives, also advisable to adopt a compound-wound mo
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