First Choice in Speed Controls The winding of wire on toroidal cores is a precision machine operation — one requiring COMPLETE control from beginning to end. Typical rheo stat or inductor production may call for use of wire ranging in size from No. 25 to 35; and on occasion the job may require work with heavy wire ribbon VA1 wide or more. The high degree of flexibility required is best provided by the Variac Motor Speed Control, specifically designed for machine tool and other ex acting manufacturing operations. Continuous speed control over wide ranges — full torque at very low as well as at very high speeds — and an absolute minimum of torque pulsation or "jumping" which often causes rejects — are but a few of the features incorporated in this equipment to make it one of the finest motor speed controls on the market today. G-R Variac Motor Speed Controls will operate d-c shunt, compound, or series motors from a-c lines, providing all the advantages of d-c motor per formance with the convenience of operation from readily available a-c power. Units are available with ratings ranging from Vis t o I Vit hp, in either rugged industrial-type cabinets or as stripped-down models for assembly as integral parts of other equipment. Prices (less motor) range from $85 to $380 for cabinet models; $72 to $358 for basic stripped-down units. Quantity discounts apply. Write for complete information
V e r s a t i l i t y — the G-R Control op erates at high speeds for wire winding, is equally useful for work with heavy ribbon at considerably slower speeds — same control does both jobs· without need for pulley or gear changing. F u l l - T o r q u e S t a r t s permit opera tor to watch and carefully control work at slow speeds when correct wire pitch and space distribution must be determined. S m o o t h A c c e l e r a t i o n with conslant torque eliminates sudden pulling of wire and possible breaking or flexing. P a s t S t o p p i n g permits automatic motor shut-off exactly to the turn — extremely useful in many machine operations. M o t o r R e v e r s a l with flick of switch — extremely convenient when magazine of the winding machine must be loaded. L o n g L i f e with minimum maintenance — no electron tubes; built in overload pro tection prevents motor burnout. These characteristics have proven useful to many. They can also be of service to you.
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T h e R e xRheostat C o m p a n y has experimentally controlled its winding machines with a wide variety of both electrical speed controls and mechanical devices. None were found to compare in performance to the G-R Control now specified for plant-wide use. Production-control engineers and machine operators alike appreciate this Control's ease of handling and high production efficiency.
GENERAL RADIO Company
All G - R P r o d u c t s
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are now covered by a
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1182 Los Altos Ave., Los Altos, California SAN FRANCISCO for farther information, circle number 79 A ea Readers' Service Card, pate 101 A
VOL 49, NO. 8
AUGUST 1957 7 9 A
