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History of the 10ee - Gospel according to Monarch

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Below timeline direct from a preprinted 10ee history sheet-

1939 -First machine designed as what is now called the "old height lathe".

* 12" swing over the bed and 20" centers, with D-1-3 spindle nose
* 30 feeds from 0.001 to 0.0075 IPR (inches per spindle rev.).
* 50 thread combinations from 3 to 92 threads per inch.
* 25 to 2500 rpm infinitely variable spindle through a Sundstrand hydraulic hydrostatic drive, belted directly to the spindle.

*First machines shipped to:

S/N EE-6156 Precision Scientific Company Chicago, IL
S/N EE-6207/8 Woodward Governor Company Rockford, IL

1941 Reliance 3 HP DC motor and motor-generator set replaced the hydraulic spindle drive.

* Offered 30 to 3000 rpm, 35 to 3500 rpm and 40 to 4000 rpm speeds, accomplished by changing sheave diameters and belt lengths.
* In later years, the standard range was to become 40 to 4000 rpm.

1944 Machine redesigned to today’s "new height lathe". Actually the "old" and "new" versions were both shipped for a period of about a year starting in 1944 and continuing into 1945.

* 12.5" swing over the bed and 20" centers, with D-1-3 spindle nose
* 50 feeds from 0.0005 to 0.016 IPR (inches per spindle rev.).
* 60 thread combinations from 3 to 184 threads per inch.
* 30" centers machine was introduced. Manufactured up to 1970. Sales heavily concentrated in US government installations.

1949 Thyratron vacuum tube rectifier DC electronic drive replaced the Reliance rotating motor-generator set.

* Became better known as the "works in a drawer" drive.
* Multiple vacuum tubes were used to control the rectifier tubes.

1950 Electronic drive was redesigned and updated.


1960 Thyratron vacuum tube rectifier DC drive with a solid state control module replaced the "works in a drawer" drive.

* Was to become known as the "module drive".
* All solid state except for the thyratron rectifier tubes.
* 5 HP DC motor first used.
* Approximately 3000 units shipped with this drive.

1970 Introduced combination English/metric gearbox and English/metric screw dials at the Chicago IMTS exhibition.

* 50 English feeds from 0.0005 to 0.016 IPR.
* 50 metric feeds from 0.013 to 0.406 mm/rev.
* 60 English thread combinations from 3 to 184 threads per inch.
* 26 metric threads pitches from 0.25 to 11 mm.

1983 Entirely Solid state DC drive replaced thyratron tube drive.

*Known as the "armature regenerative spindle drive"
*5 HP DC motor remained as standard.

1995 Introduced AC Inverter type spindle drive in place of DC drive.

* 7.5 HP AC TEFC motor – standard on new machines.
* Made available for field retrofit and factory rebuilding.

1998 Optional 10HP AC Inverter drive, without 5:1 back gear reduction unit, first made available for field retrofit and factory rebuilding.

Important Note: The Monarch 10"EE has always used a flat feed belt coupling from the headstock spindle to the gearbox, whenever the machine is in the feed mode. Thus any gear impulses that might affect the outstanding finishing capability of this precision lathe are eliminated. In the threading mode, the headstock spindle is gear coupled to the gearbox.

(end of Monarch 10ee history sheet)

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I inquired about prices on 10ee's and the number manufactured and found out the following-

*In 1946, the base price was $4,194. In 1955, it was $7,400. In 1965, it was $9,775. Today's price is $79,950 (they have one in stock :))

To see how the current price compares to past prices, I checked the consumer price index for 1965, and come up with a figure of $9,775 in 1965= $54,373 in 2002, so today's prices are not quite as high as they might seem, esp. considering the low production compared to past years.

*Approximately 8000 EE's have been shipped since 1955, but how many before that, they are not sure. Between the beginning of 1940 and the end of 1945, 28,689 lathes were shipped from the facility; a portion but not all were EE's. They have the lathe records on every machine, they just do not have them listed for easy counting.

Kudos and many thanks to Darcy Dill, Sales Manager at Monarch Lathes, for digging up this info
 








 
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