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Title: |
1895 Article-Springfield Machine Tool Co., 18" Engine Lathe |
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Machinery Magazine Oct 1895 pg 63 |
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Insert Date: |
3/22/2011 10:05:36 AM |
A NEW TURRET ENGINE LATHE.
The demand for rapid lathe work, together with the increasing knowledge regarding the value of the turret lathe, has led to the adoption of the turret and sliding carriage on the regular engine lathe in place of the usual foot block or tail stock. This is the latest type of the 18-inch "Springfield Muller" engine with turret added, and is made by the Springfield Machine Tool Co., of Springfield, Ohio. The tool is carefully designed to meet the requirements for heavy service and, though very solid and rigid, the convenience of the operator has been carefully looked after. The principal dimensions are as follows, and will serve to show that the essential details have been carefully considered:
Diameter of front journal of spindle 2 ¾ in.
Length of front journal of spindle 4 ½ in.
Diameter of hole through spindle 1 5/16 in.
Diameter of largest step of cone 12 in.
Width of belt 2 ½ in.
Ratio of back gearing 12 to 1
Swing over bed 18 ¼ in.
Swing over carriage 12 in.
Weight 2,200 lbs.
The spindle is threaded but two-thirds of its length with a U. S. S. thread of 4 to the inch. This gives the face plate a straight bearing of one-third its length on the nose of spindle which aids in putting it in place and adds to wearing qualities.
The combination of a turret with the usual engine lathe offers advantages possessed by no other arrangement, if its use was contemplated in the original design and not an after consideration, so frequently the case. With this in view the wearing surfaces for taking the thrust on live spindle are of unusual proportions—more than equal to the requirements imposed on them when constantly used for chucking purposes.
Inasmuch as perfect alignment of turret is of vital importance, ample provision is made to accurately compensate for all wear tending to destroy same.
These turrets are made either to revolve automatically or by hand, and with or without power feed and stop attachment.
The parts necessary to automatically revolve turret are made of tool steel, with all surfaces subject to abrasion hardened. The turret is 9 inches in diameter, is bored to receive six tools and has a movement of 10 inches.
A desirable feature allows the use of an endless belt and so
avoids all the annoyance due to lacing or hooks. This enables
the desired tension to be given to the belt, so that in an extra
heavy cut the belt can be tightened to prevent slipping and again
slackened when the heavy duty is over. |
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