A M E R I C A N S .

T A N D A R D

Accuracy of Engine
andTool Room Lathes
ASA 85.16-1952
UDC 621.94.002.1
One of a Series of Standards for
(REAFFIRMED 1972) Small Tools and Machine
Tool Elements

National Machine Tool Builders' Association

Society of Automotive Engineers
Metal Cutting Tool Institute
The American Society of Mechanical Engineers
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THE AMERICAN S O C I E T Y OF M E C H A N I C A L ENGINEERS

United Engineering Center 345 East 47th Street
O New York 17, N. Y.

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 Foreword
In 1940 a standard for Accuracy of Engine Lathes, developed b the Engine Lathe Group of
the National Machine Tool Builders’ Association, was adopted by t e NMTBA as an Association
standard and submitted to the American Standards Association for approval as an American
K
Standard.
Shortly afterward, the National Machine Tool Builders’ Association asked that the ASA Emer-
gency Procedure be applied to the present standard, to expedite its ublication. The members
of the ASA Sectional Committee on Small Tools and Machine Tool lements (BS), as key indi-
viduals in the sense of ASA Emergen.cy Procedure, were canvassed on this question and also on
E
the question of approval of the standaI’d as an American Defense Emergency Standard.
Upon favorable recommendation by the members af sectional committee B5, and the Mechani-
cal Standards Committee of the ASA, the standard was approved as an American Defense Emer-
gency Standard on May 1, 1941.
In 1948 the NMTBA adopted a set of tolerances for 40-to 72411. lathes and requested that they
be included in a revised ASA standard. They also eliminated the 36411. lathe because that size
had been dropped by all makers. These changes were approved by Technical Committee No. 25
in December, 1948, and recommended for adoption.
A revised draft was pre ared, dated February, 1949, which was approved by the sectional com-
R
mittee and submitted to t e sponsor bodies for their approval. During the review by the sponsors
some suggestions for additional changes were developed and were approved by the technical com-
mittee and the sectional committee. Sponsor a prova1 followed, and the proposal was then pre-
P
sented to the American Standards Association or approval and final designation as an American
Standard. This designation was given on April 7, 1952.

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Officers of Sectional Committee on Standardization of Small Tools
and Machine Tool Elements
P. L. Houmr, Chairman L. M. DPlcher, Secretary
Personnel of Technical Committee 25.onAccuracy of Engine and Tool Room Lathes
A. F. Murray, Chairman, Works Mgr., Electrolux Corp., Old Greenwich, Conn.
John Haydock, Editor, Metal Working, Sutton Publishing Co., New York, N. Y.
F. O. Hoagland, Master Mechanic, Pratt & Whitney Div., Niles-Bernent-Pond Co., West Hartford, Conn.
Eric Oberg, Consulting Editor,“Machincry,” The Industrial Press, New York, N. Y. (Deceused)

Copyright, 1952, by
The American Society of Mechanical Engincers
Printed in U. S. A.

Any part of this standard may be quoted. Credit lines should read: “Extractedfrom -4merican
Standard Accuracy of Engine and Tool Room Lathes ( A S A B5.16-1952),with the pertnissiort of
the publisAer, The American Society of Mechanical Engineers, 29 West 39th Sireet, New York 18,
N. Y.

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 -
ASME B 5 . 3 b 5 2 m 2575532 003b5b3 4 m

American Standard

Accuracy of Engine and Tool Room Lathes

Recommended Standards

Engine Lathes
Te8t
Tool Room
Lathes 12 In. to 18 In., 20 In. to 32 In., 10 In. to 72 In.,
Incl. Incl. Incl.

A
When Using When Using When Using When Using
Precision Level Precision Level Precision Level Precision Level
All Readings All Readings All Readings AU Readings
to Be Within to Be Within to Be Within to Be Within
0.0005 o.ooo5 0.001 0.001
in 12 In. in 12 In. in 12 In. in 12 In.
BED LEVEL-TRANSVERSE DIRECTION

When Using When Using When Udng When Using

Precision Level Precision Level Precision Level Precision Level
Along Bed Along Bed Along Bed

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Maximum Read- Maximum Read. qlong Bed
Maximum Read- Æaxunum Read
ing to Be Within ing to Be Within ing to Be Within zg to Be Withi
o.Ooo5 o.Ooo5 0.001 0.001
in 12 In. in i2 In. in 12 In. in 12 In.
--
BED LEVEL- LONGITUDINAL DIRECTION

Maximum Read- Maximum Read. Maximum Read. daximum Read

ing Along ing Along ing Along ing Along
Length of Bed Length of Bed Length of Bed Length of Bed
0.0005 0.00075 0.00 1 0.001
in 48 In. in 48 In. in 48 In. in 48 In.
Lihcc--I

TAILSTOCK WAY ALIGNMENT

Total Total Total Total

Indicator Indicator Indiicator Indicator
Reading Reading Reading Reading
o to o.oO04 o to 0.0005 O to O.ûO075 o to 0.001

SPINDLE CENTER RUNOUT

Total Total Tow TOW

Indicator Indicator Indicator Indicator
Reading Reading Reading Reeding
O to 0.0004 O to 0.0006 O to O.o(N75
O to 0.0003

SPINDLE NOSE RUNOUT

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 ASME B 5 . 3 6 52 2595532 0036564 6

AMERICAN STANDARD

Recommended Standard

Test Engine Lathes

Tool Room ~ ~P

Lathes 12 In. to 18 In., 20 In. to 32 In., 90 In. to 72 In.,

Incl. Incl. Incl.

Total Total Total Total

Indicator Indicator Indicator Indicator
Reading Reading Reading Reading
Witt Indicator With Indicator With Indicator With Indicator
on Rear Side on Rear Side on Rear Side
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on Rear Side
U of Test Plate of Test Plate of Test Plate of Test Plate
O to 0.0003 O to 0.0005 O to 0.00075 O to 0.00075
CAM ACTION Of SPINDLE

TOW Total Tohi TOW

Indicator Indicator Indicator Indicator
Reading Reading Reading Reading
at End of at End of at End of at End of
12 In. Test Bar 12 In. Test Bar 12 In. Test B u 12 In. TRst Bar
O to 0.0006 o to O.Ooo8 O to 0.00125 O to 0.0015
at End of at End of at End of at End of
Spindle Nose Spindle Nose Spindle Nose Spinde Nose
O to 0.0003 o to o.Oo04 O to 0.0006 o to 0.001
SPINDLE TAPER RUNOUT

High High High High

at End of at End of at End of at End of
12 In. Test Bar 12 In. Test Bar 12 In. Test Bar 12 In. Test Bar
O to 0.0005 o to 0.001 o to 0.001 O to 0.0015
I

HEADSTOCK ALIGNMENT -VERTICAL

At End of At End of At End of At End of

12 In. Test Bar 12 In. Test Bar 12 In. Test Bar 12 In. Test Bar
O to *0.0003 O to *0.0005 o to *0.0008 o to *0.001

HEADSTOCK ALIGNMENT- HORIZONTAL

O
Forward Forward
Forward Forward at End of
at End of at End of at End of Spindle
Spindle Spindle Spindle When Fully
When Fully When Fully When Fully Extended
Extended Extended Extended o to. 0.001
O to 0.0005 O to 0.0005 o to 0.0005

TAILSTOCK SPINDLE ALIGNMENT - HORIZONTAL

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 ASME B 5 - 3 b 52 W 2 5 7 5 5 3 2 0 0 3 6 5 6 5 A

ACCURACY OF ENGINE AND TOOL ROOM LATHES

Recommended Standards

Test Engine Lathes

Tool Room ~ ~~

Lathes 12 In. to 18 In., 20 In. to 32 In., H) In. to 72 In.,

Incl. Incl. Incl.

Hieh Hieh High sigh

at End of at End of at End of at End of
Spindle spindle Spindle Spindle

TAILSTOCK SPINDLE ALIGNMENT

- - VERTICAL
When Fully
Extended
O to 0.0005
When Fully
Extended
O to 0.0008
When Fully
Extended
O to 0.0015
When Fully
Extended-
O to 0.0015

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End of End of End of End of
12 In. Test Bar 12 In. Test Bar 12 ki. Test Bar 12 In. Test Bar
O to *0.0005. o to *O.o008 O to *0.0015 O to *0.0015

TAILSTOCK TAPER ALIGNMENT - HORIZONTAL

mxh Higa mxh Eiieh

at End of at End of at End of at End of
12 In. Test Bar 12 In. Test Bar 12 In. Test Bar 12 In. Test Bar
O to 0.0005 o to O.oo08 O to 0.0015 O to 0.0015

TAILSTOCR TAPER ALIGNMENT -VERTICAL

High at High at
High at Tailstock Taiistock
Tailstock o to 0.004 o to 0.005
o to 0.002
I u
I---)
~~ ~ Ø
VERTICAL ALIGNMENT OF
HEAD AND TAIL CENTERS

I5 Readhgs f o r base /mgth bed faken wit,! Parallel Parallel Parallel Parallel
l w d s c r e w siafiona Add aOO/inch f o r With Ways with ways With Ways With Ways
each addiflone/ o f b r d /engfb o to o.oci4 o to 0,004 O to 0.006 o to 0.006
Horizontal Horizontal Horizontal Horizontal
n
o to 0.004 o to 0.004 O to 0.006 o to 0.006
Vertical Vertid Vertical Vertical
Alignment Alignment Alignment
of Half Nut of Haif Nut of HaU Nut
Horizontal Horizontal Horizontal Horizontal
or Vertical or Vertical or Vertical or Vertical
O to 0.006 O to 0.006 O to O.QO8 O to 0.008
LEAD SCREW ALIGNMENT

5
. -

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 ~

ASME B 5 * 3 b 5 2 2575532 00365bb T W

AMERICAN STANDARD

Recommended Standards

Engine Lather
Tool Room
Lather 12 in. to 18 In., 20 In. to 32 In., 40 In. to 72 In.
Incl. Incl. Incl.

Morimum Mufmum MaXimUUl MaximUm

0.0003 O.ooo( 0.0005 0.00075
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LEAD SCREW CAM ACTION

To Face To Face To Face To Face

Hollow or Hoiiow or Hollow or Hoiiow or
Concave Only Concave Only Concave Only Concave Only
on 12 In. on 12 In. on 12 in. on 12 In.
Dimeter Dimeter Diameter Diameter
O to 0.0005 o to 0.001 o to 0.001 o to 0.001
CROSS SLIDE ALIGNMENT

On Diameter On Diameter On Diameter On Diameter

o to 0.0005 o to 0.001 o to 0.0015 o to 0.0015
on Face on Face on Face on Face
at Nominal at Nominal at Nominal at Nominal
Diameter Diameter Diameter Diameter
o to 0.001 O to 0.0015 o to 0.002 o to 0.002

FACE PLATE RUNOUT

9 Face and Face and Face and Face and

Periphery Periphery Periphery Periphery
0.003 0.003 0.004 0.005
Face of Steps Face of Steps Face of Steps Face of Steps
0.003 0.003 0.004 0.005
B u Test 3 In. Bar Test 3 In. Bar Test 3 In. B u Test 3 In.
From End of Jaw ?rom End of Jaw From End of Jaw rom End of Ja1
Bar Diameter Bar Diameter Bar Diameter Bar Diameter
Same as Hole Same as Hole Same as Hole Same as Hole
0.003 0.003 0.004 0.005
CHUCK- RUNOUT

!O

n
1 In. From 1 In. From 1 In. From No Collets
Collet Chuck Collet Chuck Collet Chuck Used on
o to 0.001 o to 0.001 o to 0.001 These Lather

COLLET CHUCK - RUNOUT

6

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 .y

ASME B 5 . 3 b 52 2575532 0016567 3 H

ACCURACY OF ENGINE AND TOOL ROOM LATHES

Recommended Stuidudi,

Engine Lathei
Tool Room
Lathes 12 In. to 18 In., 20 In. to 32 In., PO In. to 72 In.
Incl. Incl. Incl.

0.0003 O.OOO4 O.OOO8 0.001

LATHE MUST TURN ROUND

WITH WORK MOUNTED IN CHUCK

22
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0.0008 0.0015 0.002 0.002

LATHE MUST TURN CYLINDRICAL-

-N A 12 IN. LENGTH OF WORK-
PIECE MOUNTED IN A CHUCK

23

O.OOO4 O.OOO8 0.001 0.001

LATHE MUST TURN C Y L I N O R I C A L ! !

-N A i 2 IN. LENGTH OF WORK-
PIECE MOUNTED ON CENTERS

24
LEAD SCREW - LEAD PER FT. =to.001
*O.o004
*0.0015
t0.0005
t0.002
+O.OOO7
*0.002
*0.001
LEAD IN ANY 4*

25
BACK LASH ON CROSS FEEDS SCREW 0.004 0.004 0.005 0.005
0.001 0.001 0.005 0.005
O N COMPOUND REST SCREW

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 American Standards for Small Tools and Machine Tool Elements

TITLE OF STANDARD

Chucks and Chuck Jaws, B5.8-1954 . . . . . . . ... ... ... ... ... ... ... ... ... ... ... ...
Accuracy of Engine and Tool Room Lathes, BT. 16-1952
Circular and Dovetailed Forming Tool Blanks, B5.7-i954

Drill Drivers, J33.27-1951 . .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... .. ... ... ... ... .
Carbicie .Blanks and Cuttink Tools,B5.36-1957,
Involute Splines, B5.15-1950
Involute Serrations, B5.26-1950 . . . . . . . . . . .. .. . .. .. . .. .. .. .. . .
Involute Spline and Serration Gages and Gaging, B5.31-1953 >
. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ..... ... ... ... ... ... . .
Jig Bushings, B5.6-1941 (Reaffirmed 1949.)
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Knurling, B5.’30-19!53.
Machine Pins, B5.N-1954
Machine Mounting Specifications for Abrasive Discs and Plate Mounted Wheels, B5.3)-1957
Punch and Die Sets for T.wo-Post Punch Press Tools, B5.25-1950 . . . . . . . . ..
Rotating Air Cylinders and Adapters, B5.5-1954
Single-Point Tools and Tool Posts, B5.22-1950
...............
...............
Spindle Noses for Tool Room Lathes, Engine Lathes, Turret Lathes, and Automatic
Lathes, 85.9-1954 ......................... .
Spindle Noses and Adjustable Adapters for Multiple Spindle Dtilling Heads, B5.11-195’4
Spindle Noses and Arbors for Milling Machines, B5.18-1953- . . . . . . . . . . .
T-Slots, Their Bolts, Nuts, Tohgues, and Cutters, B5.1-1949. . .. ... ... ... ... ... ... ... ...
Straight Cut-Off Blades for Lathes and Screw Machines, B5.21-1949
Life Tests of Single-Point Tools, B5.19-1946 (Reaffirmed 1953;)
. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ..... ... ... . .
Life Tests for Single Point Tools of Sintered Carbide, B5.34-1956
Twist Drills, B5.12-1950.
Machine Tapers, B5.10-195’3
. . . . . . . . . .. .. .. .. .. .. .. .. .. . .. .. .. . .
Milling Cutters, B5.3-1950
Nomenclature for Milling Cutter Teeth, B5cl-1947
Reamers, B5.14-1949. . . . . . . .. . .. .. .. .. .. .. .. .. .. .. .. . .. .. .. . .
Taps-Cut and Ground Threads, B5.4-1948
Markings for Grinding Wheels, 85.17-1949. (Reaffirmed 1953.). . . . . . . . . .. ..
Mounting Dimensions of Lubricating and Coolant Pumps for Machine Tools, B5.28-1952
Designation and Working Ranges of Grinding Machines, B5.32 and 33-1953 ......
Price of special binder for holding these standards, $3.25.
20% discount to ASME members.
A complete list of American Standards published by The American Society of Mechanical Engineers
obtainable upon request.

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