How To Select
The RIGHT Drill Bushing - Page 3
BUSHING KINDS AND WHEN TO USE THEM
- CONTINUED
KNURLED BUSHINGS
Two patterns - straight splined, and grooved diamond knurled - are
made for imbedment in jigs made of laminated glass fibers, potting compounds, castable and
soft materials, etc. While all patterns have exceptional self-locking grip and holding
power, straight splined bushings may be desirable where the bushing O.D. is used for
locating another jig, fixture, or work tool. The splined bushing is also more easily
pressed into a plastic-type jig (see Installation Suggestions, Page1). Grooved diamond
knurled bushings are superior in holding strength, the grooves acting as internal
shoulders.
OIL GROOVE BUSHINGS
Oil groove bushings provide positive, complete drill lubrication,
and are ideal for applications that require cooler running drills, such as drilling
hardened steel. Lubricant (or coolant) works through the bushing via grooves in the I.D.
Wall. Many groove styles are available, as are wiper designs that guard against dirt or
chips. These bushings are ideally suited as lubrication, probe bar, die casing, die set
and hydraulic press bushings.
SPECIAL BUSHINGS
| We give special attention to
special bushings - bushings with special diameters, special shapes, special angles,
special grooves, special materials, special threads, special set-screw holes, special
mounting flanges, etc. Special bushings fall into two categories: a) a modified standard -
where an ANSI or Economy Standard Length is modified in I.D., O.D., or length; and b)
custom bushings made to solve a particular engineering or production problem. These
bushings provide for all bushings not available as a standard or a modified standard
bushing. These include special shapes, angles, materials, threads, etc. WHATEVER YOUR
SPECIAL BUSHING REQUIREMENT, ECONOMY BUSHING CAN SUPPLY IT! |
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TECHNICAL CONSIDERATIONS
HARDNESS
High grade steels selected for Economy bushings are unusually wear resistant. A Rockwell C
hardness of 58-62 is maintained in the bore. Rockwell C hardness of tungsten carbide is
78-80.
GRINDING STOCK
The outside diameter of press fit and liner bushings is finish-
ground to the press fit size indicated in this catalog. Oversize (.015") O.D.
bushings are available for fitting so that your shop can maintain its standard press fit
limits. Bushings available with oversize grinding stock are "PU,"
"HU," "LU," and "HLU" types.
OTHER TOLERANCES
All tolerances not specified for head diameters are
+/- .015 and for lengths +/- .010. Special tolerances for any dimension are available upon
request as a special bushing.
BORE TOLERANCE
Standard bushings have the following oversize
tolerance:
BORE
TOLERANCE
| DRILL SIZE |
I.D. TOLERANCE (OVERSIZE) |
| .0135 - .2500 |
+.0001 to
+.0004 |
| .2510 - .7500 |
+.0001 to
+.0005 |
| .7510 - 1.500 |
+.0002 to
+.0006 |
| 1.5010 - Up |
+.0003 to
+.0007 |
REAMER
TOLERANCE
| REAMER SIZE |
I.D. TOLERANCE OVER BASIC SIZE |
| Up to
1/4" |
+.0005 to
+.0008 |
| 1/4" to
1" |
+.0006 to
+.0010 |
| Over 1" |
+.0008 to
+.0012 |
CONCENTRICITY
All finish-ground bushings with 1/8" to 1/2" I.D.
are manufactured to .0003 T.I.R. at exit end. All other I.D. sizes are .0005 T.I.R. at
exit end.
IDENTIFYING ANSI STANDARD BUSHINGS |
P |
64 |
12 |
| Type of Bushing |
O.D. |
Length |
P = Headless Press Fit
H = Head Press Fit
R or XF = Fixed Renewable
R or SF = Slip Fixed Renewable
L = Headless Liner
HL = Head Liner |
O.D.
in 64ths of one inch
(i.e. "64" equals 1 inch) |
Length
in 16ths of an inch
(i.e. "12" equals 3/4 inch) |
Economy Bushing Co.
| Economy Power Trans.
How to Select the RIGHT
Bushing | Bushing Catalog
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