 Bushings Toolholders
 Bushings
Introduction
Anti-friction rotary bushings are self contained
bearing cartridges used to support and guide rotating cutting tools. They consist of a
stationary outer case; a hardened and ground inner liner which rotates with the cutting
tool; anti-friction bearings and seals. They are manufactured in several series with each
having distinct advantages that cover the broadest range of metal working applications.
While available in a wide range of standard sizes, Gatco Rotary Bushings are commonly and
readily modified to suit individual requirements or specifications.
Specials
For those situations where a standard or modified
standard bushing is not suitable, our engineering department can provide a special design to suit your specific requirements.
Contact GATCO or use our Rotary Bushings,
Arbor Bushings
(tapered) or Arbor
Bushings (straight) form to fill
in and send your requirements for an immediate design and quotation.
Standard GATCO
Manufacturing Tolerances
Tolerances - Inside
Diameter
Standard manufacturing tolerances for inside diameter are as
follows:
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
| I.D. under
1.625" |
+.0003" to
+.0006" |
I.D. under 41.27 |
+0.007 to +0.015 |
| I.D.
1.625" and above |
+.0005"
to +.0010" |
I.D.
41.27 and above |
+0.013
to +0.025 |
| Runout |
.0005" T.I.R. |
Runout |
0.013 T.I.R. |
| (Closer
runout available on request) |
(Closer
runout available on request) |
| Finish |
12-20
µ inch |
Finish |
12-20
µ inch |
Tolerances
- Outside Diameter
Standard manufacturing tolerances for outside diameter are as
follows:
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
| Standard
O.D. grind |
+.0000"
to -.0005" |
Standard
O.D. grind |
+0.000 to
-0.013 |
| Std. O.D. grind for GB/GBM |
-.0002" to -.0004" |
Std. O.D. grind for GB/GBM |
-0.005 to -0.010 |
| Standard
O.D. stock |
+.020" |
Standard
O.D. stock |
+0.50 |
Note: All Bushings are provided standard with
.020" grind stock except GB, GBM, GNT and GNTM which are provided finished O.D.
ground.
O.D. grind available at additional charge. |
Note: All Bushings are provided standard with 0.50
grind stock except GB, GBM, GNT and GNTM which are provided finished O.D. ground.
O.D. grind available at additional charge. |
Recommended
Fitting Tolerance
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
Minimum Fit Between Tool O.D. and Bushing
I.D. |
| Under 1.625" = Tool |
O.D. +.0003" to
+.0006" |
Under 41.27 = Tool |
O.D. +0.007 to +0.015 |
| 1.625" and above =
Tool |
O.D. +.0005" to
+.0010" |
41.27 and above = Tool |
O.D. +0.013 to +0.025 |
Minimum Fit Between Housing Bore and Bushing
O.D. |
| Housing Bore = Bushing |
O.D. +.0000" to
+.0005" |
Housing Bore = Bushing |
O.D. +0.000 to +0.013 |
Toolholders
Introduction
Anti-friction rotary toolholders are a combination of a solid
toolholder with an exterior bearing assembly. They are far superior to solid toolholders
because they eliminate the friction and wear between the holder and the support bushing.
Due to their friction free bearing construction operating temperatures are lowered,
permitting higher speeds. Their compact construction allows for close center to center
distances and are used where space constraints do not allow a rotary bushing. Rotary
toolholders are commonly used to replace solid holders in existing machinery because they
can usually be incorporated requiring no modifications to the machine.
Specials
Special toolholders and modified standards can be designed for
specific applications. Rotary toolholders can be furnished with tapered shanks, special
O.D.’s, special lengths, etc.. In an effort to provide the metal working industry
with a wide selection of rotary toolholders Gatco, Inc. will design a toolholder to fit your
specific requirements. Contact GATCO or use our Rotary Toolholders form to fill in
and send your requirements for an immediate design and quotation.
Standard GATCO
Manufacturing Tolerances
Tolerances - Outside
Diameter
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
| Nominal O.D. |
+.0000" to
-.0005" |
Nominal O.D. |
+0.000 to -0.013 |
Tolerances
- Shank Diameter
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
| Nominal O.D. |
+.0000" to
-.0005" |
Nominal O.D. |
+0.000 to -0.013 |
Tolerances
- Socket Runout
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
| Runout |
.0005" T.I.R. |
Runout |
0.013 T.I.R. |
Note: Socket dimensions and
tolerances are based on the specific manufacturers specifications or standards. Contact
Gatco for socket specifications to fit your tool. |
Recommended
Fitting Tolerance
Description (inches) |
Tolerance (inches) |
Description (metric) |
Tolerance (metric) |
Outside Diameter |
| Bushing I.D. = Tool O.D. |
+.0003" to
+.0005" |
Bushing I.D. = Tool O.D. |
+0.007 to +0.013 |
Shank Diameter |
| Spindle I.D. = Shank O.D. |
+.0003 to +.0005 |
Spindle I.D. = Shank O.D. |
+0.007 to +0.013 |
Note: Special size and run out tolerances ( T.I.R.) for rotary bushings
and rotary toolholders are available on request. |
