Standard sizes in a given I.D. range are sizes listed in the Standard
Drill Size Chart (see Drill Size Chart) either as a fraction, number or letter
size. All other sizes are prices as specials.
Reamer Bushings
Standard Reamer Sizes
Tolerance
#80
1/4
Nominal +.0005 to +.0008
Over
1/4
1"
Nominal +.0006 to +.0010
Over
1"
Nominal +.0008 to +.0012
Specify type, size, and "reamer bushing"
Reamer bushings will be furnished with the proper clearance if the size is
given as a fraction, number or letter
If the size is given as a four-place decimal, our standard I.D. tolerance
will be used
Reamer bushings are priced as specials
Counterbores
Unless otherwise specified, all carbide bushings are supplied without
a counterbore
Carbide bushings with a counterbore are priced as specials
O.D. Tolerances (When not specified)
Any non-standard O.D. in a PC or HC will be given a +.0005/-.0000
tolerance
In a renewable style -.0003 will be given
Any tolerance to 50 millionths can be supplied. Please specify at time of
quote.
Concentricity
I.D.'s
Concentricity
Smaller than 1/8
.0005 (drill exit end)
1/8 to 1"
.0003
1" to 2-1/4
.0005
On counterbored bushings, tolerance is met at drill exit end.
They are made by blending micron-sized tungsten
and cobalt powders, then compacting the mixture in a mold and sintering the
molded part at a temperature high enough to cause the cobalt to flow. During
this process the cobalt fills the voids between the tungsten grains and
thoroughly coats each grain. When the cobalt solidifies, it "cements" the
grains together, forming a dense composite. Cemented carbides get their
hardness from the tungsten grains and their toughness from the tight bonds
produced by the cementing action of the cobalt metal. By varying the amount
of cobalt we can change the hardness, wear resistance and toughness (shock
resistance) of the carbide to suit your particular need.
A Subsidiary
of Yillik Precision Industries
