R-8 tooling is readily available.
An extra 5C collet holder modified with
an oak insert to hold R-8 sized shanks.
R-8 Collets
Lyndex (Japan) R-8 collet set 1/8" x 7/8" x 1/16";
very accurate & high gripping power.
R-8
Spindle Accessories
Last updated on
Tuesday, September 19, 2023 03:59:28 PM
Mountain US Time Zone
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R-8 Collets,
ER-40 Collet
Chuck,
Arbor,
Boring Heads,
Fly Cutter,
End Mill Holders,
Drill Chucks
R-8 tooling
is readily available.
An extra 5C collet holder modified
with
an oak insert
to hold R-8
sized
shanks.
R-8 Collets
Lyndex (Japan) R-8
collet set
1/8" x 7/8" x 1/16";
very accurate & high
gripping power.
A rotary
collet holder is compact.
An ultra-high
precision (Maritool USA) ER-40 collet
chuck
with R-8 shank for
RF-25 mill use. Best in class.
Made from alloy steel hardened to 54 - 56RC, balanced
to 15,000 RPM, its concentricity is less than 0.0001"
at the collet's face & the rear
internal thread is 7/16-20.
This chuck type allows use of odd shank sizes of
drills
& end mills with only one collet system.
The ER-40
collets & clamping nut can be changed-out within a
smaller space than
the longer R-8 collets.
There are
other types of ER-40 collet chucks, e.g.,
MT3 shank.
ER-40 collet nut wrench.
Set of ER-40 collets (import) that provides
continuous sizes from
0.12" to 1.02"
Each size has a labeled filler plug that is used when
gripping short parts so as to not
distort the collet.
| ER-40 COLLET SIZES | ||
| COLLET SIZE | DECIMAL EQUIVALENT |
WORKING RANGE |
| 1/8" | 0.12500 | 0.120~0.160" |
| 3/16" | 0.18750 | 0.160~0.200" |
| 7/32" | 0.21875 | 0.200~0.236" |
| 1/4" | 0.25000 | 0.236~0.275" |
| 5/16" | 0.31250 | 0.275~0.316" |
| 11/32" | 0.34375 | 0.316~0.354" |
| 3/8" | 0.37500 | 0.354~0.393" |
| 13/32" | 0.40625 | 0.393~0.433" |
| 7/16" | 0.43750 | 0.433~0.472" |
| 1/2" | 0.50000 | 0.472~0.511" |
| 17/32" | 0.53125 | 0.511~0.551" |
| 9/16" | 0.56250 | 0.551~0.590" |
| 5/8" | 0.62500 | 0.590~0.629" |
| 21/32" | 0.65625 | 0.629~0.669" |
| 11/16" | 0.68750 | 0.669~0.708" |
| 3/4" | 0.75000 | 0.708~0.748" |
| 25/32" | 0.78125 | 0.748~0.787" |
| 13/16" | 0.81250 | 0.787~0.826" |
| 27/32" | 0.84375 | 0.826~0.866" |
| 7/8" | 0.87500 | 0.866~0.905" |
| 15/16" | 0.93750 | 0.905~0.944" |
| 31/32" | 0.96875 | 0.944~0.984" |
| 1" | 1.00000 | 0.984~1.020" |
Cannot measure error using a 0.0005" resolution indicator.
The chuck body
has flats for a 1-3/4" open-end wrench.
See
Precision Mensuration
Section
Super low runout. Measured +/-0.00015" or 0.0003"
total indicated readout
(TIR); within dowel-pin error.
Arbor
One-inch arbor
with an
R-8 shank
with various
spacers & left-hand nut.
Slit-cutting soft steel.
Boring Heads
Two-inch
boring head with
7/8-20
threaded
interchangeable arbors
MT2,
R-8, & 1/2" straight
type shanks.
Uses 1/2"
boring bars.
Steel boring-bar adapter
1/2" to 3/8". Used a reamer for the
3/8" hole.
Also, see how to use a
boring
head in a lathe tailstock for turning tapers.
The ID is measured using a self-centering
telescopic gauge
with a caliper or a
micrometer.
Two-inch boring head animation.
This boring head type's dial reads radius so the
diameter of
the hole increases by twice the adjusted size.
A 2-1/2" boring head
that
uses 1/2" boring bars.
The head has
a
rigid, integral R-8 shank
&
a direct-read dial so the diameter of the hole
increases exactly by the adjusted size (USA).
Multiple hole positions, with set
screws, for a 1/2"
boring-bar shank.
Again, this scale reads out the diameter changes;
some
are the radius. Note the adjustable gib dovetail.
A 3-inch boring head with
1-1/2-18
threaded interchangeable 3/4" & R-8 shanks.
The 3-inch boring head uses
boring bars with 3/4" shanks.
Mounted in the Rong-Fu mill using the R-8 shank.
A comparison of 2, 2-1/2, & 3-inch boring heads.
Fly Cutter
2-1/2" carbide fly cutter (supplied).
End Mill Holders
R-8 to MT2 adapter.
R-8 end mill holders.
Sizes: 3/16", 3/8", 1/2",
5/8" & 3/4".
Indexed end mills will not slip.
Jacobs ball bearing
Super Chuck,
1/8"
~ 5/8" (3mm ~ 16mm)
capacity
with R-8 to JT3 ETM
Precision arbor (Israel).
Large size shown relative to a US quarter (0.955" or 24.26mm).
Jacobs Super Chuck mounted
on the
RF-25 Mill
& turning.
Keyless 1/2" capacity drill chuck on R-8
shank.
Use
low-cost chucks for light duty work, only.
R-8 Collets,
ER-40 Collet
Chuck,
Arbor,
Boring Heads,
Fly Cutter,
End Mill Holders,
Drill Chucks
