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 ⅛" x ⅞" x 1/16"; very accurate & high gripping power.
R-8
Spindle Accessories
Last updated on
Monday, July 18, 2016 09:22:51 PM
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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
⅛" x ⅞" x 1/16"; very accurate & high
gripping power.
A rotary
collet holder is compact.
Click on linked thumbnails
Click on linked thumbnails
Click on linked thumbnails
ER-40
Collet Chuck
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 |
| ⅛” | 0.12500 | 0.12 ~ 0.16" |
| 3/16” | 0.18750 | 0.16 ~ 0.20" |
| 7/32” | 0.21875 | 0.20 ~ 0.236" |
| ¼” | 0.25000 | 0.236 ~ 0.275" |
| 5/16” | 0.31250 | 0.275 ~ 0.316" |
| 11/32” | 0.34375 | 0.316 ~ 0.354" |
| ⅜” | 0.37500 | 0.354 ~ 0.393" |
| 13/32” | 0.40625 | 0.393 ~ 0.433" |
| 7/16” | 0.43750 | 0.433 ~ 0.472" |
| ½” | 0.50000 | 0.472 ~ 0.511" |
| 17/32” | 0.53125 | 0.511 ~ 0.551" |
| 9/16” | 0.56250 | 0.551 ~ 0.590" |
| ⅝” | 0.62500 | 0.590 ~ 0.629" |
| 21/32” | 0.65625 | 0.629 ~ 0.669" |
| 11/16” | 0.68750 | 0.669 ~ 0.708" |
| ¾” | 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" |
| ⅞” | 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 1¾" open-end wrench.
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 ⅞-20
threaded interchangeable arbors
MT2,
R-8, & ½" straight type shanks.
Uses ½"
boring bars. Steel boring-bar adapter ½" to ⅜". Used a reamer for the ⅜" 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 gage
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 2½" boring head that
uses ½" 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 setscrews, for a ½"
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
1½-18 threaded interchangeable ¾" & R-8 shanks.
The 3-inch boring head uses boring bars with ¾" shanks.
Mounted in the Rong-Fu mill using the R-8 shank.
A comparison of 2, 2½, & 3-inch boring heads.
Fly Cutter
2½" carbide fly cutter (supplied).
End Mill Holders
R-8 to MT2 adapter.
R-8 end mill holders. Sizes: 3/16", ⅜", ½",
⅝" & ¾". Indexed end mills will not slip.
Jacobs ball bearing Super Chuck, ⅛"
~ ⅝" (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 ½" capacity drill chuck on R-8
shank. Use only for light duty work.
Click on linked thumbnails
R-8 Collets, ER-40 Collet Chuck, Arbor, Boring Heads, Fly Cutter, End Mill Holders, Drill Chucks
