R8 Spindle Accessories
R-8 tooling is readily available.
This is an extra 5C collet holder modified with an oak insert
to hold R-8 sized shanks.
An ultra-high
precision (Maritool USA) ER-40 collet chuck
with R8 shank for RF-25 mill use.
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 allows use of multiple shank sizes of
drills, end mills, reamers, & fly cutters with only one collet system.
The ER-40 collets & clamping nut can be changed out within a smaller space than
the longer R8 collets.
Flats for using an 1¾" open-end wrench.
There are other types of ER-40 collet chucks, e.g.,
MT-3 shank.
ER-40 collet nut wrench.
Set of ER-40 collets (import) that provides
continuous sizes from
0.12" to 1.02"
The sized filler plugs allow gripping short parts without distorting the collet.
Can not measure using a 0.0005" resolution indicator.
Super low run out. Measured 0.0003" total indicated readout (TIR) or
±0.00015"
One inch arbor on R-8 shank with various
spacers & left-hand nut. See
saw blades.
Two-inch boring head with interchangeable
MT-2,
R-8, & ½" straight type shanks. Uses ½"
boring bars.
Steel boring-bar adapter ½" to ⅜". Used a reamer for the ⅜" hole.
2½" boring head with (rigid) integral R-8 shank
uses ½" boring bars. Direct-read dial.
2½" carbide fly cutter (supplied).
Lyndex (Japan)
collet set; very accurate, high
gripping power.
A rotary collet holder is nice.
R8 to MT-2 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 JT-3 ETM
Precision arbor (Israel).
Large size shown relative to a US Ohio quarter.
The large chuck mounted on the RF-25 Mill
& turning.
Keyless ½" capacity drill chuck on R-8
shank. Use only for light duty work.