R-8 Spindle Accessories
Last updated on Sunday, September 07, 2014 05:48:05 AM Eastern US Time Zone

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R-8 Collets, ER-40 Collet Chuck, Arbor, Boring Heads, Fly Cutter, End Mill Holders, Drill Chucks

RF_R-8_accessories.jpg (54427 bytes)
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.

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

0.12500 0.12 ~ 0.16"
3/16” 0.18750 0.16 ~ 0.20"
7/32” 0.21875 0.20 ~ 0.236"
0.25000 0.236 ~ 0.275"
5/16” 0.31250 0.275 ~ 0.316"
11/32” 0.34375 0.316 ~ 0.354"
0.37500 0.354 ~ 0.393"
13/32” 0.40625 0.393 ~ 0.433"
7/16” 0.43750 0.433 ~ 0.472"
0.50000 0.472 ~ 0.511"
17/32” 0.53125 0.511 ~ 0.551"
9/16” 0.56250 0.551 ~ 0.590"
0.62500 0.590 ~ 0.629"
21/32” 0.65625 0.629 ~ 0.669"
11/16” 0.68750 0.669 ~ 0.708"
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"
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" 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, & " straight type shanks.
Uses " boring bars. Steel boring-bar adapter " 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 2" boring head that uses " 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 " 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 1-18 threaded interchangeable " & R-8 shanks.


The 3-inch boring head uses boring bars with " shanks.


Mounted in the Rong-Fu mill using the R-8 shank.


A comparison of 2, 2, & 3-inch boring heads.

Fly Cutter


2" carbide fly cutter (supplied).

End Mill Holders

R-8 to MT2 adapter. R-8 end mill holders. Sizes: 3/16", ⅜", ", ⅝" & ". Indexed end mills will not slip.

Drill Chucks

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 " capacity drill chuck on R-8 shank. Use only for light duty work.

R-8 Collets, ER-40 Collet Chuck, Arbor, Boring Heads, Fly Cutter, End Mill Holders, Drill Chucks

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