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3/8" Endmill and Cutter Holder

Tools with 3/8" diameter shanks are fairly common, but too large to pass into the headstock spindle on my lathe.  I usually use smaller diameter tools when available, but decided to make a holder with a B-8 type of shank to fit the collet holding headstock and bored to fit 3/8" tooling.  This ends up being fairly long and therefore not  very rigid, but has useful on various occasions.


The arbor was started from 3/4" mild steel rod (type 12L14).  The steady rest is used to support the rod for facing each end and center drilling for tailstock center support.


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A 40mm length is turned to 14mm. 
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Next, a 27mm length is turned to 8.0mm.

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The end is turned down to be threaded B8 (6.82mmx0.625).
The 20 degree head taper is turned with the compound slide.

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The B-8 die is held in the die holder and the arbor threaded.

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The work was too long to mill the keyway while mounted in the headstock.  So it was setup in the milling vice and centered with the micrometer.

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A 2mm endmill was used to form the keyway.

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The arbor is mounted in the headstock and secured with the drawbar.  With tailstock support, the diameter is reduced to true it and provide a clean surface.

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The arbor was drilled 5.3mm for a length of 40mm.

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This hole is then bored open to 9.525mm (3/8").  A boring bar of sufficent length is required, this is an Accupro 1801500 (0.180" minimum bore diameter & 1.500" maximum bore length).  The boring is checked until a snug fit is achieved.

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The work is transferred to the dividing head to cross drill (5mm) the securing screw hole.  This was located 17.5 mm from the end. 
 
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The hole is tapped M6x1.0, and a socket set screw is used (M6 x 6mm length).

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The arbor was intended for use with 3/8" shank mills.  Shown are a couple of Whitney cutters, a 60 degree dovetail cutter and a 90 degree double angle cutter.

Whitney Tools - Dovetail Cutters
File Size: 2146 kb
File Type: pdf
Download File

Whitney Tools - Double Angle Cutters
File Size: 2146 kb
File Type: pdf
Download File

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1/8" Endmill Holder

A similar type of endmill holder was made for 1/8" shanks.  This size tooling does not typically have a locking flat, so I am simple adding a couple extra screws to secure the endmill in the holder.  This did lead to some runout in the endmill and may be better to have 3 or 4 opposing screws to help center the endmill in the holder, so I may modify what is shown below.


A collet type shank was machined on the end of a length of 1/2" cold roll steel rod (12L14).  This was the longest part of the project, but is summarized in the one photo below.  After mounting in the headstock with a drawbar, the reverse end was faced, turned true, drilled 2.5mm, reamed 1/8", countersunk, and chamfered 30 degrees.  It was then moved to the dividing head to drill 3.3mm holes, which were then tapped M4 to fit some M4 x 4mm stainless steel screws I had on hand. 

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