9x20 Lathe Mandrels & Arbors

9x20 Lathe Mandrels & Arbors
Last updated on Friday, March 31, 2023 05:24:05 PM Mountain US Time Zone

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Continuous size range from 1/2" to 2" inside diameter (ID).
Numbered on the flats, 1 through 8, shown bottom to top.
There are two parts per mandrel; a tapered arbor &
a matched flexible sleeve. The large end has a short,
straight shank allowing it to be mounded into a collet.
Both ends have been centered drilled to accomodate centers.
The flat can be clamped by a lathe dog & driven by a face-plate,
when turning between centers. Hardened & precision ground.

EXPANDING LATHE MANDREL SET SPECIFICATIONS
#	ID RANGE (in)	SHANK (in)	SLEEVE (in)	LENGTH (in)
1	1/2 ~ 9⁄16	1/2	2-1/2	5
2	9⁄16 ~ 21⁄32	19⁄32	2-3/4	6
3	21⁄32 ~ 3/4	21⁄32	2-3/4	6
4	3/4 ~ 7/8	3/4	3-1/4	7
5	7/8 ~ 1	7/8	3-1/4	7
6	1 ~ 1-1/4	1	4	9
7	1-1/4 ~ 1-1/2	1-1/4	4	9
8	1-1/2 ~ 2	1-1/2	5	11-1/2

#1 through 5 mandrels.

Mandrels #6, 7, & 8 have two sleeves each to
enable continuous coverage of their ranges.

End view of the largest, #8 sleeve.
The inside taper matches that of the arbor.

Using a Mandrel

An expanding mandrel shown mounted using a collet &
a live center. All of them can also be mounted
between centers & driven with a lathe dog.
Tighten & loosen by tapping on the sleeve with a hard
plastic-faced mallet. This part example has a non-standard
39/64 (0.6054" or 15.377mm) inside diameter.

Expanding Arbors

Eight expanding arbors 1/4" to 1-1/4".
Mount in the lathe, expand with the
screw, & then machine to size.

Tapered Lathe Mandrels

Small, tapered lathe mandrels in 1/8" to 15/32" by
1/32" sizes. Held between centers & driven with a dog.
Standard taper of 0.0005″ per inch with the size marked
at the larger end where a flat is provided for a lathe dog.
Made of hardened tool steel precision ground to size.