10
MOUNTING CHUCK ON LATHE
There are two versions of the SuperNova
2
Chuck: an insert version for all threads up to 27mm (1
1/8”) and threaded versions for dedicated threads up to 38mm (1 1/2”).
CORRECT MOUNTING OF CHUCK TO INSERT (WITH INSERT VERSION) AND LATHE
SPINDLE IS VERY IMPORTANT TO ACHIEVE ACCURACY.
INSERT VERSION:
Check that the correct insert has been supplied to match your lathe spindle
thread. The code of the insert is on a label on the plastic insert cover and stamped on one of the
flats of the hexagon section of the insert.
A list of thread sizes that can be fitted with an insert plus the larger dedicated threads is provided
below. If you find your lathe thread is not listed, check with your supplier (or www.teknatool.com)
to see if there have been more recent additions to the thread range. Failing that, you may have a
blank insert or blank chuck machined to your requirements at an engineering shop in your area.
WE STRONGLY RECOMMEND THAT THE CHUCK IS NOT USED ON LATHE SPINDLES
UNDER 16mm (5/8”).
Threads covered by the Insert System (Threads up to 28mm (1 1/8”)
Insert 2 (12NS) : M20 X 2 Tyme Cub
Insert 3 (13NS) : M20 x 1.5 Electra Beckum Multico Sumaro
Insert 5 (15NS) : 3/4” 16TPI UNF RH 1/8” spigot
Insert 6 (I6NS) : 3/4” Plain Bore
Insert 7 (I7NS) : 1 1/8” UN RH
Insert 8 (18NS) : 7/8” 12 UN Left-hand
Insert 9 (19NS) : 3/4” 16TPI UNF RH 6mm register
Insert A (IANS) : 3/4” 14TPI BSP RH Teknatool (Pre 1986)
Insert B (IBNS) : 3/4” 14TPI BSP LH Teknatool (Pre 1986)
Insert C (ICNS) : 1” 10 TPI BSF PH Teknatool Woodfast Durden
Insert D (IDNS) : 1 8TPI UNC RH General Rockwell Delta Golding
Insert E (IEN
S) : 1 1/4” 12TPI RH Myford MLS
Insert G (IGNS) : 3/4” 16TPI UNF RH Sears Coronet Minor/Minor
Insert H (IHNS) : 3/4” IOTPI BSW PH Rockwell Homecraft
Insert I (HNS) : M24 x 3 RH B Line Arundel K600 K450
Insert J (IJNS) : 1 1/8” 12TPI RH Myford Mystro
Insert K (IKNS) : M18 x 2.5 ELU DB180
Insert L (ILNS) : 1 1/4” 8TPI UNS RH (for DVR lathes with this thread only)
Insert M (IMNS) : 1” 10 TPI BSF LH Teknatool Woodfast Durden
Insert N (INNS) : Blank. Can be threaded up to 28mm (1 1/8”)
Insert O (IONS) : 1 1/U” BSW PH Morton
Insert Q (IONS) : M30 x 3.5 RH Teknatool Nova 3000 / Cornet / TL 1500 Woodfast, Vicmarc
Insert S (ISNS) 5/5” Plain Bore for Shopsmith Machines
Insert T (ITNS) : 1” 8 TPI LH/RH Dual Threaded, Nova Mercury
Insert U (1UNS) : 1 1/8” UNF RH Taiwanese
Insert V (IVNS) : 7/8” 14TPI NF RH
Insert W (IWNS) : M25x2 RH Tyme Avon
Insert Y (IYNS) : 1 1/4” 8TPI UNS Teknatool Nova 3000/Comet (USA), Woodfast USA
Threads Direct to Chuck Body (cannot be changed once cut)
M33x3.5 RH
Blank. For threads up to 38mm
FITTING TO CHUCK:
Check that the internal spigot of chuck body plus insert threads are clean and that the spigot end
of the insert is free from damage. Any dents or nicks must be carefully filed off so the insert can
be fully screwed home in chuck body. Refer to FIGURE 2. The tolerances of the chuck body and
insert are a tight fit to ensure accuracy. This means that the insert may be difficult at first to
engage with the chuck body thread. One way is to grip the chuck body in a vice (pad against
