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Tom Senior "Junior"

Instruction Books and Catalogues are available for the Senior range

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Although specially designed for model and experimental shops - and sometimes employed for instructional use in schools and colleges - the "Junior" was made to Senior's usual, exacting and high-quality standards. Sized at 20" x 4.75" with a longitudinal travel of 10", in traverse of 4.5" and vertically 10", the table was a useful size and carried two T-slots. An as optional extra (£481 in 1981) power feed to the table could be proved; this had three rates of feed, the gearbox being driven directly from a V-belt extension on the main spindle motor and the whole assembly properly engineered with the drive mechanism inside the saddle oil-bath lubricated and a sight-glass window provided to check the level.
Impressively, the Timken taper roller bearing spindle had 12 speeds from 60 to 4000 RPM, for the miller retained the heavy-duty lathe-like "backgear" assembly within the main column body fitted to the larger models. This valuable feature enabled it to mount slab milling cutters in the horizontal mode, yet run fast enough to make the best use of smaller end mills and slot drills when stub milling directly from the horizontal spindle nose. However, it might be, that like some other Senior models, when supplied for training purposes or school use, the backgear was sometimes omitted to lower the price - so it's worth checking that this useful feature if present before driving 400 miles to view one….
Like other millers in the maker's range, early versions of the "Junior" had the electric motor mounted on top of the main column making it relatively easy to change - or adapt almost anything not too large to replace it. Later models had the motor inside the cabinet stand and, although this type retained the twelve spindle speeds, the range was compressed to 50 - 2800 r.p.m.
Stripped of its horizontal spindle and backgear assembly, and fitted with an S-Type self-contained, swivelling vertical head (with both fine and rapid quill feeds), the Junior was sold as the "
Light vertical", a useful miniature style of  "ram-head" machine. Although the standard vertical head supplied for the Junior was a simple swivelling - but non-quill feed type at £292 extra, occasionally one might come across a full-fat Junior complete with an S-Type head (an additional £605 with a single-phase motor) making this a most desirable machine.
Standing 5 feet high ((1.5m) and with a chip tray measuring 29" x 22" (737 mm x 559 mm), when new, as a high-quality product, the Junior was an expensive machine, the list price for a basic machine in 1981 being £1790 plus VAT. Adding table power feed, the simple, non-quill-feed vertical head and coolant raised this to £2758 and with an S-type head in place of the basic type, £3071. During 2019 well-equipped Juniors in decant order made prices varying from £1350 to £2250.

The maker's rather inadequate catalogue picture of a "Junior"

The table's power-feed mechanism was oil-bath lubricated - note the oil-level sight-glass window on the front face of the saddle

A Junior fitted with what might be a home-constructed vertical head known as the "Anderson"

Top right - the maker's slotting head

Instruction Books and Catalogues are available for the Senior range

Senior Home Page   Senior Lathes   Senior Shapers & Planers
 
Prices  E Type   Junior Horizontal/Vertical   Light Vertical
   
VS   Major ELT   Older Senior Millers

Tom Senior "Junior"