A Generic Manual & Parts List is available for this machine
Typical of the generic Taiwanese "Mill/Drill" as made from the early 1970s and marketed by various companies world-wide including, in the UK, Sealey, Warco, Whitecote, Excel and Ajax, the example branded "Naerok" (Korean written backwards) was certainly the best of the bunch. Its table, at 20" x 6.25" was unusually large with a longitudinal travel of 12.75" and in traverse of 5.5 inches. Satin-chrome-plated, zeroing micrometer dials were fitted at both ends of the table's longitudinal feed screw, these being engraved with divisions of 0.001",High-resolution pictures - may take time to open
The entire head assembly was elevated by a bevel gearbox at the bottom of the column, this playing in important part in the usefulness of the machine for, instead of the head being able to swing freely from side to side when the clamping bolts were slackened, on the Naerok the alignment was maintained through the whole vertical travel.
In addition to the elevating head, the quill, which held a No. 3 Morse taper spindle, could be moved through a travel of 3.5 inches by either a handwheel fine-feed control (working through worm-and-wheel gearing with each division on the micrometer dial being 0.002") or by a 3-spoke, quick-action capstan handle. Power came from a rear-mounted, 1-phase 3/4 h.p. motor (other makes generally being fitted with ones between 1/2 and 1.5 h.p.) with drive by an "A" section V-belt from a 3-step on the motor to an intermediate, self-aligning, 4-step jockey pulley and then to a 4-step front pulley, the arrangement giving 12 speeds that spanned a most useful 90 to 2150 r.p.m. (other makes often had a higher bottom speed of 200 r.p.m. or so, together with a higher top speed of 2500 r.p.m. making them handy for drilling and milling with small-diameter cutters - but less so for tapping). A word of warning, for the maker's supplied spindle-speed figures for these millers are often slightly out.
A further advantage of the Naerok was the availability of a very useful, infinitely-variable, auto-knock-off power longitudinal feed to the table. The unit was a third-party, Taiwanese-built type that was also offered for retro-fitting to other small milling machines and came with a very large, satin-chrome plated, clearly-engraved inch-division micrometer dial locked by an "non-upset" face-locking ring.
Although inexpensive, of relatively crude construction and with a less-than-perfect cosmetic finish, this type of mill/drill is a most useful addition to any workshop. Able to mill to tolerable accuracy with either large or small cutters, it becomes additionally handy when used as a coordinate drill - the vice being bolted securely to the table and the slides then manoeuvred so as to bring the workpiece exactly into the required location beneath the drill bit.