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Our Single Spindle Woodborer
is powered by a 5.5 hp Honda engine with a 2:1 gear
reduction and centrifugal clutch, or Yanmar diesel cam shaft
take-off (no clutch but has throttle cut-off). The whole
engine assembly is a complete mechanical drive system
rotating the drill spindle at a maximum speed of 1200 rpm.
The simple centrifugal clutch, spline and gear drive system
is robust and reliable despite its light weight.
Spindle feed distance is 250 mm, able to take the longest of
sleeper timber drill bits. Feed is achieved by pulling down
on a lever until the set depth is reached. Depths are easily
set with the aid of the 10 mm increments marked on the
chromed slide. Feed return is carried out by captive
external springs mounted on the lever system.
The bottom tube retains hardened drill guides which locate
the drill in the holes of a rail seat as well as keeping the
rotating drill safely shielded.
Best production rates are achieved using our own timber
sleeper drills which have tungsten carbide cutting edges and
specially formulated flutes and clearances. These new
features ensure that the drills do not become choked up with
cuttings (which breaks other brands of drills) providing
fast ejection of the cuttings and consequent very fast
drilling times of around 2 seconds per hole.
Tungsten carbide cutting edges are made from a robust grade
which is more resistant to the damage caused by rail
ballast. Of course, running the drill bit into ballast will
reduce the cutting edge life. The drill bits are
re-sharpenable and in addition can have the cutting edges
re-tipped with new carbides. This reduces the cost of the
next edges to half of a new drill, provided that the main
shank is able to be reclaimed.
These drill bits are between 3 and 4 times the cost of
ordinary sleeper drills, however, if the drills last 3 to 4
times longer then the economics are proven in extra
production. Fewer drill bit changes, fewer spare drills and
fewer sharpenings per day of drilling. In some severe
conditions, our sleeper drill has extended drill bit life by
as much as ten-fold and other applications in different
timbers, an even greater number of holes when compared to
standard sleeper drill bits.
The whole 74 kg assembly is mounted onto a push-a-long
trolley, which weights around 30 kg, complete with a light
tool tray for water bottles or operator "odds &
ends".
Just another innovative
product from Melvelle Engineering , manufactured right here
in Newcastle NSW, Australia. Buy Australian and buy world
class solutions to greater production.
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