Sometimes
I meet up with and old mechanic mate of mine, who despite not being at all
academic, was the most competent mechanic I’ve had fix machinery. Back in the
1960’s we made progress without following rule and regulations, and he
reflected how drivers used to reverse large, loaded trucks, which led me to
this. My mate was into Caterpillar machinery.
Cat
D6 Dozer
We
had Cat D6 dozer on the forest, and while Mick was the driver, I’d spent a few long
days on the old girl too. Mick and I put in many of the roads on the forest,
although my role was doing the survey work and sorting out the culverts, and
keeping an eye out for problems along the way. I used to survey and plot onto
chats all the work we did on the forest, roads and compartments mainly…
compartments being the areas planted in a given year. To do all of that, I used
army surplus prismatic compass, abney level and chain, all bound in leather
cases… and my trusty survey book.
I
didn’t pre-survey the road, batters or cut and fills before we did any dozer
work, I was a rule of thumb fellow. If there was a hill we had to descend,
which was most often, I used to go to the other side of the gulley and using
the abney level side on (usually, you peer through it lining the crosshair with
the target, and move the spirit level to level and read off the degrees); side
on you line the body of the level where you want the road to go, set the spirit
level and read off the degrees. Twelve degrees is the comfortable slope for a
logging truck but some pinches ten was ok-ish. Of course, less than twelve
degrees was even better… but on short ridges you have to compromise.
I
would then go to the roadline and flag it with survey cloth, which was nothing
but white linen that I’d ripped into inch wide strips. Using my Abney level set
on the degrees selected, I would flag the line at the top of the cut, or batter,
for Mick to follow. But on one particular line, I struck a problem. It was a
south-lying face and covered with tall native scrub, so visibility was a bit of
a challenge. Half way down, smack in the middle of the roadline was a massive
Totara tree, around six feet in diameter. Of course I could have cut it down,
and blown the stump to bits; Totara is a stately tree but it was defoliating,
so near the end of its life… saying that is relative, because it could hang on
for another hundred years. Old Bert my mate, co-debater and sparring partner happened
to be with me in case I needed a slasher, he said, ‘Y’know, this tree saw Captain sail
by.’ That was enough for me, the tree was going to stay!
It was just a matter of undoing the work I had done, which was a day’s work, and had the
choice of a chain or so above the tree, or a chain below it; I chose the former
because it made for a better crossing in the creek where we would need a
three-foot culvert… and the fill to cover it. The cut was on the right-hand
side of the dozer, which is the side of the hydraulic blade lever and it’s
natural that Mick wasn’t watching the left-hand side as much, so he tended to
make the road a bit narrower. Especially on steep land, but where native scrub
is growing, I didn’t like stripping the vegetation off, but I wanted the whole carriageway
to be on solid, not fill. If it was on fill, fifty years hence, the scrub rots
and the road slumps.
About
every chain (22 yards) we put in one-foot culvers to stop the water table
scouring deeply, I’d just spend a day’s culvert placement with three guys,
their shovels and a crowbar after Mick had done his best with the dozer digging
out the bed. Another problem surfaced, getting towards the gulley, Mick struck
blue rock… most of the rock was either red metamorphosed sandstone, or ‘rotten’
schist. The schist wasn’t rotten at all but is just younger, weak, yellow so
fractured easily. The blue rock is still schist but baked a bit more and hard
as the hobs of hell! The dozer had a winch, not rippers so we had to blast the
rock. I had a Shot-firer’s ticket so that was my job too.
The
compressor had an old Vanguard motor, and no battery, so we cranked it to
start, and always it started well even after sitting unused for months. It was
on a single axel, making it a challenge to back it down the hill with the Commer
truck. She had a canopy on the back to transport men, so there was no
visibility and the mirrors were small. She had a running board so I did what
the old lorry drivers used to do. I stood on the running board (step) with one
foot, (door open) and the other on either the brake or the accelerator. One
hand on the steering wheel, and the hard part was, there was no power steering!
I only had to go forward a couple of times to reset, which wasn’t bad. When my Dad’s
Ford truck had a full load of milk crates, that’s how we backed it too.
Mick
and I spent a week on the jackhammer drilling the holes about a yard apart and
some a couple of yards deep. A dusty job, because the cutting tip was tungsten
in the shape of a cross with a hole in the middle, the jackhammer would ump the
drill up and down five times and then do a quarter of a turn, after a bit, move
the lever to stop the jumping and force compressed air to drive the dust up and
out of the hole. We had a magazine for storing the gelignite and cortex
detonating fuse, and we kept the detonators, and safety fuse in the storeroom
cupboard, but I needed to order another six of cases of gelignite for a rock
bluff on the other side of the gulley. I usually put one plug in each hole,
joined them all with cortex and attached a detonator to the safety fuse and
taped the det to the cortex, which makes it all go bang at once.
Instantaneously.
Cortex
is a manganese fuse, and I found it best to tape it in the direction of the
flow fron the det. Some people tie it, but it’s useful because it makes each
stick go off at once. To shorten a concrete culvert pipe, three wraps of it around
the pipe, will just disintegrate that piece of that pipe and leaves the
reinforcing to be cut with bolt cutters. We even used it to blow the tops out
of trees to make a logging spar. The safety fuse has gunpowder in the middle
but it didn’t light easily for safety reasons, so you cut the fuse diagonally,
placed the matchhead on the gunpowder and strike the matchbox against it. I had
a wisdom tooth removed and a detonator fitted in there nicely, so that’s how I
crimped the fuse to the det. It isn’t particularly dangerous… the explosive bit
is at the very end, and the rest is a tube that the fuse fits into, so the boom
bit was outside my mouth and I just chomped on the soft bit and it worked like
a charm.
The
rock bluff turned out to be quite a mission, because at the start we could only
blow a dozer-blade full, because there was nowhere for the dozer to ‘stand’ but
after clearing the rest, the last blow was two cases on a flat ‘paddock’ of
rock, and up she went. We just had to lower it by about a yard. Those days, we
had no safety equipment, helmets, earmuffs (no wonder I’m deaf) goggles or
gloves. We needed access, so we just poked the road through with the gear we
had.
As
a team we used to work hard, but there was a certain joy in doing it, and there’s
the difference to today… regulation stifles us.