A contractor, Kiewit-Bilfinger Berger ( KBB ), used a tunnel-boring machine that was long and had a cutting head that was in diameter.
22.
The mining units use rotating cutting heads which are pulled along the exposed face of an underground coal seam to cut the coal.
23.
It consists of a cutting head at the end of a long shaft with a handle or handles and sometimes a shoulder strap.
24.
Then almost immediately there is a faint groove for about two revolutions while Charlie Nehlsen gently lowered the cutting head back to the disc.
25.
Water jets use approximately per minute ( depending on the cutting head's orifice size ), and the water can be recycled using a closed-loop system.
26.
For each pair of numbers the operators would move the cutting head to the indicated spot and then lower the tool to make the cut.
27.
Fabrication of structural steel by plasma and laser cutting introduces robots to move the cutting head in three dimensions around the material to be cut.
28.
The cutting head of English's TBM consisted of a conical drill bit behind which were a pair of opposing arms on which were mounted cutting discs.
29.
Later, the special half-speed cutting heads and equalization techniques were employed to get a wider frequency response in stereo with reduced distortion and greater headroom .)
30.
One side of the cutting head is about an inch wide, and the other side is less than a half inch and is used for detail trimming.
