Archive for June, 2012

Your Source for Automatic Drills, Multiple Spindle Heads, and more

Recommended Drill Head Pressure

RecommendedDrillHeadPressureChart.pdf

Recommended Drill Head Pressure

HK Diamond Core Drill Bits Material Recommended Drill Head Pressure (lbs.)*
Fiberglass 10 to 15 lbs.
Limestone & Marble Stone 12 to 18 lbs.
Glass, Ceramic & Porcelain China 12 to 18 lbs.
Ceramic/Porcelain Wall Tile 15 to 20 lbs.
Stone Style Porcelain Floor Tile 18 to 30 lbs.
Granite Stone 18 to 30 lbs.

*WARNING:  Drill press arms leverage hand pressure by a factor of about 6 to 8.  So 2 lbs. of hand pressure on the drill press arm will apply about 14 lbs. of pressure to the drill head.

If a drill bit develops yellow, brown, blue or black ‘burn marks’ around the tip, it is an indication of extreme heat caused by the excessive drill speed or by too much pressure on the drill.  Impact type “hammer drills” should never be used with diamond drills as they have no benefit and will cause the tip of the bit to mushroom or split.

If a hole is being drilled completely through a piece of material, it is also important to “lighten up” considerably on the pressure when the drill bit is near the back of the material.  This reduces chipping or fracturing on the back of the material when the bit emerges from the back. Using a similar “backer” material may also help prevent accidental and damaging breakthroughs.

Hardness Scale Chart

HardnessScaleChart.pdf

Knoop
Hardness Scale

Material
Wood – Pine 10
Copper 120
Limestone 125 – 150
Marble 140 – 180
Slate 140 – 250
Porcelain Fixtures & China 400 – 500
Glass & Ceramic 400 – 550
Ceramic Wall Tile 450 – 550
Porcelain Wall Tile 500 – 650
Porcelain Floor Tile 500 – 650
Marble Style Porcelain Floor Tile 500 – 650
Granite Style Porcelain Floor Tile 500 – 650
Granite 550 – 650
Quartz 820
Common Tool Steel 700 – 900
Tungsten Carbide 2,000
Diamond 7,000

Random and Useless Scientific Conversions

RandomScientificCalculationsChart.pdf

Random and Useless Scientific Conversions
Ratio of an igloo’s circumference to its diameter = Eskimo Pi
2000 pounds of Chinese soup = Won ton
1 millionth of a mouthwash = 1 microscope
Time between slipping on a peel and smacking the pavement = 1 bananosecond
Weight an evangelist carries with God = 1 billigram
Time it takes to sail 220 yards at 1 nautical mile per hour = Knotfurlong
16.5 feet in the Twilight Zone = 1 Rod Sterling
Half of a large intestine = 1 semicolon
1,000,000 aches = 1 megahurtz
Basic unit of laryngitis = 1 hoarsepower
Shortest distance between two jokes = A straight line
453.6 graham crackers = 1 pound cake
1 million-million microphones = 1 megaphone
2 million bicycles = 2 megacycles
365.25 days = 1 unicycle
2000 mockingbirds = 2 kilomockingbirds
52 cards = 1 decacards
1 kilogram of falling figs = 1 FigNewton
1000 milliliters of wet socks = 1 literhosen
1 millionth of a fish = 1 microfiche
1 trillion pins = 1 terrapin
10 rations = 1 decoration
100 rations = 1 C-ration
2 monograms = 1 diagram
4 nickels = 2 paradigms
2.4 statute miles of intravenous surgical tubing at Yale University Hospital = 1 IV League
1 mouthful of dirt = 1 terabyte (from Sage!)