Compare the Crawford Drill to the Village Drill and standard drills
Comparing the Village Drill to the Crawford Drills
The Crawford Hand Drills
One may make a comparison between the Village Drill and the Crawford Hand Drill and Crawford Small Engine Drill. The hand operated Village Drill costs 45 times as much as the Crawford Hand Drill and depends on a small gasoline powered water pump that is not dependable and is damaged easily by drilling fluid that is laden with sand. The village drill weighs 16 times as much as the Crawford hand drill and must be hauled in a heavy duty vehicle. The Village Drill cannot drill wet materials as efficiently as the Crawford Hand Drill because the Village Drill depends on a fluid pump that becomes highly inefficient as it penetrates deep into the sub-grade. The Crawford Hand Drill becomes more efficient as it penetrates deeper in the sub-grade because it does not depend on small inefficient water pumps for removal of spoil. The Crawford Hand Drill can drill in sand, silt, clay and gravel and the Village Drill cannot drill gravel efficiently. The Crawford Hand Drill can mobilize, drill a well and demobilize before the Village Drill can mobilize and set up to begin drilling. The Crawford Hand drill can drill with either PVC or Steel drill stem making it possible to control costs, while the Village Drill must use steel drill stem even when PVC drill stem would produce a more efficient system. The Crawford Hand Drill can be outfitted with a 2 inch, 3 inch, 4 inch, 6 inch or 8 inch drill stem. With the 6 inch or 8 inch drill stem a large air compressor and tripod are required but with this system one may drill through gravel as large as 4.5 inches by 9.5 inches, something no other hand drill in the world can do. The Village drill is complex to ship, assemble and dismantle, the 2 inch through 4 inch Crawford drills are easy to ship, easy to assemble and easy to dismantle.
The Crawford Small Engine Drills
The Crawford Small Engine Drills have all the advantages of the Crawford Hand Drills, plus they are mounted on a two wheel chassis and have small diesel power and hydraulic top drives. The Crawford Small Engine Drill can drill with either heavy duty PVC or steel drill stem. The Crawford Small Engine Drill is available with hand winches for lifting or hydraulic lifting and down pressure. These drills can be anchored to the sub-grade with helical anchors or other means enabling them to put high pressure on the drill bit. The Village Drill has no engine for turning the drill or lifting the drill stem. However, it depends on a gasoline or diesel powered pump. The circulation pump used by the Village Drill loses efficiency as it drills deeper in the sub-grade. The pump of the Village Drill must handle re-circulated drilling mud and is damaged easily by sand suspended in the drilling mud, making the Village Drill less reliable than the Crawford Small Engine Drill. The Crawford Small Engine Drill uses a reverse flow air lift system. The pump used to compress air to circulate drilling fluid never touches the drilling fluid and cannot be damaged by sand and gravel suspended in the drilling fluid. The Crawford Small Engine Drill is priced at less than $10,000 while the Village Drill costs more than twice as much for a less efficient and less dependable drill. While the Village Drill is being hauled to the job and assembled, the Crawford Small Engine Drill can set up and complete a borehole and be ready to set the casing. The Crawford Small Engine Drill has successfully drilled with bits as large as 24 inches in diameter through sand and gravel. The Village drill cannot even pass a 24 inch drill within its draw-works much less drill with a large diameter drill bit. The Village drill cannot handle large diameter drill stems that are required to remove large gravel and clay out of the borehole. And the size crew required to drill with the Village drill is twice as large as the crew required for the Crawford Small Engine Drill.
When one considers all the advantages of the Crawford Drills with regard to cost, production rate, durability, and ability to drill through large gravel there is no comparable drilling machine available.