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Typically very hard, imagine drilling into a granite top at your local cocktail bar... Imagine it twice as hard... Now in terms of drilling in all boils down to the amount of air pressure you have going DTH to break and pulverize the gneiss. Typically, if one would use a 24bar 1170 cfm compressor, drilling a 6"dia hole, you will drill roughly 4-8m per hour. This is our averages in Archean granites and gneiss. It takes way much longer if you have less air pressure (less than 21bars / 300psi)
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∙ 11y ago
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Is gneiss soft or hard?
Gneiss is hard.
What is a sentence for gneiss?
I am trying to find out what the other two types of rock besides gneiss form the Matterhorn. Gneiss is a metamorphic rock. That's a nice piece of gneiss!
What rock does gneiss come from?
Gneiss may come from either granite or schist.
How are granite and gneiss the same?
Granite and Gneiss are both rocks.
What is the texture of the gneiss rock?
The texture of gneiss is coarse
Where would gneiss be in the US?
Gneiss is a part of the earths lower crust. No matter where you drill you will eventually uncover gneiss.
Is gneiss soft or hard?
Gneiss is hard.
Does gneiss turn into shale?
No. its the opposite. gneiss forms after shale goes through metamorphism
Why is gneiss hard?
Gneiss is metamorphic rock that forms from preexisting sedimentary or igneous rocks. It is developed under high temperature and pressure conditions, causing it to become hard.
What will a pillar drill drill through?
Depending on the type of drill BIT, it may drill through almost anything.
Is ultrasonic sound can drill a hole through a hard metal or a mountain?
A drill operating at ultrasonic frequencies (>20 kHz) will usually employ a hard abrasive powder to actually do the drilling. The drill bit (which could be soft) vibrates back and forth at a high frequency, and grinds the substrate away with the abrasive.
How do drill on Club Penguin?
wear your hard hat and dance to drill
How do you get the drill on club peguin for none members?
Well..... You go to the mine like you would on club penguin and go through the cave and you will find a little hard hat and drill at the side of the page in the mine and click on it i have been a non member for a day or two but you click on the hard hat and drill and you find i in your inventory
What is The use of Drill machine?
Drill machine is basically for drilling purposes. This machine is designed to drill hard things.
Can drill cut through glass?
An ordinary HSS drill bit can not cut through glass. A diamond tipped drill bit is necessary for this.
What is the best type of drill for hard concrete?
The best drill for hard concrete is one with a rotary hammer action such as a Hilti or Bosch.
What can a pillar drill cut through?
A pillar drill can cut through almost any material if the speed is correct and the appropriate drill bit is used.
