Cannon Twin Boom Jumbo with Atlas Copco Bits

This is the drill used in our test to prove that our bits out penetrate any others. We ran against the Mitsubishi 32RTP51SA036A bit which had held the record for consistent average penetration. Mitsubishi averaged 1:05 in this mine, however, we smoked them with a :58 second average.
2" diameter bit on 16ft hex steel.

Category:

Science & Technology

Tags:

• Atlas Copco
• Mitsubishi
• Cannon
• CH38
• mining
• Venture Drilling Supply

[a2zhandi]

dry drilling?

[MiningGuy]

@a2zhandi

Air with water mist.

[MrDuderivers]

@a2zhandi

me and you are on the same page then!!!. 5 years on a Axera D07 development.

*Too much feed = slower rotation = precussion smashing old cuttings/bogging

*Not enough flushing = slower rotation = precussion smashing old cuttings/bogging

plus a million other factors. For me the idea of drilling quick was to keep rotation at max when the other two were set correctly. when rotation drops, speed drops, adjust other two.

[a2zhandi]

@MrDuderivers if I remember the vid correctly, I believe it was just a showing off of the new design bit. Marketing scheme perhaps.

Thanks

[a2zhandi]

@MrDuderivers Right. It's called excessive laboring. A sharp bit/blade saves on the rest of the tool. Water cools the bit, flushes the cuttings, (reduces regrind).

I drilled 6"x 120' production blast holes for 5 years. Probably closer to 10 years with all the double shifts I did.

Believe it or not, rotation & feed pressures play a huge role in both penetration & machine labor. But with a jumbo such as this, there isn't a variable rotation. Just wide open & feed to the max.

Thanks

[MrDuderivers]

@a2zhandi

Only thing i can think of with lack of water would be water may react with the ground and could create a few things, Gases/chemical reaction, deteriorate ground conditions/ground control problems, poor mining technics for whatever country there in.

Hopyfully Mining Guy can clear this up for us

[MrDuderivers]

@a2zhandi

I'm with you, but not only that, water mist won't catch all the dust so its a health issue and boring would be slow because water is not flushing the hole. (air does this but not as good). The jumbo will heat up because theres not water cooling the drifters and hydraulics. bits, drifter hammers, steels, electric motors, basicly everything on this jumbo will deteriorate heaps quicker because of lack of water.

[a2zhandi]

@MiningGuy I gather there is NO water going to the bit. Can you tell me the logic behind this? Surely heat will degrade any bit within a few holes.

Thanks