Makita Rotary Hammers compared or what you think.

[gold tramp]

As always, talking about drilling is Always easier than actually drilling. Yesterday morning drilling, again... Choices we make in life, join a gym or become a hard rocker. View attachment 1995182 View attachment 1995182

I use this same drill mine doesn't look as clean as yours, Been drilling 1. 5 holes for about 8 years in the desert heat it still going strong.
A little slow but does the job, all I have is electric out in bush.
Now that I bragged on it Murphy will probably show up half way through my next hole ...
Gt..

 

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[Assembler]

I use this same drill mine doesn't look as clean as yours, Been drilling 1. 5 holes for about 8 years in the desert heat it still going strong.
A little slow but does the job, all I have is electric out in bush.
Now that I bragged on it Murphy will probably show up half way through my next hole ...
Gt..

Interesting this shows that you can do a fair amount of drilling with a electric drill. Yes this is good news.

 

[Assembler]

I found a good source for a SDS-Max chuck to spline shaft for around $127.00 plus shipping that you could weld to your own jack shaft setup. This will really cut down the cost plus this makes the self-made gas-drill is still on.......yeppy do daa........lol.

 

[Assembler]

Found as source for a 2 Cycle Jackshaft/Motor Mount

Off the shelf already made jackshaft

· 6061-T6 Aluminum

· Comes complete with 3/4" x 11" x 3/16" keyed shaft

$150.00

This would work great for the selfmade gas drill.

 

[Assembler]

The same source has a steel plate frame for around $65.00. Since weight may be an issue on a steep slope I may try both models that is steel and aluminum frames. I will shoot for the 120 and 450 RPM ranges. I will try to get water down the hole for the faster speed.

 

[Assembler]

Found a different source for carbide drills. As far as water coolant issue goes I found a 2 flute coolant flow drill of 3/4" dia. size for around $180.00 however is only 18" long, this would be great for smaller rock and faster drilling.

 

[Assembler]

I looks like the drill that has coolant flow through the center will drill way faster then many other conventional drills depending on the rock as a 2 flute drill should be very grabby. This drill has 3 flats to it so a different chuck will have to be used.

I'm thinking of trying this drill out maybe on not so hard rocks.

 

[Assembler]

I may break down and buy the HF Hercules rotary hammer as it is on sale the month at HF.

It will be a start.

 

[Assembler]

The selfmade gas drill is still on as I can see the the HF hammer drill is going to be slow.

 

[Assembler]

I'm thinking if a water coolant drill is used then the rpm speed can go way up for drilling.

Just like cutting metal with tools the speed can go up with the use of coolant. The same should be the case in drilling rock plus the superior chip or wast removal.

 

[Assembler]

I'm wondering if the speed can be increased 3 - 4 times with coolant pumped through the drill.

 

[Assembler]

A solid carbide coolant drill is not cheep for just a 18" long by 3/4" dia. drill however if the rpm's can be increased 3-4 times it may be worth it. Time is money out there if you are also facing the weather and the fire season.

 

[Assembler]

By the way you can drill over the same hole with a much larger drill if you can stop any walking going on. This should really speed thing up if this is doable as you can flood the second drilling hole with a clay ring water hole to flush and cool the larger drill hole.

 

[Assembler]

I'm even thinking of a pressure washer as the pump for the drill. Hope this idea does not get to wet may have to have some kind of spray shield in place.

 

[BlasterJ]

Chewing through the rock in a rotary fashion should work on soft rock. My experience with harder rock is that most of the work is done by the concussion or "hammer" effect of the drill on the rock. The motion may not even happen until the rebound.

 

[Assembler]

What I'm describing is just a high speed drill with water coolant flow.

 

[Assembler]

I know this is going to drill very slow. I picked up a 4 1/4" hues tool star type of carbide bit from the local metal recycle yard for a song with coolant ports.

Anyone use old hues tools star or rotary bits out there?

Anyone use lager holes for wedging cracks in rocks?
Thanks.

 

[Assembler]

When the weather gets better I will look for a smaller star carbide drills from the same source.

Did buy about a hundred twenty lbs. of wedges to go into the holes.

 

[Assembler]

Electric drills in general are light duty and can not drill a very big hole. Time to start thinking about a more powerful type of drill. Maybe hydraulics?