High helixend mill

Yes. Yes, they can. We discovered over the years that drill bits play a huge role in the speed of uptake and success of results with tree injection.

High helixball screw

There are none. In my experience. I've watched all the videos, read all the posts. Nothing makes the drill go any further than about one inch in any wall in my flat. You just end up making a bigger and bigger hole to fill in afterwards.

Variablehelixend mill

It's pretty hard to determine whether you're hitting a very hard bit of aggregate or steel / metal, and if it is metal, it's hard determine whether it's safe to drill that metal. In some cases, for example concrete beams, cutting the steel in the concrete can weaken the beam. It's also possible you're hitting a water pipe, waste pipe, or an electrical conduit.

If you cut that cable you're looking at a crazy amount damage when that steel cable breaks and shoots out of the side of the building. The correct procedure in a post tensioned concrete floor is to have it x-rayed located to verify your holes are in places where there are no steel cables.

End millhelixangle for aluminum

I drilling somewhat deep holes (inch and a half) into concrete and I'm hitting something hard in two out of my four holes. I'm fairly sure it's not metal I'm hitting and I'm wondering how to proceed. It's a new building (finished half a year ago - in October 2018) and it is in Sweden, so I'm sure modern building standards have been followed.

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Unlike traditional drill bits, high helix drill bits are sharpened on both edges. Changed every 5-10 trees, it can completely change how long you spend at the job site, and ultimately, how many trees you can protect in a day. Imagine, something as mundane as a drill bit changing your injection game.

You're probably hitting a steel cable used for post tensioned concrete. You need to find out if you have that kind of floor system before doing anything more.

High helixscrew

I'm using a proper rotary hammer and a proper concrete drill for the job and as far as I can tell the tip is not getting dull or anything. Could it be a rock or something? Or is modern concrete fairly uniform? Any suggestions on how to proceed and get past this obstruction?

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You may be hitting rebar, the reinforcing steel embedded in concrete. You can buy a rebar cutter the same size as your concrete drill bit to get through the rebar then switch back to your concrete bit once through. However a great deal of caution is in order.