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Last year I bought a Makita HR2470 for home use from German Amazon, because it had many positive reviews. Since then many negative ones appeared saying that the drill bit wobbles. There is also a user video on their site. It is an SDS-plus drill and I have an adaptor to use normal round bits too. With this I have put a ball pen in it, and touched to a paper when the drill was on, without the hammer function. It made a split pea sized circle on the paper. I also have a Bosch GBM 1600 RE normal drill. This leaves only a point on the paper, as expected.

Recently I have made with the hammer drill + adaptor (hammer function off) holes in tile, and did not know why the tile was chopped around the hole.

I have two questions. Is this a property of hammer drills, they are less precise or mine is defective? I actually sent it back, and now I am looking for a different model. Do you know any hammer drill without this problem? I understand if a more precise tool is more expensive than this.

  • The Google translator gives "wobbles" for German "eiert", and Googling "wobble in drills" shows there is a lot of concern about this. But from your description I would describe the motion as an orbit rather than a wobble. – Jim Stewart Nov 9 '18 at 12:57
  • When you have this drill on rotary only (no hammer) does it turn a drill without wobble? If it wobbles on rotary only, it is definitely so defective as to be unusable. If it wobbles only in hammer drill mode, then it may or may not be so defective as to be unusable. – Jim Stewart Nov 9 '18 at 18:00
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    The drill was sent back two days ago. Instead of a drill bit I used a pen. In the hammer drill wobbled even if hammer function was off. As I said, it drew almost a half cm diameter spot on the paper (again, without the hammer function). The same pen in a non hammer drill left only a tiny dot on the paper. – robert Nov 9 '18 at 19:05
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I have 3 or 4 hammer drills some combo units and 1 is just a large hammer / demo drill model. None of mine have the wobble you are describing brands I have are hilti, dewalt and milwaukee. For tile I would not use a hammer function but a standard drill and a diamond coated or carbide / grit coated bit. I would think the hammer action will crack the tile, I am sure it would on most natural stone tiles as they tend to crack with a wet diamond saw.

  • Sorry if it was not clear, I turned the hammer function off for the tile. I also edited the question. – robert Nov 9 '18 at 19:01
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I have a Dewalt hammer drill where the hammering action can be turned on and off. With the hammering action off, it's like any other drill. With the hammer on, it does vibrate a lot more, but I can't say it intentionally wobbles.

Personally I have never used the hammer drill on tiles, only concrete.

My hand hurts just thinking about that thing.

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My experience with drilling holes in porcelain tile is with a standard drill which makes a clean edged hole in tile, but is slow work.

Disclaimer: I have never used a hammer drill, but I think a hammer drill might be designed to wobble. This would clear dust from the hole allowing faster progress in stone or concrete and prevent jamming of the bit in the hole. A wobble makes a larger hole than the size of the drill which prevents jamming of the bit in the hole.

EDIT

You don't drill into tile with a hammer drill. See Drilling tile

To catch the drilling dust I tape a cereal box to the tile just below where I am drilling. This allows me to use both hands on the drill. After I get a hole started I switch to one hand on the drill and squirt water from a spray bottle on the drill and hole to keep the bit cool. I have found that standard ceramic bathroom tile is easy to drill through with this system, but porcelain tile is still a challenge.

  • I edited the question, the hammer function was turned off for the tile. At that time this hammer drill was my only drill, but did not used the hammering action for the tile. – robert Nov 9 '18 at 19:02
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    you can also stick a soaking wet sheet of paper towel to the wall above the drill spot and the water will slowly drain from the paper towel and run down the wall to where you are drilling – jsotola Nov 10 '18 at 2:24

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