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I would thread mill that. Coupled with a pre-setter (allows you to set off the pitch) thread milling basically takes any risk out of the equation.
Mike
I got ya. If your going to go BT30 drill tap machine I would probably lean toward fanuc. Even if a little lighter duty, (not by much if any depending on model), they are very reliable, fast and very accurate for a machine with out a chiller. Plus I would much rather have a 31i instead of a Brother control (we have both).
Mike
I think the Brother is a little more "Heavy duty" than the Robodrill but I if I needed to do any real milling I would stick to a 40taper/HSK63a machine. We have over 20 robodrills here and while they are awesome/accurate machines, there are limits to a BT30 interface. I would go for:
Makino PS95
Matsuura VX-1000
Okuma
Maybe even a Doosan.
Mike
We, (and a lot of other people), use a tool pre-setter (camera) to measure tools non-contact. Very accurate and you can check a lot of other things like dia, runout, angles, and radii to name a few. The only way to go IMO. A decent one will set you back 30K though.
Mike
I've pushed a 2in indexable drill on a 2000SY no problem. 2.875 may be possible on your larger machine. However, I would do like others have suggested and either drill with something a little smaller and bore, or helical open. The problem with milling it open is your live tooling unit will not do well with a tool that can do this efficiently so it will most likely add an operation.
Mike
We handle it the same way as Bob. It's some work starting out but after a few months youll find that your setting up way less tools and programming way fast. Much safer too IMO.
Mike
Possibly higher RPM of smaller tools causing thermal expansion of spindle in Z axis? What is your process in touching your tools off? Using a presetter for all tools I haven't really noticed this.
Mike
I've bought a couple and have a few more on the way. Very solid accurate machines with good support. However, I don't think you could go wrong with Okuma or Matsuura either.
Mike
Why? He knows this is a machine tool probe with accuracy of .0002 at best right? We have all Zeiss CMM's and don't even buy their styli. I believe we get them from ITP. I would try to go ceramic if you can. That way it just snaps off at impact and you don't run the risk of making bad parts because someone bumped the probe in the tool magazine or something and bends the shaft without realizing it.
Mike
If the drill is one effective flute, you are doing pretty well on feed rate. Surface footage not too bad either. Maybe look at a replaceable tip type (like the Iscar Sumocham), or solid carbide. You will get a way higher penetration rate.
Mike
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