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These 2 die grinders are the worst and most expensive by far in the shop. It appears that there is a way to adjust the one of the shoulder screws so that the neck can be realigned, but as I said before IR has neglected to include instructions or the tools for it. Fourth, after about 2 weeks of using the right angle die grinder the head has become unfastened from the body and will spin around when I try to use it. That being said it only took me about 3 weeks of using the die grinder to declare it wholely unusable. It is full blast at all times. IR has also neglected to include tools to fasten down the shoulder to the neck as well. These die grinders feel as though they are extremely worn out unless the bit is not securely fastened. The bottom line is: don't waste your money on these.
The cheaper no names out perform the 3102 and 3108 any day of the week. The screws which are supposed to be able to allow the airflow pressure to be reduced don't work at all. I bought this die grinder and a ingersoll rand 3108 super duty die grinder 2 months ago for use at my job as a welder. Secondly, if the die grinder bits are fastened down with enough force where the bits won't fly out of the collet when being used then the ball bearings buzz and rub very strongly. There is not middle ground, it is one or the other and take it from someone with tendonitis, they feel like hell to use.Thirdly, the fastening tools provided by IR bend very easily.
3 weeks of use for $130 makes it a very expensive and very wasteful tool. I have tried to use an adjustable crescent wrench to fasten the neck, but that results in 2 problems, the first being that the neck is no longer aligned with the trigger resulting in a tool that is clumsy to use, unless maybe you are left handed which I am not, and second it becomes loose again very easily. First off most air tools will have something on them to adjust their speed, these being no different except for the fact that they don't work. Expect only about 10 uses out of them before you will have to switch to conventional wrenches, metric of course. I bought expensive die grinders thinking that they will feel better to use and last longer; don't make the same mistake that I did.
No instructions were included with the die grinder as to maintenance, use, troubleshooting or anything else so I am left to guessing as to fixing the problem.
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