Milwaukee 2630-20 BYNFORD HARDWOOD FLOORINGLittle Pink

I purchased the RTX-B intending to use it as the cutting element on a light-duty CNC mill I built, as well as for general handheld use. While the motor power holds up under load, I was disappointed to find that the shaft wobbles excessively while spinning. Even with the tool turned off, light finger pressure against the collet would cause the end of the bit to deflect visibly. For drilling and milling tasks, this shaft wobble resulted in uneven cuts with a larger diameter than the bit itself, as the bit is not so much spinning as orbiting within the work piece. For hand grinding or cutoff wheel use, it resulted in excessive "chatter" against the work piece in some orientations.

Since I'd already invested the time building a mount for the tool, I decided to take it apart rather than try for a refund. The problem stems from the way the collet shaft is attached to the motor internally. Rather than a rigid coupling, the motor and shaft are coupled via what is essentially a universal joint. In addition, the motor itself is mounted on rubber vibration dampening pads, and so itself can move about inside the case when load is applied. Together, these factors cause the shaft end to wobble all over the place.

If you have already bought this tool and experience the same problem, it is "fixable" if you can get inside (the tool is held together by a mix of Phillips and security "star" screws). Running a generous portion of JB Weld into the U-joint, front bearing mount and around the rubber motor mounts seems to have cleared it up for me.Makita Bare-Tool BSS610Z 18-Volt Porter-Cable 330DEWALT DCF895L2 20-VoltBosch GTS1031 DEWALT Bare-Tool DC823B Makita 4329K 3.9 DEWALT DCK955X 18-Volt DEWALT DC750KA 9.6-Volt Bosch 1617EVS 2-1/4 HP Bare-Tool Milwaukee 2650-20 M18 18-Volt Porter-Cable PCL418C-2 18-Volt Makita Bare-Tool BSS610Z 18-VoltShop-Vac 1032000 Porter-Cable 7518 DEWALT DCK274L 18-VoltMilwaukee 2426-20 M12Bosch PS60B 12V Bosch MX30EK-33 Porter-Cable 7800 4.7 Fein FMM 250Q

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