This is a big problem with chinese ,sakura,dremil ,most craftsmen,porter cable,harbor freight saw .Made for light duty and no oiling points or bearings,just metal to metal.If your spending less than $500. on a new machine your throwing good money into the wind.I've had many a great minute ,hour day month year on these inferior machines and can't complain for all the good times i've had.I had no idea there was better.