Meh. Show us empirical evidence that the Chinese made mills with bearings actually makes a longer lasting mill all around.
Again if the bushings wear out I can replace them for 5 dollars. How much do new rollers cost for the superior chinese bearing mills and can you link were I can buy them?
I'll also wait. Cheers
Nice.
I ask for evidence to back up your assertions and all I get is your strawman argument about Chinese mills.
I didn't expect a reasoned argument from you, and I knew you wouldn't be able to offer up a sustantive reply. But I had to try, right?
But since you live in a world of anecdotal data, I will offer mine vis-a-vis MM, since you believe no one has had trouble with them. Someone has to be the first to point it out, and it might as well be me. The apertures of the sintered bronze sleeve bearings in my MM-2 have become out of round, due to the radial loading of my pulley system over time. There is a small amount of radial movement of the shaft now that wasn't present when the mill was new. It's not at a critical stage yet, and the play is perhaps a few thousandths of an inch. But it has manifested itself and I have now added a coupled driveshaft held in place by two roller bearing pillow blocks to limit the radial loading on the mill bearings and prolong its lifespan.
A few salient points on bearings and manufacturing:
Your "Chinese-made" argument is too vague and over-broad to have merit. Manufacturing quality varies greatly across different manufacturers in any country--including the U.S. Country of origin, in and of itself, is not an accurate predictor of quality. Again, you need some statistical evidence to make a judgment call.
A $1-$2 savings on a component used in a $200 consumer device in not trivial. If you think that MM would overlook a cost savings like that, you fail to have a good grasp of manufacturing economics. It's all about maximizing margins, and every dollar saved on materials is a dollar profit.
The mere fact that MM installs
steel roller bearings in some of their top-line mills tells me that they are acutely aware of the superiority of those bearings, and are willing to pass along the added price to buyers of premium mills.
So where are we on the sleeve vs ball dichotomy? Let's check with
an industrial source for their thoughts on the basic principles of the two bearing types:
*Both sleeve and ball bearings work well in applications involving
thrust loads only.
*Sleeve bearings are generally quieter than ball bearings, but that is a non-issue, as the sounds from milling will mask that.
*Sleeve bearings are best applied in vertical orientations, while ball bearings work well both vertically and horizontally.
*Ball bearings are superior in cases of radial-loading, which would be the case of belt-and-pulley systems. Direct-drive and gearbox systems would limit this radial-loading, but horizontal shaft positioning may still be an issue.
*Ball bearings with sealed enclosures can be selected, and such bearings generally have better lifespans, due to better lubrication. Sleeve bearings can and do leach out lubricant over time.
*Both bearing types can be press-fitted onto a shaft and easily removed if needed, so the argument re replacement difficulty of ball bearings is moot.