g0704 problems

[ShuffleSk8ter]

Ultimately it comes down to the Spindles being assembled correctly or not. I realize that there is some break in with all machine tools but a break in wont make up for bearings that are too tight.

How many machines do you or have you owned new?...

sorry to say but breaking in a machine properly does make a notable difference....IMMHO

but let me just say that I agree that if something is wrong in the spindle/motor/gears that this can put hi stress on the motor ...so

[wizard]

Right out of high school I was working in a shop as a mechanics helper rebuilding machine tools. After that a few years in zinc die casting. That has been followed by about 25 years in the automation industry. Part of that automation work involved a production line of single point diamond turning lathes and other associated optical production equipment.

How many machines do you or have you owned new?...

Right now my personal shop is small, mixed between woodworking tools and metal working tools. At work we have a few Bridgeports and lathes in the maintenance shop, the maintenance shop is not the tool room.

sorry to say but breaking in a machine properly does make a notable difference....IMMHO

I never said it didn't. However anti friction bearings can be installed in such a way that they either seize up or tighten excessively. No amount of break in will fix that. Beyond that ball bearings are not subject to the same sort of break in that other machine components are.

My point is if you loose a motor or drive when initializing a machine you really need to look at the drive train that motor was driving.

Look at this way let's say you have a machine that blows a fuse after running fine for years, do you blindly replace that fuse or do you look a little deeper? In this context you have the known issue of bad motors/drives on these mills which could be the problem. However it is just prudent to look a little farther when putting in a new motor and drive.

but let me just say that I agree that if something is wrong in the spindle/motor/gears that this can put hi stress on the motor ...so

That is the whole point of my post. One shouldn't blindly reassemble a machine, without looking closely at all of the involved components. I'm not discounting the crappy electronics and motor, I'm just trying to get people to look at the bigger picture.