[Fastest1]

Nice video and detail on your build.

[MrMetric]

Just a quick note.... I don't have the manuals on this machine, so it is possible that the information I'm providing in this thread is covered there. Anyhow, I was looking at how one replaces the bearings on a DM4400. I don't think I need to do that, but I am a little concerned by the fact that my machine was built in the 90s and I really wonder whether or not the existing bearings need to be lubricated/greased again. Unfortunately, the manuals doesn't really give any hints on that type of periodic maintenance.

Anyhow, in my quest for information, there is a good thread in CNCZONE about rebuilding a DM4400 spindle. That is awesome, but it doesn't help you with a DM2800 much... or does it.... I did some more research and while doing that I came across some information on the 2800. Unlike the 4400, you don't have a spindle cartridge, but that isn't horribly important. Just like the 4400, however, you have to 'pop' the step collar (#8 on the parts drawing... the only one I have of the machine) off the top of the spindle using hydraulic pressure. And that is purpose of the angled, threaded hole on the top of the step collar. Now, I can't tell you a whole lot more than that, but the hydraulic process is detailed elsewhere on cnczone.

Hopefully this posting will 'archive' the concept so that someone else interested in these machines may find the hint.

[PeteRondeau]

Funny enough I mention this in my latest video, after doing it completely wrong. LOL If only I had known that about a week sooner!