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Spindle problem with cincinnati tool and cutter grinder 2 spindle
PekkaNF:
Found out that shim discs were not very straight either, two beaings each two rings and one shim all has to fit together.
I put all the stuff together, but did not mount it into grinder yet. Eager to test it. I think I got it, but will see when it runs some time.
Pekka
PekkaNF:
Today was the big day to put it all together....and circumstances conspired against me.
Anyway, I used one hour to contemplate which way to assemble the spindle. It is mechanically symmetrical but bearings are quite different. Also the wheel head does not rotate 350 degrees, maybe 270 degrees.
It was easy to mount the spindle cartridge back in it's place and tighten the bearing nuts. I did not yet assemble the dust shields, I want to run it hour or so, before assembling all the rest.
It does run quiet, initila impression is positive. It does not warm perceptibly, but something happens because even when it runs easy, play of 0,005 reduces to 0,002 mm or smaller (finger load). Have to run it longer to see if it starts heating up or getting tighter.
Pekka
PekkaNF:
Today I had extra hour, went to garage and tun the spindle empty for 40 mins. No load but the flat belt drive.
Starting temperature of the grage and spindle was was about 14C.
2305 lbearing temp increased to 16C in about 5 mins and stabilized there for the rest of time. Imeasured the sppindle temperature inside the shaft thread hole. Outside of the spindle warmed up in 30 mins to 16 degrees C. This is the free end of the spindle, really expected no problem there.
The fixed end with two 6305 bearings produced more heat and cased me to stop the spindle every 5-10 minutes and check how it feels. I also changed the rotation direction on every stop and once tightened the shaft/housing nuts.
Spindle "intenal" temp raised in 15 minutes to 22C and then stablilized to 21C after spindle housing reached 16C and stabilized there.
Thik it is behaving well, next step is to mount rest of the parts there (dust shields and such) and then to test magnetic table.
Pekka
gerritv:
I know your spindle is together now, here is a fascinating series of articles on the topic of spindle rebuilds.
https://highspeedtechnologies.com/category/how-to-replace-cnc-spindle-bearings/
Lots of your analysis is confirmed in the articles.
Gerrit
PekkaNF:
Thank you very much. That makes very interesting reading!
P.S. so far this grinder spindle has been fine, has to to but real work soon.
Pekka
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