It is definitely Siemens I can see that on the cover... it is about 7" square and I don't see any place that brushes might be unless they are on the inside....
John On 8/18/2011 12:22 PM, Dave wrote: > I think you will probably have to order the brushes via a motor shop or > directly from Siemens if they are Siemens motors. The Siemens office > in Elk Grove Village, IL would probably take a credit card order over > the phone if you want to buy them direct. > > I don't know how big your spindle motor is but I think there was 24 > brushes in my spindle motor. They were in 4 gangs around the > commutator. They were perhaps 5/8 x 1/4 in section and probably just > over an inch long. > > I had to pull the motor from the machine so I could get to them all. > > They came shrinkwrapped to a piece of cardboard, but they were sourced > from the UK and I don't think they were Siemens OEM equipment. They > were spares that came with the lathe. > > I have no idea how much they cost. If you come up short on sources I > am sure that I know of a couple here in Indiana that will sell to you. > I also have the source from the UK also if you need that. > > Dave > > > > On 8/18/2011 12:59 PM, John Thornton wrote: >> Yes it is a common DC drive for the spindle and all the axis. I've had a >> good meter on the DC buss and can not see any voltage fluctuation of any >> magnitude when starting up the spindle. And yes it is a 600VDC buss. >> >> I'll go for the brushes next break in the action I have... I see a bit >> of time to do that in about a month. Are the brushes special? Or where >> did you get them? >> >> Thanks for the ideas >> John >> >> On 8/18/2011 11:18 AM, Dave wrote: >> >>> Sounds like you have a common DC bus between your spindle drive and your >>> Z axis drive? >>> >>> If the DC bus dips too far, the drive will shutdown. >>> >>> You may want to put a meter on the DC bus and run the drives and see if >>> the bus isn't dipping just prior to the shutdown. Make sure you use a >>> good meter - a 400 volt AC input power supply will have about 600 volts >>> of DC bus voltage. >>> >>> All drive systems have their limits. Perhaps they slightly undersized >>> the DC power supply section on that drive system? >>> >>> On my lathe I have a 611 spindle drive and I was tripping the drive out >>> frequently, I ended up pulling out the spindle motor and I replaced all >>> of the brushes which were obviously shot, and I polished up the >>> commutator and it now runs >>> perfectly. I just did that a few months ago. >>> >>> Dave >>> >>> >>> >>> On 8/18/2011 11:29 AM, John Thornton wrote: >>> >>>> I have a BP Discovery 308 with Simodrive 611 drives for the axis and >>>> spindle. There seems to be a broader range of drive/motor guys that >>>> follow the mailing list... so I'm posting the question here. >>>> >>>> My symptom is when I try and accellerate the spindle from 0 to>2400 rpm >>>> in one step the drive faults out with a generic fault. Sometimes when >>>> running the mill at 6000 RPM for a while (so good and warm) a Rapid Z up >>>> will give the same fault. I can ramp up to 6000 RPM by starting at 2000 >>>> RPM using 100 RPM increments with a G4 of 0.1 between. >>>> >>>> I've opened up the power supply section and replaced all the caps >>>> recently and that did not have any effect on the symptom. >>>> >>>> Would there be any reason to dig into the spindle and try and check the >>>> brushes? >>>> >>>> Thanks >>>> John >>>> >>>> ------------------------------------------------------------------------------ >>>> Get a FREE DOWNLOAD! and learn more about uberSVN rich system, >>>> user administration capabilities and model configuration. 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