Mazak Integrex C-axis oscillating/vibrating with large diameter part

pr2racing said:

Help! - I am running a larger than normal part with extended jaws on a Mazak 300 Integrex. The spindle is buzzing due to the added weight/inertia. If I do a spindle orient it buzzes like crazy. If I turn the part, it buzzes bad enough that the finish is not acceptable. I have spoken to multiple people who have said that the spindle gain needs adjusted. I called Mazak and they will not tell me what or how to adjust but that they must send a service tech. I was told and read that there is a parameter SP038 that needs adjusted. The parameter currently reads &0004. Does anyone have any experience with this? Does &0004 mean anything?

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cameraman said:

Sorry I don't have a direct answer for you but was wondering what diameter + length and weight of the part are you doing on the I-300 ? [Material might be secondary to your actual problem but curious as to what ( and maybe how) you are cutting ? ]. [Range of RPMs ? -ish for what you need to do ?].

How old is the machine / what kind of model ?

When you say "Turn" the part you mean actual turning operations + buzzing + surface finish problems (rather than rotating the C axis during milling operations) ?


How many of these parts have you run on this machine, or is this a "New" part ?

Ta.

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Would you consider this a tweak that should be made without calling out official service tech?

Did you guys buy the machine new or second hand ?

Interesting point about possible low end torque curves for that c axis / turning spindle. For milling and positional I think the machine engages a special worm drive but for low end torque for slow RPM turning I'm not 100% sure what the machine is capable of ? [Something I should probably check out yo] .

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pr2racing said:

Reply o questions from cameraman



I am the second owner. It is a 640 mt pro control. The part is 20" oD X 16" id x 6" long. It is a new part for us and we plan to only run 4 pc. Holding with extended jaws on 10" chuck. Problem is only on subspindle the main spindle handles the part perfectly. It is a direct drive spindle motor. It is a facing operation so it is turning the part 700 sfm (200 rpm approx). The spindle is humming as it turns due this spindle tuning. If I do a spindle orient m200 it goes crazy buzzing violently.

It has always buzzed like this during a part transfer during the time both spindles were oriented and both chucks were still clamped on the part. I had read on an integrex forum that no longer exists that others had this problem and it was resolved by spindle gain tuning. I never looked into it since it only buzzed for a half second on a part transfer. I also have a 200 Integrex and it doesn't do this regardless of part size. I was hoping someone that had been through this might see my post since it sounded like not a new problem.

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