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Spindle loading.

Created by: CraigSimpson at: 7/24/2008 11:39 PM (7 Replies)

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7/24/2008 11:39 PM	Rate (0)
CraigSimpson Posts: 159 Rating: (1)	I have an HBM machine using 840D Powerline with Siemens motors and 611U drives. When a spindle attachment is used the load meter band goes up to 48% whilst bringing the attachment "up the hill" in rotation. It also gives a short squeak from the motor. If you stop the spindle at the right position the squeak remains constant and the load stays high. (Proving its not a mechanical problem.) I have compared the motor and CS axis drive data with similar machines and the differences arenegligable yet the problem remains only on one machine. Any ideas?
CraigSimpson Posts: 159 Rating: (1)
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7/26/2008 4:04 PM	Rate (0)
Sanjoy 4m India Posts: 55 Rating: (2)	Please clear the following points - [1] Splindle load goes upto 48%, [2] sorry - what is the meaning of " It also gives a short squeak from the motor." [3] spindle at right position - meaning !
Sanjoy 4m India Posts: 55 Rating: (2)
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7/27/2008 8:09 AM	Rate (0)
CraigSimpson Posts: 159 Rating: (1)	1- Spindle power indicator on control. 2- Shrill electrical noise from spindle drive motor. 3- Stopping the spindle at precisely the right time (certain degrees, ie 245.000 degrees) will hold the load indicator at 48% and the audible noise is constant. Hope this helps. Craig.
CraigSimpson Posts: 159 Rating: (1)
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9/2/2008 7:50 AM	Rate (0)
chinna Experienced Member Joined: 9/10/2007 Last visit: 8/13/2024 Posts: 78 Rating: (3)	It seems like a Position Control Gain Problem... reduce the gain and check...

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9/2/2008 12:34 PM	Rate (0)
OvidiuNastac Silver Member Joined: 1/29/2008 Last visit: 7/26/2022 Posts: 419 Rating: (19)	Dear Sir If the squeak is only in a certain position, this sims to me that is a mechanicalissue (i.e. a backalsh) combined with a high position control gain. Haw many encoders are? Best Nit

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9/3/2008 6:39 PM	Rate (0)
CraigSimpson Posts: 159 Rating: (1)	Hi, The squeak is not mechanical, it is an electrical "squeal" from the spindle motor. As I described earlier if the spindle is stopped at the correct degrees the squeal stays and the load meter stays high - even with no motion - ruling out a mechanical problem.
CraigSimpson Posts: 159 Rating: (1)	Last edited by: mecky at: 9/3/2008 6:43 PM
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9/4/2008 4:35 PM	Rate (0)
OvidiuNastac Silver Member Joined: 1/29/2008 Last visit: 7/26/2022 Posts: 419 Rating: (19)	Hi I don't say that the squeak is mecanical. I say that do to a mecanical issue (backlash, blocking or others) combined with a high position (or velocity) control gain the motor is overloading and is "screeching". So try to decrease the velocity or position control gain or try to use some filters. Best Nit

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9/4/2008 5:20 PM	Rate (0)
CraigSimpson Posts: 159 Rating: (1)	Thanks Nit, Will try these when I next have our machine for maintenence.
CraigSimpson Posts: 159 Rating: (1)
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