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331  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 29, 2012, 12:04:32 PM
I am having a problem trying to tune the Ultra 5000 servo drive. Autotuning doesn't appear to work as the values it calculates don't give good performance and are the same values regardless of the mass connected to the motor.

I can't get it to hold position. It keeps producing this annoying buzzing noise. And it eats up all the current set in the current limit. If the current limit is small the buzzing sound stops and the current drawn in a standing state approaches zero as expected. But at this currents the system cannot operate as the motor doesn't have enough power.

Tried to play with all the parameters, but still can't get it stand still without producing the noise and drawing so much current.

I was able to tune the servo to fair results with the chuck removed, but have no luck with it mounted.

Does anybody have any thoughts? Must be something I am overlooking or doing wrong. JH? Hood? You set up far more servo systems than I did.

Dan
332  Mach Discussion / VB and the development of wizards / Re: CNC Grinder Wizard /Screenset on: June 28, 2012, 03:46:27 AM
Nice work, Terry!

By the way, may I ask why CNC? Isn't hydraulic much faster, quieter and simpler?

Dan

333  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 27, 2012, 09:51:46 AM
Thanks JH. Working on the spindle servo now. Programming the drive to do all the stuff I want. A few little things still left then to get it fully running: fitting the home switches, the cable carrier for the carriage, fitting a guard on the chuck with a motor disable switch and fixing the tray and guards. Got them welded already, but the tray came out horrible. It's stainless and was TIG welded, but still got seriously (and I mean SERIOUSLY) distorted.

Dan
334  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 25, 2012, 12:50:28 PM
Hood,

I had them set directly in Port and Pins. Just tried using an OEM trigger instead and it behaved absolutely strange - a single short button press and the axis doesn't stop till it hits soft limits.

Dan
335  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 24, 2012, 12:04:44 PM
Thanks Hood.

You and Russ were right about the external buttons. I just played with a simple push button in place of the tactile ones and it demonstrated same behaviour. Thought may be the controller frequency would have an effect on this, but it absolutely didn't.  Too bad it's the way it is as the jogging buttons  are almost useless Sad

Dan

P.S.

LOL... just reread my post from yesterday and it's funny how I assumed it was wire inductance.... probably was late enough to make me think not clearly Grin
336  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 23, 2012, 02:39:13 PM
A good idea, Russ. Will have to test with another switch and same wire length to be sure. Could be the wire inductance playing a role (thought currents being sunk by the ESS are extremely low)... hmm... but then as far as I can tell it does start immediately, but it's when I release that it lags. I will do the test to find out.

Thanks.
Dan
337  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 22, 2012, 11:48:47 PM
Hi Russ,

Thanks for the compliments.

I am sure about the buttons as when I jog from the keyboard it's perfectly responsive. With the keyboard I am able to do a very short touch on the key and the axis would hardly accelerate, moving just a bit. With the tactile buttons, on the other hand, no matter how short of a touch you try to do it would always move that minimal amount, managing to accelerate to full speed (or close anyway).

Sorry for the video. Please check now.

Dan
338  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 22, 2012, 02:19:40 PM
Here is a short video of the first test running the axes (sorry for the poor quality as I tried to keep the file size reasonable):

<a href="http://www.youtube-nocookie.com/v/oYIXuNLr62c?version=3&amp;amp;hl=en_US&amp;amp;rel=0" target="_blank">http://www.youtube-nocookie.com/v/oYIXuNLr62c?version=3&amp;amp;hl=en_US&amp;amp;rel=0</a>

Rapids are 8,000mm/min for the Z and half that for the X.

Dan

339  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 22, 2012, 12:00:13 PM
This is the cabinet with all the components mounted inside and wired:


Buttons caps are not fitted yet. There is one thing that I have already found out about the tactile buttons - they are absolutely not suitable as jogging buttons. After releasing a button it doesn't spring back instantaneously and the axis continues moving for a fraction of a second after the button has been released. Wish I knew this when I was designing the control Sad

There are quiet as many components on the back of the door as well (PC motherboard and hard drive) Wink


Dan



340  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 22, 2012, 11:47:40 AM
Got the motors mounted.

X axis motor mounted:


Z axis motor mounted:


I think I mentioned this previously, but just in case: the motors are 400 steps/rev NEMA23 steppers from Keling.

Spindle motor mounted:


It's an 800 watt Parker AC servo motor which is to be controlled by the Ultra 5000 drive just mentioned. The motor is rated at 7500rpm so I geared it down to get more torque. Won't need more than 3000rpm on this machine anyway.



And with the cover in place:


Dan

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