Messages

461

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 24, 2012, 01:04:44 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

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

462

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 23, 2012, 03:39:13 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

463

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 23, 2012, 12:48:47 AM »

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

464

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 22, 2012, 03:19:40 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" rel="noopener noreferrer" class="bbc_link bbc_flash_disabled new_win">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

465

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 22, 2012, 01:00:13 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

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


Dan

466

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 22, 2012, 12:47:40 PM »

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

467

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 21, 2012, 02:43:13 PM »

Well... hope the quad signal will fix this or as you suggest will get Greg to look into that part of the code.

Hope to have an answer for the quad thing soon.

Dan

468

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 21, 2012, 11:52:47 AM »

Ah... that. I thought I was the only one reporting this to Greg. I don't tend to use SRO, but I see what you describe when I have CSS enabled - it would operate fine for minutes and then would miss some pulses and the drive would fault. Hope to be able to report how it goes with the quad signals.

Dan

469

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 21, 2012, 11:23:15 AM »

Strange. Don't know. It's also in the Ultra 100 manual - same diagram.

Why do you think quadrature will work better than differential step and direction (you have line drivers I am sure)?

Dan

470

Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion

« on: June 21, 2012, 03:56:11 AM »

Yes, ESS and quadrature output. Spindle doesn't have the quad output yet, but Greg is working on this.

That's right. This was what I was meaning regarding cutting the AC to the drive - you are relying on the bus voltage that's left in the drive just for a few seconds to brake the motor and this was what I was not comfortable with.

You can find the Emergency Stop description and diagram in this manual for instance: 2098-in001_-en-p on page 132.

Dan