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331  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

332  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



333  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

334  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 21, 2012, 01:43:13 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
335  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 21, 2012, 10:52:47 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
336  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 21, 2012, 10:23:15 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
337  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 21, 2012, 02:56:11 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
338  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 20, 2012, 05:03:36 AM
Be aware that the Ultra 5000 don't accept any external signals (step/direction or other). They were not meant to be used with an external controller. They do have an option for electronic gear follower, however, and this is the mode I am planning to use mine in.

cut the power to the drive(like I do) but if the friction of the slides wasnt enough to brake things instantly (or very close) I was  going to use the spare contact on the contactor to  apply the overtravel inputs thus allowing the drive to instantly halt the motor.

And that is while the drive is not powered already? Not sure I would trust this. I have followed the recommendation in the Ultra manual for switching in braking resistors and it's been working great and I think I will stick with this approach.

Dan

339  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 20, 2012, 02:43:47 AM
Thanks guys.

Hood, the Ultra 5000 has an embedded controller and is intended for stand alone applications. It doesn't have any inputs/outputs tied to any hardware feature and it has a microcontroller which you can program in C to do whatever you want, so I believe you could program it for limit inputs. Are you suggesting this in place of disconnecting the motor from the drive on an Estop? Doesn't look safe to me...?

Dan
340  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 19, 2012, 12:02:19 PM
Have been working on the wiring for the past few days. Interesting how many wires there are for machine which merely has 3 motors. Here is the component plate, a moment before I mounted it inside the cabinet, with all the components wired:


And all this to eventually control 3 motors Wink

I decided that cutting power to the spindle drive on an Estop event was not what I wanted, since I didn't want the spindle to freewheel to a stop, but rather stop instantly, so I am using a contactor (bottom right) to cut the motor phases from the drive and switch in resistors between them instead, to dynamically brake the motor. I feel more comfortable with this.

Dan
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