Welcome, Guest. Please login or register.
Did you miss your activation email?
September 30, 2014, 11:01:00 PM

Login with username, password and session length
Search:     Advanced search
* Home Help Search Calendar Links Login Register
  Show Posts
Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 »
331  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
332  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
333  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
334  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

335  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
336  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
337  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 19, 2012, 11:41:54 AM
Made a PCB last week for all the buttons on the front panel:


Soldering was a pain with all the jumpers that were needed. It took a few hours spread across a couple of days, and this is after all the components have been soldered to it:


The buttons are tactile buttons and they will have caps with different colours. For the overrides I used mechanical encoders.

Dan
338  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 15, 2012, 12:20:46 AM
Thanks JH. I am getting close.

Dan
339  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 08, 2012, 01:28:22 PM
A small update. Ball screw guards mounted:



Dan
340  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 07, 2012, 10:44:07 AM
Ah...  so a fault signal from a drive won't cut off power to the drives on your machines. That explains it. Hmm... The little lathe only has a servo on the spindle. The axes are steppers. So I think I will do the same then. A fault signal from the servo will cut power to the steppers and send a signal to Mach3. Somehow I overlooked this and wanted the servo cut power to itself on a fault Grin

Dan
Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 »
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!