Welcome, Guest. Please login or register.
Did you miss your activation email?
October 31, 2014, 10:54:16 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 »
311  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 22, 2012, 02:45:31 AM
Hood,

Thanks for the doc. The Ultra 5000 has a somewhat different tuning screen, but I think I can try implementing some of the recommendations, like the scope setup. Wonder if they could provide a similar doc for the 5000 if I asked.

I emailed you the plugin. Please let know how it works for you.

Dan
312  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 21, 2012, 02:02:42 PM
Hi Hood,

I was not able to tune the spindle Sad Just looks like the Ultra 5000 has the wrong parameters for tuning a servo. Can't get it hold position and be stiff at the same time. Either can get it position tuned or be stiff. Put in an AMT programmable encoder instead of the original 1000 ppr one the other day. Set it to 2048 ppr and tried to tune it. Had only less than an hour to play with it, but it didn't feel any better. In fact may be even worse, but I am not sure. The belt, although pretty tight, starts behaving as a musical instrument string when I try to increase the position gain. And in the same time I get overshoot on position. The point when I am happy with the position gain and there is no overshoot, the spindle loses stiffness completely.

Regarding the plugin, yes, Greg sent me a version with quadrature signal for the spindle, but he said he didn't think it would solve the problem we were experiencing, but it would be nice if it did in some way. If you like to play with I can send it to you. It works very well here, and in spite of what Greg said I haven't been able yet to get any symptoms of the problem we were seeing with the spindle. SRO seems to be working fine as well as CSS. But I only had a few minutes to play with it.

Dan

Dan
313  Mach Discussion / General Mach Discussion / Re: Minor Threading Problem on: July 15, 2012, 01:47:28 PM
Hi John,

The number you arrived at seems to be right based on the mathematical formula for a 60: DOC = 0.5 x Pitch x tan60 ≈ 0.866 x Pitch ≈ 1.3

Dan
314  Mach Discussion / General Mach Discussion / Re: Minor Threading Problem on: July 15, 2012, 11:47:53 AM
Hood, I think it would depend on the tool tip radius. John's probably sharper (smaller radius) than yours.

Dan
315  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 13, 2012, 12:48:50 PM
Thank you for sharing, Joe.

Dan
316  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 13, 2012, 02:41:25 AM
Just watched your videos. You have one huge workshop there... and it looks so clean in the same time... I liked it. The lathe looks good too. In my opinion, with the Chinese stepper drivers, the motors or louder as compared to Gecko. And speaking of this, I would love to try out Granite Devices drives with stepper motors. They claim that they drive the stepper with a sine wave and I think it would make the motor run quieter and smoother. However, their drives are a bit expensive.

Dan

317  General CNC Chat / Show"N"Tell ( Your Machines) / Re: O3N250 on: July 10, 2012, 02:18:16 AM
You did a good work with screen set, Peter. I like the look.

Dan
318  General CNC Chat / Show"N"Tell ( Your Machines) / Re: O3N250 on: July 09, 2012, 02:41:03 PM
Looks good! Are you using a Pokeys or how did you implement the knobs?

What's the screen set you have there?

Dan
319  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 04, 2012, 02:49:35 AM
You mean it fully stretches and contracts with the nut move? That's nice.

Dan

320  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 30, 2012, 11:21:10 AM
Found the problem finally Smiley!!! It appears that Autotuning is seriously broken in the Ultra 5000. Once you have used this feature the drive goes crazy and is virtually impossible to tune. After using the Autotuning you have to reset the drive in order to get things back to normal.

No this crazy buzzing has stopped for me and I can at least try and tune the system Smiley

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!