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311  General CNC Chat / Show"N"Tell ( What you have made with your CNC machine.) / Re: Impact Engraving. on: August 14, 2012, 08:25:34 AM
Looks very good, Tweakie. Unfortunately never got around to finishing my impact head. But I am still planning to revisit it and pictures like this really give a push Wink

Dan
312  Tangent Corner / Polls / Re: Most Popular Motor Frames on: August 14, 2012, 08:21:36 AM
Hi,

Replied your other post here:
http://www.machsupport.com/forum/index.php/topic,13579.msg154624.html#msg154624

Dan
313  Tangent Corner / Bargain Basement / Re: Back Covers For Stepper Motors on: August 14, 2012, 08:20:06 AM
Didn't make them. But I am being pushed so decided to start making them. I will have to find some time to design the mould and then make it. I cannot guarantee time frames though as I am very busy. May be by the end of this year.

Sorry for it taking this long. I will post an update

Dan
314  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Conect 121 lathe retro on: August 10, 2012, 01:16:24 AM
They look very professional indeed. Can't wait to see how it works for you.

Dan
315  Mach Discussion / General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course on: July 26, 2012, 12:02:58 PM
Hey Steve. Interesting new project to follow. Always nice to see your work and the way you present it.

Dan

P.S.
If you could resize a bit your photos it would make it easier to watch them as they are too wide to fit on the screen.
316  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 23, 2012, 03:27:39 AM
That's an interesting controller. I was not aware of it. Will be interesting to see how it works for you. Found the introductory thread for this controller and your last question is back from May and was not addressed, which makes me wonder if they still work on it and all issues have been sorted.

Dan
317  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: July 22, 2012, 12:02:39 PM
We'll have to keep waiting for Greg to fix this then Sad

Dan

318  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
319  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
320  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
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