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381  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
382  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
383  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

384  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
385  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
386  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

387  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
388  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 30, 2012, 12:50:08 AM
Ah... no, it's the same with the 5000. Also have the step current there, but again no matter what (changing the step current as well) the autotuning gives same parameters.

I tried the inertia thing and it didn't make any difference at all.

I went back and removed the belt and so tried to tune the motor alone, but interestingly I was not able. Exact same values that worked for me before, didn't this time and I couldn't tune it any better than with the chuck together. Really have no clue what's happened.

Dan
389  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 29, 2012, 02:23:17 PM
Oh... and one another question. In the custom motor setting window there is a parameter called "Inertia", may be if I enter there a value accounting for the chuck inertia it will help? Or shouldn't I do this?

Dan
390  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 29, 2012, 02:17:33 PM
Thanks guys. I checked the custom motor parameters and found a small discrepancy: torque constant was set to 0.389 instead of 0.336. I fixed it, but this is a small error and I don't think it would be that much of a problem. But I will play with tuning tomorrow to check. Oh... and there is a parameter in the Ultraware motor editor called "Rated voltage" - the one that I filled in there was "Maximum bus voltage" from the motor specs. Assume this one is correct.

Hood, I am not sure which parameter you mean when you say you had to increase the current to 50% or more.

I tried the filter, but at low values the system is very loose and increasing the filter value brings back the buzzing.

Your point regarding the low current encoder might be the case here as the encoder on this one is only 1000 lines per revolution. The images you attached are very interesting. Didn't realise it would play such a significant role on a spindle.

Dan
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