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441  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

442  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
443  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
444  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

445  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
446  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
447  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
448  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
449  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: June 29, 2012, 12:04:32 PM
I am having a problem trying to tune the Ultra 5000 servo drive. Autotuning doesn't appear to work as the values it calculates don't give good performance and are the same values regardless of the mass connected to the motor.

I can't get it to hold position. It keeps producing this annoying buzzing noise. And it eats up all the current set in the current limit. If the current limit is small the buzzing sound stops and the current drawn in a standing state approaches zero as expected. But at this currents the system cannot operate as the motor doesn't have enough power.

Tried to play with all the parameters, but still can't get it stand still without producing the noise and drawing so much current.

I was able to tune the servo to fair results with the chuck removed, but have no luck with it mounted.

Does anybody have any thoughts? Must be something I am overlooking or doing wrong. JH? Hood? You set up far more servo systems than I did.

Dan
450  Mach Discussion / VB and the development of wizards / Re: CNC Grinder Wizard /Screenset on: June 28, 2012, 03:46:27 AM
Nice work, Terry!

By the way, may I ask why CNC? Isn't hydraulic much faster, quieter and simpler?

Dan

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