Dynomotion

Group: DynoMotion Message: 10227 From: mljh Date: 10/2/2014
Subject: Just getting started with KFlop

Hello all, I've decided to use KFlop for motion control on a Grizzly G0602 10x22 lathe I am converting to CNC.  I'll most likely start with using Mach3 as the front end since I have a lot of experience with it. I've converted or built 6 other CNC machines over the years but this will be the first "non parallel, non Mach3 controller" conversion. So I have a couple of questions!


1) I'll be driving a pair of 570oz/in NEMA 23 steppers with Keling KL-5056D digital bipolar drivers. I have not yet figured out how I will interface these to the KFlop. They are 5V logic for the Pul +/- and Dir +/-. Do folks typically interface directly to the GPIO #0 pins as indicated in the block diagram?


2) I plan to convert the G0602's motor over to a VFD with an encoder so I can thread. What is recommended for an encoder - I read the FAQ on encoders but does anyone have any specific product recommendations for a quadrature encoder for spindle RPM?


thanks!

Michael 

 
Group: DynoMotion Message: 10229 From: Tom Kerekes Date: 10/2/2014
Subject: Re: Just getting started with KFlop
H Michael,

Those drives are probably incompatible with KFLOP because of the 5us Direction Setup Time requirement.  It seems those are the slower 200KHz drives from Leadshine.  See:

 
USDigital.com is a reasonable source for encoders.  High resolution should not be necessary.  Try to purchase encoders with differential outputs whether or not you initiallly want to use differential signals.

HTH
Regards
TK

From: "mhackney@... [DynoMotion]" <DynoMotion@yahoogroups.com>
To: DynoMotion@yahoogroups.com
Sent: Thursday, October 2, 2014 8:42 AM
Subject: [DynoMotion] Just getting started with KFlop

 
Hello all, I've decided to use KFlop for motion control on a Grizzly G0602 10x22 lathe I am converting to CNC.  I'll most likely start with using Mach3 as the front end since I have a lot of experience with it. I've converted or built 6 other CNC machines over the years but this will be the first "non parallel, non Mach3 controller" conversion. So I have a couple of questions!

1) I'll be driving a pair of 570oz/in NEMA 23 steppers with Keling KL-5056D digital bipolar drivers. I have not yet figured out how I will interface these to the KFlop. They are 5V logic for the Pul +/- and Dir +/-. Do folks typically interface directly to the GPIO #0 pins as indicated in the block diagram?

2) I plan to convert the G0602's motor over to a VFD with an encoder so I can thread. What is recommended for an encoder - I read the FAQ on encoders but does anyone have any specific product recommendations for a quadrature encoder for spindle RPM?

thanks!
Michael 
 
Group: DynoMotion Message: 10230 From: Colin Fera Date: 10/2/2014
Subject: Re: Just getting started with KFlop
I use very similar lead shine drives and don't have a problem.


On Oct 2, 2014, at 11:16, "Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com> wrote:

 

H Michael,

Those drives are probably incompatible with KFLOP because of the 5us Direction Setup Time requirement.  It seems those are the slower 200KHz drives from Leadshine.  See:

 
USDigital.com is a reasonable source for encoders.  High resolution should not be necessary.  Try to purchase encoders with differential outputs whether or not you initiallly want to use differential signals.

HTH
Regards
TK

From: "mhackney@... [DynoMotion]" <DynoMotion@yahoogroups.com>
To: DynoMotion@yahoogroups.com
Sent: Thursday, October 2, 2014 8:42 AM
Subject: [DynoMotion] Just getting started with KFlop

 
Hello all, I've decided to use KFlop for motion control on a Grizzly G0602 10x22 lathe I am converting to CNC.  I'll most likely start with using Mach3 as the front end since I have a lot of experience with it. I've converted or built 6 other CNC machines over the years but this will be the first "non parallel, non Mach3 controller" conversion. So I have a couple of questions!

1) I'll be driving a pair of 570oz/in NEMA 23 steppers with Keling KL-5056D digital bipolar drivers. I have not yet figured out how I will interface these to the KFlop. They are 5V logic for the Pul +/- and Dir +/-. Do folks typically interface directly to the GPIO #0 pins as indicated in the block diagram?

2) I plan to convert the G0602's motor over to a VFD with an encoder so I can thread. What is recommended for an encoder - I read the FAQ on encoders but does anyone have any specific product recommendations for a quadrature encoder for spindle RPM?

thanks!
Michael 
 
Group: DynoMotion Message: 10237 From: mljh Date: 10/3/2014
Subject: Re: Just getting started with KFlop
Ok, so I have several choices but I'm nit sure which path to take yet. I would like to continue down the Kflop path and work out a driver combination that works. Does anyone have any experience/feedback on the 2 most viable options:

1) replace the KL drivers with Geckos - I can return and replace them easily
2) replace the KL drivers with the KStep - this might actually be the less $ solution to drive my two 5A steppers. A bit overkill with 4 drivers but would enable a tool changer or some other upgrade in the future

I'm not too thrilled about spending time checking if the KL drivers might work. Time is a premium for me and I'd rather spend it moving forward, not experimenting!

regards,
Michael
Group: DynoMotion Message: 10238 From: Tom Kerekes Date: 10/3/2014
Subject: Re: Just getting started with KFlop
Hi Michael,

This question often comes up and like I've said before I think it comes down to what is your primary objective. 

The Geckos are hands down the higher performance drives permitting higher voltage and with better anti-resonance features that will likely permit higher top end speeds.

KSTEP provides a smaller more integrated package with less wiring, more efficient FETS (no heat sinking required), higher 16X microstepping for higher resolution and smoother low speed motion, on-board voltage clamping (allows use of smaller switching power supplies without big caps to absorb regenerative braking energy), no tuning pots, includes (16) 24V Opto inputs, 2 relay drivers, an analog output, and at lower cost. 

HTH
Regards
TK

Group: DynoMotion Message: 10239 From: Michael Hackney Date: 10/3/2014
Subject: Re: Just getting started with KFlop
Thanks Tom, this is a pretty basic 2 axis 10x22 lathe that I don't expect to operate at extreme performance. It just needs to be reliable. The drivers I had with a parallel port BOB would have been absolutely fine for this machine. The primary reason I didn't just go down that path - where I have a lot of experience with my other machines - was to try something new that is more aligned with where the small production controller world is heading. Parallel ports are a dinosaur and doing machine control on a general purpose PC is problematic. So this was to be a relatively simple opportunity to do something new for learning purposes, but it does need to work!

regards,
Michael



On Oct 3, 2014, at 12:18 PM, Tom Kerekes tk@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:


Hi Michael,

This question often comes up and like I've said before I think it comes down to what is your primary objective.  

The Geckos are hands down the higher performance drives permitting higher voltage and with better anti-resonance features that will likely permit higher top end speeds.

KSTEP provides a smaller more integrated package with less wiring, more efficient FETS (no heat sinking required), higher 16X microstepping for higher resolution and smoother low speed motion, on-board voltage clamping (allows use of smaller switching power supplies without big caps to absorb regenerative braking energy), no tuning pots, includes (16) 24V Opto inputs, 2 relay drivers, an analog output, and at lower cost. 

HTH
Regards
TK

Group: DynoMotion Message: 10242 From: mljh Date: 10/3/2014
Subject: Re: Just getting started with KFlop
Ok, after careful thought and discussion I've decided to move forward and order a KStep. You have the order Tom, this should be a lot more convenient for me!

cheers,
Michael