Thanks for making and posting these videos. I am working on converting my PM728-VT as well. I am a little bit behind you so I am learning from your experience. I just finished the wiring diagram for the control cabinet & rest of the system. Motors, drives, power supplies, Acorn board are all here and bench tested. Still waiting for PM ball screw kit and spindle isolation board. Hopefully those will be here soon and I can bolt it all up and test complete system. I am willing to share my drawings with others once I have built/verified them.
I have a servo powered cnc router 4x4ft. I am trying to install a spindle and I tried a vfd 2.2kw and there was so much noise it would activate my servos as soon as I would turn it on, so would this acorn device help mitigate emi noise? I am going to try a 48v dc setup to see if it is any better.
I was reading the manual for that converter board. A built-in power supply enables the KBSI-240D to be controlled with a 5KΩ remote potentiometer (connect potentiometer to terminals “P1,” “5” and “6” - see page 9). The potentiometer can also be wired for Auto/Manual Operation. *The input range of 0 - 25V is the maximum voltage that can be applied to terminals “5” and “6”. The minimum input voltage is 0 - 5 volts, which can achieve an output voltage of 0 - 10 volts. The unit is factory calibrated so that a 0 - 10 Volts DC input yields a 0 - 10 Volts DC output. Question is if the input voltage is 0 to 5 volts DC is the voltage across the output 9 and 10 going to be 0 to 5 volts to match your factory speed controller ( IA terminal) and Ground terminal. Those little blue trimmer pots adjust the input and output voltages for Minimum and Maximum voltage levels. Here the manual I understand it's meanings from years of electronic work. The centroid is 0 to 10 volts output so it will have to be set lower on the KBSI output to 0 to 5 volts because that is what the speed control is using. acim.nidec.com/drives/kbelectronics/-/media/kbelectronics/documents/dc-drives/manuals/kbsi_manual.ashx?la=en
@Franko did you ever setup a way to add add the encoder to machine? i see on the docs you listed it was only to hook it up to your lathe. ive been looking almost a year for how to control the dc motor with acorn XD i see the encoder is only needed for tapping but thats still a good feather to have. do you have anymore docs or a video on how you did this?
Franco, great video library. Educational and informative. Have you been able to complete this CBC conversion? If so, would you be able to show it’s performance and discuss your lessons learned thru the process? I am planning on doing the same soon. Thx, keep crushing it!
I'm working on the pm-25mv conversion and found out there's a serious safety concern here. The signal ground on these PM BLDC driver boards are NOT floated at all. It carries 120v ac compared to the neutral and ground wire. That's why you blew up the old board with the alligator clip and a signal isolation method is a must. So treat the spindle control cable as the high voltage wire and be really careful when dealing with the spindle signal. I'm thinking about using an isolation transformer to supply power to the BLDC driver boards in order to add another layer of safety in addition to the kbsi-240d and relays.
I actually spoke with someone from Precision Matthews and they are going to have a spindle control board that should be coming out soon on their website for the PM-728VT. They said it will have a standard VFD style input of 0-10V.
Another nice video Franco.... I noticed you you connected the forward/reverse of the motor to outputs 1 and output 2 on the Acorn board. Did you have to tell Acorn that these outputs were being used to control the spindle or are the factory defaults?
Thanks. I think those are the default settings. But, whether they are or not really doesn't matter - it's really easy to adjust all of the input/output settings with the Wizard.
I am new to Cnc machines and I want to do a retro-fit on a counter top 3 Axis cnc with dc motor with encoders . Would you know if an centroid acorn 4axies control board would be the right one . Appreciate any help .
Franco, my EMO controls a contactor that removes power for the spindle control board and all 3 axis drives. The 24v supply to the Acorn board is separate and remains on. I do have my spindle board mounted in the same enclosure as the axis drives though, not on the head.
Very nice as always. I'm going to compare how I ran everything on my mill to yours. I get this weird thing at the end of my run cycle where the mill will stop the rpm then reverse direction just for a brief second then shutdown. I'm not sure if it's in the g code from fusion or a hardware thing. I'm curious what you come up for the encoder mounting.
The most important thing I want to see is the actually wiring of the controlls cabinet & the wiring of the encoder to the spindles motor into the Acorn boarad with all the fuses & step down & step up transformers to power the spindle motor. I have not seen any video of this sort laying out all the wiring . Any help would be appreciated.
Hi Franco, You directed me to this video from your Sherline lathe video. I have watched this video and looked at the wiring diagram. How does this apply to a Sherline motor control board? Where do the wires from the relay go on the sherline control board. Any assistance would be appreciated.
Check this out: sherline.com/wp-content/uploads/2016/01/reversing_inst.pdf You can use the Centroid Acorn Relays to replace the manual DPDT switch shown in the instructions.
Great video as usual... I'm looking to do this on my PM-30. I think the only difference is 240V vs 120V. Mounting the encoder is still a head scratcher of course!
Franco, thanks for another great informational video. Wade - Airdog77 , I am in the process of converting my PM-30 right now and am going to be doing this setup by Franco. I think I figured out that how to mount the Omron encoder. I plan on mounting it with a bracket so that the encoder spindle is at same height as the spindle spring cup. I purchased two aluminum 40T XL pulleys off Amazon, but you can find them on ebay also. I also have installed the Priest power drawbar which I think I can modify the aluminum mounting block that mounts to top side of head and mount the encoder bracket to that. I plan on boring the one pulley to fit around the Spring cup. I think the set screws will hold the pulley onto the cup. It doesn’t seam to slip when holding the cup and turning the spindle. If the cup winds up spinning I will just run a screw though pulley into top drive pulley on spindle.
@@csxal Excellent. Thanks for sharing your solution! I've been strongly thinking about mounting the encoder at one of the top front corners and doing very close to what you describe. I was lacking the details at this point, so again, big thanks on that. I've already pulled the trigger and ordered the 40T XL pulleys from Amazon. I'm using the pneumatic impact driver that the Physic Anonymous guys show in their video as an initial PDB as I decide what my long term solution will be. Just to confirm, did you hook the L and N connections on the KBSI-240D to 240V?
![[UA] NAVI vs MOUZ | BO5 | IEM Rio 2024](http://i.ytimg.com/vi/CMBYk0cbGoA/mqdefault.jpg)
Great video. Spindle control is where i am next on my pm-30. I keep coming back to your videos to figure stuff out. Thank you
Thanks for making and posting these videos. I am working on converting my PM728-VT as well. I am a little bit behind you so I am learning from your experience. I just finished the wiring diagram for the control cabinet & rest of the system. Motors, drives, power supplies, Acorn board are all here and bench tested. Still waiting for PM ball screw kit and spindle isolation board. Hopefully those will be here soon and I can bolt it all up and test complete system. I am willing to share my drawings with others once I have built/verified them.
I have a servo powered cnc router 4x4ft. I am trying to install a spindle and I tried a vfd 2.2kw and there was so much noise it would activate my servos as soon as I would turn it on, so would this acorn device help mitigate emi noise? I am going to try a 48v dc setup to see if it is any better.
I was reading the manual for that converter board. A built-in power supply enables the KBSI-240D to be controlled with a 5KΩ remote potentiometer (connect potentiometer to terminals “P1,” “5” and “6” - see page 9). The potentiometer can also be wired for Auto/Manual Operation.
*The input range of 0 - 25V is the maximum voltage that can be applied to terminals “5” and
“6”. The minimum input voltage is 0 - 5 volts, which can achieve an output voltage of 0 - 10
volts. The unit is factory calibrated so that a 0 - 10 Volts DC input yields a 0 - 10 Volts DC output. Question is if the input voltage is 0 to 5 volts DC is the voltage across the output 9 and 10 going to be 0 to 5 volts to match your factory speed controller ( IA terminal) and Ground terminal. Those little blue trimmer pots adjust the input and output voltages for Minimum and Maximum voltage levels. Here the manual I understand it's meanings from years of electronic work. The centroid is 0 to 10 volts output so it will have to be set lower on the KBSI output to 0 to 5 volts because that is what the speed control is using. acim.nidec.com/drives/kbelectronics/-/media/kbelectronics/documents/dc-drives/manuals/kbsi_manual.ashx?la=en
@Franko did you ever setup a way to add add the encoder to machine? i see on the docs you listed it was only to hook it up to your lathe. ive been looking almost a year for how to control the dc motor with acorn XD i see the encoder is only needed for tapping but thats still a good feather to have. do you have anymore docs or a video on how you did this?
Franco, great video library. Educational and informative. Have you been able to complete this CBC conversion? If so, would you be able to show it’s performance and discuss your lessons learned thru the process? I am planning on doing the same soon. Thx, keep crushing it!
I'm working on the pm-25mv conversion and found out there's a serious safety concern here. The signal ground on these PM BLDC driver boards are NOT floated at all. It carries 120v ac compared to the neutral and ground wire. That's why you blew up the old board with the alligator clip and a signal isolation method is a must. So treat the spindle control cable as the high voltage wire and be really careful when dealing with the spindle signal. I'm thinking about using an isolation transformer to supply power to the BLDC driver boards in order to add another layer of safety in addition to the kbsi-240d and relays.
2 years since the last video on the new milling machine did this project die???
Very nice video. Have you developed a way to mount the encoder to this PM-728?
I actually spoke with someone from Precision Matthews and they are going to have a spindle control board that should be coming out soon on their website for the PM-728VT. They said it will have a standard VFD style input of 0-10V.
This part is out now.
Another nice video Franco.... I noticed you you connected the forward/reverse of the motor to outputs 1 and output 2 on the Acorn board. Did you have to tell Acorn that these outputs were being used to control the spindle or are the factory defaults?
Thanks. I think those are the default settings. But, whether they are or not really doesn't matter - it's really easy to adjust all of the input/output settings with the Wizard.
@@FrancoCNC Thanks!
I am new to Cnc machines and I want to do a retro-fit on a counter top 3 Axis cnc with dc motor with encoders . Would you know if an centroid acorn 4axies control board would be the right one . Appreciate any help .
Franco, my EMO controls a contactor that removes power for the spindle control board and all 3 axis drives. The 24v supply to the Acorn board is separate and remains on. I do have my spindle board mounted in the same enclosure as the axis drives though, not on the head.
Very nice as always. I'm going to compare how I ran everything on my mill to yours. I get this weird thing at the end of my run cycle where the mill will stop the rpm then reverse direction just for a brief second then shutdown. I'm not sure if it's in the g code from fusion or a hardware thing. I'm curious what you come up for the encoder mounting.
I am interested in how you go about hooking the encoder up to your mill.
Thank you for all the videos i need help with wizard set up, you can make a video or tell me the set up you did?
Thank you
Wagner Damotta
The most important thing I want to see is the actually wiring of the controlls cabinet & the wiring of the encoder to the spindles motor into the Acorn boarad with all the fuses & step down & step up transformers to power the spindle motor. I have not seen any video of this sort laying out all the wiring .
Any help would be appreciated.
Hi Franco, You directed me to this video from your Sherline lathe video. I have watched this video and looked at the wiring diagram. How does this apply to a Sherline motor control board? Where do the wires from the relay go on the sherline control board. Any assistance would be appreciated.
Check this out: sherline.com/wp-content/uploads/2016/01/reversing_inst.pdf
You can use the Centroid Acorn Relays to replace the manual DPDT switch shown in the instructions.
@@FrancoCNC Ok will give it a try. Also how did it work out for you?
Great video as usual... I'm looking to do this on my PM-30. I think the only difference is 240V vs 120V. Mounting the encoder is still a head scratcher of course!
Franco, thanks for another great informational video. Wade - Airdog77 , I am in the process of converting my PM-30 right now and am going to be doing this setup by Franco. I think I figured out that how to mount the Omron encoder. I plan on mounting it with a bracket so that the encoder spindle is at same height as the spindle spring cup. I purchased two aluminum 40T XL pulleys off Amazon, but you can find them on ebay also. I also have installed the Priest power drawbar which I think I can modify the aluminum mounting block that mounts to top side of head and mount the encoder bracket to that. I plan on boring the one pulley to fit around the Spring cup. I think the set screws will hold the pulley onto the cup. It doesn’t seam to slip when holding the cup and turning the spindle. If the cup winds up spinning I will just run a screw though pulley into top drive pulley on spindle.
@@csxal Excellent. Thanks for sharing your solution! I've been strongly thinking about mounting the encoder at one of the top front corners and doing very close to what you describe. I was lacking the details at this point, so again, big thanks on that. I've already pulled the trigger and ordered the 40T XL pulleys from Amazon. I'm using the pneumatic impact driver that the Physic Anonymous guys show in their video as an initial PDB as I decide what my long term solution will be. Just to confirm, did you hook the L and N connections on the KBSI-240D to 240V?
Wade - Airdog77 , I’m just powering it with 110
@@csxal Good to know, thx.
Curious you think this would be the same for the PM25MV as far as wiring?
I'd have to look inside the motor control box but I'll bet it's very similar.
That first diagram he posted on a old video works on my pm25mv.
Do you have a link for the diagram?
Thanks
Hi. Look in the description of the video.