PM727M Z Axis Working Stepper
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- Опубликовано: 31 янв 2025
- PM-727M CNC Conversion Series
In this video I install My new Z axis stepper motor this is a 3 Phase stepper to replace the Lead shine model 863S68H THAT DOES NOT WORK WITH THE 3DM683 DRIVE.
NEW Motor
JMC 86J12126-650 (920oz.) 3 phase stepper motor
Leadshine 3DM683 drive
JMC equivalent drive 3DM783
I have tried to be as detailed as possible to the point of being informative but not boring. I will try to keep the videos around the 15 minute mark. Please comment and let me know if the content is spot on or you would like more information and details. I will do a complete overview video to conclude the wiring in which I will go thru how the system operates. Thanks for watching , please subscribe, thumbs up if you like the video, and most importantly , Be Safe!
In the next video PM-727M CNC
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Disclaimer. I am not a professional. My videos are intended to
document my progress . I express no warranty as to the accuracy reliability or safety of the information provided here. By using any of the information provided in this video you acknowledge that I am not responsible or liable for injury or damage to property. Electricity is Dangerous proceed with caution follow all local regulations in your area. Visit the website at www.cnc4xr7.com
I'm 84 years old and from the old school I like what you are doing but I can't keep up with you. Model Engineering is a far bit different now with all the electoral gadgets you can fit to your machinery. It's really a good thing if you can understand it thank you for your video. Doug from Australia.
I understand what you mean. I try to be as detailed as possible without putting viewers asleep. LOL
Really loving this series Sam. I feel a little guilty that I am waiting until your done before I start my conversion. Great work with the new motor. By the way, the physical size of the motor has no bearing on the voltage needed to drive it. Motors are all about internal resistance of the winding and the current required to drive them. So, you would have had no idea you had the wrong motor the first time.
Hi David
Thanks I think that is a good idea as I have made a few corrections along the way.
I can't help but feel a little sighted by Leadshine for recommending the 3DM683 drive for that motor there's know way that that drive will work with that motor.
Be safe Sam
Glad you or back on track, Sam.
If I were you I would definitely feel lazy and not do it but for the sake of curiosity or for folks who will do their conversions, maybe you can try putting one of the smaller steppers back on Z to see how fast they can run. I have a hunch they wont have any problem doing 140. Cheers.
I will probably disassemble the thing once more and I will test it then.
Awesome work! All these videos provide a great reference and motivation to convert my MMD46.
Appreciate it. :)
Thank you!
Hey !!! glad to seee you back in business business !!! :))
Manny
Thanks,
Well I am running now fine tuning , I'm waiting on the enclosure before final adjustments.
great job! cant wait to see that thing making some chips!
any plans for releasing a kit for the pm727m or a spec sheet for ordering parts ?
Once the basic build is complete I will offer the Fusion 360 files for those interested. I'm trying to make sure as much as possible things are correct. There are minor changes here and there.
Keep on keeping on!
G
Will do
Hi, great job!
I'm converting a milling machine similar to yours, a little bigger,
I was just undecided about the engines, you with that 920oz stepper, you can reach those speeds, but the lead screw, what's the lead?
5mm pitch. I would not recommend these steppers If you have to use steppers go with closed loop or better yet servos. Double the rapids
@@CNC4XR7 even i have 5mm pitch. Yes, I agree, I was undecided between closed loop stepper motors and servo motors, I'll ask you another question in the clearpath video, I'm very interested in your goals because we have practically the same machine with the same screw configuration, thanks a lot for the answer.
@@CNC4XR7 Thanks for the answer, I also have 5mm pitch, you have convinced me, I hope not to overdo it but i will put 12Nm Nema 34 on all the axis! hehe
Love the videos.
Whats the brand/model on that nice touch screen you have there?
Its a Older 17" ELO touchscreen I picked up off Ebay cheap it 's used but no pad spots and for the shop is great.
Look around you can find deals.
I would take advantage of that flat on the shaft and add a set screw, nothing worse then the clamp style slipping and running parts, went through that early on my first conversion and was not happy.
As for speed on the Z axis, I would leave it at 100ipm. when you start doing high speed peck drilling especially on deep holes, there is some drag on the retract that may be enough to stall it and again will be an unfortunate situation. 100ipm is plenty fast unless you plan on doing alot of 3D machining at which point you will have some long machining times. still it would be OK though.
for the oiling drain out, use your lathe and make some simple low cracking pressure valves, just need a nap bearing, spring and a little bit of hex stock. a quick search on Google will give you some design ideas. very easy to make and will stop the gravity drain issue. you also are probably seeing some flow distribution variances that a metering valve setup would help with making more uniform per pump to the different locations. tuning those can be a bit of a chore, but once set should not need much adjustment afterwards.
hope that helps!
Yeah a set screw may be needed,
I think the Z axis will be fine I Have 30% extra for Pecking I feel like that will be fine.
For the oiler Thats the plan just to make some spring loaded check valves.
LOL ... Need a spare z axis stepper? ... I have one . If I understand correctly the X and Y steppers you spec'd have plenty of power ?
Yeah I think they will do just fine a 3 phase stepper by design has almost double the torque of a bipolar motor. But the JMC big motor is working great and is cheaper than the Leadshine X Y motor.
how many mm per motor revolution is on this machine and how fast is the motor rotating at 100ipm?
Motor rotates at 508 rpm at 100ipm or 2540mm per min.
thanks for the info. would you know how much does the vertical head weight? so basically you can travel only 42mm/s with 4Nm torque? I guess I'll need bigger servos :)
The Head weighs 100lbs but I will be adding another 25lbs soon (PDB)
Have you considered adding gas struts to the column and head to help assist the Z motor in lifting the head? It might eliminate the stall on the Z up @ 140 IPM. I know you mentioned that 140 was not a goal but just a suggestion for those you may want that speed.
Thanks,
Yes I do plan on some sort of assistance with the Z axis, Most likely Gas struts they work really well on the X2.
At the Moment I'm at 100lbs with the Gearbox , motor. I plan on a belt drive, PDB to replace the gearbox i dont know where the brackets will be or what the final weight will be so I'm going to wait on that for the moment. I suspect the weight will be about the same or really close.
Be Safe,
Sam
have you made free prints/ files for the cnc conversion, for anyone interested?
Free No, But plans are available @ www.cnc4xr7.com