PM727M Mach3 Steps and Backlach compensation Setup
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- Опубликовано: 14 окт 2024
- PM-727M CNC Conversion Series
In this video I go step by step in Mach3 showing you How a setup my steps per inch and check the Backlash . I like to get in the ballpark then fine tune from there.
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!
Check out Steve's Backlash and Gibb adjustment video:
• Backlash and Gibb adju...
Steve ( Jumps42009) does a really great job explaining the forces behind Backlash and Why.
In the next video PM-727M CNC Spindle Setup.
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Sir
You are amazing..!! You are the one who inspired me the most. I even have a confidence to build CNC Router with DSP Controler and mach3. I dont know how it turns out..!
Thank you.
Thx very much for in-depth and neatly explaining ....
Glad it was helpful!
@@CNC4XR7 indeed ✌️
Excellent video, I knew how to establish backlash but never corrected it with Mach 3, cheers for uploading this, wish I had this amount of ready info on my first build many years ago
Glad it helped!
I just wanted to thank you for documenting everything you've done and explaining it. I hope to follow in your footsteps in the next year or so and your work will make my conversion so much easier. Thanks again for doing the heavy lifting :)
Your welcome by then I should have it complete and all the bugs worked out.
Thank you for a great explanation, also thank you for the comments below regarding the shuttle speed (0.005) and backlash speed (100%). My CNC has never been so accurate!
Your welcome happy to help!
excellent video , mach 3 is soo well planned its amazing.. Just dialed my cnc after watching this
Awesome Happy it was helpful!
Sam, I would suggest doing your steps per using a level type .0005" I dictator and a 6" ground plate such as 2-4-6 block so that you have less error and remove the possibility of the indicator you are using not being perfectly parallel which would give a false distance reading.
Thanks
Yeah I think it's pretty close I'm still fiddling with it I haven't really got it dialed in I'll try a couple 123 blocks back to back.
Cordial greeting.
Masterful explanation !!
A concern:
When you open Mach3 and place the units in millimeters (mm), the configuration you have described is eliminated, it remains only for inches (in) or Mach3 makes the appropriate adjustments to be able to work in millimeters.
Thank you for your attention and valuable response.
Blessings in these difficult times.
Mach3 3 does the converting for you. Yes
Looks good Sam. I don't like the hesitation much, but it might be related to the speed and acceleration settings. You might be able to fine tune that out in time with different settings. I think there might be one on how quickly you want the backlash comp applied (or something like that), I'll see if I can find it again.
Yes there is and I found it it's Shuttle accel set to.005
Thanks
That's the one! I hope that smooths it out for you.
I got my steppers and ball screws installed, progress! Waiting on power supplies to finish control box!! It seems to me that my mill and your mill has about .040" difference in hole locations and some small casting differences. Not too bad for mass produced small milling machine I guess. shims will take care of differences, for now.
That's great ! Wyatt if you happen to have made a tracing I would love to get a photo copy.
Be safe
Sam
Hi Sam. Great info as usual. I have a bf20l converted to CNC with ball screws ecc... I have adjust the steps as you recommended and backlash. All is good but on the Z the backlash is big like 0.155mm (like 0.006"). I see you also have quite significant backlash there. What did you do at the end? Becasue the weight of the Z should remove backlash when you go down anyway. I have a air strut at the back to remove a big of tension from the ball screw but the weight of the head is still a bit negative so it apply a downward force to ensure the pressure.
I have run some tests and indeed, without backlash compensation on the Z, going towards the table after have lifted the head several time brings back to 0.
Of I activate the backlash compensation for 0.006" it can reach a value close to 0 also going upwards (positive).
I can not think where it can be important but I was wondering what did you ended up doing for the Z, if remove backlash comp for it or kept it.
Thanks a lot!
Ale
for the z it has not been much of a issue. as there is always weight applied.
@@CNC4XR7 Do you mena that you set the backlash compensation to 0 for Z? Because I am wondering in case you run a 4th axis toolpath or 3D one. Then you cut also going upwards. Then the backlash will play a role in that case.
@@Ale_Lab I went to double check as I have went trough the machine a couple times since this video aired.the last time when I installed the ClearPath servos. I currently have it set to 0.0015 and I do not yet do any exotic cutting with a 4th axis it is enabled. You did not mention the type bearings your using ? AC or TR however you can try to increase the preload to tighten it up a bit. also dbl check other mechanical connections that be potential causes of backlash.
@@CNC4XR7 thanks a lot Sam. I use AC bearings on the axis. On X and Y I have 0.029mm (0.0011") backlash. I am pretty sure it's all tight already. To me must be the ball bearing coupler that might have a bit of slope in the design). Good that you got it down to 0.0015". Just finished to relog all the 28 tools. For the moment with backlash compensation seems to run pretty well. I will make a part and check.
backlash is not working. there is no reaction. as if no digits were entered. what could be the problem?
Try a reboot and also try a large number like 20 mm
@@CNC4XR7 I found the problem. I am using " rnr motion card " . The card does not support this feature. thanks for everything. 🙏🙏
Hi, I use DT860T driver with a NEMA 34 motors and use 2505 ball screws. Can you share which DIP switches you have turned on. Thanks
different for All
Excellent!
Many thanks!
Sir.. can you help with fixing a problem in my cnc that has to do with mach3 setup?
Send me a email
Could you tell us what are those white tubes and connector on front side for air or for what and for what reasons are there? Thank you!
One Shot Oiler Lines
Is this necessary?
No, But it does help keep your machine well oiled.
Could you show us (on video or link of item) what system do you use? Im interested in this.
I have a video In the PM727M conversion series One Shot oiler has all the parts used.
Using shuttle acc 0.005 with backlash 100% my x axis jerks a bit what do i do to get rid of this problem plz help
well if you increase the delay it will not jerk but the backlash transition is slower Steppers do this and sometimes make a banging sound.
@@CNC4XR7 how to inc the delay?
@@asharnadeem5558 config/ general config top right
MDI commands do not move table after setting up, would this be wrong motor tuning? cheers
you did not specify what your typing in? try G0 x 1.0 Also does the machine move with the jog buttons? Do you have home switches installed? if not try homing the machine first.
@@CNC4XR7 was working fine till computer crash and another hard drive installed reloaded and set up Mach3 again but cannot get it to go like it was before axis move with buttons ok jog seems to be going ok but MDI commands do not move to set up backlash ect even putting in GO x 1.0 it may move .010 cheers
no home switches installed
@@Rocky5738 ok make sure its G0 (zero) not O
@@Rocky5738 you will still need to reference the machine.
also, I noticed you had backlash comp on the z axis,be careful with that, if your head floats it will automatically settle and the backlash will become an error.
Yeah the z seems to be the worst one the weight is the side I think. Also it may be the plum couplings I'm using. More testing is needed.
good video.. but for a mill or lathe you need to use a 10s indicator , just so you can set it for the 10 lines between the thousands marks. to a good machinist 0.0005 is close . lol..
Yes, you are right.
Thx
No problem
Ok try this Change the Backlash speed to 100% and the shuttle accel to .005 seconds this will get rid of that delay.
Thanks yeah I found out about shuttle accel.
I did have it to 100% that did not seem to so anything
Will see when I run code.