Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: wakedabed on February 06, 2015, 03:45:41 AM
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Hello people,
I want to ask if you can help me to detected where is my problem or mistake that cause this vibration and noise at low speed motor?
https://www.youtube.com/watch?v=CvpCPtk-x4Q
Thanks so much!
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Video is set to private.
Hood
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I'm so sorry, please to check now..
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Hello Hood..
Did you have looked to my machine?
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No video... blank screen.
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What is the cause of noise and vibration at low speed? This is my problem. .
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Probably the cheap Chinese stepper drives.
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Did you have a looked at the video?
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Can you adjust the microstepping on the drive? If so what have you got it set to?
Hood
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I didn't know yet how to setup it exactly but I have changed something on it but futility, no good change..
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Wow... something is drastically wrong. :o I would bet the Chinese stepper drive is not setup right or failed. People think they are getting a deal buying a $29 chinese stepper then wonder why the machine runs like crap or spend days trying to figure out how to make it work because there isn't instruction. The machine looks like a package deal to me... if that's the case contact to seller.
Seems the Ebay market is flooded with "package machines complete with electronics"... the sellers buy cheap Chinese components then sell the systems for 1000% markup.
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Try reducing the axis Velocity and Acceleration settings by 50% then test again.
(;-) TP
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If I reduce it by 50% the noise and vibration will be more violence!
When I increase it more then will be more smoothly!
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Do you not have any documentation for the drives?
Is it ok at higher speed?
Hood
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Yes Hood, at high speed its more smoother.
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Here the documentation for the driver
http://www.hobbycncaustralia.com/Instructions/iI7powerTB6560.htm
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when i press the reset button to move the axis, i hear some a small noise in the motor (before to move them) something like there are some electric pulses in the motor!
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That page doesnt seem to give any info about the dip switches other than to say what they are for. Do you have any other info as it could possibly be you are set for full or half step and at slower speeds it may r un a lot better if you increased the microstepping.
Hood
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http://www.ebay.co.uk/itm/3-Axis-TB6560-Stepper-Motor-Driver-Board-Controller-CD-/261726719197?ssPageName=ADME:X:RTQ:GB:1123
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Try setting the dip switches 5 and 6 to Off On to give you 1/8 microstepping. You will need to adjust your steps per unit in Mach accordingly.
Try setting the decay to FAST dips 3 and 4 both On.
Hood
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I have adjusted my steps per unit very well, now i will try to change the dip switches how did you say,,
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Ok Hood, i have put 6 & 5 to off, 1 & 2 & 3 & 4 to on, yes it more smoother now, but i hear noise in the motor when it moving and stoping!
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Put 5 to Off and 6 to On, that will give you 1/8 stepping. You will need to alter your steps per unit in Mach accordingly.
For dip switches 1 and 2 you will need to know the current rating of your steppers and set them to match.
The noise may be nothing to worry about and may be quite normal but make sure the current setting (dips 1 and 2) is correct, if you have it set too high you may kill your steppers.
Hood
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OK Hood, i have adjusting the 5 and 6 and its apear ok, but excuse me i didnt understand you how to know the current rating of my stepper to the dip 1 and 2?
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and in the motor tuning what i need to put in the step/dir pulse?
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You might be seeing resonance. Adding dampers to the motors may make it much smoother.
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ok now its ok, but i can understand why my y axis its ok and more more smoother than x axis? they have the same pinions and racks and dip switches setting!
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Assuming the motors are the same then it could simply be the mass of the axis is different and thus causing issues.
Hood
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Excuse me Hood, but it's a normal thing that the axis be different mass in every table!
I didn't know what to do now! I can't know where is the problem! Or on this Chinese driver or on motor or I need to change my system to be with drivers motor! Or with my racks and pinions :S
How I see and feel, my problem will be resolved just if I connect the motors to drivers!
What you think mr. Hood?
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Yes it is normal for axes to be different and as such you may require different motors or drive setups on each axis, all depends on how different they are.
You may just need to alter the decay as I have heard that some motors need the settings different from others.
The main issue is likely that the Chinese drives are not the best so you may have to mess around to get the best you can out of them. Lots of people have given up and gone with G504s and say the difference is amazing but if you can get a satisfactory result with what you have then all is good.
Hood
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Ok Hood, I don't know how to thank you about this amazing information.
I want to bay the drivers motor but I need you to help me which driver to choice for my motors..
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First thing I would do is exhaust all possibilities of it being a mechanical or motor issue.
I would firstly swap the motors and see if the same axis has the issue or if it changes. If it changes then it is your motor.
Next I would swap the assignment in Mach around so that X is set to the pins you have currently for Y and vice versa. If the problem stays withthe same physical axis then it is almost certainly a drive issue.
If going down the new driver route then for your setup I don't think you can go far wrong with a G504 Gecko.
Hood
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As most have found out including myself, Gecko 540 is the way to go. Made in America, quality parts, great customer support including a real phone number and a website with a ton of information.
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oops yes G540 and not 504 as I said above ::)
Hood
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So nice people about this information! How i saw on youtube and other source information about this driver, i can say it's the best driver around world! But it's so expensive specially for me in the beigging!
I have found other driver on Ebay that appear to me it's a good! Please people, have a look to see it, may be there are something that i didnt know about it before to purshase it!
http://www.ebay.com/itm/400858402049
Thanks you so much!
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Chinese again, may be ok, may be scrap. You pay your money you take your chance.
Having said that the stepper drives look like the leadshine drives which are normally good but again it is as above.
Hood
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Hmm correct!
Thank you so much Hood!
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For a few dollars more get a Gecko 540 or Leadshine... as Hood said Chinese is still Chinese. We've all been burned by the Chinese bug thinking we got a deal. I had a bad digital input connector terminal plug, the tightening screw was stripped, on my Gecko 540. Call Gecko's toll free number talked to girl that spoke English and two days later had a new one in hand, no charge.
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Hello people,
Can someone explain to me what it's exactly the option of step pulse and dir pulse? Excuse me but I yet beginner on the mach3 :S
Thanks so much!
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From the manual .............
Most drives will work well with a 1 microsecond minimum pulse width. If you have
problems with the test moves (e.g. motor seems too noisy) first check that your step pulses
are not inverted (by Low active being set incorrectly for Step on the Output Pins tab of Ports
and Pins) then you might try increasing the pulse width to, say, 5 microseconds. The Step
and Direction interface is very simple but, because it "sort of works" when configured
badly, can be difficult to fault-find without being very systematic and/or looking at the
pulses with an oscilloscope.
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I'm gonna make a wild guess that you've got the step signal on active-high when the drive is active-low or vice-versa.
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But when I have to put the active low option on my setup? Because I still hear some noise on my stepper?
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If you drivers are active-low you drive in active-high, the pulse spacings may be off because the pulsing engine only thought the low-to-high transition was the critical point. The high-to-low- transition's timing may not be well controlled. Honestly it's unlikely to be the problem but it's something to check.