Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: matthew86 on March 02, 2017, 04:43:42 AM
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Hi guys
I need help please, im going round in circles.
I have recently built a 1500 x 1000 v slot belt driven 3 axis machine.
I have used the setup function to set the steps and when I tell the axis to move 10mm it does, so I enter that value. it matches on the dro too.
now when I load code to run programme I want to machine a rectangle of 30mm x 10mm and when its machined it both dimensions are off by .5mm
what am I doing wrong?
I am using nema 23 stepper motors 1.8 and I am getting lost
any help would be fantastic
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Did you only set the the steps per over a 10mm distance ??
I would try again using a good steel rule or measure over a long distance say 900mm or more.
Unless it is losing steps but too early to show that i think, it must be calibrated 100% first.
Is this wood router?
Maybe also the tool is 0.25mm off-size, depends how good the tool is but is possible
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hi thanks for you reply.
yes I only did that over 10mm.
I was using a Digital gauge to measure 10mm but like you say perhaps I need to do it over a further distance.
it is a wood router. and the tools im using are very accurate in dimensions as they are actually from a metal cnc machine.
I also have issues when I power the machine up, the y axis judders in one direction when no jogging is pressed, it stops when I jog the x axis. doesn't do this during a programme.
I don't know where im going wrong and I have spent a small fortune getting this machine built
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Its always best to calibrate over the longest distance possible.
Does the axis just "thump" or does it keep moving??
If it thumps and stops thats pretty normal for stepper motors, if it keeps ,moving thats not right.
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it judders and doesn't stop until you press another axis button in jog.
my y axis has 2 motors connected to one driver but one motor in the opposite direction. do you think this may be an issue? does each motor need an independent driver?
if so how would I setup another driver on my control board?
I can get some photos tonight of the electronics and settings
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I also don't know if my current settings are correct on my TB6600 driver
Im using these motors-2305HS280AW-265oz from ooznest
driver settings
1-off
2-on
3-off
4-off
5-off
6-on
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I would not connect two motors to one drive - just sounds like a bad idea *unless* the drive is specified as being capable - i do not know any that are.
What control board do you use - to slave properly you generally need a 4axis board *but* some boards can take two drives on one axis ok.
You would normally have a motor connected to each drive and each drive connected to the break-out board which is then connected to Mach3 and Mach3 is set as slave X&A or Y&A etc
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Thanks
im using the 5 axis breakout board and TB6600 DRIVES, TRYING TO ADD A PICTURE ON HERE TO SHOW YOU. may have to buy another driver and slave it to A as you say
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https://www.youtube.com/watch?v=Mv8mCXMVKUo
this is my setup board and drivers
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I have ordered another driver and will slave it. will do the calibration over a longer distance and let you know if its any different. thanks for your help
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Tried what you said and i can repeat it accurately for movement to 1000mm but when machining again its out by .3mm. This is strange.
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may I kindly ask anyone to write a simple code for a square that measures 50mm x 50mm at 2mm deep with a 6mm endmill, zeroed bottom left corner. may be worth seeing if its a coding error from Artcam when being created
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Try this.
Tweakie.
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thank you sir, will try it later today after work. much appreciated