Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: kocher on December 17, 2010, 05:04:15 PM
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hi, can anyone explane please after i put gcode into mach3 itis always reads wrong size ex if i want square 1in it engraving it gos to 0.940 so i have to creat square 1.325 in till i get 1 square inch i need your advise please
T1M6
G0Z1.0000
G0X0.0000Y0.0000S15000M3
G0X0.0121Y0.0202Z1.0000
G1Z0.0000F9.4
G1X1.3371Y0.0202F14.2
Y1.3452
X0.0121
Y0.0202
G0Z1.0000
G0X0.0000Y0.0000
G0Z1.0000
G0X0Y0
M30
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If you command a 1 inch move via the MDI line does it actually move 1 inch?
Hood
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no if i command a 1 in it will be 0.740 . thank hood for your help.
T1M6
G0Z1.0000
G0X0.0000Y0.0000S15000M3
G0X0.0163Y0.0198Z1.0000
G1Z-0.0250F9.4
G1X1.0163Y0.0198F14.2
Y1.0198
X0.0163
Y0.0198
G1Z-0.0500F9.4
G1X1.0163Y0.0198F14.2
Y1.0198
X0.0163
Y0.0198
G1Z-0.0750F9.4
G1X1.0163Y0.0198F14.2
Y1.0198
X0.0163
Y0.0198
G1Z-0.1000F9.4
G1X1.0163Y0.0198F14.2
Y1.0198
X0.0163
Y0.0198
G0Z1.0000
G0X0.0000Y0.0000
G0Z1.0000
G0X0Y0
M30
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Then it sounds like you have your steps per unit set wrong.
If you tell me the following info I will work out what your steps per unit should be
Is it steppers?
What microstepping do your drives have? (or make/model if you are not sure)
Do you have any reduction between motor and screw?
What is the TPI or pitch of the screw?
Hood
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the steppers are direct drive. (helical couplers )
high-precision linear Round rails, diameter 0.8-inch,
The use of high-precision new ball screw,
there is no rebound in return; diameter 16 mm; pitch 10 mm;
Aluminum alloy T-slot table, Can help you cut and fixed,
Manufacture than wood table has a huge advantage,
NEMA23 stepper motor current is 3A, the weight 2.2 pounds ,Torque 1.7n.m 245 oz.In.
30v 3A CNC drive,tb6560 , Optical isolation, the maximum 1 / 16 micro-step,Spindle control relay
400w 30v Switching Power Supply
spindle motor is 850w, 4 level speed, 5000--30000RPM, Strong power;
milling tool diameter: 8mm,6mm,3.175mm
Router is the length of 28 inches, width
thanks for your answer
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Do you know the microstepping you have the drives set to, it says there that Max is 1/16, is that what you have it set at?
Are your native units inch?
Hood
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sorry all i know u did help me to run my machine in past i have this info it may help again thanks for your advise . steps per 760 .velocity 151.98. Acceleration 4. step pulse0 dir pulse 0 .
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Ok can you attach your xml and I may be able to work it out from there. With the steps per unit at 760 it would mean from the above info that you are just 1.49 microstepping which doesnt sound right.
Hood
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Ok looking at your numbers I am thinking you are at 1/2 stepping so your steps per unit would be 1016, give that a try and see.
Hood
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i did put 1016 per step its working perfect size thank very much it is working 100% thank you .
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Ok, glad to hear it :)
Hood
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It looks like I have the same problem! I got this CNC set it up and run the program but it is cutting backward (mirror) and it is cutting really really small. I attached some information might be helpful to someone wants to help me. Thanks
The use of high-precision ball screw:diameter 16 mm; pitch 10 mm;
Router is the length of 50 inches, width is 33 inches, 120cm 84cm
Effective processing distance: X = 40 inches,Y = 24 inches, Z = 5 inches (100cm 60CM 12CM)；
NEMA23（Y-Z-A) and NEMA34（X) 3A stepper motor ；Maximum engraving speed of 6 M / min;
30v 3A CNC drive
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Info that is needed is
Stepper motor or servo, you already said stepper so thats fine.
Pitch of screw, which you have already said so again thats fine.
Native units you will use, you have a mix of metric and imperial in your description but likely it will be metric as you mention a cutting speed of metric units.
So info still needed is
Drives microstepping amount ????????
Reduction between Motor and Screw?????????????????
Hood
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Hi Mr. Hood,
I set up the Native units in inches.
I have the info on the link [http://www.icesculpturepro.com/mach3-6-2.JPG] what numbers I copied (Steps per,velocity/acceleration) from the screen shot. I guess where all my problems coming from sorry I'm newbie on this. Thanks for your help..
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Assuming you have no reduction between motor and screw then your steps per unit should be set to 4064 steps per unit. The Velocity you could try at 315 and accel try at 20 and see how it goes. If the motors stall then reduce the Velocity and Accel by half and then increase the Accel slowly until it stalls then back off the do the same wit the Vel.
Hood
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Thanks Hood it is running okay now, but when I load the G-code, Mach 3 is not loading all the g-code and the tool path is not complete in the mach3 screen. I tried my code in the other machine and it is all fine. Can you help me with this one. Thanks again.
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You are in demo mode, ie no licence file in the Mach3 folder.
Hood
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Ok. thats what it is, Thanks I'll get a license then..
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Mr. Hood, I upgraded my z axis from 6" to 12" processing distance. Now I have lead screw
KERK Brand Anti-Backlash Nuts on all axis
-0.1 pitch lead screws. Standard (Feed rate of 150 inch per minute)
-Kerk(TM) Nut
+ Resolution .0005"
+ No load backlash .0005"
+ Double End Support.
Nema23 Stepper motor 1/8 microstep.
Thanks for your help....
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Mr. Hood, I upgraded my z axis from 6" to 12" processing distance. Now I have lead screw
KERK Brand Anti-Backlash Nuts on all axis
-0.1 pitch lead screws. Standard (Feed rate of 150 inch per minute)
-Kerk(TM) Nut
+ Resolution .0005"
+ No load backlash .0005"
+ Double End Support.
Nema23 Stepper motor 1/8 microstep.
Can you help me with the right motor setting with this one.
Thanks for your help....
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Steps per unit will be 200 x 8 x 10 = 16,000 steps per inch.
Hood
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Hood,
Thank you very much.. it works well.