China cnc controller “scale” ratio issue

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JP foodtrucks
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China cnc controller “scale” ratio issue

Post by JP foodtrucks » Thu Mar 21, 2019 9:58 am

We currently have a Chinese plasma cutting machine controller, table, and torch with a model number of SH-2012AH-QG, “Unich” LXP1325, hau rong welding LGK7-63 respectively.

I am having trouble making the cnc controller output cuts to the desired 1:1 unit scale.

additional facts that may help understanding the problem;

-When cutting a test line of 94in (2387.6mm) the table controller requires a "scale" value of approximately .338 to produce a true metal cut length of 94in (2387.6mm)
-With the .338 "scale" value selected the travel value in the machine controller is reflects 31.77in (807mm)
-The Cam software is FastCam v7, using the "start" post-control-processor during computer installation
-Upon use the table, controller is reset to factory parameters using "GG3" on the start screen.
-The microstep THC is working well and the plasma machine is striking an arc and cutting through metal with proper height control creating a good finish.
- the “golden ratio” of .338 is producing parts close to tolerance (~.250)
I know support isn’t great for these machines and Im awaiting a return email from the microstep control manufacturer.

Anyone shed some light on my problem?

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acourtjester
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Re: China cnc controller “scale” ratio issue

Post by acourtjester » Thu Mar 21, 2019 10:34 am

Your machine is setup in metric, I would look at the software to see if there is a selection between inch and metric. Mach has that if so just change the setting.
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JP foodtrucks
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Re: China cnc controller “scale” ratio issue

Post by JP foodtrucks » Fri Mar 22, 2019 7:08 am

The cnc controller is in metric at the moment but the g code is also in metric. Fastcam puts out code for the “start” post processor control in metric I assume.

Changing the machine to imperial has made no difference, in fact that make the table axes unmovable and a terrible overdrive noise comes from the motors.

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acourtjester
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Re: China cnc controller “scale” ratio issue

Post by acourtjester » Fri Mar 22, 2019 12:28 pm

Ok there is a command in the G-code that states inch or metric, you can look at the g-code to see which is set then find out how to change if needed.
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DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PM 256 tig

tcaudle
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Re: China cnc controller “scale” ratio issue

Post by tcaudle » Fri Mar 22, 2019 12:55 pm

sounds like maybe the steps per unit (calibration) are off. Having to fudge the rationj which should be .3937 is saying its traveing further each step than it should . There should be some way to change the calibration If you want o know what it should be then run a "ruler test". There is a calibration calculator at https://www.candcnc.net/knowledgebase/m ... alculator/.

Go to the Fine Tuning (green ) section . It asks you to unput the steps per unit (in inches or mm) and a test move and then ti will tell you what the new steps value should be . Do it all all of the axis

JP foodtrucks
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Re: China cnc controller “scale” ratio issue

Post by JP foodtrucks » Thu Mar 28, 2019 6:55 am

It was the Numerator/denominator parameters in the system setup of the cnc. That’s how’s the stepping motors are tuned. Thanks all

Daniel Alstott
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Re: China cnc controller “scale” ratio issue

Post by Daniel Alstott » Sat Nov 30, 2019 8:35 am

What did you end up with for your settings just curious

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