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### Author Topic: Comparing DRO´s in a Brain  (Read 84 times)

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#### corydoras

• 143
##### Comparing DRO´s in a Brain
« on: January 14, 2020, 05:55:52 AM »
In a custom screenset I am using a compare function of an OEM DRO and an axis DRO to set a OEM LED to green if the axis has moved to the correct position (same as the OEM DRo). This is working in most cases, BUT; Sometimes the positioning is just a little off maybe 1/1000 mm. This does not matter , but as this is not an excact equal value in the compare, the led does not turn green. I have good resolution in the motor tuning with approg 600 steps/mm (no deciaml after comma) , so I am not sure why it sometimes calculates off.

My question is; Are there any way of writing a formula in a brain that says something like this;  (A = B +/-0.250) ( I know this is not mathematically correct, but hopefully gets the explanation up front)

In PLC programming it is possible to write a compare block like this: Variable1 < Variable2 + 0.025  AND Variable1 > Variable2 - 0.025 -----> Output

Or, could Mach3 be set up to use lesser digits? ( I think I have read somwhere that there are actually lots more digits in the code of the program, but not more than 4 after comma is shown in the DRO.

Any good suggestion on how to solve this issue is greately appreciated

Best regards
Roy
« Last Edit: January 14, 2020, 06:05:44 AM by corydoras »

#### TPS

• 1,452
##### Re: Comparing DRO´s in a Brain
« Reply #1 on: January 14, 2020, 07:22:58 AM »
here is a small sample

added 0.125 to dro(1300) and stored it in dro(1301)
subtracted 0.125 from dro(1300) and stored it in dro(1302)

then compared both with x-axis dro and result is Led(1300)

not tested just written down
anything is possible, just try it.
if you find some mistakes, in my bad bavarian english,they are yours.

#### corydoras

• 143
##### Re: Comparing DRO´s in a Brain
« Reply #2 on: January 14, 2020, 07:36:08 AM »
Thanks a lot Thomas
That is PLC code alright:)

I will try this out.
BTW, the saw build is coming along well, and phase 2 of the build will include yur genious fingerjoint jig:)

Thanks again

Best reg
Roy

#### corydoras

• 143
##### Re: Comparing DRO´s in a Brain
« Reply #3 on: January 14, 2020, 12:53:12 PM »
Hi Thomas.
The brain worked just as intended. Thank you very much Sir, and have a great afternoon

Best reg
Roy