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Messages - rodjava

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If I understand you correctly for my x axis,
1.0050251 x  6600.500932 (x)= 6633.66910923

I will give it a try. As well as disable backlash

Thank you all in advance.


Hi Tripleback,
Thanks, but I can't seem to wrap my head around your answer.
What do I multiply 1.0050251 with?
I'm sort of dumb.
Can you give me a example?


I build a cnc router with ball screws and nuts from Ebay. Unfortunately, they did not come with any documentation.
I am also running servos with 14bit absolute encoders.

I have calculated my backlash and entered the values in Mach3.

When I calibrate my x and Y axis using Mach3, I have the following values per.  x 6600.500932 any y 6602.946044

When test cut a 3.00 circle, it is 2.9850 in diameter.

What is the formula to increase .015 to make it 3.00 diameter?

Any help would be appreciated.

San Francisco

General Mach Discussion / Re: New 4th axis config
« on: November 20, 2011, 11:41:22 AM »
Hi everybody,
First of all, thank you to everybody that chimed in.

I read the manual for my DMM technology BoB and discovered that if the charge pump is enabled in Mach3, the A axis will not work.
Since I don't have a charge pump anyway, it was a simple fix.

San Francisco

General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 04:38:26 PM »
I sent a message to the maker of my bob for info.
I will report back my findings.

Thanks to every  body for your help.


General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 04:16:44 PM »
Picture of my motor settings

General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 04:11:00 PM »
Yes, I did that but it does not move the servo.
I see it moving only on the screen.

Here are some pics of my setup.

General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 03:52:45 PM »
Good point.
I reviewed all the wiring on the hardware side and everything looked good.

My Bob has 5 available connections for the x,y,z,a and x1
x,y and z are wired correctly.

I originally used the A connection for the 4th axis and this creates the problem I described.

I then switched it to the X1 connection and fired up Mach.

The motor does not turn, which is great.

How can I test the 4th axis by jogging it?

BTW, Thank you for your help


General Mach Discussion / New 4th axis config
« on: November 19, 2011, 02:36:17 PM »
This is my first post.  I normally read through and search for an answer with great results.  However I am stuck with a problem.

I finished building a 4th axis for my home built cnc router. It's all wired up and connected the the A axis on my bob.
I fired up Mach3 and immediately the 4th axis started turning while in the Estop mode.
The 4th axis will only stop after I reset the Estop.

Motor Outputs
A axis settings
Enabled Step Pin#9  Dir Pin #8

I tried the red X mark to disable the Axis, but this had no effect.

Could somebody please guide me in the right direction as far as the correct config?

Thank you all in advance,
San Francisco

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