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### Messages - rodjava

Pages: 1
1
##### General Mach Discussion / Re: How to calculate steps per unit when ball screw values and other info is unkown
« on: October 24, 2012, 03:42:23 PM »
Hood,
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

Rod

2
##### General Mach Discussion / Re: How to calculate steps per unit when ball screw values and other info is unkown
« on: October 24, 2012, 01:29:32 PM »
Hi Tripleback,
What do I multiply 1.0050251 with?
I'm sort of dumb.
Can you give me a example?

Rod

3
##### General Mach Discussion / How to calculate steps per unit when ball screw values and other info is unkown
« on: October 24, 2012, 11:26:04 AM »
Hi,
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.

Rod
San Francisco

4
##### 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.

Rod
San Francisco

5
##### 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.

Rod

6
##### General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 04:16:44 PM »
Picture of my motor settings

7
##### General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 04:11:00 PM »
Hood,
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.

8
##### General Mach Discussion / Re: New 4th axis config
« on: November 19, 2011, 03:52:45 PM »
Fixit,
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

Rod

9
##### General Mach Discussion / New 4th axis config
« on: November 19, 2011, 02:36:17 PM »
Greeting.
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?