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Topics - Randaltb

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1
General Mach Discussion / ok enough stepping, how do I add encoders?
« on: March 11, 2013, 10:37:39 AM »
OK, my RF30 mill moves great with no load but, I am tired of getting %70 through a 25min real job then having the motors skip steps killing $50 worth of stock...
When I use backlash correction it confuses the issue more...

Like I said above, air cutting runs the job fine and going back to 0,0,0 is almost dead on, but add any load and its crap shoot...


Can I add encoders directly to the table?
I would like to:
- Track the X,Y, & Z actual positions via encoders.
- Keep the motors, drivers, and ESS if possible.


I am sort of new to this stuff but not afraid :)
I have, RF30, Mach3, ESS, wanati drivers, wanati steppers. (425 in/labs)
So I assume someone has done this?
Would be great to see video or step-by-step tutorial of this being done...

Thanks for you help.

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General Mach Discussion / Lost at low speeds
« on: March 03, 2013, 01:57:51 AM »
I am new to CNC and Mach3...
I have converted an old RF30 and can't get it stable.
I am not sure if it is in Mach3 or the motors?

My system seems OK at full speed but gets lost at lower speeds.
I read another post with a similar issue but did not see how it was resolved.

So here goes:

If I jog the Y axis 1.00 at %100 ~15 IPM the system seems to be with in .001.
If jog the Y axis 1.00 at %40 ~6 IPM the system is way off, and very inconsistent.
I am not addressing backlash here because it happens moving the same direction, repeatedly.


I did some testing with a dial indicator in the vice jogging at %100 15 IPM.

- Set zero and jog away 1.00 then back within ~ .0005 from where I started.
- Set zero and jog away 3.00 then back within ~ .001  from where I started.
- Set zero and jog .1 ~ .001  from where I started 5 times in a row.

Now turn the jog speed down:

- Jogged .1 three times same direction 1st step off ~.001 2nd step ~.005 3rd step ~.007.

Not sure what going on?
I am pretty sure the motor tuning step counts are close because at high speed it repeats 5 times in a row, but at slow speeds it won't repeat.

Info about my system:
- RF30 Drill Mill.
- Ethernet Smooth Stepper. (added afterwards thinking it would solve the issue...) nope, but it looks cool ;)
- Parallel break out board.
- Wantai DQ542MA Drivers, set at 1000 Pulse/Rev. (Were set at 1600, same issues but worse)
- Wantai 57bygh115-003 Motors. 425 in/oz
- 36 VDC 10A supply.
- Mach3 (Licensed)

Steps taken so far:

- Increases the wire size from power supply to drivers. (In case there were to small)
- Disassembled the Mill X and Y completely, cleaned and reassembled. ( It moves smooth, no binding, with about .008 BL)
- Put a fluke meter on the 36 volts and ran motors. (34VDC +_ .3 all the time)
- Tried setting motor tuning 7-15 IPM and tried acceleration (.5 - 10)

Not sure what to try next.
 ???

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