Re: [CAD_CAM_EDM_DRO] Re: X- Axis won't do as it's told

I think he already said that even though his other two axes work fine,
those drivers also will not make the X work ... so I conclude it isn't
electronix. Anyone?


At 11:12 PM 5/25/02 -0000, you wrote:

>Richard,
>
>This sounds like a problem that can be solved quickly.
>
>Get a multimeter and set it to DC volts.
>Place the black lead to the PC ground (LPT1 connector shell).
>Place the red lead on the G201 DIRECTION terminal (8).
>Command a CW move for the axis.
>Write down the voltmeter reading.
>Command a CCW move.
>Write down the voltmeter reading.
>
>One reading must be 0.5VDC or less. The other reading must be 4.5VDC
>or more.
>
>Now place the red lead on the G201 terminal 10.
>Write down the voltmeter reading.
>
>This reading must be between 4.75VDC and 5.25VDC.
>
>If the first set of readings are wrong, you have a problem with the
>parallel port. If the second reading is incorrect, you have a problem
>with the PC power supply. If all readings are correct, reply and we
>will try something else.
>
>You didn't say if you are using a G210 or a G201.
>
>If it is a G210, are you running the input option header settings
>as "common ground"? That can be a problem with weak motherboard LPT1
>line drivers. Switch to "common +5VDC" and things should work OK
>then. Don't forget to take terminal 10 on the G210 to the PC +5VDVC
>(terminal 1 on the game port) when you do that.
>
>Let me know what you find out.
>
>Mariss
>
>--- In CAD_CAM_EDM_DRO@y..., "baccus61" <rich5886@o...> wrote:
>> Hi Gang,
>> I am slowly going bald here as my router has been playing up on
>the
>> X- axis ever since I first built it and I am pulling my hair out at
>> an alarming rate.
>> I am using Gecko drives, 24 volt supply (36v), 20,000uF Cap and all
>> the usual stuff crammed into an old computer case. I have tried
>> Master5 and CNCPro and Kelly Cam with the same results on all
>> programs. This is mark2 of the control box as I thought I may have
>> been getting extraneous RF pulses through the circuit causing it to
>> malfunction. I had sheilded the control cables with Al foil and
>> earthed them at one end without any effect.
>> My problem is that the X-Axis is very unstable and has a mind of
>> it's own when it comes to the direction I want it to go. Sometimes
>> it goes right then all of a sudden it goes left and may go that way
>a
>> few times then back in the right direction. I had it running
>> smoothly 2 days ago and thought I had tweeked it the right way but
>> the next day upon startup it behaved erratically and roughly again
>> with no intervention on my part. I have tried to slow the pulses
>down
>> and also set the acceleration to heaps of different values.
>> I am now on my 3rd motor as I have tried 3 size 23 1.8deg
>different
>> value steppers 4 wire and 6 wire and I am now using a size 32 2deg
>> stepper. ( my last as I burnt the last 2 out trying different
>values
>> for the resisters)
>> My router has linear bearings on round bar and 3 start 3/8 acme
>> teflon coated screws with plastic nuts and runs very smoothly when
>> turned by hand with no power on and very little friction so I am
>> positive it isn't mechanical.
>> The Y and Z axis run very smoothly and I have tried swapping
>wires
>> around using the drive of another axis but still have the same
>> problem. Even went to gearing the drive down with toothed belts
>> about 3 to 1 for more power. I am nearly convinced that I am doing
>> something wrong with the speed and acceleration settings in the
>> software but nothing I try seemes to work. Should I uninstall
>> everything and reload the Progs from scratch?
>> Before I fitted the 32 stepper I had a vexter 1.8deg 4V 1.4A 4
>wire
>> motor fitted which ran very smoothly but I always lost a heap of
>> steps when doing a project. Sometimes 0.020 in an inch but mostly
>> just enough to cut out the side of letters when cutting a sign. It
>> was always smooth going right but lost steps when travelling left.
>(I
>> even tried turning my nut around to face the other way). That is
>why
>> I went to the larger motor for a bit more grunt just incase things
>> were too heavy for it but the problems seems to have worsened.
>(very
>> stuttery and unsmooth)
>> I hope I have given you enough info as I am getting a churning
>> feeling in my guts and the 14lb "linear rectifier" is sitting next
>to
>> the router for some serious tweeking should I not be able to work
>> things out. This has been going on for 4 months and I can't seem
>to
>> find anything in this list that has helped yet and I have scoured
>it
>> nearly every night in that time. This list has been a godsend for
>> building my machine and it is so frustrating to be so close yet so
>> far so I hope an angel is out there watching over me that can help.
>> Warm regards
>> Richard.
>
>
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Regards, Hoyt


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