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

This sounds as if you could use some more inertia built into the X axis
mechanical drive.


At 03:53 PM 5/25/02 -0000, you 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.
>
>
>
>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto:

aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.

>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this as a

sister site to the CCED group, as many of the same members are there, for
OT subjects, that are not allowed on the CCED list.

>
>
>
>Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
>Moderator: jmelson@... timg@... [Moderator]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>bill,
>List Mom
>List Owner
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>

Regards, Hoyt


Anti-virus request: Please do not add this email addy to address books
Belfab CNC - http://www.freeyellow.com/members/belfab/belfab.html
US Best MC - http://www.freeyellow.com/members/batwings/best.html
Camping/Caving - http://www.freeyellow.com/members/batwings/caving.html
Screw OPEC, drive a motorcycle!