shopsabre Accuracy

[ro7all]

hi, i have a new shopsabre, 4x8 , and i am not able to get it to make identical parts,such as large triangles. i have tried just using the vaccum holddown, and tried screwing down each area, variuos cutting profiles ,speeds feeds, etc.

any help and ideas?

[todd71]

Did you get this resolved?

[ro7all]

not totally yet, the guys at SS have been trying to help resolve the problems and have guided me through some procedures to fine tune the servos, and it has gotten much better,but it is still not right yet. they have been very helpful and feel that they are truly trying to help.

[todd71]

Got any pictures of the parts?

[KustomKoncepts]

My new SS the gantry is cocked and not true with over 1/8" off from side to side so it can't cut a square either to save its life they are just entry level machines

[ro7all]

no not yet, now i am having other issues also , the digitizer keeps getting PROBE STOCK ,spindle motor slows downs and speeds by itself...
still haven't resolve the part issue, all i was trying to do was large triangles for a corner cabinet.

[todd71]

Originally Posted by KustomKoncepts My new SS the gantry is cocked and not true with over 1/8" off from side to side so it can't cut a square either to save its life they are just entry level machines

Does the tool changer even work being so far off? It maybe an entry level machine. But it should be better than that.
I'm getting +/- .003 on all dimensions 35-125ipm(.062-.500 dia tooling) +/-.006 65-225ipm(.125-.500 dia tooling) When we first assembled the machine we had issues as well. Once we got the indicators out and trued things up, torqued things down and trammed the spindle in most the problems were resolved. I still needed tech support to get the servos dialed in. And I also had to adjusted the backlash comp in WinCNC. Was cutting circles.020 out of round. This adjustment also made the corner transitions smoother. I'm not trying to blame you or excuse SS. If it is a verifiable defect in their manufacturing process they need to fix it.
As for the varying spindle rpm you may have a bad ground or are getting electromagnetic interference. 1st thing I'd do would be move your VFD as far away from the servo control box as possible. If this doesn't help call Tom 919-767-3824. He works for the VFD manufacture. Cool guy with tons of knowledge about the VFD and its function
Hope this helps. There are solutions. But never settle for less than you paid for. You should at least be able to cut squares and triangles.

[cabnet636]

for an order like that i would purchased the wood milled flat to the best optimizing size, it will be an expense but a savings at the end and allow you to focus on programing and production. good to see you routing jim

[ro7all]

we have done most of the same thing with ours, "trammed the spindle in " what is this?? i can take a full sheet .75x48x96 and try to cut 8 large triangles of exactly same size, and everyone is different, some will have a slight curve leg, angles not the same....

I don't suffer from insanity. I enjoy every minute

[todd71]

Are you climb milling or conventional? Tramming the spindle is
basically checking the perpendicularity of the spindle to the table.
Using an indicator with "extended" type holder (see attached images) to swing a 180deg arc across the x (side to side) and y (front to back) axis. Optimal would of course be zero readings all the way around.
Gotta give a shout out to
www.cnccookbook.com
www.cartertools.com
for the pics.

[ro7all]

thanks , great explantion.

[todd71]

How's it going with the machine?