1 Week Ago #81
Jazz, system jogs great, homes correctly on all three axises. I tried MDI commands and get the message "Move off Limit before MDI command". Whats puzzling to me is that Mach says this even with all limits turned off.
thanks for the quick replies
1 Week Ago #82
Actually thinking about it I've had this before but can't remember what caused it.! . . . Got feeling it's something silly and obvious like a setting but can't for the life of me remember what.? . . . . . Nearly bed time so I''l sleep on it and get back to you.
1 Week Ago #83
1 Week Ago #84
Edit: Actually I see you only have set to 2 which isn't so bad thought you'd set it to 8 which would have been 32ms.
Last edited by JAZZCNC; 1 Week Ago at 02:03 AM.
1 Week Ago #85
1 Week Ago #86
1 Week Ago #87
I learned some hard lessons last night while continuing to tune the servos.
1st, make 400% sure that the ballscrew mid-supports can not get hung up on a sudden change of direction.
This bent back pretty easily but I will need to make some modifications to make sure it cant happen again. Basically the machine stopped before the support flipped and on change of direction it caught on the ballnut mount. No other damage observed which is good.
2nd, and this is the big one, when butting linear rail together remove the lead in on each rail. I had known this was the case but being that I got the rails for cheap and not having a way to accurately grind the rails I chose to try it.... bad choice.
What the pictures show (or what I assume happened), as the block went past the joint a ball dropped into the joint, caused alot of extra force and blew the end of the block off. At lower speeds it seems to be fine, but I was running past it at ~1000 ipm. I think the block counldnt handle it I was able to stop it before the other 2 blocks hit the joint. I have 4 extra blocks that came with the used rails so I can put it back together for now but I need to make a plan for future.
I think my options are
1 - remove rails and have them ground and put back together - this is a no go as the cost would be more than just buying Hiwin rails
2 - buy Hiwin rails and blocks - definitely the best option but costly
3 - try to fill the groove/lead in
- Im thinking of trying this method, couple options, epoxy, babbitt, other options?
- I think I just need to keep the balls from dropping in there, I think there shouldnt be too much stress on the fill otherwise.
4 - just use the 8ft of full length rail for now???
Any thoughts are appreciated...
1 Week Ago #88
Ouch.!! . . . Bad luck. That's difference between Servo and steppers. They take no prisoners! . . . Stepper would have stalled before bending that bracket or possibly ripping the bearing end cap apart.!
1st Choice is no brainer new Hi-win rails.
2nd Choice new Hi-win Rails
3nd Short term Choice fill with Metal Epoxy. Think it's called JB Weld in states.
No other choices IMO.!
Last edited by JAZZCNC; 1 Week Ago at 06:46 PM.
1 Week Ago #89
6 Days Ago #90
While still waiting on the fan adapter so I can cut with the machine, I decided to draw up a dust collection adapter mold to lay up fiberglass in. Video shows the machine running this code.
I put the X and Y to 1000ipm as 2000ipm scared me and while I am learning about this machine I wanted to be a little safer.
I also have a question about what a ballscrew/ballnut should sound like. I have never been up close to a ballscrew before so I wonder if these sounds are normal. The sound I am referring to sound like bearings circulating through the ballnut but just doesnt sound real smooth... Sorry pretty hard to tell on the video I guess but if anyone has insight please let me know.
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