The Mrs aint gonna be happy about this little project!

[Ricardoco]

Even before welding, it's questionable whether steel box section is accurate enough to mount round rails on opposite faces, so no matter how good the welding is it's not a good plan. It certainly wouldn't work for profile rails without further machining or shimming.



How do you know?

Because ive measured it.

[Jonathan]

Because ive measured it.

What did you measure from and to and using what instrument?

[Ricardoco]

What did you measure from and to?

Do you want to know how i measured it or where i measured it?

[r0bsk1]

Well it's been a while since i last update due to other commitments but i've finally mounted Jonathan rotating ball nuts (oooooeerrrrr missus!), built the 70v PSU with 24v safety system and got it moving with 860 drivers and 4Nm steppers. Not moved it using Mach3 yet but only used the pendent that came with the BOB.
Just working out the idea of a pneumaticaly controled table height if/when the pneumatics arrive. That's what my recent wanted post is for

[r0bsk1]

Ok this is a bit of a strange one.....
I have 2 screws for an axis. They move independently using the pendant in both directions but when using Mach3 to jog the axis using the keyboard something odd happens!
At this point i haven't slaved the 2 sides together. A side of the axis moves up and down fine. B side moves up only. When i try to jog side B down it seems to release the holding voltage and spins free.
I have to tap the key to jog side A down slightly and then side B will jog down.
Side B then moves in both directions but side A will only move the 1 way.
Has anyone else had experience on this?

[JAZZCNC]

Ok am I getting this correct your trying to jog 2 motors on same axis at same time independently and keep them in sync.? . . . To be honest If connected to gantry your just asking for trouble and bent ballscrews.!!!. . . . Anyway are you sure your not just stalling the B motor by racking the gantry or axis.?

If the B axis just moves in one direction intermittently then I'd check you Dir connection at the drive it could be loose.!!

You could have dodgy keyboard. To test if things are ok try using MDI commands for each axis if they move ok with G-code commands and they move with pendent then chances are key board is playing up.? The pendent will use the same Axis commands the keyboard does so to mach it's no different, they are just key press's.

Have you tried removing pendant and see what happens.? They could be clashing.??

[r0bsk1]

I've not slaved the 2 side together yet just so i can confirm each side is working correctly. I've no tightened things up yet so there's enough slack in the gantry to allow independant movement of each side.

The pendant plugs directly in to the BOB, not the PC so commands as different and with this working i though jogging via Mach would be fine.

Well it turns out that the pendant does conflict with keyboard jogging commands. If i unplug the pendant it it's fine and both side jog via the keyboard. They're now slaved together and all is good in the world for now and i can tighten things up.