Second CNC table build, here we go again....

[D.C.]

Made the replacement wall panel today, fitted the extract fan to it...
This should replace one of the slabs in the garage wall directly,

Is the fan for dust removal or heat removal?
If you try venting electronics outside you will end up killing your electronics with condensation, which would be bad. :(
You can mount a closed loop radiator externally for heat removal, but air is a no-no.

[Davek0974]

Nah that fan is the table bed downdraught fan - needs to vent outside, intake air will be through the open door. Will be cold in winter but no other way to vent that much air.

[Davek0974]

Back from a way too short holiday Stripped the workshop out and moved the new table into final position...







The extract fan panel fitted perfectly, but shifting that volume of air turns out to be damn noisy, i can probably expect trouble from the neighbours i think, will have to be careful when i choose to do my cutting

Finishing off the panel now, fitting the BOB boards and wiring them in, then i need to build something to hold the monitor and keyboard etc, some sort of workstation.

Then i have to puttee workshop back together again

[Davek0974]

Panel finished...



Mesh below the slats...



Bit busy up that end of the shop



Stuck the monitor on the wall, seemed a good place, still working on the keyboard and mouse/trackball, might be a slide-out under the front of the table. I couldn't fit the PC into the main cabinet - not enough space



One odd thing I noticed when motion testing with the proper PC, the X & Z axis worked perfectly but the Y & A needed the "step active low" setting reversing in ports & pins? They sounded very rough and notchy when set the same as the other axes.

This seemed odd as all drives are the same, wired the same and connected to the same BOB????

Any ideas why I need to run two axes reversed signal level???

[JAZZCNC]

Any ideas why I need to run two axes reversed signal level???

If all wired same and the drive doesn't have an active edge Dip switch then probably because setup different in the drive software. Some drives will provide a Dip and most Digital drives you can access thru software.

If none of the above then could just have been set different at the factory,?

[Dragonfly]

"Active Low" means the drivers are wired with common +5V and step pulse inputs wired to the minus terminals, right?

[Davek0974]

"Active Low" means the drivers are wired with common +5V and step pulse inputs wired to the minus terminals, right?

Yes, all wired common +ve

[Davek0974]

If all wired same and the drive doesn't have an active edge Dip switch then probably because setup different in the drive software. Some drives will provide a Dip and most Digital drives you can access thru software.

If none of the above then could just have been set different at the factory,?

But these were tested with a different BOB when i was building the table and all settings were the same????

One difference is that the test PC was underpowered and only ran at 25khz, the work PC runs at 45khz, step and dir pulse length is 2us on both PC's

[JAZZCNC]

But these were tested with a different BOB when i was building the table and all settings were the same????

One difference is that the test PC was underpowered and only ran at 25khz, the work PC runs at 45khz, step and dir pulse length is 2us on both PC's

Don't know then. Maybe the new BOB does some filtering and signal boosting depending on the PP voltage.? If your on the edge with say 3V PP then the BOB could be boosting and inverting the signal just on that line.??? . . . .Strange beasts these CNC machines.!!!!