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Messages - Davek0974

1651
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 25, 2016, 03:57:05 PM »
Thinking on it more - the hand wheels are on the screw ends so when using it manually, all the torque goes straight to moving the load - the belt only transmits position back to the encoder/motor.

I am confident it will work out fine, just over-analysing as usual :)

I've just about pulled everything off the mill now, DRO will be sold to raise funds ;)

1652
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 25, 2016, 10:21:37 AM »
Limitations of the system?

When i was building the large scale traction engines, everything was made with a tolerance of only 0.1mm or better - easily obtainable on a hand controlled Bridgeport with a three digit DRO. It really was not needed to go tighter on these engines and many say that if too tight they never worked properly due to expansion when running etc.

Anyway, the third digit on the DRO was pointless as you could never set that precision by hand and merely looking at the mill out of the corner of your eye made it wobble more than that!

So, now (when done) I will have ball-screws and servo's with Mach3 acting as my DRO display - this is all running on my bench very nicely now.

But - the encoder/motor is connected to the screw via a toothed belt - surely this must introduce an error possibility, especially with a 100kg sitting on the bed??

My main point here is - If i want to use the mill manually, say to drill some holes without cam-ing the job, I can put Mach into reset, this drops out the servo motors and i can spin the handles like before and Mach tracks the position on screen - I am hoping here that this is a workable situation with decent accuracy when positioned manually??

1653
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 25, 2016, 06:28:23 AM »
Also...

The cable from the drive to the CSMIO - probably about 2' long at most, shows twisted pair for the encoder lines - is shielded multi-core ok here?

I have a pile of Centronics printer leads in the box, these have nice moulded DB25 plugs on the end - saves soldering those horrible plugs up.

Fully wired so all 25 cores are connected, any good??

1654
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 25, 2016, 04:26:21 AM »
Wiring check...

Power supplies, one for the CSMIO and one for the inputs/outputs to maintain isolation?

The outputs on the drive are sink outputs so i would connect the +ve pin on the CSMIO input channel to 24v and the -ve to the drive?


1655
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 24, 2016, 01:55:51 PM »
Might not be too bad - it seems the motor side is set when you enter the motor code into the drive.

Will leave it there while testing at least, plenty more to sort out ;)

1656
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 24, 2016, 07:34:51 AM »
But....


there is no software i am aware of, certainly nothing comes with them and the site has no downloads menu??

1657
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 24, 2016, 07:14:40 AM »
Yes of course, it needs tuning in the final condition. Just waiting on a reply from supplier about tuning the motor/drive loop.

How solid should the "lock up" be on a servo shaft?

It can be wobbled about but always goes back where it started.

1658
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 24, 2016, 06:59:17 AM »
Ok, i did an auto-tune in CSMIO and we now have some sort of motion :)

It does state that the drive has to be tuned first but have no info at all on that yet.

Also what about steps per - i just followed the CS manual.

1659
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 24, 2016, 06:37:35 AM »
But can i tune without any motion ??

Do i need to get jogging before tuning??

I have no motion at all yet from the keyboard.

1660
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: May 24, 2016, 06:16:28 AM »
I think there are pn settings for output/input states but i have it on manual control for enable now and all others disconnected.

I need to get movement I think before going into controls.