Hello Guest it is October 14, 2019, 12:42:11 PM

Author Topic: Problems threading on the lathe  (Read 331221 times)

0 Members and 1 Guest are viewing this topic.

Re: Problems threading on the lathe
« Reply #390 on: May 27, 2009, 02:10:36 AM »
One thing to be aware of is that the VFD creates noise in the supply line also. This noise travels back the supply line and can enter the SS through it's power supply. How is the SS powered? Does it have it's own 5V transformer? Does the supply line for the VFD run near other lines which maybe enter the control cabinet? Which make VFD is it?
« Last Edit: May 27, 2009, 02:12:29 AM by SteinarN »
Re: Problems threading on the lathe
« Reply #391 on: May 27, 2009, 09:07:29 AM »
its a 30 hp VFD from automation direct. I have a 40 hp rotary phase converter on the wall aprox 5 feet behind the lathe . The power from the phase conv runs into a circuit panel where its distributed , one leg to the vfd on the wall right beside it. The rest of the machine receives its power thru a delta to wye transformer. Off to search for the vfd noise related thread so I can stop cluttering this threading thread up with unrelated post

Offline ART

*
  • *
  •  1,698 1,698
  • Tough as soggy paper.
    • View Profile
Re: Problems threading on the lathe
« Reply #392 on: May 27, 2009, 11:06:27 AM »
Hi Guys:

  New version. Liek to know if you can thread now with more slots Chip..Your latest photos looked great other than
that. This version shoudl also slow the Z if the spindle slows in a thread run.

Art

Offline RICH

*
  • *
  •  7,367 7,367
    • View Profile
Re: Problems threading on the lathe
« Reply #393 on: May 27, 2009, 10:16:23 PM »
Art or Chip,
Is this version for real threading or just simulation?
RICH

Offline ART

*
  • *
  •  1,698 1,698
  • Tough as soggy paper.
    • View Profile
Re: Problems threading on the lathe
« Reply #394 on: May 27, 2009, 10:30:45 PM »
Rich:

 Should work for real in theory.

Art

Offline Chip

*
  • *
  •  2,056 2,056
  • Gainesville Florida USA
    • View Profile
Re: Problems threading on the lathe
« Reply #395 on: May 28, 2009, 02:10:33 PM »
Hi, Art

In simulation it appears that you need both Index and Timing pulses to get threading to start, Slowing Index during pass doesn't seem to take affect till next pass

Number of Slot's work above 80 on both computers now, Scope on top still doesn't work.

Thanks, Chip 

Offline ART

*
  • *
  •  1,698 1,698
  • Tough as soggy paper.
    • View Profile
Re: Problems threading on the lathe
« Reply #396 on: May 28, 2009, 02:47:18 PM »
Chip:

 You need Either INDEX and TIMING inputs, or INDEX and Encoder#3 inputs to start threading..

The slowdown is caused when it see's the slot times change or the encoder timing change.

Art

Offline Chip

*
  • *
  •  2,056 2,056
  • Gainesville Florida USA
    • View Profile
Re: Problems threading on the lathe
« Reply #397 on: May 28, 2009, 03:46:30 PM »
Hi, Art

Thanks for the clarification, Yes in fact it dose work, Down and back UP to pass feed rate as Timing changes.

I wasn't changing the timing enough to see it working.

Back to getting both OPTO's working on my Compact 5 for some actual cutting.

Thanks, Chip
Re: Problems threading on the lathe
« Reply #398 on: May 28, 2009, 10:29:58 PM »
Got my issue all ironed out , simply put the SS board inside the computer cabinet at the front of the lathe , wired it to an internal USB on the motherboard , mounted the two DB25 connectors and ran 2qty 12' printer cables back to my BOB at the back of the lathe and it seems to be running like a top.   Dont know why I didnt think to just move the SS into the computer case 4-5 days ago , would have been much easier since i already had the printer cables routed anyway

Offline RICH

*
  • *
  •  7,367 7,367
    • View Profile
Re: Problems threading on the lathe
« Reply #399 on: May 29, 2009, 07:13:10 AM »
pan...m,
 :) Good for you. My SS is also mounted inside the pc case.  Common grounding, case shields the SS, the cable from USB to SS
is short and also has a choke on it. Taking a moment to think now about what you eliminated to get results would be benificial. It could have been a one or combination of things.
RICH