Messages

41

LazyTurn / Re: LazyTurn cuts where I don't want it to cut

« on: November 09, 2010, 10:29:23 AM »

Art:

I see that it is facing the bar, but I didn;t even have a line there(from outside to center at the "face" position. i think it would make more sense if lazyturn only did a machining operation on the profile that i have defined, no?

Andy

42

LazyTurn / LazyTurn cuts where I don't want it to cut

« on: November 08, 2010, 09:38:09 PM »

I am attempting to generate the code to modify a Collet chuck witha B&S #11 taper, to make it into a B&S #9 Taper. This is what the chuck looks like(in cyan) and the new profile I want to cut is shown in white:


When I clean up and import the dxf into LazyTurn, I get the correct profile:

Then I assign a roughing pass, and I get what I consider to be extraneouscuts in the X+, Y+ quadrant:


This will destroy the collet chuck, so it is obviously no good. I want to start each cut at a Z position greater tyhan zero, to take up the backlash in my lathe, and I then want it to follow the angle of the existing chuck body, to the proper depth, and then cut the taper.

43

SmoothStepper USB / Re: backlashcmpensat1on,and THC control

« on: September 20, 2010, 11:17:49 PM »

I'll have to look there again-I was just there this evening, and couldn;t find anything on backlash newer than Aug 2009.

44

SmoothStepper USB / backlashcmpensat1on,and THC control

« on: September 20, 2010, 09:05:03 PM »

Has there been any update on the status of backash compensation, or of THC control, in the SS?

45

SmoothStepper USB / Re: Smoothstepper PWM output has long ramp up

« on: July 27, 2010, 11:58:47 AM »

Jeff:

I had the noise problems before I installed teh VFD-and tehy don;t seem to have gotten worse with the VFD installed.

I am not using an isolated BOB-teh VFD control inputs are optoisolated though.

46

SmoothStepper USB / Re: Smoothstepper PWM output has long ramp up

« on: July 27, 2010, 09:49:48 AM »

Hii Jeff:

i think my wiring, grounding, and shielding is done correctly, though I know from past experience that it is sometimes closer to voodoo than science.

I am venturing into new territory with my VFD and 3-phase motor. Can I still install aline filter on teh spindle motor when driven by a VFED?

And I am very familiar with switching DC with relays; not so much with AC. Where do you get an arc snubber? is it something I can build?

Thanks,

Andy

47

SmoothStepper USB / Re: Smoothstepper PWM output has long ramp up

« on: July 26, 2010, 08:34:35 PM »

Well, that did the trick! Thanks again, Peter!

Now if I could just getthis SS to stop locking up on noise.......

48

SmoothStepper USB / Re: Smoothstepper PWM output has long ramp up

« on: July 26, 2010, 05:28:32 PM »

Thanks, Peter! I'll try that.

Andy

49

SmoothStepper USB / Smoothstepper PWM output has long ramp up

« on: July 26, 2010, 05:10:19 PM »

I am using a smoothstepper, with plugin version Beta2 0.015ogx, along with Mach3 R3.042.040.

I am controllingf my spindle via PWM, through a Homann Designs Digispeed which converts the PWM to 0-10VDC, then to my Moeller/Eaton VFD.

Everthing is working as it should, except that when I first press "Spindle FWD" or type "M3" in MDI, the PWM takes about 60 seconds to slowly ramp up to the proper duty cycle for teh commanded speed. It seems to take teh same amout of time whether I am commanding a speed of 25%, 50% or 100% of the pulley Maximum.

Once I have run teh motor at commanded speed. turning the spindle off and on does not change the duty cycle seen on teh PWM signal(I should mention I am looking at the PWM square wave on a scope.

I started out using 1000Hz as teh PWM base frequency, but I now have it set at 200Hz, as it seems to work much better with teh Digispeed at that frequency.

Has anyone seen anything like this before?

ANdy

50

SmoothStepper USB / Re: Updated SmoothStepper Installation and Upgrade Tips

« on: June 18, 2010, 10:03:12 PM »

Link doesn;t work for me...