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Messages - RICH

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6331
General Mach Discussion / Re: Problems threading on the lathe
« on: April 10, 2009, 04:18:41 PM »
Hi All,
Was off on a trip and just got back.

The "Use  Spindle Feedback In Sync Mode and also Spindle Speed Averaging is checked.

The RPM displayed in the DRO will only flicker once in a while and then only within 1 rpm and
I check the actual RPM with a good speed indicator and it says 300 RPM.
The cuts were 25 passes, but total depth was only .005" to eliminate any rpm influence and never once did I notice the rpm change.

I didn't use diagnostics to see what was happening in it's RPM reading ,and unfortunately, when using the SS you don't have a take on the rpm as when using the PP and can monitor with the Turn Diagnostics.

In the latest version of threading you can no longer put a dwell before or after the pass as you were able to do in prior versions. That allowed me to take actual indicated readings on each beginning and end of the Z moves for comparison.

Just for info, no need for comment,  I got a buddy who just CNC'd a lathe, has a two horse motor and when geared for like 600rpm it's probably like 5 or 6  hp,  for a screw he used a 1-8 tpi of threaded rod and has 0.046" of backlash ( hardware store threaded rod and nut ) . He uses backlash compensation and does small and large threads that look like they came off a high end machine. No i haven't checked the lead on his threads , but the point is, here is a machine that should turn out crap for threads and it dosen't! Mind boggling!

Have a few thinsg to do and then will fool around some more. Want to try ART's rpm test on a few different PC's.
RICH


6332
General Mach Discussion / Re: Problems threading on the lathe
« on: April 10, 2009, 08:23:40 AM »
John S,
I used the SmoothStepper and also just one index pulse from a slotted disc.

I also thought all was fine using the SS, but the largest threading i have done was 1/2"  
and 1" or so in length. I also demenstrated how to pick up a CNC'd thread using the slotted disc.
I deliberately did the threading this way because never had any problem. Also believe it is not a
mechanical or a diameter of stock issue.

A lot of settings / inputs even mechanical as they relate to threading can have an effect on the thread outcome, but each of those should not create a constant increase of the lead. I could probably
write a few pages on each of that thought. It's basicaly a Z distance related problem and only ART can find what it is.
 
The data given from my test says there is a 4 to 5x error in lead ( .028"/.006" ) over 2 inches. The scribed lines on the diameter just magnifies it.  Lets see what ART has to say.

Please question as ya all wish, as i have been wrong before!
RICH


6333
General Mach Discussion / Re: Driver Test Assumptions
« on: April 09, 2009, 09:48:07 PM »
Russ & Fernando,
You are not alone on the driver test understanding. I realy don't think you can relate what that graph looks  like and expected preformance to the driver. My Dell graph is quite clean yet it absolutely suck's when it comes to the signal pulse given to the stepper driver! Just a comment for it's worth.

Hey Russ, what does the graph look like when your not capturing a screen during the driver test?
RICH

6334
General Mach Discussion / Re: Driver Test Assumptions
« on: April 09, 2009, 09:32:49 PM »
Hi All,
Here's one way to put those spikes on the screen into perspective.
While the driver test is running, just start moving your mouse around and see what happens.
 
Then when your running a program in MACH3, start moving your mouse around and see what happens.
On a slow PC  the cutting actualy will slow down due to all the interupts.
Now you know why I sometimes say " don't play with your mouse".  ;)
RICH

6335
Happy things are working for you. I know that the SS was another expense but compared
to the agrivation of that computer the SS cost is only a memory now.  ;)
RICH

6336
General Mach Discussion / Re: Problems threading on the lathe
« on: April 09, 2009, 08:40:52 PM »
John,
Fruitless trying to come out with a good thread when the threading is in error.
If the scratch lines won't track you will never get a good thread.
Happy I tried something bigger and longer since you had me stumped.

I didn't try Art's recent file. Looks like not much of an improvement.

Don't you feel good knowing that it's not only you!  ;D
RICH

6337
General Mach Discussion / Re: Problems threading on the lathe
« on: April 09, 2009, 08:23:57 PM »
ART & JOHN S,
Yep, the threading is progressively changing on each cut and it's not in the
code generated by the wizard and not apparent until you do a larger diameter and longer
length threading as John mentioned.
I am using MACH3 ver 3.042.024 and a SmoothStepper and wanted to what would happen.

This thread was done with the Smoothstepper using G32 code generated by the wizard.
Stock is S.S.,  0.735" (18.65MM ) OD x 2.6" ( 66 MM) long thread x 0.0788" ( 2MM )
pitch at 300 rpm, 29 deg lead in, 25 passes @  0.0002" deep. Z clear was set at 3"
( approx 4 times the pitch ). Although not using metric this kind of mimic's a 2mm thread.

Looking at the Gcode the incremental change in the Z is 0.0001" for each pass for a
total of .0024". So if the lines were individualy scribed onto the stock, and you could see
them, then you should have 25 lines at the start of the piece and 25 lines at the end of
thread contained in a width of 0.0024" wide.

This is not what is happening with my single test. I have tried to provide meaningfull data.

Now  the first scribed line has 25 "scribe lines in it and contained in a width of 0.006".
which is located from Z=0 at approx -0.3". Now as the thread progresses and the pitch
is increasing ( it shouldn't ) and now  have 25 lines contained in a space of .028" at Z=-2.3".

I have attached some pictures:
THRD_JOHNS_HCIR123- composite picture of the next three.
THRD_JOHNS_HCIR1 - shows the thread progressing on the piece
SCALE_THRD_JOHNS_HCIR2 - shows the pass at Z=-2.3" at approx 30X.
60X_WIDTH_HCIR - this picture at 60X shows only  the 25 cuts at Z=-2.3.
                             The small black tick marks represent an even progression of 0.00113".

Hope all the info provides some measurable basis to refine threading.  ???

RICH

6338
General Mach Discussion / Re: Problems threading on the lathe
« on: April 08, 2009, 01:52:48 AM »
JOHN S,
Will try a some longer threading 3 to 4 inches and see what happens here. 
Nice lathe and trust me when i say i undestand your frustration.
RICH

6339
LazyTurn / Re: LazyTurn
« on: April 06, 2009, 10:45:03 AM »
Art,
In reply #1001 i drew an insert. Note the Inscribed Circle and attached is what i put in the manual shown
in attached pic.

Is the info correct?

Rich

6340
LazyTurn / Re: LazyTurn
« on: April 06, 2009, 12:53:40 AM »
Gee's Chip,
You didn't read the fine print on the small tool.
"Postage is not provided and the tools are meant to be ground by you and per the drawing. Also, "No warranties are expressed or implied" by this thread.

Once again congradulations #1000.
 ???


 

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