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Messages - RICH

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6921
LazyTurn / Re: LazyTurn
« on: November 10, 2008, 06:37:42 PM »
Hey Dave,
What CAD software are you using? Just draw something and dxf it out.  .....or......
Attached is  a file that works.
Import it and save it in your native CAD program  then just export it back out. This will give another version of software dxf output to test. I am limited to Autocad and Microstation.
RICH
 

6922
LazyTurn / Re: LazyTurn
« on: November 09, 2008, 10:38:21 PM »
Thanks Art,
Now that's the way I like it. Quickly opened up bunch of  those files that didn't work before.  :)
Now i quess it's time to play "stump the importer"! ;)
RICH


6923
Tangent Corner / Re: Serious Puzzler
« on: November 09, 2008, 09:59:08 PM »
RC,
The ring is 1.875"OD + - .OOO5  and  1.3338 ID+ - .0002    so a little thick.
I compressed it 0.006" about 90-270 deg , so 0-180 deg on ring is parrell with vise jaws.
With one of the mikes prongs at 90 deg ID= 1.3330
    "      the same          "          180   "  ID= 1.3368

I think they are nuts also for taking an average. In fact shouldn't they be summing the squares and taking the square root?
I can do a ring with a smaller wall around 2.5"od x .050 wall if you wish tomorrow.
MODIFIIED:
OOPS: only go to 2" with the mikes so it would have to be samller but what your quessing would be the same.
RICH

6924
Tangent Corner / Re: Serious Puzzler
« on: November 09, 2008, 09:05:45 PM »
RC,
Let me try it out. and will get back shortly.
RICH

6925
LazyTurn / Re: LazyTurn
« on: November 09, 2008, 08:59:06 PM »
Thanks Chip,
A fast computer really comes in handy when going back and forth on the path generation.
I always start out with something  like a .1 depth just see if it works.    BTW 0..1 doesn't work to well. ;D

Will shrink the file down and see if there are any effects. Also curious on what the dxf exchange will be like.

I'll need to check out some of the other files that were failing. It's cutting them off right at a joint, and think that
how the lines were joined / trimmed reverses the direction  and the importer thinks there is no more profile.
How is that for a wild ask guess! Drawing sequence of the path cannot be allowed to influence the import.
Can you image the problems users would have!
 
You must admit though, that if this comes to pass, this will be one neat program.
RICH

6926
Tangent Corner / Re: Serious Puzzler
« on: November 09, 2008, 07:14:57 PM »
RC
A couple of things first for what it's worth.
The problem with doing rings are that the material, in your case, is solid and even if say it was cored, there are internal stresses in the material. Now as you machine .... turn outside then some inside boring check ...... over and over ...
then on the last finish passes  all is in to spec. Then you part off and it eggs because of some residual stress still exits
but is held back because it's still attached to the bar. If the bar or cored bar were normalized you " may " not get as much springing after cutting off. Normalizing the part is nothing more than heating and cooling the material in a controlled manner and it does cost money.  I know this is different but i had 3" round s/s x 6 foot lengths machined down to 2.750 +- .001 and gun drilled for a 1.0000+-.001 +- .003 concentric over any 3' length at $1000 / ft cost. I had go / no go  3' foot long gages made  hardened and ground for checking by the inspector.
------------------------------------------------------------------------------------------------------------------
I use and have a set of B&S Intramikes,  they will show out of round easily but about one circumferential location only and you would measure in four quadrants or more. But frankly speaking, a go no go gage would be better, as i actually like to use pin gages.  You can't relate the mike measurement to eccentricity along the bore and certainly not if it's egged. The pin gage can do this for you and mounted between test centers you can relate the outside along it's length. When using these mikes they click when enough turning force has been to seat the three faces. The force is quite small (10  in oz? ) and if it's egg shaped, and unless it's a really a thin wall, i don't think you would duplicate the go no go test as it is not
forcing the ring wall out.

The easiest way i could think of, based on measurements, would be to draw the piece in cad and then you can scale / stretch that piece to a around, to prove that even though measured wrong, it is round. Don't know how this would come out in reality or how convincing it would be.
But then that's what a go no go gage can do except that your adding some force to get it to shape. Certainly would be easier than trying to prove it mathematically. 

What is important is the end use of the piece and how it was specified.  So if the guy wants a piece that's a true cylinder / ring with no outside
force required to have it in that shape and to dimension that's one thing. Not having any understanding of end use or concerns is hopless if you
look come at it from a practical point of view.

RC, post your thoughts and I'll think more about it if you wish,
RICH

6927
General Mach Discussion / Re: Mach 3 hardware drivers
« on: November 09, 2008, 06:13:04 PM »
Andy,
I run Mach on a old 400mhz / 512 k NEC Versa laptop with PP and works fine ( slow PC but it works).
The Dell Optiplex GX520 tower with oboard graphics will not work unless the SS ( Smooth Stepper ) is used.
The Dell Latitude with all the "junk" ie anitvirus etc will run using the SS ( just tested it for kicks / highly recommend a dedicated PC).
Like Hood said, never know until you try it! LOL
RICH

6928
LazyTurn / Re: LazyTurn
« on: November 09, 2008, 05:56:51 PM »
Willem,
The three balls file is complete but for whatever reason LazyTurn will not   fully   load it for me either and that's why i posted it.
I have found a number of DXF's where that is the case. Provided it as a clue, Art may be able to see if it's the importer or is it a CAD issue. 
Take note of my last post. I create DXF's out of two versions of Autocad and three versions of Microstation for a total of 9-12 dXF's of the same profile drawing sometimes. Trust me that they are they do not necessarily export the same sometimes. But for now strictly trying to DXf  out to a ver 12 as that worked in LazyCam.   Your not alone on the TODO but don't even remember what i did. You may try rebooting the PC.
BTW only use the "button tool" for now, i think Art said that back a few posts.

Will post a version of Chips file, which i shrunk and rotated which worked fine, thus you can play with it or try his other files.
RICH

6929
Question on switches. Does the dro indicate the small movement created when the stepper is powered after being shutoff?
Maybe a dumb question, and no quick answer needed, as i don't use switches yet. But curious.
RICH

6930
LazyTurn / Re: LazyTurn
« on: November 09, 2008, 11:36:48 AM »
Art,
Some more tests relative to Lazyturn not showing complete profile on import.
I am attaching files 1B, 2, 3. I figured it may be a drawing problem but shouldn't be.

A few comments about what is shown in the creen captures from lazyturn:

A drawing was created in Autocad and 1 was rejected because of the dot in the drawing
as shown in DOT IN 2. With the dot removed only got a partial import as shown in 1B.
Modifying the drawing by adding another taper as shown in 2 worked and then removing
removing the taper and going back to a face as in 3 it also worked.

Note that in 1C & 1D i changed the direction of how the line was drawn but still was a no go but did seem to
add to the import.

RICH   
 

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