Machsupport Forum
Third party software and hardware support forums. => LazyTurn => Topic started by: SimonC on October 07, 2011, 06:30:28 AM
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Hi all, The last few days i have been trying to learn Lazyturn. I read through the manual and all appendixes. Im up to the point were i have made a simple drawing in rhino CAD and inported it to lazyturn successfuly,created a tool and tried to create a rough tool path with it. The path it creates is a bit odd,im leaveing a 0.3mm clearance but the path cuts all the way up to the profile and even into the profile in some places,and on the fine finish pass it gos even deeper into the profile. on the finish path i was useing a clearance of 0. Im sure the problem is just something simple that i have overlooked but i cant figure out what.
any suggestions on what im doing wrong will be mutch appresiated
below is a pic of the tool path
regards
Simon
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Simonc,
Please post the dxf file.
RICH
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RICH, Heres the DXF im useing.
The DXF was saved as a "R12" DXF as mentioned in the manual but in rhino there are 2 choices for R12, one is "natural" and the other is "lines and arcs". I saved as R12 natural, could this be my problem?
regards
Simon
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Try attached dxf ( imperial units) and word file.
I had trouble with your drawing and no time to fool with it so i redrew.
I don't know what the difference is between the two dxf's from Rhino since i don't use it.
Maybe try lines and arcs.
RICH
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RICH, Thanx for takeing the time to redraw it for me.
I tried saveing as lines and arcs and also found a problem in my original dxf were the radius didnt join to the line representing the OD,but it still gives the same tool path result. Think il try one of the CAD programs sugessted in your manual instead of rhino.
thanx again.
regards
Simon
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I don't remember suggesting, nor would I suggest, a particular cad program to anyone.
This way if they don't like the program they won't be cursing me every time they draw a line...... ;)
RICH
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Here is another strange tool path from someone learning LazyTurn: the drawing is of a collet for a clock wheel saved as DXF V12. Tool is a 35 degree diamond. Just the rough path is shown but the fine path is similar. The billet is .5 brass rod with an OD on the right hand side of the collet of 5/32. Disregard the left hand side - that's to come later. I'm being very conservative using 4 passes of .042. Also disregard the very slow feed rate.
Why doesn't the pathing go all the way to the drawing and what are those paths on the right side?
The drawing of the collet is 1/2 inch but LazyTurn shows the shaded portion as larger. Is this some sort of compensation for the tool bit radius?
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The tif of the tool paths somehow got lost in translation.
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Post screen shots of :
-the tool input dialog screen for your 35 diamond
-roughing parameters dialog screen
- The top side ruler ( green / yellow pentagon) how much of an offset are you using?
Why are you doing that?
I have no problem with your drawing.
Have you had a look at the manual?
RICH
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Thanks for the reply. Attached are screen shots for the roughing parameters and the tool input dialog. I was experimenting with a 45 degree angle left tool to see if the pathing would improve. There are no changes with 0 degrees and center tool.
The yellow pentagon is .0413 and the green one is .0313. I had assumed that I needed an offset so the tool would not be butted against the billet but making the offset zero shows there’s still space between the two.
I have gone through the manual several times (as well as the Mach Turn manual) and have absorbed most of it, except of course the part that would make the correct pathing. Clearance and tolerance are still a bit hazy. I find, oddly enough, that getting through a 2 axis manual is more difficult than getting my Tail mill up and running with Mach 3 Mill. I’ve cut a number of clock wheels out and need to produce identical parts on a lathe. I just finished retrofitting a manual Sherline lathe to CNC and it appears to be working.
What did you do to produce the pathing shown in the hcir.jpg? It looks like you have a large number of passes, both for rough and finishing.
I need a sharp corner on the left side of the collet as that is where the clock wheel fits. In fact, the ½ in. part should be undercut slightly. How is this done with the typical diamond insert tools? A friend who runs a CNC machine shop suggested a parting tool from the rear toolpost would do the trick but that’s too advanced for me as yet.
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Interesting. I just upped the passes by changing the depth per pass from .043 to .022 and the pathing comes out more or less correctly.
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Clearance and tolerance are still a bit hazy
There are two clearances, one is how far you want the tool to retract from the stock ( pullout) and the other is how much you want to leave on the stock after the cutting ( stock clearance ). ( see page 23 of the manual).
You can think of tolerance as how closely the pathing will try to follow the profile.
Note that every button and it's associated inputs are defined in the manual.
What did you do to produce the pathing shown in the hcir.jpg? It looks like you have a large number of passes, both for rough and finishing
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It is so easy to delete and then do another rough and finish pass that i would recomend that a new user use a rougher /
more cutting depth so they can get a feel for the passes provided and get a feel for the pathing.
So instead of .005" depth of cut use say .050" and you will see what is provided and what is left until you get the hang of it.
I need a sharp corner on the left side of the collet
You will need to use a sharp tool ( parting tool will work ....create the tool and try it) or use a left cutting tool. You can't select a place on the part to start the pathing but you can always use the same dxf with modifications.
As the profiles become more compplex you need to use a number of different tools just as if you were doing it manualy
on the lathe.
RICH