Machsupport Forum
Third party software and hardware support forums. => LazyTurn => Topic started by: awander on November 08, 2010, 09:38:09 PM
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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:
(http://Collet Chuck.JPG)
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:
(http://Lazyturn Collet Chuck.JPG)
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.
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Try grabbing the yellow arrow and draggin it to the left to indicate a different start location..
Art
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>>and I get what I consider to be extraneouscuts in the X+, Y+ quadrant
Just a note, those motions arent reallt extraneous, just what it woudl do if the bar was free hanging, as its as close to facing as it can get with that tool.
Art
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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
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Try grabbing the yellow arrow and draggin it to the left to indicate a different start location..
Art
Trouble is, i want it to start further to teh right, so that in going way over there, and moving some distance back to the left befoore machining starts, it will take up the axis backlash.
Andy
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Andy:
Lazyturn requires all profiles to be closed, so if you didnt draw to zero, it did. I dont think it will do what your attempting.. there is no built in blocking zone or anything, the best you can do is draw the chuck and tell it to start at a safe point. I didnt allow any provision for backlash takup when an obstruction exists..
Art
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OK, Art, i will play with it some more.
Thanks,
Andy
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You may want to read Appendix "F" of the manual. You can start anywhere you want.
BTW, i would have set it up differently. Ground rod mounted in the collet and indicated in chuck, the tail held by a live center and also indicated in. After your done machining, check taper using light coating of die ( better than chalk) and see where there are high spots.
Frankly the shank should be ground to run really true.
RICH
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Hi Rich:
I thought about setting it up the way you suggest, but that means that I would be advancing (negative) in X, then retracting as the cut progresses toward the chuck. I thought that wouold be a bad idea with the amount of backlash on my X axis.
The way I have it set up, I will be advancing(going negative) in X for the entire pass.
I just printed out the manual and will read it more thoroughly tonight-thanks for teh pointers!
Andy
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I may just be thick, but I don't see anything in Appendix F that lets me change where the cut starts on the profile. All I see is a long explanation of coordinate ssytems and tool table.
Andy
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My bad, I was thinking about taking the backlash out on the initial move before cutting from a homed position.
Maybe thie will help....
Turn a diameter down using backlash compensation such that you use the equivalent number of moves and see how
all turns out relative to desired finished diameter. That will give you idea of how much you should leave so you could
manualy add a few lines of code for tweaking the profile down to size.
BTW, it doesn't take much on a taper to end up having the tapered end go deeper or extend out when put into
into the recieving piece.
RICH
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Hi Rich:
Unfortunately, i am using SmoothStepper, and waiting with bated breath for teh plugin with backlash comp enabled-due any day now!
Thanks again,
Andy
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Hmm......no comment on the SS backlash
I will say this, your machining will only be as good as your lathe system.
RICH
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Yup, I do have confirmation of backlash working in the SS, I too suspect it wont be long before thats relased, I know for a fact it is written and seems to work OK..
Art
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Geepers, only one thing to transparently bitch about and you guys go and take it away. ;D
Back to the side I go..... :D
RICH
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lol...
Just shows to go ya..
Art
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???
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I made the draing a little large in both X and Z extents, so that the tool will move farther positive in both axes, thereby taking up the axis backlash when it moves "back" to the spot where it actually will cut.
The roughing toolpath looks good, but when I set up a Fine path with the following parameters, it again tries to take a chunk out of the piece:
Clearance: 0
Final Pass: 0.001
PerPass: 0.005
Tolerance: 0.01
It also looks like the fine path does not cut all the way to teh profile.
What am I doing wrong?
Andy
PS I see thatthe Zoom Out and Zoom IN in the menu pulldown are backwards
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...and even stranger, when I post and open the tAP file in Mach3Turn, it appears as if the Roughing path is in Diameter mode, while the Fine Path is in radius Mode!
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Try grabbing the yellow arrow and draggin it to the left to indicate a different start location..
Art
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awander,
1-Save your Gcodes and Mcodes and load the codes in Mach3Turn.
2-In the cycle menu, move down the codes lines and you will see the toolpath.
3- When you reach the part of the codes you do not want take the line numbers (exemple between 300 and 3000).
4- Edit your codes and delete the lines, resave the Gcodes.
5- Retry it in Mach3Turn simulation to see if you remove the lines you do not need
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Hi everyone,
I'm retrofitting a lathe with a licensed Mach 3 + Lazyturn. I'm not able to work with 2 tools, the first in front side and the second in the rear side:
- Lazyturn can not generate the negatives X-coordinates (I think)
- Defining the second tool as "rear" in Machturn, the tool work as frontal
How can I do? Please, somebody help me.
(Sorry for my language, I'm from Italy)
Thanks
Ugo
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Ugo,
How can I do?
All the LT testing done was with a front mounted tool. Rear mounted is not addressed in defining the tool so it is the way it is.
I would need to see the affect if the Lathe was configured as a slant bed / rear mounted tool.
I am going to guess that the code will not work and would need to be manually altered. You should not mix front and rear.
Hood may chime in on using front and rear tool posts.
RICH
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Hi Rich,
I try to explain it better.
I test the machine with only one tool defined and used in the part program. The number tool is 1. All the tool offset are 0. All the work offset are 0.
The distance between the front and the rear tool is 0.
- If I define the tool as front the toolpath is right.
- If I define the tool as rear the toolpath is the same as when defined front. Only the buttons for manual X are inverted.
Ugo
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I forgot!
I think that an easy way could be to develop Laziturn (very simple&good CAM) allowing to define the tool as rear. It need only to update the X quotes as X=X*(-1).
What do you think about?
Ugo
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to develop Laziturn
Lazyturn is no longer being developed...it is the way it is unless Art decides to modify or change it.
RICH
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Hi:
>>Lazyturn is no longer being developed...it is the way it is unless Art decides to modify or change it.
:), very true. I may add to it some day, but it was meant only to be a simple code generator done in a unique way. I have so many projects going on that
I may never revisit it, or I may decide to commercialise it someday so it can grow. But at the moment, even with its limitations, its a handy free utility, and its nice to see its
being used.
I learn more about toolpathing and 3d every day, so perhaps someday it will all come together in a new project..
Art
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I learn more about toolpathing and 3d every day, so perhaps someday it will all come together in a new project..
Perhaps even containing a wizard for bevel gear blanks ? ;D ;D
Tweakie.
Keep up the good work Art - you are the man.
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Hi friends,
I'm trying to work with rear tools. I invert the X-quotes (from positive to negative) using the function "formula" X*-1.
All run well, except the first X-positioning G0 or G1: before going to the right quote (becomed negative by formula), the axis go quickly to a positive (undefined) quote, then follow rightly.
I don't know how can I do.
Thanks
Ugo
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Radius,
I'm trying to work with rear tools.
Please read my reply #22.
Suggest a look at the manual to understand how the generated code is compensated. Then consider using a G52 maybe ( see section 6.2 to 6.5 in Appendix F).
RICH