Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: mpix00 on January 26, 2016, 04:06:37 PM
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I just got my cnc lathe kit on and wanted to try a OD SPHERE wizard. I am having a hard time trying to figure out how to set the PROGRAM/MACHINE/PART X&Z SET ZERO. FOr the PART, I am toughing my TRIANGLE TIP to the very end of the rod and that is where I set my Z-zero. Then I find the very front corner of my rod where it meets the end and set that as my X-zero.. So X&Z are set at the exact same place.. Is this correct? For the Machine set zero/home, I find the exact middle of the rod on the end face for X&Z and then I go +Z 1" and +X 1" and set that as my machine zero set. For the PROGRAM Zero set, I have no idea how to set that? Can any one please clarify? I have been trying to do this for hour and trying to run a WIZARD for OD SPhere and am not gaining any ground?
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:) Greetings.
Firstly, you should look through the TURN manual to get a general idea of how the coordinate systems relate to the machine and the part.
It is a very informative first step that will answer many of your initial questions.
Chapter 7
Cheers,
Russ
:)
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I did read and go through it, but I seem to be missing something, as I am trying to run the OD sphere Wizard. When I start the cycle, the tool moves out about 1/4" outside the 5/8" stock towards the + X /// I am not sure what I am doing wrong? I place the 5/8" stock in. I place my tool holder and crossslide about +z1" & +1"x and set that as my MACHINE COORDINATE Zero. Then I place the tip of the tool at the very end of the 5/8" stock and set the Z PArt to zero. I then set the tip of the tool to the front of the stock and set that as X part to zero. I am not sure what to do with the PROGRAM set as it seems to always have the PART zero values.. Does this seem correct? The I go into AUTO and try to run the WIZARD... my tool holder is on the front quick change tool post facing left towards the stock..
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I then set the tip of the tool to the front of the stock and set that as X part to zero.
You would set this at .625 in PART coords.
Re-read the part about setting up the tool ... touch off, or skim cut method.
It' all right there.
Russ
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Ahh o.k. I did not understand that part about entering in the OD of .625. For the PROGRAM SET ZERO, Do I even enter anything for that or is it the exact same as the PART Set Zero values?
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mpix00,
I have attached a some info from a rough write up for my lathe screen set. I think it will give you some basics you need to
understand, BEFORE, you start trying use your lathe.
I think that most new lathe users get confused as they quest to start trying out their new lathe.
Here is some simple thinking that can become repeatable / habit forming such that things turn out correctly.
1. Define Machine Coordinate (MC) Zero - the controller now knows where YOUR machine zero is.
2. Now define where the stock / part is to the controller. The part is usually some distance away from MC=0 but it is always
on lathe center. That is what Part Coordinates (PC) are. Now most simplistically, you can make MC=PC=0.
There will be no work offsets and the MC & PC coordinates will be the same.
3. Generate the gcode to cut the part such that the code is based on the center and face of the part.
Make sure when you use the wizards that inputs are correct for the lathe mode you have defined. ie; Dia or Radius mode.
And lastly, hate to say this, STUDY the manual.
Have Fun,
RICH
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Yes I have been reading that Manual studying it.. My Wife is 13 weeks pregnant and we have a 1 year old son, so getting time to work, study the Manual like I need and get out there to try and test out my new findings are very minimal at this point as I am helping out my Wife with pretty much everything. She is very sick so far during this pregnancy, so I am trying to get as much information as possible.
Thank you so much for this clarification! It sums up pretty much everything I was confused about. Between your information and the information of entering the Diameter in X on Parts Zero is what I was not understanding. I am in Diameter Mode.
So Can you critique me on this, to see if I have the understanding right?
I am trying to run the OD SPHERE Wizard. I notice it says to enter X Start to X End .. It looks like X Start would be the Face or set Zero and the X END would be how far into the stock that you would the machining go into the stock correct?
I have a .625 DIAMETER stock
I want to have the WIZARD machine into a sphere/round end at the face of the stock end. I want the beginning curve of the Sphere to be 1/2" distance, which I guess would be Z Start and Z End correct?
So wouldn't I enter: DIAMETER (0.625)
X-Start as ( 0.000 )
X-End as (-.3125) to get to the center of the .6125 Diameter Stock? I am in Diameter Mode.
Z-Start as (0.000)
Z- End as (-.5000)
For Z Clearance I have no idea why this is here because I want there to be CLEARANCE=(0.000) But it will not allow me to enter a 0.000 value as it is < my roughing cut value of (.025)... How do I make No Clearance or Is the Wizard programmed to MUST Have some sort of Clearance?
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Just to clarify which wizard is being used as I need use the same one as you.
I have OD Arc Turning which is in the Lathe Turning Wizards done by Brian / Kiran.
RICH
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Yes it is the exact same Wizard by the exact same people. Thank you
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It is the OD ARC TURNING
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I have attached a pick of the OD ARC Turning.
- Clearance is the amount of pull out of the tool.
- What radius will be put on the end of the stock is determined by the Sphere Dia.
- You can position the Sphere anywhere you want depending on the other inputs.
- If you want a complete half round on the end of the stock then Xend should be 0.0
and see the attached pic.
Watch the graphics area to see what is happening as you change inputs.
BTW, watch how the tool is positioned relative to the round or you will gouge during the machining.
RICH
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O.K>. How should the tool be positioned? SHould I place the tool on the left side of the Quick Change holder post or the Front position. Does it matter?
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It's the tool tip / shape as it relates to the arc.
Gouging is when some part of the cutting tool is hitting the work other than / or in addition to the tool tip.
Scroll thru the gcode and you will see the tool movement.
It starts on the left and follows the curve, thus counter clockwise.
If the tool where a triangular tip and aligned on a 45 deg angle it would be close, but may still gouge depending on the depth of cut.
I don't want to confuse you, but to cut small outside arc's I grind the tool such that it is a point and has radius on each side such that it
can't gouge.
Can you envision the above?
RICH
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I think So.. Like I have a triangle tool, you grind the sides so they have a round shape?
I just ordered an iscar grooving/turning/profile tool. I was thinking of getting the round inserts. Would those do the job nicely? I am attaching a picture of the round bits that I mean
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DOes anyone know if these inserts will cut a ARC profile and do you just touch the center of the circle to X zero as you would an insert with a POINT ?
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A button tool that you show will work. In LT you would provide the radius of tool and the code will be pre-compensated.
Have a look at page 8 of Appendix A and you can see how a tool was positioned to the work.
I would suggest that before spending money on some inserts, create different tools in in LT, using what you have, providing different tool
angles, etc and then generate some pathing. Say you have a triangle tool, you will see that at some angle and using a depth of cut not greater than the actual radius may be satisfactory for what you want to do. You can zoom in / see just how the tool is following the pathing and check for gouging of the tool. Try out the test tool location..........
Note that the tool is not shown to actual size...it will be bigger ..... but, you can still see the tool to stock relationship.
LT provides for gouge protection and will not provide a path into the work if it gouges. So you will see that a Button tool 1/8 radius will no go into a corner with a radius small than the radius of the button tool.
Have fun,
RICH
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If you get into small turning work you will find that you will need some special tooling.
You can create what I call a POINT tool ( ie; a grooving tool of tip radius 0.001" ) having almost zero width so it can get into all the "nooks and crannies" of the profile.
Attached pic shows a point tool made so that it will not gouge for doing small work.
RICH
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Good to know about the small point tool. I think I can grind that out using my HSS blanks. On the OD ARC TURNING Wizard. Is there a way to make the end of the sphere more of an OVAL end shape, or is that wizard strictly for a ROUND radius end?
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It's for a radius end.
There is a Parabola Wizard. Don't remember where or who posted it. Try the Downloads section?
Never tried it though, so not sure how or even if it works.
PIC attached of it.
RICH
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Zarzul did it, be carefull here is the link.
http://www.machsupport.com/forum/index.php/topic,4206.msg30444.html#msg30444
RICH
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Thank you Rich. I am going to try it out tomorrow. I got the OD ARC down! Thanks for the input. Can you confirm something for me. So what I gather is if your just using the master tool , PART/PROGRAM X&Z is always set ZERO right in the middle of the very end of the stock?
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Words and definitions can be be a real PITA when communicating.So sorry for for my ranting
on.
Master Tool definition:
A tool which acts as reference by which all other tool offsets can relate to the master tool.
My master tool is always T0101 and has no offsets. I don't use #0 as the master tool.
SO
If "I" was the "Controller (ie; MAch 3) i could say that all tools relate to the master tool but all tools also relate to each other once they are defined to me.
The master tool can be any kind of tool, some use a tool that can do a facing and turning operation.
My master tool is a piece of ground carbide which can be used to touch off to 4 different surfaces and is never used to actualy machine something.
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The gcode provides instructions to the controller to machnine a part, and should in my opinion, always be based / have it's origin based on the center and very end of the part profile. X=0 is always the center of the lathe and Z=0 is the end of the profile.
"PROGRAM" is used manny times to mean the gcode file used for machining.
Now there are "Program Coordinates and "Part Coordinates". Both are defined in the PDF file posted.
RICH