G18/G19 code

[ommw44]

Hi,

I need to cut a conical or taper shaped circular profile into a block of aluminum. Imagine a tapered hole with the dimensions 4.562" large diameter, 4.262" small diameter, and 2.75" long cut in a piece of material. What I need to do is make a mold on a mill where I will cut half of this dimensioned part into a piece of material. In other words, instead of boring a tapered hole in a part in a lathe and then splitting it in two, I want to make separate halves and put them together. I believe some type of G18/G19 code using a ball endmill will be in order. The following info is provided:

HAAS VF-3 mill
material is aluminum
material size is 6"wide(y) by 2 3/4"long(x) by 5" high(z) as it sits on the machine.

Thanks in advance for your help,
ommw44

[gar]

070408-2128 EST USA

ommw44:

Put your two blocks together, mount on a lathe face plate, then bore on a lathe. This will provide the best surface finish easily .
OR
Put the same two blocks in the mill and do a a circular conical milled pocket. This provides the best alignment compared to separately machining the blocks.
OR
Maybe do the same operation over a 190 deg arc on one block at a time.

These pocket operations would be done under G17 on a vertical mill.

.

[ommw44]

Thanks for your response Gar. I am sorry ,but, I don't think that I made myself clear. I do not want to machine this part on a lathe. I was simply using it to try and let one visualize geometry of the part that I was going to machine. On a vertical VF-3 HAAS CNC I want to machine into a block of aluminum a conical profile. This profile has a radius of 2.281" on the large end, a radius of 2.131" on the small end and a length of 2.75" . If this part was manufactured on a lathe, it would be a tapered hole measuring 4.562" on the large end, 4.262" on the small end, and the length would be 2.75". I was just assuming that a g18 or g19 might be used.

Thanks,
ommw44

[gar]

070409-1117 EST USA

ommw44:

If you do not have a lathe, then that obviously is not an option.

G17, 18, 19 are used to define the plane in which G02 or 03 functions. If you machine a circle (arc) in the horizontal plane you need to select G17. I would expect that you would want the axis of the cone to be vertical and you would make multiple circular paths of varying radii and depth.

.

[Geof]

It should be possible to machine the cone with the axis horizontal by using CAM and the surface finish is going to depend entirely on the nose radius of the tool and the stepover used.

Alternatively, if the machine has macro capability, it should be possible do it with a fairly simple macro. Machine a semicircle for the small end of the taper using G19, step over in X, recalculate the start point and radius and machine another semicircle. Repeat until the final taper size is reached. Again the surface finish will be a function of the tool nose radius and the X steps.

[ommw44]

Geof.

you have more than enough information to answer the question.
I'm interested in seeing if you will answer it. Forums such as this are great as long as there are those with the knowledge such as yourself who are willing to help people (like me) who don't have the experience nor knowledge to answer our own questions.

thanks,
ommw44

[Kiwi]

ommw44
My Fagor controller dosen't have a tapered helix feature, don't know about other controllers.
I have written a Visual Basic program that will generate the code using many G01 steps or G01 to the step depth then G02/G03.
If this is of any use send me a PM.
Kiwi

[Geof]

Geof.

you have more than enough information to answer the question.
I'm interested in seeing if you will answer it. Forums such as this are great as long as there are those with the knowledge such as yourself who are willing to help people (like me) who don't have the experience nor knowledge to answer our own questions.

thanks,
ommw44

I know what should be, or is, possible. I suppose that if I dusted off the old brain cells I could write the macro but these days I walk into an office just down the hall and tell one of my guys to do it.

Kiwi's way is an alternate approach which is more or less equivalent to running a macro external to the machine and recording all the coordinates.

[ommw44]

my, my.

almost a year and still no answer

ommw44

[Geof]

my, my.

almost a year and still no answer

ommw44

You got an offer from Kiwi, you got two suggestions from me, all of which would work, and you have done nothing for a year?

[JROJAS]

HELLO COMUNITY
SOMEBODY KNOW WHO MAKE VIRTUAL SIMULATOR ON MASTERCAM X2 MR2

[Kiwi]

Attached is a program which will generate some code.
Not sure if suitable for your Haas

On re-reading your original post I see you required the 2.75 dim to be on the X axis.
The program has this dim on the Y axis. You may need to re-orientate your material.