Post Processor for Yama-Seiki GLS-2000LM

[Anonymous]

I am looking for a Post Processor for my Yama-Seiki GLS-2000LM... 2 axis with live tooling. I downloaded the Haas Post Processor for the ST-20SS and have hacked it to fit my machine. It works...kind of... Live tooling makes oval holes when working radially on the part though. Tapping cycle is interesting too but have not had time to modify it yet. Was curious if anyone has made a post for this machine or something like it?

Controls are Fanuc Oi-TD

Thanks for any help!!

-John K

[Laurens-3DTechDraw]

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@Anonymous wrote:

I am looking for a Post Processor for my Yama-Seiki GLS-2000LM... 2 axis with live tooling. I downloaded the Haas Post Processor for the ST-20SS and have hacked it to fit my machine. It works...kind of... Live tooling makes oval holes when working radially on the part though. Tapping cycle is interesting too but have not had time to modify it yet. Was curious if anyone has made a post for this machine or something like it?

Controls are Fanuc Oi-TD

Thanks for any help!!

-John K

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Milling a hole radially will always make a oval hole.

[Anonymous]

Yama uses diameter values for X axis in polar coordinate, Haas uses radial values.Oval holes are result of wrong X values generated by Haas post.

[Laurens-3DTechDraw]

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@Anonymous wrote:

Yama uses diameter values for X axis in polar coordinate, Haas uses radial values.Oval holes are result of wrong X values generated by Haas post.

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That's true for axial machining.

But radial without a y-Axis will always be oval holes when milling the hole in my opinion.

[Anonymous]

Well I see there was a little bit of a mixup on my part. I was referring to axial milling and polar coordinate.

As for radial milling, machine having only C axis can only produce hole on Y0 location, having no Y axis makes it impossible to mill a hole off center, I can only drill holes that are pointing to center of the part, hole is round and the size of tool being used.

I can also mill a strait or spiral slot by rotating C axis or driving both C and Z axis simultaneously, but I can't see where definition of "oval hole" comes in on a lathe not having Y axis.

Considering physical limitation of such machine, it is not matter of opinion but rather a fact, some features are simply not possible to execute. 

If hole is not round, any other shape is result of unstable tool and associated problems, such as not using spot drill or having misaligned turret. 

[Laurens-3DTechDraw]

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@Anonymous wrote:

Well I see there was a little bit of a mixup on my part. I was referring to axial milling and polar coordinate.

As for radial milling, machine having only C axis can only produce hole on Y0 location, having no Y axis makes it impossible to mill a hole off center, I can only drill holes that are pointing to center of the part, hole is round and the size of tool being used.

I can also mill a strait or spiral slot by rotating C axis or driving both C and Z axis simultaneously, but I can't see where definition of "oval hole" comes in on a lathe not having Y axis.

Considering physical limitation of such machine, it is not matter of opinion but rather a fact, some features are simply not possible to execute. 

If hole is not round, any other shape is result of unstable tool and associated problems, such as not using spot drill or having misaligned turret. 

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If you try to mill a hole with XZC axis radially you get a tapered oval hole I believe.

That it's not something you normally do doesn't mean it can't come in handy sometimes. But it just doesn't produce a straight hole indeed.

[Anonymous]

In my 29 years of running lathes and mill-turns I have never attempted such a thing, why?, because machine not having Y axis cannot produce radial hole of same diameter at top and bottom of the hole.

The reason is because tool always remains on Y0 location, rotating C axes and driving Z axis does not change that fact, therefore it is impossible to produce round hole of same diameter at top and bottom edge of a hole.

Just because it is possible to produce some form of hole it doesn't make it usable in producing controlled shape features on work piece, you can really only produce a cone with two different diameters at each end, inner diameter gets smaller and smaller as tool gets closer to X0 or part center line.

Sorry but I still don't see where "oval hole" fits in other than to say it is possible to produce a hole of such dimensions that I have not encountered in past 29 years on any of the parts I made, and I made a few.

[Laurens-3DTechDraw]

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@Anonymous wrote:

In my 29 years of running lathes and mill-turns I have never attempted such a thing, why?, because machine not having Y axis cannot produce radial hole of same diameter at top and bottom of the hole.

The reason is because tool always remains on Y0 location, rotating C axes and driving Z axis does not change that fact, therefore it is impossible to produce round hole of same diameter at top and bottom edge of a hole.

Just because it is possible to produce some form of hole it doesn't make it usable in producing controlled shape features on work piece, you can really only produce a cone with two different diameters at each end, inner diameter gets smaller and smaller as tool gets closer to X0 or part center line.

Sorry but I still don't see where "oval hole" fits in other than to say it is possible to produce a hole of such dimensions that I have not encountered in past 29 years on any of the parts I made, and I made a few.

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We have done it often enough to just make a hole in a tube that was too big to drill but didn't need vertical walls. Just for clearance it was easy enough to do and works great for the need of the part. 

(With a ball endmill you should be able to surface a hole to the same diameter at the top and bottom though if your machine and CAM are capable.)

[Anonymous]

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(With a ball endmill you should be able to surface a hole to the same diameter at the top and bottom though if your machine and CAM are capable.)

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In other words,.............. only if machine has Y axis, in which case ball end mill would not be needed,.......  unless I want to produce hole of different diameters at top and bottom edge or having some odd shape not achievable by flat end mill.

Look, making a clearance hole of unimportant and arbitrary shape should not be confused with how C axis work and what it is capable of doing.

Finding ways around obstacles is part of my day too, but I cannot overcome not having Y axis by being innovative and clever, Y axis is just not there, therefore, I can't do features that require having it.

Now if you want to elaborate on machine's capabilities above and beyond their intended design and purpose than I have seen lathes being used as punch presses, grinding machines spot-welding machines and more,...... not necessarily intentionally or successfully.