DMG-Mori NXH4000

[Travis_Buchanan]

I have recently been tasked with going through our machine shop and try to improve the processes.  I am now focused on our DMG horizontal with a 6 pallet pool.  Mitsubishi control on this machine.  Control is not currently equipped with G54.2 or G68.2, DMG has quoted me these options.

Currently the programmers are probing the part for each orientation of B axis and using a crap ton of work offsets. 

I think G54.2 will allow to set only one work offset per part, and track this work offset around the center of pallet rotation.  (Personally I have never used this option before)

Is there any use/advantage of using G68.2?  Can G68.2 be used in place of or in conjunction with G54.2

On our Matsuura 630 horizontal I use only G68.2 and it tracks about pallet center of rotation. 

Looking for best practice here.

[JParis]

What kind of work is being done on these machines?  Low volume? Production? Stock? ie, cast, forged, billet, extrusion?

Our HMC's are all high production, tombstone quantities vary from 4 parts per tombstone to 100 parts per tombstone...

I created my post to output all of the necessary offsets. The preference here is to be able to control each part. 

Since on a single face of a tombstone, it will many times have multiple parts, the X & Z offset values are the same with only the Y being different.

G90G10L20P101X0.Y-6.2173Z-18.441

G90G10L20P102X#72001Y[#72002-7.32]Z#72003

G90G10L20P103X#72001Y[#72002-14.640]Z#72003

Updating a single offset on part 1 updates the others as well.

We have a lot of older legacy tombstones that have a single offset per face and multiple parts. These parts can be difficult for the operators to keep everything in tolerance as the tombstones and plates are all aluminum and many are worn....

It depends on what is needed and required.

[Travis_Buchanan]

Typically our parts are weldments or sawn bar stock.  We typically machine 3 face on op 1 and the remaining 3 faces on op 2.  We bought 4 Toolex tombstones for vise work and use custom fixturing for the weldments on the other two pallets.  We may have up to 8 parts per pallet.

I understand that I could probably set semi-permanent work offsets up on the vises.   We are doing in process probing on everything right now. My goal is to try and use G54.2 and use only one work offset per part.

 

[JParis]

18 minutes ago, Travis_Buchanan said:

My goal is to try and use G54.2 and use only one work offset per part.

In the scenario that you are needing, probing makes sense. The G54.2 in my very limited knowledge it, I believe it has a limited number of shifts that can be set...but I could be WAY out in left field on that one. 

[Travis_Buchanan]

I went ahead and ordered the G54.2 option.  I assume I could probe a tooling ball at B0 and B180 to find the exact center of rotation.

I believe there are 8 offsets available with G54.2

I will set the theoretical with a G10 L21 Pn through manual entry and then probe for actual.

As with the other machines I have set the standards on, we will set some rules for consistency.

B0=P1&P2,  B90=P3&P4, B180=P5&P6,  B270=P7&P8

 

[cncappsjames]

Had to set the #19700 and #19702 parameters on an Enshu yesterday. These are what is necessary for G68.x to function.

I brought a tool into the spindle, made a light depth cut by handle jog at B90 and again at B270 (it was a 2 sided tombstone) near the top with Z at the same depth. Rotated to B0, probed an X web cycle, set center as X0 (work offset). Rotated to B90, set Z Offset as 1/2 the measured web to force offset to center of rotation. Took those numbers, converted to metric values and input into appropriate parameters. Y doesn't matter.

If my machine would have had G54.2 (Rotary Table Dynamic Fixture Offset in FANUC-ese) I would have written the X and Z to the COmmon Work Offset or a standard work offset. There's advantages to both but that's another discussion. Then you input the value from the Common Offset/Work Offset to your part origin in X, Y, and Z and it should track. Not sure how Mitsubishi Techs handle Option Installs. Typically FANUC will only install the option and it's up to the builder to setup/configure the option. On a FANUC the configuration parameters need to tell the control primary and secondary axes, which axis is the function rotating around and what the theoretical axis/es are.

HTH