G60 unidirectional positioning

[pbo]

Hello to all,

 

I have been reading and lurking for a month or so around here and wow, what a fountain of information this forum is.I work at CBS Boring in Fraser Michigan CBS Boring Homepage

very high production HMCs -OKK 100s and 80s,Makino A99s,Cinci Magnum 800s

Most of the controls are Fanuc 16i and 18i We want to get the G60 option enabled but Fanuc wants 500$ a machine to turn it on. So... Has anyone had experience modifying an mp_easy post with unidirectional positioning??? Our Senior Programmer has a few custom canned cycles for boring, deep gun drilling, backspotfacing that work real well. He is trying to perfect his positioning mods- but every 1 out of 10 posting attempts he loses the positioning moves(10 mm ++)

and tap cycles post as G81 cycles. My post customization skills are not to that level but I am eager to hear(read)all offerings.

 

Thanx,

Pbo

any and all help will be greatly appreciated

[Thad]

I don't have an answer for you Pbo, but wanted to welcome you to the forum. To the boys from Michigan!

 

Thad

[Tim Johnson]

Welcome to the forum.

I've haven't tried to manually program "G60" moves through a post, but my question would be what kind of tolerances are you trying to hold that you would need it on a OKK or Makino? (don't know about Cinci's). If you truly need it on millions of dollars of machines then another couple of thousand shouldn't matter.

[pbo]

We are still trying to come up with options at this time. Actually only one machine has the truly ridiculous tolerances--true position projections of 12" past the 12" bore package depth accumulative error of .0002

this customer has said they want to see how close we can get.

I personally think a vertical spindle Sip type jig borer finishing op. is the only way to approach this, but not suited to high volume large parts.

[Guest CNC Apps Guy 1]

quote:

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...true position projections of 12" past the 12" bore package depth accumulative error of .0002

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I wanna know how they intend to inspect that ridiculous tolerance.

 

quote:

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...this customer has said they want to see how close we can get...

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For every few inches of projected tolerance you should double the price. See how bad they want it then!

 

Man... I did a part that had 6" of Projected Tolerance Zone @ .0008 on a .5000 Dia. and that was bad enough. Luckily it was a Mori. We held .0005 consistently. We used ceramic gage pins to check it.

[pbo]

I think this is another example of design engineers gone mad--we've had 6 different complete revisions, the customer said we should just semi finish all parts and they would handle the finishing. Ha ha that lasted for 5 parts.

 

We are holding +- 15 microns true position on our machines (makinos) now and they couldn't hold +- 30 microns at all.you gotta love it

 

Pbo

[?Mark]

Hi pbo.

Say hello to Nick Chupick for me if you please.

Lost touch with him the last couple of years.

Is he still around? Great guy.

Still doing M1A1 Abrams projects?

 

Kind regards, Mark Banaszak

[pbo]

only alum. side assemblies-no more tank transmissions, we are swamped with Cat flywheel housings of every size, shape, and flavor.

The shop is working 24/7 to meet demand.

2 new okk 100s being installed this week.

Cat job bidding process is killing us--margins cut to the bone--like my boss says " we are shipping a 10 dollar bill with each part" Ha Ha.

There are still a few Chupicks around here.

Since I am the new guy(Marty V. left and I am his replacement)I haven't met everyone yet, but I will pass on the greetings.

Regarding my original question, I'm wondering if this sort of "G60 emulation in post" approach is

possible. The local reseller post guy in the past frankly has not been much help at all. We'll get back to you is what we are told, then nothing.

[?Mark]

Nick was responsible for gov. contracts. Very kind man. The last I heard from him you guys got some several milion transmisions to build .

Please say hi to him if he didn't retire yet.

As far as machines go, you can't go wrong with OKKs. They are as good as Moris.

I don't think G60 is gonna be much help with your problem. As you mentioned before jig borer is a way to go with this kind of tolerance. The key is to put this job on a best machine you got.

Another thing to consider is doing a ball bar test to make sure machine is level and set up properly but don't trust this test completly because it may not show z axis being slightly out of whack. Lastly check how straight the z axis is. We had this problem on our Mori when we run some crazy tolerance parts with long projections. I was shocked to find out how easy it was to adjust this, just a few set screws and the spindle axis was perfect. We didn't even know there was this slight misaligment until we encountered those parts

 

 

Kind regards, Mark