Horizontal Programming

[cunder]

Here there is not much production at all, so programming is from part zero. I also use a macro for rotation position. Lets say "X", "Z" zero is a certain position at G54 and B0, and I want the same zero position on the part at B27.5° and use G55, I enter the first offset in the macro and the new offset to use with the destination angle and macro will calculate and enter the new values into the work offset. This works for any angle very well but the exact center of rotation of the table "X and Z" from the machine home position must be known. Setting up the macro will also depend on how the tool length and work "Z" is being set. (as in (+) or (-) tool length/work values.

[Len Wilk]

I also retract to a couple of inches from the farthest fixture point, much safer than leaving it up to the operator.

[Slixmix]

A little off topic but seems there's some knowledge here. On our Mori NH-5000 we designed some fixturing to locate on the center bore of the pallet base using a Carr Lane spud that is made for locating to center of rotation. We mounted the fixtures, started to indicate stuff in and found it wasn't rotating in the center of rotation. Took off the fixtures and ran an indicator on the pallets center bore (where the spud slip fits) and it is running out from .0008 to .0045 on 3 different pallet bases. Is this normal? We're trying to find out if there is a certain spec for these. It would defeat the purpose of buying pre-fabbed tooling if the pallet is not running true to the machine in the first place.

[Joe788]

I'm not sure how common it is for the DIN pin hole to be that far off. Do you have the regular edge locators as well? If so, are they off an equal amount as the center bore? .0008 seems reasonable, but .0045 is a ton.

 

A buddy of mine bought a 12 pallet 800mm cell, and stipulated in the PO that the center locator for each pallet needed to be within .xxx of center of rotation. The center locator is on an adjustable plate, so the service techs just dialed each pallet in after the install.

[Slixmix]

They are blank pallets right now so I'm not sure about the side locators. I'll look into that. Thanks Joe.

[Joe788]

They are blank pallets right now so I'm not sure about the side locators. I'll look into that. Thanks Joe.

 

The center pin thing is a little more old school. A lot of machine now don't even have it any more, though some machines have both. If you're changing the tombstones with any regularity, you'll like the edge locators a lot better. Here's what the edge locators look like:

 

 

They are also a standard size and location, so virtually any 500mm tooling you buy, will have the edge locator holes in the right place. If they aren't already on the machine, they might be tucked away safely somewhere with the shipping brackets and other crap that goes with the machine.

[MotorCityMinion]

"Took off the fixtures and ran an indicator on the pallets center bore (where the spud slip fits) and it is running out from .0008 to .0045 on 3 different pallet bases. Is this normal? "

 

I've never worked on a Mori HMC but my guess would be NO.

 

Mazak pallets had a ground center hole that received a plug for locating the center of the fixture, as well as the side pads.

 

One thing to check. With the variation from pallet to pallet you're seeing, I doubt pin alignment would be the lone culprit.

 

Are the alignment pins in the machine parallel to Z? Are they on center in Z? Rotate 180. and check. Are they symmetrical in X? Check at 90 and 270.

 

I've seen parts / fixtures gets crashed and throw the pins out of alignment in the machine. A cheap fix was to break the fixture free and re-align it to the new pin location. LOL, pretty ignorant solution as this forces every pallet to be tweaked. Other guys change the WPC for the machine, another bad idea. If lucky, sometimes the pins can be loosened then tightened up again and will fall into place. Other times they need some persuasion.

 

The pallet that checks out by .0008, does it repeat at .0008? How about the others?

 

Chips under the pallet on the pads and in the pin bores can wreak havoc on repeatability as well. Keep 'em clean.

[Craig-B]

I always use pallet center, we find the pallet center for each pallet on our Mori Seiki NH5000, and set that value in the common offset on the control, but set work offsets for each loading that are calculated from the center to the part zero and this value is set by (G10) at each rotation or with a macro subprogram. This way the program matches with the print for checking the theoretical if needed and you can check the values very easy.

Note: If you set it up in Mastercam correctly it will give you all the (G10) work offsets values needed. My old post output the (G10) at tool change and null tool change, now I have it setup with a choice using a (Misc. Integer) 0=None 1=G10 2=Macro subprogram call.

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O4205(EXAMPLE PROG.)

G0G17G21G40G49G80G90

N36T9036(101050 INSERTED MILL)

M6

G65P4305B270.(COORDINATE ROTATION) ---------->Or G0G90G10L2P1X-2.846Y121.946Z132.390

M11

G0G90G54B270.

M10

G0G90G54X200.7Y15.35S344M3T9038

G43H99Z138.

Z35.7M8

G1Z35.41F225.

G41D99X175.3

X109.623

X102.433Y29.55

X100.64

Y.5

X102.211

X109.275Y15.15

X175.3

G40X200.7

G0Z138.

G0Z200.

G65P4305B304.(COORDINATE ROTATION) ) ---------->Or G0G90G10L2P1X-76.338Y121.946Z108.209

M11

G0G90G54B304. X-26.197Y61.925

M10

Z147.001

Z99.501

G1Z93.727

Y-1.395

G0Z99.501

G0Z225.

G65P4305B0.(COORDINATE ROTATION) ) ---------->Or G0G90G10L2P1X-132.390Y121.946Z-2.846

M11

G0G90G54B0. X-65.Y33.75

M10

Z225.3

Z177.8

G1Z175.8

X-15.

Y-3.25

X-65.

G0Z225.3

Z225.

G0M9

M5

G0G91G30Z0.M9

G0G91G30X0.Y0.

M01

 

Example Macro subprogram

O4305(COORDINATE ROTATION PALLET A)

IF[#147NE1.]GOTO500

(COMMON OFFSET)

G0G90G10L2P0X-280.000Y-640.000Z-730.000

GOTO#[2]

N360(0. DEGREES)

G0G90G10L2P1X-132.390Y121.946Z-2.846

M99

N270(270. DEGREES)

G0G90G10L2P1X-2.846Y121.946Z132.390

M99

N304(304. DEGREES)

G0G90G10L2P1X-76.338Y121.946Z108.209

M99

N500(ALARM 20)

#3000=20(WRONG PALLET FOR PROG.)

M99

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