9 replies to this topic

[Joeyls319]

Hello all.

It's been awhile since I've been on the forum so I hope all is well with everyone.  
I have a question about unwinding the B-axis.  I got a part that I'm holding on a vacuum fixture and I need to unwind the B axis after each pass so the vacuum hose doesn't wrap around the fixture during the operation.  I want to do a pass (5 passes in total) and then unwind the hose, then come in and do the next pass.  Can anyone tell me how I can achieve this?  Is there something in the post I can set to unwind at the end of each pass?

The machine I'm doing this on is a Haas Mini mill with a TR110 trunnion.

Thanks in advance.
Joey

[K2csq7]

Welcome back!
What type of post?
This is from MPmaster

frc_cinit   : 1 	#Force C axis reset at toolchange

You may have to force a toolchange between passes....

There is also this...

one_rev 	: 0 	#Limit rotary indexing between 0 and 360? (0 = No, 1 = Yes)

Not sure how that one works, never had the need to use it.

Also, what kind of toolpath? If each pass is a seperate toolpath, a point toolpath between the cutting paths should get you there. Or even simpler, a manual entry toolpath as code...

[mmkgreen2005]

Try this:

To unwind the B-axis:

After the Z move…
G0 G91 G28 B0.
G90

Example:

G0 Z5.9392
G0 G91 G28 B0.
G90

This worked for me after I wound the B axis up on a trunion table and didn't want to wait for it to unwind.

Matt. :nuke

[Joeyls319]

Forgot to mention I'm using the Generic Haas VF-TR_Series 5X Mill post.

I don't see where I can limit the rotation to 360.0° but I will keep looking.

[K2csq7]

Joeyls319, on 25 June 2012 - 01:18 PM, said:

Forgot to mention I'm using the Generic Haas VF-TR_Series 5X Mill post.

I don't see where I can limit the rotation to 360.0° but I will keep looking.

You have these in your post...


#Force rotary axis reset at toolchange and other options

frc_cinit	: 1
typ3_brk_evn : 0 	#Windup limit, use even revolution break position
				 	#Primary and/or secondary

And you also have....

#Rotary axis travel limits, always in terms of normal angle output
#Set the absolute angles for axis travel on primary
pri_limlo$   : -9999
pri_limhi$   : 9999
#Set intermediate angle, in limits, for post to reposition machine
pri_intlo$   : -9999
pri_inthi$   : 9999

#Set the absolute angles for axis travel on secondary
sec_limlo$   : -120
sec_limhi$   : 120
#Set intermediate angle, in limits, for post to reposition machine
sec_intlo$   : -120
sec_inthi$   : 120

Wish I could be more helpful, but I don't have time to test this stuff today.

entering mmkgreen's suggestions in a manual entry path as code may be the way to go.
Have you contacted your reseller? They should be able to make something simple like this happen for you in no time at all.

[Joeyls319]

Thank you.

I got somethingto post out which looks like what I'm looking for.  Now to go out and see if it's right.

Thanks again for the assistance.

Joey

[K2csq7]

Joeyls319, on 25 June 2012 - 01:49 PM, said:

Thank you.

I got somethingto post out which looks like what I'm looking for.  Now to go out and see if it's right.

Thanks again for the assistance.

Joey

Let us know the solution you found so future readers can benefit.

[JAMMAN]

Joeyls319, on 25 June 2012 - 12:40 PM, said:

Hello all.

It's been awhile since I've been on the forum so I hope all is well with everyone.  
I have a question about unwinding the B-axis.  I got a part that I'm holding on a vacuum fixture and I need to unwind the B axis after each pass so the vacuum hose doesn't wrap around the fixture during the operation.  I want to do a pass (5 passes in total) and then unwind the hose, then come in and do the next pass.  Can anyone tell me how I can achieve this?  Is there something in the post I can set to unwind at the end of each pass?

The machine I'm doing this on is a Haas Mini mill with a TR110 trunnion.

Thanks in advance.
Joey

Hi Joey,

I wasn't aware a trunnion would fit on a mini mill, would be interested in seeing how much room you have left under the thing and the range of part sizes you are making. If you have some time and it isn't proprietary parts I would like to bat a few e-mails back and forth with pics,

Jim

[Joeyls319]

sure thing.  I cant get a picture of the part but I should be able to get one of the set-up.  I don't think therte is going to be a whole lot of room.

[JAMMAN]

Thank you, we bought another mill just assuming our minimill wouldn't have room for a 4 and 5. Not enough time to change our minds now but the future can change things in a day.