transfer chuck move comes up .030 short?!

Hey all. This has always been a regular thing but now im tired of it. After going through the regular routine of setting a transfer i always have to subtract approx. .030 to the W1 offset to get the sub spindle to put the part right up against the main jaws.

I dont know that I totally understand what you are meaning... You are transferring to the main or to the sub? In that, you have to tack on an extra .03" to get it to button up tight on every transfer?

Btw, what control?

John,

I think W-axis home position is incorrect. What machine and control?

John Standley

I had this problem on our Matrix control, only on a couple of programs that I wrote when the machine was new , prior to that I only programmed our other machine which was a MT PRO, after phoning tech support and asking what they thought was going on I was told to pay close attention to PUSH or NO PUSH....... it turned out that I had said PUSH. which means if you don't have the parameters set up for push it will stop approx 1mm (0.0394") away from the Z zero face on HD1.

Just double check you want NO PUSH

Rodzilla

Rodzilla,

Why would you not want to use push? Its a near flawless system to be sure the sub 'pressures up' and get proper contact on the jaws.

If you dont use it, how do you control the sub spindle grab point accuratly?

In theory PUSH is used to ensure the reapeatability of parts of you have some wear on the facing tool used in the ehad for the first op.

I've never found the need or desire to use PUSH in a transfer, I simply teach the transfer positions and the transfers, and effective part length are always bang on. In fact I almost always leave a bit of clearance in Z on the pick off jaws so the part doesn't get marked or distorted as the jaws close on it.

If you teach the transfer positions and use no push you should get the same predictable results time after time. If tool wear changes the parts dimensions, that's what tool comp is for.

I agree with Stuart
In fact when I took the mazatrol training coarse in Kentucky they actually teach you NOT to use Push.
Just teach the W axis where to come to and it will come to the exact position every time , after all it is just another axis controlled the same way all the other axis's are controlled so repeatability should be bang on . like Stuart said anything else should be adjusted with a wear comp.

however having said all that , there is probably nothing wrong with push. I just don't find the need.

Rodzilla

yes this is on a matrix control and i am transfering to the main from the sub. push is on. does anyone know what parameter off hand to adjust the push?

John Standley

there are quit a few parameters to adjust the push, is this the first time you are using push?

Rodzilla

Well, the whole thing started when i started using the machine again after about 8 months of not using it. All the programs i wrote before the machine sat work as they should using push. All my new programs that use push ive had to make the .030 adjustment to. I dont have to use it but im just concered about the day i have a need for it and its not working right.

so do all the old programs work correctly?

Yes....thats what has me a little puzzled. the only thing i can think of is that each program holds parameters for transfers, kinda like it does with T.P.C. . i could be totaly wrong though.