[pbd1971]

Hi to you all, we have a small problem with the TL1 Lathe. When we power it up on a morning, sometimes it has problems referencing the Z axis, the saddle will move slowly in a Z+ direction as it should but then instead of stopping, the saddle will then creep forward in a Z- direction and would not stop unless we hit reset. This happens occasionally but the real problem is, we are finding that all the tools seem to be loosing their Z axis offsets on a regular basis, like every time we power off and on.

We are finding that the Z value for the same tool changes every time we power off and on, this combined with the "Z- saddle creep" makes me think it could be a problem with the home position referencing.

I am sure it is something simple like a piece of swarf on the limit switch which is causing the problem but i don't know how to find the switch. Could someone tell me where it is?

Many thanks

[Geof]

Look behind the bed toward the tailstock end and you will find the proximity sensor. Your problem is almost certainly due to a build up of chips in the metal trough that runs along the back of the bed. I will try to find the picture I posted years ago about this problem.

Here we are: http://www.cnczone.com/forums/haas_l..._position.html


The pictures were taken from the back of the machine.

[pbd1971]

Thanks Geof, got it sorted.

[haastec]

Thanks Geof, got it sorted.

So was the issue chips on the switch? It is always nice to hear what the solution to a problem is.

Also, it is helpful when someone searches for a similar problem down the road.

Glad you got it figured out though.

[pbd1971]

So was the issue chips on the switch? It is always nice to hear what the solution to a problem is.

Also, it is helpful when someone searches for a similar problem down the road.

Glad you got it figured out though.

Yes, that was the problem, lots of swarf and acetal dust all over the switch. We gave it a good clean down and so far, no more problems.

Thanks

[Beto86]

Make sure to do it on the x axis as well