Centroid Community CNC Support Forum

Got it. So if both inputs are on input 6, if the TT has a softer spring and triggers first, it will work stop when the TT is triggered?

Yes it will.

On my setup the TTO is stiffer, so I use this to measure with a tool in the spindle and have a solid block of the measured length to set up the 3D Probe offset.

I have only one plug on my mill an using it with TTO and Probe. It one of these is plugged in Probe Detect will be set to activate the protection.

Uwe

Thanks. I will give it a try.

In most cases the TT has the higher spring load than the TP so when the TP is touched off on a TT, it will be the TP that trips. With a few exceptions, the pre-trip travel of a mechanical TT and TP in the axial direction is within 1-2 micro meters (0.00008") and can be neglected. This is definitely the case with all the probing devices that Centroid is selling.

If you don't believe me, put the arm of a dial indicator on the side of the TT stylus and slowly jog down a tool onto the TT. You will see that by the time the dial indicator shows a movement, the trip signal will occur immediately. So in most cases it is absolutely no problem to touch off tools and the TP with the TT.

I only know of one wireless TT (Model DT02) device which is very popular that does have significant pre-travel.

If you are still unsure, I recommend you do the following test:

- Remove the option for special TP measurement in the ProbeApp configuration
- Set the Reference Height with T200 that you have selected as your Reference Tool
- Measure the Height Offset of your TP
- Use a 2x3 block or a piece of stock, place it on the machine table and use the TP to set WCS Z0
- Load T200 and jog it to the side of the 2x3 block
- Open the MDI and enter the command T200 G43 H200 G90 Z0
- Now the 2x3 block should fit exactly under T200. If it doesn't, your TT might have pre-travel.

Keep us posted of your findings.

-swissi

Thanks Swissi. I believe I used your recommendation some time ago and have had no issues at all. I was just trying to jog my memory as I am helping another user with his setup.

Best... Richard

Ok that is why my case is different.

My TTO is inductive with more than 1mm pretravel.

Uwe

Hello Swissi,

Quick question. I was just reading your probing calibration options. Is there any negative to doing the Precision Probe Calibration? From what I understand, this method measures the error in measuring the four quadrants and applies the know error when making measurements.

Lastly, am I correct that you do not have to perform the standard calibration if you are going to do the precision method?

Thanks... Richard

Richard

There is no negative at all in conducting Precision Probe calibration. After calibration, you will always have the opportunity to use either Standard or Precision mode when probing

Best advice is yes you should perform standard calibration first as this sets up the "derived" probe diameter as distinct form actual diameter. This only takes a few seconds in CHIPS which should not be a problem