6 Way Probe Mod

[DAN_M]

Hi all,

Couple of questions regrading the 6way star mods...

1) I use TesastarMp_US modules. Would I be able to use a 6way TP20 on my machine? I am not seeing a 6way mod online that is specifically for Tesastar.

2) What sort of accuracy are you seeing on these? (I am really hoping to be able to hold ±0.002 with this mod. Ideally I'd like to make a 20mm ext, a 5 way star, then a 1X10 sticking out of tip 3)

[acgarcia]

how does a 6way work?

[DAN_M]

idk check it out

https://www.renishaw.com/shop/Product.aspx?Product=A-1371-0419

[Schlag]

6 way is for a complete star probe. You can measure x-y-z- + and - from all 5 tips / directions. ( 1 probe at all the 90's and 1 facing straight down like standard probe )

[louisd]

Yes, Hexagon TesaStar's are interchangeable (rebranded renishaw) with TP20

Renisaw TP20 data sheet: https://www.renishaw.com/en/tp20--6670
Says the 6W is about 2x worse than standard force in repeatability (0.00004") and only 0.00004" worse in pretravel variation.


I have an old spec sheet, with other data:

TP20 probe technical data
NOTE: For further information on the TP20 probe, refer to the TP20 system installation and user’s guide (Renishaw
part number H-1000-5008), available through your supplier.
NOTE: The following data is derived from high accuracy test rig measurements and may not represent the
performance achievable on a CMM. Please consult you CMM supplier for overall system accuracy information.
Performance at 10 mm stylus length

(You'll have to CSV this or something to read it better, it's in a table that i can't paste. I BOLDED the 6W data)

Parameter
Probe module type
LF SF MF EF 6W EM1 STD EM2 STD
Unidirectional repeatability* (2σ) 0.35 μm 0.35 μm 0.50 μm 0.65 μm 0.8 μm 0.35 μm 0.35 μm
2D (XY) form measurement deviation* ±0.6 μm ±0.8 μm ±1.00 μm ±2.00 μm ±1.5 μm ±0.8 μm ±0.8 μm
Measured at trigger speed of 8 mm/s.
Test stylus ball Ø4 mm.

Without extensively testing it, I presume your uncertainty of that probe module will be about 0.0001" worse than the uncertainty of a standard force module.

[bfire85]

We use a 6way. StdDev on my normal A0B0 probes are about 0.001mm whereas my star probe is anywhere from 0.002mm to 0.003mm.

[acgarcia]

Other star probes and builds can’t check under cuts or take hits in Z- as good unless it’s a 6 way?

[louisd]

That's correct. TP20's do not have the ability to open the circuit (detect a point) in Z-. If you are probing with a TP20 w/star probe on any other module, you are detecting the hit when the probe travels enough to open the circuit in X or Y, on the opposing side of the module from where you are taking the hit.

[acgarcia]

Thanks for the clarification. i'm going to have to think if I've done this before. I tend to use extended force modules so its a bummer that the max length of the 6 way is 30mm.

[A-machine-insp]

We run the TP20's exclusively and we use the 6 way mods for angle probes. Typical STD Deviation is .0001"-.0003" all day long.

[DAN_M]

louisd

I just got a 6 way probe. Set it all up. My machine won't get it from my rack =/ I have no idea why. Are you positive that I can use this?

My usual setup: HH-A-T5, HA-TM-31, TesastarMP_Body_US
What I built: HH-A-T5, HA-TM-31, Probe TP20_6Way, 20mm ext, 5way test star, 1X10 in tip 3

I my new probe in the rack, told the rack it was in a port, when I tell PC DMIS to get the tool it wants me to hand load the probe

[louisd]

Did you assign the probe to the rack position?
If so, and it didn't save...

I came to the same roadblock when I tried to use a TP20 MCR20 rack to hold TP200 modules. It's Hexagon/Renishaw's ploy to mandate you to keep in-family components. Even though the TP200 physically docks/undocks with success on the MCR20, they essentially utilized this software-lock to force us to get PI200 racks.

Create the 6-way probe as your normal TesastarMP_Body_US, and you should be fine. Unlike the TP20/TP200, your physical dimensions between the TesastarMP and the TP20 should be identical. The difference is internal to the module. There is nothing different between a TP20 SF and a TP20 6way, in regards to how the software considers the probe, but there might be a sw lock on using a TP20 on whatever branding the Tesastar Rack is.