Touch Force

[shays]

How do I determine the actual touch force of the probe to the part during measurement?

[BSchwark]

What kind of Machine/probe are you using?

BS

[shays]

I have a B&S MicroXcel DCC machine, with a PH10T / TP20.
Thanks!

[bw_bob]

Are you talking touch speed or the velocity it takes to set off the probe.

[John Kingston]

Do you mean how do you adjust touch speed or how can you measure the grams of force it takes to trigger the probe?

Touchspeed is in settings or parameters. I use 1% for everything. They sell gages for measuring the force. You also can look at the specs for the probe modules have (TP20, TP200 , Etc.)

[shays]

I would like to know the velocity / force that triggers the probe. I am working on a project now, where the impact of probe contact may have an effect.
Thanks!

[bw_bob]

That is usually factory set to a certain standard.You could probably go on the website and call up the TP your using and find out that info.

[shays]

Would machine acceleration and/or move speed be a factor in this?
Thanks!!

[John Kingston]

I looked at the book that came with my TP20s. All it mentions is medium, standard, and extended force. Color coded in order; black, grey, brown.

[craiger_ny]

There are gram gages that will measure that. It will tell you the force required to trigger your ttp.

[JamesMannes]

TP20 Standard Force...
xy=8g
Z=75g

TP20 Medium Force...
xy=10g
Z=190g

TP20 Extended Force...
xy=10g
Z=320g

Reference Renishaw Technical Dat Sheet H-1000-2064-01-A pg. 4

Hope thats what you wanted

[shays]

I have found some info in the Renishaw catalog. It says that a medium force TP20 has a trigger force of 0.08N XY & 0.75N in Z. It also mentions an "overtravel force"...does anyone know what that means? Thanks!!

[shays]

James - thanks for the info, this may be what I'm looking for. Can this datasheet be downloaded from the Renishaw site?
Thank you!

[JamesMannes]

I would imagine so. I have a copy given to me by the Renishaw guy (its' on a thick paper so I know I didn't download it). That's why I included all pertinent info.

[craiger_ny]

I have found some info in the Renishaw catalog. It says that a medium force TP20 has a trigger force of 0.08N XY & 0.75N in Z. It also mentions an "overtravel force"...does anyone know what that means? Thanks!!

Like James said 0.08N = 8.1577297g, 0.75N = 76.4787160g
I wonder what the acceptable ± tolerance is? My guess is the module probably goes bad for reasons other than the strain gage first but I have nothing to back that up. Modules are nice but I like the "tunability" of the old TP20s and the TP2s, at least for manual machines it is nice to be able to tune it. For DCC I suppose it is less relevant to have to adjust asside from changing modules.

Craig