DP-4 Fast feed rate with short stylus

[Nigelo]

I have a 20mm Renishaw carbide/ ruby available for a specific job coming up and do not want to damage the Probe.

Am I correct in assuming Max fast feed rate of 30ipm needs reducing by 50% for 20mm stylus instead of standard 40mm length?. Slow speed unchanged of course

TIA

[swissi]

I have a 20mm Renishaw carbide/ ruby available for a specific job coming up and do not want to damage the Probe.

Am I correct in assuming Max fast feed rate of 30ipm needs reducing by 50% for 20mm stylus instead of standard 40mm length?. Slow speed unchanged of course

If 30ipm works well with your 40mm styli I don't see a reason why you should reduce the fast probing feed rate for the 20mm styli. The over-travel distance based on the latency of the Acorn Input should be well within the travel range of your touch probe even with a shorter styli.

I would be more concerned about the slow probing feed rate as this does actually impact the accuracy. Given the approx. latency of 5 milliseconds of the Acorn Inputs, a feed rate of 5ipm lets your machine travel about 0.01mm in the time the probe trips and the time Acorn actually recognized the trip signal. Anything faster will add to that latency error.

My recommendation is to keep the slow probing feed rate very low to eliminate any latency errors in the measurement and rather reduce the retraction distance to a minimum to save probing time.

-swissi

[Nigelo]

Thanks swissi, well noted. I had not considered shortening retraction distance but makes perfect sense