640M fixed tapping retract feedrate

[kendo]

can I increase the feedrate during the retract motion in a fixed tapping cycle?

I can't find a parameter for it

this Would be useful on the 640T as well

[kling8]

No you can't, or shouldn't that is what the fixed means in a fixed cycle,
Why do you want to?

kling8

[kendo]

OK I found parameter K90 which can be set from 1-999 to adjust the feedrate of the retract as a percentage of the in-feed rate

So I set it to 300 (it was 100)

It also says bit 6 of parameter F94 must be set to 1 for this to be valid, which it is....

but it didn't work

I reduced the C-SP for the cycle down to 5 so it had plenty of time to max out while I was watching it, but it stayed at 5 all the way in and out

[kendo]

uhh, because every other machine I've run could be set to retract faster than the cutting rate

I guess "feedrate" may have been the wrong word, I'm really trying to up the spindle speed on retract while the IPR remains the same

[kling8]

Sorry man didn't mean to give bad advice I have seen and ran alot of CNC's through my years and I have never seen one that does that. And I cant think of any point and time where I would want to change it.
So good luck hopefully it works...

[kendo]

ahhh, now I see....

parameter K90 only applies to EIA/ISO programs

Thats weird.... why can't I up the speed for a Mazatrol prog?

[kendo]

it only saves cycle time, and the setting is usually kinda obscure on most machines

I once cut a cycle down from 3:45 to just under 3 minutes by tripling the retract rate, it was tapping 24 holes total in 12 parts per side of a tombstone. This was a production run that demanded over 100,000 units annually.

I was applauded for digging up the parameter for this on Okuma horizontal mills at the time.

[bildoo]

On the tool data page, I believe under the tool length there is a box for the return rate percentage. You can put in 0-255% of the inspeed for the return. So if you tap at 25 sfm in at 250% it will come out at 62.5 sfm. (with a max of the top rpm of 1st gear (~980 rpm ish)). The feed fate will stay the same because it has to or the tap will break. I am unsure if this applies to the lathes.

[kendo]

THANK YOU

now Im retracting at 5x the in-feed rate

the setting was cleverly hidden, at first glance, the tool data heading is "Thrust Force"... only when you scroll to it does the machine tell you in the bottom right corner of the screen what it really is....sneeeaky