Custom Rapid Overrides

[ducesrwld]

On most older machines the default for rapid overrides seem to be 5, 25, 50, and 100%. Anyone messed around or looked into trying to "customize" the override settings? Most of my machines have some miles on them and usually run them at 50%. There are some jobs that make a considerable difference and will crank em up to 100 when it makes sense. Otherwise I like to focus on getting more parts under the spindle and taking it a little easier on the old girls using my dome to make the machine more efficient vs running em harder.

What I'd really like to change or see more useful is finding a nice sweet spot where 50 ain't cutting it and would like to bump it up to a happy medium 75% which doesn't exist on any machine I've ever run.

Any guys been down this road or have some answers....

 

[Myrmidon]

All my machines, rapid % is controlled by the feed % knob

When I've run machines that had a hard rapid override, and I didn't like it, I just changed the parameter for rate.

If you felt so inclined, say you wanted it to be half on most jobs for whatever reason you could change it, iirc you can even write a macro statement that changes it on by job basis (Fanuc 31i you could atleast)

 

[EmGo]

What I'd really like to change or see more useful is finding a nice sweet spot where 50 ain't cutting it and would like to bump it up to a happy medium 75% which doesn't exist on any machine I've ever run.

Mine have all been like Myrmidon, feedrate override does the job and it's infinite.

But easy to do this on your computer - just do a mass substitution of G01 F400. (or whatever) for the G00 commands.

I'd save the original separately because it's going to be a lot harder substituting G00's back, if you ever want to ...

There will be some people along shortly to tell you where to change in parameters but ... not my style

 

[yardbird]

You don't say what control but on our Fanuc i series. I believe it's parameter 1420 is the Rapid traverse rate. We have it set a half the max. You could drop the stored values in 1420 by 25% then 100% on the override dial would get you what you're after. No?

Brent

 

[sinha]

You don't say what control but on our Fanuc i series. I believe it's parameter 1420 is the Rapid traverse rate. We have it set a half the max. You could drop the stored values in 1420 by 25% then 100% on the override dial would get you what you're after. No?

Brent

That is correct.
Moreover, 1420 is an axis-type parameter. Can have different values for different axes.

 

[sinha]

Another way can be to modify 1421 instead, and use F0 (0%) setting on the override.
The value stored in 1421 would be the rapid rate, at F0.
1420 would be used for other settings of the override.

 

[Billy_C]

I’ve always wanted to be able to add a 10% on the dial to replace 25%. When easing through a program to prove it out, 5% is just too slow and 25% feels too fast on a fast machine. Sorry don’t have much to contribute as a solution other than the parameter changes above. Outputting high feed moves instead of rapids certainly seems like a reasonable solution for the original post. High speed feed moves are probably easier on the machine because generally everything is slower, maximum speed is what is commanded and rate of acceleration is limited to whatever the mtb has set for the machine characteristics.

 

[TrollTuner]

The Brother Can be changed per position on the knob. My Okuma lathe goes to 200% rapid.. ( doesn't change speeds but makes you feel better at the end of a rush job Haha

 

[ducesrwld]

i've had a few flavors of yasnac, older fanucs, haas, and fadal on the floor all machines being couple decades old the 100% just doesn't get used much these days would rather have something dialed down a bit for that setting. figured there had to be something in the parameters to control this just been on my mind of things to change out on the shop floor. would be nice to have some variable setting as the feed n speed dials for sure.

 

[Vancbiker]

On Fanuc controls as far back as the 16/18 series, Fanuc provided Rapid Override ability in 1% increments. It was the machine builder's choice to use the signals ROV1 and ROV2 for the typical 4 steps of override or the signals HROV0-HROV6 (7bit binary input) to provide override in 1% steps.