(built-in) High Feed rate ??

[latestconceptsinc]

Thanks in advance for any help,

I am running HSMexpress and using the Haas generic Post, i dont know what to enter in the field for (BUILT-IN) HIGH FEEDRATE.

   Would i enter my machines max rapid ipm? or ?

 if i enter 300, my Haas VF2 codes out.

 when i enter up to 150 it seems ok ...

 what is (built-in) high feed rate?

 again thanks for your help

[Steinwerks]

Many machines rapid at higher rates than a G1 feedrate can be programmed, so you would enter the maximum non-rapid feedrate (G1, G2 etc.) that the machine will accept.

Edit: I should add that this WILL NOT limit a programmed feedrate in a toolpath. I had the Fadal try and take off at 833 IPM the other day. Without error, even. Was a bit of a surprise.

[latestconceptsinc]

On the front of my machine is claims 710 IPM.

 are you saying its asking for the max cutting feed rate(G0) or max rapid (G01) in the Post (built-in) high feed rate field?

i am sorry if this doesnt make sense, i am very new to all this.....

[Steinwerks]

G0 (or G00 in the extended proper term) is rapid. G1 (G01) is commanded feed (but so are G02, G03, all with an F value).

What is your machine?

[latestconceptsinc]

Its an antique...

  1997 Haas VFOE.

[al.whatmough]

we should first answer what this parameter does.

It will do two things.

1. It will cause an error if you attempt to post a program that has feedrates that exceed this value
2. It defines the feedrate when Rapid moves need to be converted to Highfeed moves
   1. this happens for dog-legged rapids.

[Laurens-3DTechDraw]

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@al.whatmough wrote:

we should first answer what this parameter does.

It will do two things.

1. It will cause an error if you attempt to post a program that has feedrates that exceed this value
2. It defines the feedrate when Rapid moves need to be converted to Highfeed moves
   1. this happens for dog-legged rapids.

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Al,

I hate to do this but this is not totally the case.

1. Posts will not error out when the programmed feedrate is higher than the highFeedrate property.(Just tested this to be sure, this can easily be made of course.)
2. Yes, in some posts possible "dogleg" moves are posted out in highfeed, but for fanuc posts for example this is not the case and those machine do dogleg when you are not in contour control mode.
3. It is always outputted if you choose this in the linking tab of your operation.(There is a drop down that usually says "preserve rapid movement", but you can choose for "always use high feed")

[al.whatmough]

right you are, I certainly had a brain fart on that one.

[Laurens-3DTechDraw]

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@al.whatmough wrote:

right you are, I certainly had a brain fart on that one.

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NP, luckily we can always help each other here on the forum. 

[Steinwerks]

Watching a 1997 Fadal try and move at 833 IPM is... a little unnerving. Especially when the high feedrate is entered as 200 

[latestconceptsinc]

Well..

 I have been testing this and correct me if i am wrong please.

 My machine's Max feed rate is 300". I made a few small programs at the machine and it will defintly rapid at 300" ( holy crap the whole machine shakes ) but that proves my machine actualy could read that feed rate and not Alarm.

When posting i should be able to enter 300 as the "(Built-in) High Feed Rate" in that field?? right?

 

i am not sure why but when i do, every program that gets posted with a "(Built-in) High Feed Rate" above 150 triggers an alarm.

 Am i not seeing the obvious here???

  thanks

[Laurens-3DTechDraw]

What is that alarm?

But apart from that, I think you focus on something that doesn't really matter.

The high feed is never used if you don't choose for it specifically and there are nearly no reasons to choose it.

I have it set to 0 for our milling machines.

[latestconceptsinc]

Laurens

 It is a 309 (exceeded feed rate ) alarm.

"The high feed is never used if you don't choose for it specifically and there are nearly no reasons to choose it."

 How would i not choose for it? i mean if i set that data field to 0 will it rapid @ the last feed rate enetered?

[Laurens-3DTechDraw · Accepted solution]

Oh you want the post to make sure there are no doglegs?

In that case you need it indeed.

[scottmoyse]

I haven't seen this value have an effect yet. I always just use the settings on the linking tab. I suppose you have to select the override as well as specify the speed to get it to work.

I think I'd just prefer to have more granula control and so do it in each op instead.

[Steinwerks]

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@scottmoyse wrote:
I haven't seen this value have an effect yet. I always just use the settings on the linking tab. I suppose you have to select the override as well as specify the speed to get it to work.

I think I'd just prefer to have more granula control and so do it in each op instead.

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If the post outputs high feed motion and no rapids (looking at you generic Fadal pp!) it will use the high feedrate number between operations.

[Stu.r.holmes]

I also had trouble with with (built in) High Feed rate. Here is how to not use it anyways........

If you don't want to use it simply enable the G0 line in the post window (I prefer to have control over the rapid speed at the controller rather than have than a pre programmed speed that you can't slow down with out effecting the cutting speed of the operation). I'm in a prototype shop so always nice to control the speed of the movements around clamps etc on one offs or setups.