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Problem with 4th axis engraving

sstephe1622
Advocate

Problem with 4th axis engraving

sstephe1622
Advocate
Advocate

I'm trying to engraving with the beta wrap tool path on and notice that I'm getting some really weird Feeds. I have the feeds set at 2 for plunge and speed as its the first time I've tried this part of the software.

I'm using the Haas a-axis with -a post.  Any idea's  I'd post the FD3 file but am not allowed.

 

Thanks

 

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N1020 X0.3782
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N1070 X0.3799 A30.901 F7324.039

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Replies (3)

Steinwerks
Mentor
Mentor
Accepted solution

What you're seeing is Inverse Time feedrates: https://diy.haascnc.com/reference-docs/inverse-time-and-feed-minute-modes

 

G93 Inverse Time

G93, Inverse Time Mode ON, translates the linear (inches/mm) feedrate into a value that takes rotary motion into account. G93 specifies that all F (feedrate) values are interpreted as strokes per minute. In other words, the time (in seconds) to complete the programmed motion using G93 is 60 (seconds) divided by the F value.

G93 is generally used in 4 and 5-axis work when the program is from a CAM system. When you use G93, the F value tells you how many times per minute the stroke (tool move) can repeat.

When G93 is used, feedrate (F) is mandatory for all interpolated motion blocks. Therefore, each non-rapid motion block must have its own feedrate (F) specification.

Program code G93 to start Inverse-Time mode.

G93 was introduced in Mill software version 9.22.

Neal Stein

New to Fusion 360 CAM? Click here for an introduction to 2D Milling, here for 2D Turning.

Find me on:
Instagram and YouTube
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sstephe1622
Advocate
Advocate

Do you know Fusion side if there is a way I can set a maximum feed value?  The problem I ran into is that once the feed goes over F10000+ the controller can not interpret the value and the program freezes at that point.  I went in and edited the code by hand for any value greater then F9000 but it would be nice to do it software side to help eliminate the hand editing.

 

Other thing I noticed if that for rapid moves it has a feed of F.8XX (Can't off hand remember the last two digits.) So it takes an eternity to go from one side of the part to the other side of the part.

 

Thanks

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Steinwerks
Mentor
Mentor

You might be able to modify the post to limit feedrates, but I'm not sure offhand.

 

Can you share your part or an example part? The rapid feedrate sounds odd. Make sure you have G0 enabled in the post at least.

Neal Stein

New to Fusion 360 CAM? Click here for an introduction to 2D Milling, here for 2D Turning.

Find me on:
Instagram and YouTube
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