G61.1, feedrates

We just got a 510C installed and I'm having some problems using higher feedrates.

Here what we're doing/using:
-510C with MAZACC-2D (G61.1)
-Matrix control, running EIA programs
-Mastercam X2, pocketing with 2D high speed toolpaths (and sometimes apply high-feed option for roughing)


First off, without G61.1 enabled, the machine will not feed above 315 ipm.

Mastercam's high speed toolpaths will allow the tool to run 300-500 ipm, and slows down for the corners with the high-feed option. Unfortunately, these toolpaths are broken down into short line segments, despite the fact that they are 2D toolpaths.

Of course, G61.1 does not like these high speed toolpaths, but without G61.1 enabled, we can't use the higher feedrates to truly take advantage of the high speed toolpaths.

Is there a means to unclamp the 315 ipm limit, or am I going to be stuck having to purchase MAZACC-3D to take advantage of Mastercam's high speed 2D toolpaths?

Frustrating.

[ 04-09-2007, 12:40 AM: Message edited by: fpworks ]

Just use G61.1 and don't bother with MasterCam's High feed option. If you want to use High speed loops, don't have it output the different feedrates. You can control accel/decel and angular moment in the program.

First off though, you need to figure out the baseline for the machine. Just try programming normally with high feedrates without constantly changing feed for corners. From there you can adjust the machine with a ball-bar to tweak it more. To be honest, Mazak's factory settings are pretty good for most. If you find arc problems at high feeds, you can adjust the decel in the program like this:

G61.1,K40 (with the comma and everything)

The K value determines the "clamp" rate. Default is 70 (although you can change that with a parameter). The lower the value, the higher the clamping (in other words, the more it slows down in corners).

Now, for Mastercam, sounds like you may be running the cut parameters too tight if you're getting real small segments. Not sure of your exact toolpath so it could be a number of things.

M3 is the max feed rate----Check this -----this will let you feed at higher feed rates with out G61.1 active. Depending on your shape 2D/3D with G61.1 on you may never be able to reach these speeds due to Acc/Dec Settings/limits of G61.1