Brett, Thanks for that I had to have a look to see what G64 (CV was) and I will try this to night, the program I'm using is MC9, you might have noticed that the file is a 3D shape and Mach3 originally didn't like changing from G17 (x-y cutting plane ) to a G18 (X-Z cutting plane) it kept claiming the start of arc is different to end of arc in previous line, even when I-J incremental mode was changed. (if you want the DXF or MC9 file I will post)
So I re-drew the shape and made it a spline instead of a chain. then re-analysed the tool path and this is the result. (note: the mold that the sunnies sit on thru which I suck the vacuum was cut using the same point to point style of programming [cutter was 3/8" ball mill with 8% overlap at 4600mm/min ] the only difference between then and now is that I have changes spindles from a Ryobi 2Hp router to a VFD 1.4Kw high speed spindle - I wonder if the spindle frequency is interferring with the steppers??)
Graham I did notice that cutting at 4600mm/min took 1M43S to cut and at 2600mm/min only took 3Sec -- so to get this clear in my own head (this could take a while
) ....is you theory that the router won't try to accelerate to full speed at the same time as it's trying to slow down??
ONE OTHER POINT OF NOTE... Last night I tried to get a video of the cutter in action, but for me to set up and start filming I reduced the speed using the FEED RATE OVERRIDE and upon dropping the speed to 20% of 4600mm/min, it did as advertised --cut slower.. but it also kept the chunky action at the end on each line or direction change... (that sudden start stop).
I wonder if its worth trying to reduce the acceleration and/or max speed to ensure a softer start and more constant run speed...... but then wont Brett's G64 do the same thing, Find out the answer to these and other intriguing questions in next weeks exciting episode of the day in the life of a Dayton Owner VTIC
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