computed run time vs machine actual

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computed run time vs machine actual

Postby captstrato » Mon Mar 18, 2019 10:20 pm

When I program in Vcarve, i usually check to see what the run time for certain programs will be. Without fail, the Shark takes twice as long if not longer. I also notice I get lots of chatter at feed rates of 150 ipm or more. Are the stepper motors too slow to keep up the program being fed to the machine? Any suggestions as to how to check the machine via timing?
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Re: computed run time vs machine actual

Postby bill z » Tue Mar 19, 2019 7:42 am

V Carve was written for many more machines that the sharks. It is what Next Wave selected as one of the CAD CAM software that works.

When V Carve gives the time estimate for carve, you haven't selected a post processor. Note they call it estimate.

Check this out, look at the estimated time, then change the post processor and see if the estimated time changes. It does not change on my version of V Carve (an older version).

If you notice that consistently your carvings are twice that of what the estimate is, then note to self, double the estimate.

Just enjoy what the machines can do for you.

Hope this helps.
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bill z
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Re: computed run time vs machine actual

Postby Kayvon » Tue Mar 19, 2019 10:22 am

If you notice the estimate is off (and it is--this isn't uncommon), you can change the scale to get more accurate estimates in the future. The "Toolpaths Summary" display has a portion at the bottom that says "Time estimates based on ..." where you can adjust the scale for more accurate estimates.
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Re: computed run time vs machine actual

Postby Scheffy » Wed Mar 20, 2019 11:26 am

Vectric has a little blurb about this in their online manual:

Basically if the actual machining time is consistently twice what it estimates now, just double that scale factor. Might be worth double checking that the rapid rate you typically use is what's called out on the estimate window.
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