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problem with accuracy V carvepro

2408 Views 11 Replies 6 Participants Last post by  BalloonEngineer
Hi folks new guy here, looking forward to sharing and learning new things, that being said can anyone help me with a problem I am having with my CNC?

all of a sudden the accuracy on my machine went whacky, I went through my machine and everything seems to be tight, so I am thinking its sofware I have Vcarepro I did a test cut on 3/4 mdf I did a 3" hole and a 3 plug and it came out a little over an 1/8" sloppy. both the hole and the plug were spot on as far as square edges and roundness goes, just too small?? any help woul be greatly appreciated

Mike
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Did you doublecheck that the measured bit diameter matches what was specified in VCarve? Using a 3/16 bit when you specified 1/4 could cause this, for instance.

Also, in VCarve, you have choice of cutting inside, outside, or along a vector. You need to choose the appropriate one.
yes thats the first thing I checked, I just did a second test and the results are the same, I thought maybe I had the ''offset'' box checked but that was not it
Can you give us a little more info about your machine and controller software?

If you install a v-bit and line it up with an accurate ruler and then, via your mdi command a move (I.e. g1 x12.0). Does the axis move the correct distance? If not, it is your “steps per inch” (or mm) setting that is probably off for that axis.
Inside for hole and outside for the plug? Just to double check. ;)
It is a 4X4 cnc from cncrouterparts I bought as a kit and put togrther myself nema 23 motors rack and pinion drive software is Vcarve pro, had it about 5 years never had a problem

till now been an awesome machine I will try what you say in the morning, how do I chang steps per inch? thanks guys

and joe yes it was inside for hole and outside for plug with a 1/4 end mill
Welcome to the forum, Mike! I don't use VCarve Pro but are there any offsets applied to the cuts? If so, that would throw off the actual cut from the dimension as given in the software.

David
Hi David,there are no offset's set on the program I am going to try what Richard suggested about the steps per inch and see if that's it
One more thing, make sure you are using the right post processor when you save your gcode files.
accuracy problem

Hi guys, I found my problem, it was in the mach 3 software

under motor tuning, the two tabs there were set at 2

but they should have been set at 0. I reset them and retested

and the part came out perfect. But the question remains as to

how they could have changed from 0 to 2? I remember a short while back

I had to do a force shut down could that have caused this?

anyway I am back in business and thanks to all those who tried to help!!:smile:
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Welcome to the forum Mike.
Hi guys, I found my problem, it was in the mach 3 software

under motor tuning, the two tabs there were set at 2

but they should have been set at 0. I reset them and retested

and the part came out perfect.
What settings were off? Normally all of the settings do get saved during a normal exit from Mach, so any abnormal shutdown could have corrupted the settings file.
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