BDM wrote:Not that it solves the OP problem, but I was cutting out holes last night with a Onsrud 1/8" bit and the holes kept coming out too small, so I took the advice of the board and used calipers on the bit. The diameter was .113, almost ten percent off of what it was supposed to be!! I couldn't believe it. Entered the actual value in the tool database and the holes were perfect. I might expect that with cheap bits, but I would think that a company like Onsrud would have better QC than that? After that incident, I'm going to go through every bit and measure it and then put the value on the box, so I know if I have to change the value in the program.
It may have been a 3mm end mill which is .118.
I find it quite rare that a manufactured end mill from a reputable manufacturer like Onsrud to be that far out of tolerance. Heck, I would be shocked if it was .001 out of tolerance.
Imagine the Possibilities of a Creative mind, combined with the functionality of CNC
Bill I wrote:I have looked in the v-carve folder I do not see a CRV file I will gladly post the file If I can find it.
Where do I find the CRV file?
The bit measures .375 I used the same bit to cut both the the V-Carve file and the Enroute file.
The CRV file is the actual file you've loaded/saved into VCarve for the project so it's wherever you saved it.
If it's the same bit then it's almost certain that it's not defined properly in the tool database or in the toolpath if you've edited the tool. Go into the toolpath. Click on Edit... in the Tool section and check the diameter value there.
I was wrong about the diameter. That said, can you change the cut direction to conventional and see if the size changes? You don't say or show what machine you have so, can you give that a try and let us know what you machine is? over 300 ipm may be too fast for it
Gary Campbell
GCnC Control
ATC & Servo Controller Controller Upgrades
GCnC411 (at) gmail.com
I was wrong about the diameter. That said, can you change the cut direction to conventional and see if the size changes? You don't say or show what machine you have so, can you give that a try and let us know what you machine is? over 300 ipm may be too fast for it
He also has a Pass Depth set at 0.5". Perhaps the Feed combined with the Pass Depth is too much for his particular machine and causing the inaccuracy?
I have a custom built CNC 640 oz motors with 2-1 reduction with gecko vampire drivers the rest is PMDX .
Have been running this machine for over a year with no problems at the feed rate.
Bill I wrote:
I ask a friend who uses Enroute to draw the same pocket and send me the file and it cut perfectly.
This is very puzzling. The pocket and the perimeter are just vectors is all. It doesn't make any difference what program the vectors are drawn with as far as actual machining is concerned - as long as they are the same size shapes!
Bill I wrote:I have looked in the v-carve folder I do not see a CRV file I will gladly post the file If I can find it.
Where do I find the CRV file?
The bit measures .375 I used the same bit to cut both the the V-Carve file and the Enroute file.
What your saying, is in an older version of VCP it worked fine and with the gcode generated in another program it was fine? Correct. So its not the bit diameter. It could be flex in the machine.
I have been using Vectric for code on a few different CNC machines and I have upgraded from V-Carve thru several versions and then to Aspire and again through several versions, without any issues.
I agree with Gary - over 300 IPM does sound quite fast. But you say that you have been doing that for a long time without issue. Your machine must be very stout and rigid.
Like Michael said - I also don't see anything wrong in the CRV file, but I agree, I am reluctant to find V-Carve Pro to be faulty, only because of past experience.
Imagine the Possibilities of a Creative mind, combined with the functionality of CNC
I will attach the G-Code file done in Enroute The file was cut at the same feed rate as my file.
I have cut entire kitchens at 300 ipm with no problem the program I use for cabinets is cabinet making software
Bill, I see the 300IPM feedrate in the programs and I do believe you.
Without standing in front of your machine, I am also at a loss to understand what is wrong. Everything seems to be correct, at least from what can be seen from here. There IS something wrong, but I just cannot see it. I have never seen Vectric fail in this way, but maybe Vectric support can help. Perhaps you should send your CRV file in to them - maybe they will see something that we do not see.
Sorry we don't see this
Imagine the Possibilities of a Creative mind, combined with the functionality of CNC
