Vcarve letter problems

(Michael Ryan) #1

So, have had the machine for a month, shapeoko xxl doing well,Now Both futura and arial font in carbide create and vcarve desktop do this same thing of mostly missing characters at the ends of lines and the material and the table are level. Is more visible with smaller fonts.

I have tried turning everything off and on without success. tried different gcode files.
I am using a 60 degree 1/2 inch vee bit from freud on all the lettering. Speed is 22000 , feed rate about 50 and plunge about 20.
Help, am kind of stuck here.

(William Adams) #2

The smaller characters have more letters in a given distance which results in more up/down movement.

Most likely you have some sort of mechanical issue, please check:

Also feeds and speeds may be a consideration: and see for a testing technique

(Craig) #3

Verify your material thickness is the same. Depending on where you are zero’ed, can affect the VCarve outcome

(Michael Ryan) #4

I have been a fine woodworker and luthier for a long time and this cnc stuff is a real paradigm shift in work flow, accuracy etc. I really like it but I feel like I am a first year medical student all over again.
All seems to be working now. I guess the material was really uneven. Usually catch stuff like that. In mdf it seems to be working well. I did go through all the tightening procedures and found almost none loose. I also checked the spoil board again with a dial indicator for level and it is.
I hope all is tight and calibrated now.
Thanks for bearing with me, such a newbee. I do love vcarve though.

(Stephen Gullage) #5

Two things can cause this… slipping and material surface not being level/flat.

It’s hard to tell from the pics because it’s apparent that you ran several test runs, so I can’t be sure.

If, for example, the right hand pic was all one carve, then I would say your material was not level to the machine. This is assuming it finished one line before moving on to the next. Either your wasteboard is not leveled properly, the material was thinner on the right than on the left, or the clamping allowed the material to lift on the left side during the carve. It’s interesting thought that the Hebrews 4:12 came out fine while the line above it did not. To test to see if the problem, zero your v-bit on the right side and manually jog it to the left side… does the v-bit point drag into the material as you progress from right to left? If yes, then the surface of the material is not level

If, however, you ran each line as a test, and zero’d the v-bit each time before running the next line, then you have a slipping belt. An easy test to confirm this is to carve a line, then send the bit back to the original zero, and come down 6mm so you’re at what the machine thinks is 0,0,0. If the bit is not zero’d properly to the material, then you know it gained height as it went along… and you need to follow the slippage troubleshooting Will posted.

Edit: I just realized you’d already resolved your issue… one thing I would suggest measure that board to see if it really is thinner on one side than the other. If it is not, and you already checked your wasteboard to ensure it’s level, then your clamping is allowing the material to lift on the left side… those smooth MDF brackets may be the issue. Try gluing some thin strips of high grit (220) sandpaper to the edges to give them some grip.

(mikep) #6

It’s not so much that the surface is level, but that it is perpendicular to the Z axis. If you level all the rails, and level the surface, then it is (ie. if the rails, and the surface are all level, it must be perpendicular) The easiest way to get to perpendicularity is to surface the wasteboard with the router and an appropriate toolpath.

(Michael Ryan) #7

turned out to be the material. now have more problems

(Stephen Gullage) #8

Anything we can help with, or you just mean finding material that’s a uniform thickness? Easy fix for that: level both sides before painting and the subsequent v-carve. In my experience, leveling material before working with it is an essential part of any project. For especially warped material, wedges under the bow or around the edge for cupped material keeps everything solid so you get a clean leveling pass.

(Ronald Waite) #9

I was having same problem, Thank you for the reply WillAdams , it definitely helped me.

(Michael Ryan) #10

Interesting learning to work with such unforgiving tolerances.
Slowly learning.