Hi There, I use the vectric program, but I have a problem to cut a circle, and the machine does not cut the circle properly and suddenly geos off the track. I usede oak wood with a tickness of 19mm. when running the cut with the openbuild program, at first everything is done well and there are no warnings or errors when running the program, but the mill deviates from its path. It can be a problem of not maching the length of the mill and the thickness of the wood?
Do you have a picture of what happened? Is there anything mechanically loose on the machine. Are any shaft couplers slipping. Are you trying to cut 19mm deep in one pass? That definitely won't work if your cutting length on the tool is not at least 19mm. Plus oak is a very hard wood. Do not cut more that 1/2 the diameter of your endmill for each pass. An example: 6mm endmill diameter should be a 3mm depth of cut.
Almost always mechanical. Check grubscrews on pulleys/shaft couplers as first check Could also be wiring: docs:blackbox:faq-identify-motor-coils [OpenBuilds Documentation] - intermittently losing connection to the motor because of a wiring break or loose terminal getting tugged on just at the moment it looses position
yes I have two pictures about that, first picture is before circle cutting and all of things are OK and secound picture is for after cutting. I don't think that have mechanical problem because before cicle cutting there is no any error. also I used a 1/8 inch mill with 20 times passes and this error has happed in the last pass.
The 3D cuts has a lot less sideways forces than a slotting operation - on the last pass there is quite a bit of rubbing on the bit - it could catch if the mechanics are a little loose. Please do check the grubscrews just to eliminate it as a possible cause. Give the endmill a wiggle and see if it feels like something's loose and moving around on you.
Looks like you were cutting anticlockwise. this means the cutting forces move the bit into the work. If you cut clockwise you get 2 benefits, the bit moves away from the work if there is a problem and the finish on the cut is smoother. Were you using a vacuum hose to remove the chips from the slot? This is essential, recutting the chips makes the bit blunt very quickly, and also increases cutting forces making it appear that you are cutting much deeper than you are. Downcut bits are especially sensitive to chip buildup. Is your bit very sharp? if not, replace it now. They actually have to be replaced much more often than we think!
Note that slotting is hard even for very expensive cast iron framed machines and should be avoided when possible, see the first 3 videos here
