I eventually replaced the BOB and upgraded to Mach3 - that solved the irregularity problem.ĭon't give up - the grand kiddies can have their stuff - but they must wait for it. I did the same sort of testing on my machine.
I had another similar problem where my "Z" axis was irregular. Martin is right about your testing not proving that the machine is OK. I do plan on a much larger stepper motor.
I had to add a counterweight to my machine. My spindle is 15 pounds and the stepper would fail to overcome the inertia of the "Z" changing direction. I have since tried a job that required a lot of ‘Z’ movement, which failed the first few times, but worked perfect after adding the spring. The most recent fix was adding a heavy spring. Once the motor got some wear, the heavy spindle would lower more than the stepper motor would hold. I had to retrofit because it would not fit where the original went, but that solved the problem, for a while. I then changed the stepper motor to an oversize, two-phase, high torque thinking my 6 HP spindle (that weights the size of my car engine) was just too heavy for the stepper motor to hold it up. I tried everything including changing the UBS board and the stepper motor, but still had the problem. Although I agree, when milling, if I hit a spot that causes a bind or hit something like the hold down, it will lose steps and cause it to go out of calibration, however that is rare. Garylmast wrote:I’ve been fighting the problem of losing ‘Z’ height ever since I bought my machine. If your Z axis looks anything like the one below (found it searching for Data Cut) I would check the set screws to ensure they are tight and do they have a flat spot on the shafts to prevent slippage. They felt tight however when I cut an intense Vcarve project (lady in the woods) I would loose steps. I had the very same issue you are seeing with my Joe's 4X4 and the problem was loose couplings. I'm amusing Data cut CNC based on your profile. What CNC are you running and controller software. What control software are you running? Have you tried reducing the z axis acceleration & velocity? If you are using micro stepping what have you got it set at? Go back to the very start & look at everything again, check for backlash, any tightness, loose couplings etc etc. Photo carving where you have a lot of rapid z moves will show up problems that other forms of machining may not. Martin54 wrote:Like Adrian has said your test doesn't prove that it's not a machine issue at all. If anybody out there have experienced a similar problem and can kindly share the secret to the solution, I shall be extremely grateful. I cannot say how frustrated and disappointed I am, as I am sure that I'm not the only grandfather who wants to do photos of the grandchildren. I have even, as suggested, tried to run it as slow as 25% speed to prevent the loss of steps etc, etc. Yet, when the cutting of the Photocarve program has to be done, this gradual and ever increasing loss of depth occurs. To prove that there is no structural or any other defect with the machine, I have actually proceeded to cut (in "jog" mode) a frame or square on 0.02 mm depth all the way around the picture and it is perfect. The material is also 100% flat MDF product. However, as the program progresses, say for example as from about command (coordinate) around 10 000 onwards, it increasingly looses depth until it does not even touch the surface where it is supposed to be cutting about 1.200 mm deep. 1 mm, it does not even touch the surface! That being the case even although I have started cutting at the start of the program at the correct depth - that is 1 mm on the display=1 mm actually being cut. However, my machine is still losing the actual -Z values as reflected on my display and read-out of the depths to be cut.in other words, although, according to the tool path, the machine should be cutting at say eg.
As I think a lot of improvement happened when doing normal V Carving and Engraving, I was very hopefull that all problems have been sorted out. I have since tried everything they mentioned, and due to the nature of the proposed remedies such as upgrading and improving the "insides" (I think it is the memory? anyway it is two pieces of micro circuitry the guy replaced) of my computer, it took some time to get around trying my luck with a Photo V Carve project again. Hi All, I have raised this topic maybe more than a year ago and received some advice from a few.
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