[nlancaster]

keling KL4030, I tried full step and 1/2 step same issues. http://www.kelinginc.net/KL-4030.pdf

[ger21]

Try 1/8 or even 1/16. It should be smoother at those settings.

[louieatienza]

turning off sherline mode doesnt seem to have effected the lost steps.

But now another problem I have been fighting, I thought I had it solved but now that I am cutting things it has reared its head big time.

the Y-axis shakes. No matter what speeds or angle of cut it shakes while moving. I have tried everything from super tight on the bearing adjustment block, to barely holding it on and it shakes. Any help would be appriciated. edit: This is the long axis I have setup as my y.

Would this help for the issue I am having?

http://www.cnczone.com/forums/diy_cn...ock_solid.html

The screw could be bent, or the leadnut or one or both bearing blocks are not in the right position and needs adjusting...

[nlancaster]

I will try the 1/8 and 1/16 microstepping. But I am not confident that is the issue. The shaking seems much more pronounced on the adjustable bearing block side of the gantry.

[nlancaster]

Gantry moving knot cable system really helped.

But I am still getting some vibration when the gantry moves causing chatter marks on the cut. You can hear the machine rumbling when it moves. Happens at any speed it operates. This only happens on the long axis of the machine. Please help.

[ger21]

Reading the other thread just know... Perhaps your bearings are too tight?
One of the limitations of these "pipe" designs is that there's a very fine line between not tight enough and too tight. I'd try loosening the tension a little.

On my machine, there's about an 8" section that shows "chatter" marks when doing profile cuts along the X axis. I can feel it, and I'm fairly sure it's an issue with the bearings, but I don't really think it's fixable.
The fact that you have a single leadscrew probably makes it much worse.

[nlancaster]

I have tried tight, and everything to so loose some of the bears are completely free spinning. I will keep fiddling with it.

[nlancaster]

I am going to see if maybe I have a bad stepper, swap the x/y steppers, also try 1/8 and 1/16 stepping, as I am currently at 1/2 on both axis.

[nlancaster]

Well I can now get good cuts at 50ipm. So I am doing a rough cut leaving .03 or .05 at 120ipm, then come back for a finish cut at 50ipm. nearly glass smooth.

[ger21]

Did you find out what the issue is?
I just thought of something. Is your leadscrew whipping at the higher speeds? Mine does, and I think that's what may be causing the similar issue that I have.

[nlancaster]

I don't think the lead screw is whipping. I have a dumperster coupler at one end and a dumpster clamp at the other end, and I have varied the tension on the screw and it also isn't visibly whipping. The rumbling/shaking problem also happens no matter where on the table the gantry is. Close or far it rumbles and shakes at speed.

Goal with the machine now is:

1. Get my dust collection system up and running.
2. Make enough money to by a CNC Routerparts 4x4 machine.
3. .....
4. Profit!

[nlancaster]

Still having problems with random limit switch hits. How can I track down what is going on? They all are solidly fixed with screw on terminals. The system is outputting 5volts to them checked with a multimeter at one of the switches.

The limit switch issue cause a problem with the sign I cut below in red. The blue one was the first one I cut and it has issues with the shaking gantry, the red one cut much better but a random limit switch trip caused the program when restarted to skip the roughing pass for the outer profile cut and go straight to the finishing cut. resulting in a few chatter issues mostly at the corners. But you can see on the vertical side cuts the before and after, the blue is cut when it was shaking, the red was cut after figuring out how to minimize the effect on cuts.

[ger21]

If noise is triggering the switches, then it can be very difficult to track down. The simplest fix is to just increase the debounce by a good margin.

Personally, I'd just disable them. Crashing into a hard stop shouldn't cause any damage, and you can use softlimits to prevent crashes. Just use the switches as Home switches only.

[nlancaster]

That is something else I have had a little trouble setting up. How exactly does one setup the soft limits?

[nlancaster]

Also it appears to matter what microstepping I set I get shaking in the y-axis. even at 1/16th. I don't think its the bearings as the problem only happes above about 60ipm. The screw is pulled tight with dumpster clamp at one end and a collar at the other end. Please help. Gerry has suggested several things, but help from anyone else would be apprciated.

Right now at 100ipm the cuts are jagged only in the y-axis direction, the long axis. If I slow down to 60ipm they are fine.

[nlancaster]

Here is the prototype for my dust shoe! It works very well, basically no dust left behind. Inspired by designs found here.

The most inspiration for my dustshoe came from Senna and his wonder full router thread.

http://www.cnczone.com/forums/diy_cn...tml#post850146

Going to make another out of acrylic and be able to see at least a little of what is going on inside dustshoe.

[atwooddon]

Also it appears to matter what microstepping I set I get shaking in the y-axis. even at 1/16th. I don't think its the bearings as the problem only happes above about 60ipm. The screw is pulled tight with dumpster clamp at one end and a collar at the other end. Please help. Gerry has suggested several things, but help from anyone else would be apprciated.

Right now at 100ipm the cuts are jagged only in the y-axis direction, the long axis. If I slow down to 60ipm they are fine.

I thought I had replied to your post previously, but I guess I didn't. Is it possible you are running into some 'resonance' issues above 60IPM? There are several threads here on CNCZone about stepper resonance and the use of 'dampers' to help eliminate the problem.

Don

[nlancaster]

I built a damper and placed it on my motors and it made no difference. Still need to build 2 more to put it on all motors just to be sure.

[nlancaster]

Cutting some aluminum.

Just a little test piece.



Just need to get a piece of acrylic to cut and make it fit flush to the outside of the case.

[nlancaster]

Tomarrow I have an interview for a entry lvl CNC operator job.

Think this might help me get that job?