[Adverse Effects]

no i am useing a 240VAC pond pump that is a bit bigger than a baseball

[MarcusWolschon]

Sorry, can't help you remotely.
Do you have an oscilloscope to look at the signals when it's happening?
G540 is still an ancient parallel port... Maybe timing on the PC?

[Adverse Effects]

no electronics is way past my abilitys

i can build a car but ask me to wire it up and i'll just look at you with a blank look LOL

[handlewanker]

Hi, that's a mighty fine bit of orchestration you have there in the first vid....I definitely heard the guy drop the cymbal at the end when you were conducting the "music"....LOL.

That little clonk you pointed to sounds like a bit of damage to the screw when it partially seizes and you lose a step or two as it grabs.

It sounds like it might be the screw because it happens in the same spot.

The only other possibility is one of the X axis linear rails having a bad spot from wear or thin surface hardening, but hardly likely to cause a missed step.

It is possible, as in all ball type bearings, to have a ball dent from impact abrasion and this will get worse every time the ball contacts it.

Can you slacken off the screws holding the linear rails to the gantry sides and rotate the rails to see if there is any damage on the blind side?

If there is some indentation on the surface you can turn the rail slightly to allow the balls in the bearing blocks to run on a new surface of the rail......hopefully the balls are not damaged too........but they would give a cyclic bump at regular intervals if so.

You can test the X axis screw by using a dial indicator to run the Z saddle from start to end and back again to see if you miss steps.

You'll need a jewellers 10 X loupe or magnifier to examine the screw where you pointed to for damage.
Ian.

[Adverse Effects]

Hi, that's a mighty fine bit of orchestration you have there in the first vid....I definitely heard the guy drop the cymbal at the end when you were conducting the "music"....LOL.

That little clonk you pointed to sounds like a bit of damage to the screw when it partially seizes and you lose a step or two as it grabs.

It sounds like it might be the screw because it happens in the same spot.

The only other possibility is one of the X axis linear rails having a bad spot from wear or thin surface hardening, but hardly likely to cause a missed step.

It is possible, as in all ball type bearings, to have a ball dent from impact abrasion and this will get worse every time the ball contacts it.

ok it randomly happens on ether the X OR the Y axis and its in a different place with different files i run and if i set the home point in the center of the table (way away form where its making the noise in that vid) it will still make the same noise in the same spot of the CNC file but be in a totally different place on the Mill

Can you slacken off the screws holding the linear rails to the gantry sides and rotate the rails to see if there is any damage on the blind side?

If there is some indentation on the surface you can turn the rail slightly to allow the balls in the bearing blocks to run on a new surface of the rail......hopefully the balls are not damaged too........but they would give a cyclic bump at regular intervals if so.

You can test the X axis screw by using a dial indicator to run the Z saddle from start to end and back again to see if you miss steps.

You'll need a jewellers 10 X loupe or magnifier to examine the screw where you pointed to for damage.
Ian.

as i said above it can happen on ether X or Y and and it dont matter where on the table it is so it carnt be the ball screws and if you notice in the 3rd vid that uses ALL of the table it dont do it at all

look at the first 2 vids the noise is in slightly different places in the 2 files (both the same file just changed the G61 and G64) also it dose the same cut path 4 times and strangly on the 4th time around (on both vids) it dont make the noise

if you want i will do the same file in 4 different places on the table and you will see that is moves with it

[handlewanker]

Hi, yes I understand......it appears not to be a mechanical fault, but something is triggering it off if it appears at the same time in the program but at different locations.

As you don't get the problem when jogging the move and it's not completely random, it appears to be in the coding sequence in the program, so it will move with it if you change locations around the table.

You would have to find the exact point in the code sequence where the "bump" occurs.
Ian.

[Adverse Effects]

ok same file on a diffrent place on the table (moved it to the middle)

the prevous vids it was on the X axis on thes 2 its happening on the Y axis

did it 2 times first at 1000mm p/m and the 2nd at 2000mm p/m feed rates

even tho its the same file you may notice that "bump" is in a different place on the circle the 1st lot of vids i posted it was at about "7 oclock" this time its at about "3 oclock"

[Adverse Effects]

2nd vid

[Adverse Effects]

here is the G-Code

__________________________________________________ __

%
(Generated by PhlatscripT {trunk} TRUEPLUNGE3.2 by swarfer)
(File: 3D-rockstok-printer-End Effector-02.skp)
(Bit diameter: 3.0mm)
(Feed rate: 1000.0mm/min)
(Plunge Feed rate: 2540.0mm/min)
(Material Thickness: 20.0mm)
(Material length: 380.0mm X width: 550.0mm)
(Overhead Gantry: true)
(Retract feed rate NOT limited to plunge feed rate)
(Multipass enabled, Depth = 1.0mm)
(Optimization is ON)
(Welcome to Phlatboyz, LLC - Unleash Your Creativity!)
G90 G21 G49
M3 S15000
G0 Z10.000
(Pass: 1)
X32.239 Y24.890
G1 Z-1.000 F2540
X35.814 Y21.315 F1000
X39.955 Y18.416
X44.536 Y16.279
X49.419 Y14.971
X54.455 Y14.530
X59.490 Y14.971
X64.373 Y16.279
X68.955 Y18.416
X73.095 Y21.315
X76.670 Y24.890
X79.569 Y29.030
X81.706 Y33.612
X83.014 Y38.495
X83.455 Y43.530
X83.014 Y48.566
X81.706 Y53.449 (----about here----)
X79.569 Y58.030
X76.670 Y62.171
X73.095 Y65.746
X68.955 Y68.645
X64.373 Y70.782
X59.490 Y72.090
X54.455 Y72.530
X49.419 Y72.090
X44.536 Y70.782
X39.955 Y68.645
X35.814 Y65.746
X32.239 Y62.171
X29.340 Y58.030
X27.203 Y53.449
X25.895 Y48.566
X25.455 Y43.530
X25.895 Y38.495
X27.203 Y33.612
X29.340 Y29.030
X32.239 Y24.890
(Pass: 2)
Z-2.000 F2540
X35.814 Y21.315 F1000
X39.955 Y18.416
X44.536 Y16.279
X49.419 Y14.971
X54.455 Y14.530
X59.490 Y14.971
X64.373 Y16.279
X68.955 Y18.416
X73.095 Y21.315
X76.670 Y24.890
X79.569 Y29.030
X81.706 Y33.612
X83.014 Y38.495
X83.455 Y43.530
X83.014 Y48.566
X81.706 Y53.449 (----about here----)
X79.569 Y58.030
X76.670 Y62.171
X73.095 Y65.746
X68.955 Y68.645
X64.373 Y70.782
X59.490 Y72.090
X54.455 Y72.530
X49.419 Y72.090
X44.536 Y70.782
X39.955 Y68.645
X35.814 Y65.746
X32.239 Y62.171
X29.340 Y58.030
X27.203 Y53.449
X25.895 Y48.566
X25.455 Y43.530
X25.895 Y38.495
X27.203 Y33.612
X29.340 Y29.030
X32.239 Y24.890
(Pass: 3)
Z-3.000 F2540
X35.814 Y21.315 F1000
X39.955 Y18.416
X44.536 Y16.279
X49.419 Y14.971
X54.455 Y14.530
X59.490 Y14.971
X64.373 Y16.279
X68.955 Y18.416
X73.095 Y21.315
X76.670 Y24.890
X79.569 Y29.030
X81.706 Y33.612
X83.014 Y38.495
X83.455 Y43.530
X83.014 Y48.566
X81.706 Y53.449 (----about here----)
X79.569 Y58.030
X76.670 Y62.171
X73.095 Y65.746
X68.955 Y68.645
X64.373 Y70.782
X59.490 Y72.090
X54.455 Y72.530
X49.419 Y72.090
X44.536 Y70.782
X39.955 Y68.645
X35.814 Y65.746
X32.239 Y62.171
X29.340 Y58.030
X27.203 Y53.449
X25.895 Y48.566
X25.455 Y43.530
X25.895 Y38.495
X27.203 Y33.612
X29.340 Y29.030
X32.239 Y24.890
(Pass: 4)
Z-4.000 F2540
X35.814 Y21.315 F1000
X39.955 Y18.416
X44.536 Y16.279
X49.419 Y14.971
X54.455 Y14.530
X59.490 Y14.971
X64.373 Y16.279
X68.955 Y18.416
X73.095 Y21.315
X76.670 Y24.890
X79.569 Y29.030
X81.706 Y33.612
X83.014 Y38.495
X83.455 Y43.530
X83.014 Y48.566
X81.706 Y53.449 (----about here----)
X79.569 Y58.030
X76.670 Y62.171
X73.095 Y65.746
X68.955 Y68.645
X64.373 Y70.782
X59.490 Y72.090
X54.455 Y72.530
X49.419 Y72.090
X44.536 Y70.782
X39.955 Y68.645
X35.814 Y65.746
X32.239 Y62.171
X29.340 Y58.030
X27.203 Y53.449
X25.895 Y48.566
X25.455 Y43.530
X25.895 Y38.495
X27.203 Y33.612
X29.340 Y29.030
X32.239 Y24.890
G0 Z10.000
G0 X0 Y0 (home)
M05
M30
%


__________________________________________________ __

[tgdavies]

Can you identify where in the gcode the problem happens? Perhaps run only the first half, then add/remove fractions until you identify where it occurs.

Incidentally, why the very fast Z feed?

I'll run that gcode on my 6040+G540+ESS and see if anything happens.

A look at your Mach3 motor tuning settings might be relevant too.

Tom

[RussellK]

What's your PC setup? My "clonking" problems all derived from my PC being unable to deliver a continuous stream of signals.

[MarcusWolschon]

Please keep your postings shorter, would you?

[Adverse Effects]

Can you identify where in the gcode the problem happens? Perhaps run only the first half, then add/remove fractions until you identify where it occurs.

look back up at ta the post / cnc file i have edited it way down and shortend it and also marked where about where i am seeing the problem

Incidentally, why the very fast Z feed?

i have limited it ti 1000mm p/m in motor turning in mach3

I'll run that gcode on my 6040+G540+ESS and see if anything happens.

A look at your Mach3 motor tuning settings might be relevant too.

Tom

thanks for trying that file for me

as for the motor settings i have played with all of them up and down from speeds of 30mm to 3750mm (max) and accelerations from 15(min) to 500(max) and nothing makes a diffrence

i have some files i can run flat out and dont have this problem with them so its beyond me

What's your PC setup? My "clonking" problems all derived from my PC being unable to deliver a continuous stream of signals.

3.2Gh P4 quad core the CPU never gets above 10% usage and only useing about 200Mb of ram out of the 2Gb in it running a clean install of XP and nothing else installed on it not even the network card driver

Please keep your postings shorter, would you?

sorry i have edited it and cut it to about 1/20th the size

[MarcusWolschon]

If the CPU goes into any of it's sleep modes due to low load, this messes up any software generated timing.
(that's why I think of a parallel port as a bad idea)

[Adverse Effects]

If the CPU goes into any of it's sleep modes due to low load, this messes up any software generated timing.
(that's why I think of a parallel port as a bad idea)

i just looked at what power mode XP was in and its all turned to max performance and no sleep mode

good try tho as i was reading it i was thinking that could be it

[RussellK]

One quick way to rule out your PC being the problem is to try downgrading it from ACPI PC to Standard PC - you do it through Device Manager by updating the driver for ACPI PC then choosing to select your own driver where it will offer Standard PC as an option.

You can change back to ACPI PC afterwards using the same procedure.

[aarggh]

And just to rule something else out, do you have anti-virus installed? If so, disable it during testing.

cheers, Ian

[handlewanker]

Hi, I expect you've gone down the path of jiggling the cables to see if you have a problem there....and the plug in connectors too.

With this program, you are using the X & Y functions and the relative steppers only........is there a difference if you add a Z function during the program, to really put the power supply under load.

Next step, if all else fails, is to substitute the steppers from X to Y and Z if all are the same type, and see if there's any difference.

When you get that AHH HAA moment we'll all breathe again....LOL.
Ian.

[Adverse Effects]

One quick way to rule out your PC being the problem is to try downgrading it from ACPI PC to Standard PC - you do it through Device Manager by updating the driver for ACPI PC then choosing to select your own driver where it will offer Standard PC as an option.

You can change back to ACPI PC afterwards using the same procedure.

ok i'll give that a go tomorrow as i am in to much pain for now (i have ex motor mechanic back and knees)

And just to rule something else out, do you have anti-virus installed? If so, disable it during testing.

cheers, Ian

no as the only connection that computer has to the outside world is a USB stick and that stick never go's anywhere other than this computer i am on at the moment and it dose have antivires

Hi, I expect you've gone down the path of jiggling the cables to see if you have a problem there....and the plug in connectors too.

With this program, you are using the X & Y functions and the relative steppers only........is there a difference if you add a Z function during the program, to really put the power supply under load.

Next step, if all else fails, is to substitute the steppers from X to Y and Z if all are the same type, and see if there's any difference.

When you get that AHH HAA moment we'll all breathe again....LOL.
Ian.

i'll give swapping the motors a go tomorrow after i try the other things

i am praying for one of thos AHH HAA moments because i have so meny things i want to cut at the moment

the part i dont get is it was not doing it for about 6 months after i replaces the YOOCNC controller and all the cables

[MarcusWolschon]

Using the original cables?
Check their resistance when bending!
Maybe one broke and thus it only happens when it is bent in a specific way.