Profile Circle on 3040

[Clive S]

How am i not helping myself.

Because you are not actually giving any good info ie. (it was set to 2000 but reducing it to 1500 improved the circle. ) does not mean anything with the parameters that go with it.

Also you said that you ran his code!! which code Doddy's is the only code I see in this thread and that has a square and circle.

If you want help you have be more specific with the questions as the crystal ball is broken.

[dfox1787]

Because you are not actually giving any good info ie. (it was set to 2000 but reducing it to 1500 improved the circle. ) does not mean anything with the parameters that go with it.

Also you said that you ran his code!! which code Doddy's is the only code I see in this thread and that has a square and circle.

If you want help you have be more specific with the questions as the crystal ball is broken.

im not sure what info i can give.

I'm pretty new to cnc and i posted on here for help not criticism.

i did say the acceleration was 2000 but now i set it to 1500 which has improved it. What i meant was i changed velocity.

[Clive S]

I'm pretty new to cnc and i posted on here for help not criticism.

I am sorry you feel like that but I suggest you re read this thread from the beginning and look back at your answers carefully and you will see that you have not given any clear reports back.

Did you run Doddy's code !! if so what is the result?

[dfox1787]

I am sorry you feel like that but I suggest you re read this thread from the beginning and look back at your answers carefully and you will see that you have not given any clear reports back.

Did you run Doddy's code !! if so what is the result?

I ran his code but the bit just hovers above the stock so I'm not sure if it's my machine or if the gcode has been setup to zero from the bottom of the material. I'll try and get a short video showing this.

Sent from my SM-N910F using Tapatalk

[Clive S]

I ran his code but the bit just hovers above the stock so I'm not sure if it's my machine or if the gcode has been setup to zero from the bottom of the material. I'll try and get a short video showing this.

Sent from my SM-N910F using Tapatalk

Did you zero your Z on the top of the part? You can see in his code:
G0 X0.0 Y0.0
G0 Z1.0
G1 F300.0 Z-0.4
G1 F800.0 X40.0
G1 Y40.0
G1 X0.0

That the Z will move to 1mm above the part and then sets the feed rate to 300mm/min and drops the Z to -0.4mm below the top of the part.

What do you mean by (just hovers) ie does it stay still or does it follow the intended path?

[dfox1787]

Did you zero your Z on the top of the part? You can see in his code:
G0 X0.0 Y0.0
G0 Z1.0
G1 F300.0 Z-0.4
G1 F800.0 X40.0
G1 Y40.0
G1 X0.0

That the Z will move to 1mm above the part and then sets the feed rate to 300mm/min and drops the Z to -0.4mm below the top of the part.

What do you mean by (just hovers) ie does it stay still or does it follow the intended path?

Yes I zeroed the top.

The z seems to move up the further it gets into the job.

This is on some scrap pcb board.

Sent from my SM-N910F using Tapatalk

[Clive S]

Yes I zeroed the top.

The z seems to move up the further it gets into the job.

Or the bed is going down. Have you levelled the bed and skimmed the top off?

[A_Camera]

Yes I zeroed the top.

The z seems to move up the further it gets into the job.

...or...

...the PCB is not fixed to the table. - Are you using double sided tape over the whole surface of the PCB?
...the PCB is not flat enough. - Measured over the whole area with a caliper?
...the PCB is not even in thickness. - Checked for variations with a caliper?
...the table is not levelled.
...the X is not levelled to the table surface and is tilting the Z.

PCB is not the optimal for this sort of tests but many things can be wrong. Work with the G-code given to you, once you can mill a square you can move on to making other things, but don't jump from one to the other type of code. Personally I think you have alignment issues somewhere. You have to align everything mechanically as good as possible, measure every angle BEFORE surfacing the table. The surfacing is the last moment, when everything else is as good as it can be.

When making PCB it is important that you fix the PCB over the whole area to eliminate warping or bending. At least if it is a large piece and if the PCB is low quality.

[dfox1787]

Sorry for the delay on this i ended up go away for a few days for work.

I changed my mach3 settings to the same as Kevs and it machined fine this time round.

https://youtu.be/Jq5Ni7jtQcs