[Jim Dawson]

All I need is that math formula and I need to try it to see if I will end up with better results.

You mentioned it works just like TPI, for the most part the designer software tells me how fast both the carriage and the mandrel need to move in order to get the desired winding angle. It is just determining the amount of turns and the C advance to end up with proper filament placement is what I don’t know how to obtain.


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Let me think about that for a bit.

Known variables:
Winding angle
Filament width
Carriage Speed
Mandrel Speed
Length of wind

Unknowns:
Lead
Total turns
C advance

The 3 unknowns can be calculated from the known variables, I just need to figure out the formulas that you can plug into Excel. I'll work on this a bit this evening.

[SinfulDarkLord]

Let me think about that for a bit.

Known variables:
Winding angle
Filament width
Carriage Speed
Mandrel Speed
Length of wind

Unknowns:
Lead
Total turns
C advance

The 3 unknowns can be calculated from the known variables, I just need to figure out the formulas that you can plug into Excel. I'll work on this a bit this evening.

Thank you I greatly appreciate it. By the way here is some info for those known variables, hopefully it will help.

Winding angle: 65 degrees
Filament width: 1/8”
Carriage speed: 2.55 in/s
Mandrel speed: 29.8 RPM
Length of wind: 16”

These variables are for a 3.5” diameter aluminum mandrel that is 24” long.


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[Jim Dawson]

Take a look at this forum post. https://www.rocketryforum.com/thread.../#post-1689467

Where it talks about ''P='', I think that this gives you the dwell in seconds that can be converter to an angular position advance based on the spindle RPM. Or in the case above Spindle RPM = 29.8, thus 360*29.8= 10728 degrees/Min or 178.8 degrees/second.

As best I can tell, it looks like your controller requires a G4 dwell parameter that must be in degrees rather than the normal P= milliseconds or seconds.

Short of replacing your controller with a more standard CNC controller I don't know how to get around this.

[SinfulDarkLord]

Take a look at this forum post. https://www.rocketryforum.com/thread.../#post-1689467

Where it talks about ''P='', I think that this gives you the dwell in seconds that can be converter to an angular position advance based on the spindle RPM. Or in the case above Spindle RPM = 29.8, thus 360*29.8= 10728 degrees/Min or 178.8 degrees/second.

As best I can tell, it looks like your controller requires a G4 dwell parameter that must be in degrees rather than the normal P= milliseconds or seconds.

Short of replacing your controller with a more standard CNC controller I don't know how to get around this.

Hi Jim,

Apologies for the late reply, I have been busy as of late. I finally got some down time.

I can definitely add a dwell time in seconds. I am going to do the math and I will let you know if I get some good results later today.

Thank you for your help


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[SinfulDarkLord]

Take a look at this forum post. https://www.rocketryforum.com/thread.../#post-1689467

Where it talks about ''P='', I think that this gives you the dwell in seconds that can be converter to an angular position advance based on the spindle RPM. Or in the case above Spindle RPM = 29.8, thus 360*29.8= 10728 degrees/Min or 178.8 degrees/second.

As best I can tell, it looks like your controller requires a G4 dwell parameter that must be in degrees rather than the normal P= milliseconds or seconds.

Short of replacing your controller with a more standard CNC controller I don't know how to get around this.

Hi Jim,

It has been awhile. I did not get any good results and in the end I decided to swap out the current controllers with better controllers and to have use of a better software.

I will be using LinuxCNC. I heard it is great and after seeing some DIY youtube videos of filament winders that use LinuxCNC, it goes to show that it will work for the task at hand.

I don’t have the controllers in yet so I don’t have much to work with. My priority is getting LinuxCNC installed in a computer.

Do you happen to know a thing or two about LinuxCNC?


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