1 Topic by gwfami (edited by gwfami 2013-10-16 15:23:15)

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Topic: Relationship between hole in nozzle and size of filament

I'm finally able to extrude PP with some sense of size consistency.  The problem that I'm running into is that I'm unable to get the filament to 1.75mm, usually being 1.2 mm or so in diameter.

My thinking is that I could increase the size of the hole in the nipple to adjust for this, but I'm uncertain how much larger to make it.

Is there a specific relationship between the hole in the nipple and the size of the filament or is it a 1:1 ratio?

Any ideas/thoughts would be greatly appreciated.

GWFAMI

2 Reply by elmoret

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Re: Relationship between hole in nozzle and size of filament

Hole in the nipple? You mean nozzle?

The relationship is due to die swell, which is a function of the polymer, temperature, and pressure. I would advise you to just move up one size at a time until at the desired diameter.

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3 Reply by gwfami

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Re: Relationship between hole in nozzle and size of filament

Yup, I meant nozzle size.

Do you use a drill press when you drill the nozzle?  I don't have access to one and wondered if a hand drill would work.

4 Reply by elmoret

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Re: Relationship between hole in nozzle and size of filament

I've used both. A hand drill is fine, especially since you have a pilot hole already.

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5 Reply by gwfami

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Re: Relationship between hole in nozzle and size of filament

Up about what, 1/4 mm at a time?

6 Reply by elmoret

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Re: Relationship between hole in nozzle and size of filament

Well, typically drill sizes are in 32nds or 64ths of an inch. The standard 1.75mm nozzle is drilled with a 1/16" bit, which leaves a hole of 1.58mm. You can move up to a 5/64" bit, which will make a hole of 1.98mm. That will probably get you in the ballpark.

If you have a metric set, you can probably go up 0.1mm at a time. I'd jump .4mm, then .1mm increments if you're using metric.

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7 Reply by gwfami

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Re: Relationship between hole in nozzle and size of filament

Thanks,
I'll try that tonight.

8 Reply by elmoret

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Re: Relationship between hole in nozzle and size of filament

Awesome. Once you sort it out, please post your findings here so people can benefit. Data that helps:

Resin manufacturer/ID
Nozzle temperature
Nozzle size (stock?)
Cooling (stock? additional?)
Filastruder placement (Vertical? Horizontal? How far off the ground?)

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9 Reply by gwfami

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Re: Relationship between hole in nozzle and size of filament

Once I'm able to get everything worked out, I'll start a new topic on extruding Polypropylene.

10 Reply by Bender666

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Re: Relationship between hole in nozzle and size of filament

Thanks, it helped me a lot!

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