Nozzle suction
0xBERNDOG opened this issue · comments
My pump has good suction, but it's all lost when going through the nozzle
Did you do anything in particular to seal it? I'm trying to diagnose where the losses are coming from
The most likely causes I can see:
- loose fit of the bearing at the top of the nozzle
- loose fit of the PTFE tube inside the bearing
When you say lost suction, what do you mean? Do you have nozzle tip installed? There is no suction from the nozzle at all or only small amount of air coming from noze tip?
I didn't do anything special, when you fit the bearing on the top, is it tight? Also I have found sometimes the nozzle tip print out could have air leakage if not pirnted well, I normally connect the air output port of the pump and put the nozzle into water and check where is leaking. Or simply blowing into the nozzle while blocking the other end by hand to check if nozzle itself is leaking.
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Subject: Re: [xpDIY/3DPlacer] Nozzle suction (Issue #16)
The most likely causes I can see:
* loose fit of the bearing at the top of the nozzle
* loose fit of the PTFE tube inside the bearing
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I identified the problem areas, and fixed it by modifying the mesh in fusion360:
- The bearing was loose, so I made the hole 12.10mm diameter
- My O-rings were actually 1.5mm tall, so they weren't sealing against the nozzle. I modified the end to pull the nozzle further down so that it properly squashes the O-ring
Now I can pick up my OpenPnP test pieces (hole punches) :)
ok, glad it worked for you! I think it make sense to make parts with different tolerance..
A parametric model would work well, so the user can adjust the tolerance parameters
The new nozzle was a bit thin for me, and my printer sucks, so I dipped the whole lower part in conformal coating and let it drip dry. It has way better suction now.