Better nozzle with auto change?

[martin123]

Did you order the entire sett of nozzles?
I use mostly 0603 some 1206 and sot23 parts.
What type of nozzle models should I buy?

The play in your misumi parts, are they from the shaft OD less than 8mm or bearing OD greater than 8mm?

What is the reason for auto nozzle change not working with the CP40 nozzle?


Martin

[Pixopax]

Hello,

I got myself 5 nozzles, the 5 smallest,
Cp40 n045 1.0*0.45
Cp40 n08 1.5*0.8
Cp40 n14 2.2*1.4
Cp40 n40 6.2*4.0
Cp40 n24 4.0*2.4

The Bushings of Misumi did not match the hollow shaft exactly, I had 0.15mm air between inside of bushing and shaft.
That should be less than zero. So my shaft can still move sideways, the spring prevents that somehow.

The biggest problem at my machine was the airtube sticking in the hollow shaft. As the shaft turned around, the airtube bent to a certain point, until it slipped back. That resulted in large movements of my nozzle, visible in the Up-Cam on needle calibration, you could see it jumping around. That made every calibration inacurate, or better, totally useless. I now have one of those misumi air couplers on top of the shaft, which removes all movement due to the airtube. Definitely worth the money!

Since the liteplacer has a Z-Probe function, you cannot drive down the Z-Axis to push the holder into a new nozzle, that would trigger the Z-Switch, and the tinyG board would reset, ruining everything. So I will either change by hand or remove the Probefunction. At the moment, I only use small parts, so one nozzle is sufficient. Next week I have to build 14 large boards, we will see how it goes.

[martin123]

Would it not be possible to disable the z limit switch from in software when changing the nozzle?
You could use an analog switch controlled by one of the digital outputs on the tinyg card.


Sorry for being a bit slow, but I don not understand the sizes of the tips.
N08 is 1.5*0.8, this means that OD is 1.5 and ID is 0.8?
If that is correct 0603 is .6x.3mm so the nozzle is bigger than the chip, or is this incorrect and N08 and N14 will work for 0603 and SOT23?

Martin

[JuKu]

> Would it not be possible to disable the z limit switch from in software when changing the nozzle?

Of course it would. I made a separate thread about nozzle change software, please see http://liteplacer.com/phpBB/viewtopic.php?f=11&t=290.

[Pixopax]

Sorry for being a bit slow, but I don not understand the sizes of the tips.
N08 is 1.5*0.8, this means that OD is 1.5 and ID is 0.8?
If that is correct 0603 is .6x.3mm so the nozzle is bigger than the chip, or is this incorrect and N08 and N14 will work for 0603 and SOT23?

That is correct, N08 is 1.5 OD, N045 is 1.0mm OD.
I use the N045 for 0603

I will check if the N08 goes with 0603, but I guess it it a bit too large.

UPDATE: Yes, it works perfect, N08 is a bit larger that a 0603, but it goes really good. I will stuck at N08 for 0603 parts, that will do for SOT23 too.

[Pixopax]

This is my nozzlechanger, it is milled from 1.5mm fibreglass and a piece of 6mm Phenolic. Rocksolid.
And the best: It works

I only ran into some errors now and then, if I change a nozzle by hand and then start a placement. The Software (rmod) changes the nozzle correctly, moves to the hole in the tape, but then a command error comes up.
If I do not change Nozzle first it works. I could not figure out why this happens. Strange..

[martin123]

Thanks for the information. Will order a set of nozzles now.
The nozzle changes looks great.
Would be great if you could share the CAD files.

Martin

[Pixopax]

I will post the DXF-files, the upper part consists of 3 pieces of 1.5mm fibreglass.
You could use 1.5mm Aluminium too.

But you need to take the nozzles and move them a few times on and off the holder, they are pretty tight in the beginning.
After 20 times they will slip on better.

[JuKu]

IS there a reason to have three parts, wouldn't two parts and some washers work as well?

[Pixopax]

Yep, if you have 1.5mm washers, that would do too.

Attached is a dxf file.

And here is a video:
https://youtu.be/ifjFRyIPwdE