Grab mechanism for feeder.

[Alexander]

Grab mechanism for feeder. Makes a rectangular movement 4mm, thickness 10mm.

[Alexander]

Video of work.

https://youtu.be/eSgBGhYHlw8

вторник, 2 августа 2022 г. в 12:39:34 UTC+3, Alexander:

[Litterio Andrea Guainella]

Hi Alexander,

first of all: good job!! 👏👏

I'd like to make suggestion if you appreciate.

In my opinion it is possible to improve the pin that drags the tape. Conical instead of cylindrical because often the dimensions of the holes are not all the same.

In this way the conical tip fills any discrepancy.

LAG

[Jason von Nieda]

Nice work Alexander! This is a very novel way of feeding I don't think I've seen before. I like it!

Jason

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[Shai]

Very interesting. I am curious though, how do you plan to stop it at the right time so that you can peel the cover off without it pulling the smt tape in reverse? Watching the video it seems like there's a small window of opportunity in time to pause the gears? Are you able to modify the gear mechanism to buy more time before it disengages ?

[Alexander]

Changed the mechanism.

youtube 

среда, 5 октября 2022 г. в 04:25:11 UTC+3, Shai:

[Litterio Andrea Guainella]

Hi Alexander,

good job... 👏👏

LAG

[Markus Oberle]

Hi Alex,

nice job, I like it.

Do you have already a final formfactor in mind?

[Alexander]

Model tests for the accuracy of the mechanism.

youtube  https://youtu.be/MSYOhLU7ptw

воскресенье, 16 октября 2022 г. в 01:29:55 UTC+3, markuso...@googlemail.com:

[Alexander]

A little advanced in the manufacture of the feeder.

четверг, 20 октября 2022 г. в 14:25:00 UTC+3, Alexander:

[Litterio Andrea Guainella]

Good Job Alexander...

Do you think provide a video for purpose?

LAG

[Alexander]

I'll post the video when it's ready. 1-2 months.

среда, 23 ноября 2022 г. в 15:56:57 UTC+2, ls.info...@gmail.com:

[Jon Raymond]

Really interesting looking mechanism. Looking forward to watching your development of this.

[Александр Астраханцев]

ср, 23 нояб. 2022 г. в 17:57, Jon Raymond <dirtye...@gmail.com>:

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[Alexander]

Feeder test tape 0402.   https://youtu.be/HqOC2bd0yFc

понедельник, 6 марта 2023 г. в 05:19:47 UTC+2, Alexander:

[Mike Menci]

Aleksandr can you show which mechanics are you using?

[Alexander]

Feeder 12 mm, with installation on an aluminum profile.

воскресенье, 21 мая 2023 г. в 16:41:45 UTC+3, mike....@gmail.com:

[Ben]

very nice.

[M. Mencinger]

With electronics you control warm to do 1 turn only for 4mm tape advancing? 

Mike

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[Alexander]

One magnetic hall sensor cannot work with two magnets, for 2mm tape movement.
One turn of the feeder mechanism = 4 mm of tape movement.

понедельник, 22 мая 2023 г. в 13:50:10 UTC+3, mike....@gmail.com:

[Mike Menci]

If you use   line sensor which detects the black line on a white background you can do it each 2mm tape advancing 

Imagine your Worm on end of N20 gear Motor exit shaft.

See its operation here; https://youtu.be/iHhMKi98kfg

[Mike Menci]

You search eBay or AliExpress for this enclosure 

Sent from my iPhone

On 22 May 2023, at 17:28, Mike Menci <mike....@gmail.com> wrote:

If you use   line sensor which detects the black line on a white background you can do it each 2mm tape advancing 

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/04cc1900-d1f8-485b-bfe0-0df71fdc4729n%40googlegroups.com.

<12V DC_half turn N20.jpg>

[Alexander]

The sensor is currently set to linear travel. In the video, I will assume that the magnet is on the motor shaft, these are rotational movements. For the arrangement shown in the video, the motor needs 24 revolutions to make a full cycle of 4 mm linear movement.
It needs a controller, I'm a bad programmer.

понедельник, 22 мая 2023 г. в 19:13:58 UTC+3, mike....@gmail.com:

[Mike Menci]

Alex, 

Can you please clarify - the motor needs 24 revolutions for 4mm tape advancing

or the shaft at the end of Motor Gearbox needs 24 revolutions to make 4mm tape advancing 

[Alexander]

On the output shaft, the gear motor must make 24 revolutions = 4 mm linear movement cycle of this mechanism.

понедельник, 22 мая 2023 г. в 20:10:52 UTC+3, mike....@gmail.com:

[bing luo]

Your worm looks very accurate when it rotates half a turn or one turn. I use a photoelectric switch for position detection,

But it always has deviations and won't stop at the same position every time. I have also ordered magnets and Hall sensors, hoping to make some improvements.

[Alexander]

bing luo,  I tested optical and magnetic position sensors, optical gave better results in terms of accuracy. When testing the magnetic sensor, a miniature round magnet 1 mm was used.

вторник, 23 мая 2023 г. в 19:55:26 UTC+3, tianl...@gmail.com:

[Mike Menci]

N20 gearbox with motor and BLACK COLLAR on white plastic =  line sensor which detects the black line on a white background

Here the photos of assembly : 

[Mike Menci]

Just a note: This works good in enclosure, which means sensor is in complete darkness and it works!

Mike

[Alexander]

The implemented black and white stripe recognition solution was created by Mikhail Yurov five years ago.
https://www.youtube.com/watch?v=0t2hQxZ6_u4&t=9s

среда, 24 мая 2023 г. в 12:09:49 UTC+3, mike....@gmail.com:

[Alexander]

среда, 24 мая 2023 г. в 12:22:23 UTC+3, Alexander:

[Alexander]

Optical sensor test. https://www.youtube.com/watch?v=p_or0HVSqj8

среда, 24 мая 2023 г. в 12:57:32 UTC+3, Alexander:

[bing luo]

Very good testing,   This still   need an STM8  to receive this optical signal and then control the start and stop of the motor。

[DoTheDiy (Apoorv Chaudhary)]

Very unique design. Last night I spent quite some time understanding reuleaux triangle but could not figure out :) the calculation for design to advance 4mm. If anyone knows this please explain 

[DoTheDiy (Apoorv Chaudhary)]

Did a quick mockup to understand it further will print and try

[M. Mencinger]

You can find web based calculator here: 

https://rechneronline.de/pi/reuleaux-triangle.php

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/78791538-f818-4a18-98f7-2532ee02931an%40googlegroups.com.

[Alexander]

Interesting, curiosity. What printer model, repeatability and accuracy will turn out. Need up to 0.03 mm.
In addition to the mechanism itself based on the pello figure, you need a worm shaft made accurately. It is very doubtful that this can be made on a 3D printer.

суббота, 3 июня 2023 г. в 17:08:12 UTC+3, apoo...@gmail.com: