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Functioning Voight-Kampff Machine
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8th_Passenger
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PostPosted: Mon Apr 24, 2017 1:38 pm    Post subject: Reply with quote

LearnByMaking,

I think buikding the bar graphs from scratch is the only way to go.

As your are doing choose the best LED size and build a housing to fit the space above your main monitor. The commercially available ones are way too small. About 20mm too small I think.

Like the video. Keep them coming.

Enjoyed the music too.


Colin
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LearnByMaking
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PostPosted: Sun Apr 30, 2017 12:50 am    Post subject: Reply with quote

8th_Passenger - glad you liked the background music (I had it playing as motivation to keep pushing forward).

After looking at commonly available rectangular LED's and experimenting with different spacing between the LED's, etc., I finally came to the realization that the 2x5mm LED's I have would actually fit perfectly (and look much like the original - for the 430mm width dimensions) just by reducing the spacing between the LED's to about 0.44mm. I'll post the drawings up soon when I have the time to pull them back out and take a picture.

If anyone can help - I'm looking for some information on the "Eye Piece" dimensions. I've been using the picture of the Remington rotary shaver blade:


My concern is which portion of the eyepiece does the 22mm measurement refer to (“A”. “B”, or “C” - in the picture below?):


From this picture it seems to be “B” (it actually looks like it has the ridges of the rotary blade). In my initial scaling I had assumed that the 22mm referred to “C” dimension (which makes entire eyepiece much smaller as well as the arm, pulley wheels, etc.). From other views of the eyepiece I thought the 22mm might refer to the inner iris, “A” in the above picture (which makes all the related parts larger). Anyone have an is to which one it is?

This issue came up while I was working on a 3D model of a part of the VK arm close to the eyepiece:


I'm thinking I need to resize (change the scale factors) of all of my portions of the arm on the VK!
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8th_Passenger
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PostPosted: Sun Apr 30, 2017 4:21 am    Post subject: Reply with quote

LearnByMaking, I've been working off dimension "B" to scale the eyepiece.

Unfortunately changing one dimension on this thing throws lots of others dimensions out.

Are you managing to fit everything into a 430mm width?


My latest drawing is coming in at 415mm wide.

I decided that with a 400mm wide unit I couldn't keep the 15mm buttons and the graphics would be too small.

So I listened to joberg.

415mm wide is the smallest I can go to keep those sizes intact.

How this will impact on everything else I don't know.



Colin
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joberg
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PostPosted: Sun Apr 30, 2017 8:34 am    Post subject: Reply with quote

LearnByMaking, the eye piece is 22 mm including the rim!

If you want the eye to look like the original, you'll have to remove the rim and use the grill part only (well, you don't have to remove it physically, but hide it).
So the new measurement is 20 mm.
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LearnByMaking
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PostPosted: Thu Jun 08, 2017 11:06 pm    Post subject: Reply with quote

I've been trying to get a video of my functioning Voight-Kampff “arm” filmed and posted for more than a week now, finally I recorded it and now I can post it and here it is:
https://youtu.be/6a5OixgRGpI

After re-writing my control code multiple times I finally realized what I was doing wrong – I simply needed to change my conditional statements from “if” to “while”. An embarrassing mistake but all to easy to miss when I haven't had anyone else look at my code (to easy to read “into” your own writing – if I'd had someone else look at it they would have caught it immediately – “palm to forehead” moment).

Well anyway, it's fixed and working correctly now. I do still need to add a “retract and store” sequence but that is fairly simple now and will depend on the types of end-stops I use to detect the positions of the different moving parts.

I'm continuing to work on modeling, what I refer to as, the “eye” servo box. I haven't added all the details yet since I'm still trying to finalize the scale (in reference to the “shaver”). One attempt is visible in the current video (3D-printed the front half, filled lines with “Bondo Glazing and Spot Putty”, sanded, primed and painted black).

The screens on the VK are continuing to give me headaches – I made cutouts of the different available LCD screen sizes (that support “component input” and 4:3 aspect ratio) just so that I could check out how they might work. I've also been attempting to use some old CRT viewfinder's (salvaged from VHS Video Camera's) and trying to project the image onto a mini screen. So far this has been unsuccessful, I should be able to make it work but haven't figured out what lenses I need and if I can can make the mini CRT's light output enough light to make a projection onto a visible (at least in in low indoor lighting). I've been using live video from a security camera as a video feed but I want to test everything again using a “component video” feed from an old VCR (or just straight from the component video output of a Raspberry Pi).


Currently 3.5", 2.5", 2.0", 1.0" diagonal screens all seem to still be 4:3 aspect ratio, 4.3" and 5" diagonal screens are wider.

In answer to 8th Passenger - Currently my goal is a 430mm wide V.K. But this could still change depending on final screen sizes.

Want to say thanks to Joberg, and 8th Passenger for all their build documentation and help so far.
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Last edited by LearnByMaking on Thu Sep 28, 2017 10:03 pm; edited 2 times in total
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LearnByMaking
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PostPosted: Thu Jun 08, 2017 11:11 pm    Post subject: Reply with quote

Oops, thought I included a photo of the "Eye Servo Box". Anyway, here it is:

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joberg
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PostPosted: Fri Jun 09, 2017 6:53 am    Post subject: Reply with quote

So far so good...question: the Eye Gear Box (EGB) is just for a trial (weight/performance)?

Yes, those screens are a PITA for sure! Difficult to say the least.

Thanks for the thanks Wink and keep up the good work!
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LearnByMaking
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PostPosted: Fri Jun 09, 2017 3:27 pm    Post subject: Reply with quote

I worked up the EGB mainly to see how the servo motor fits inside but also to get a better idea of the proportions. The final weight of the EGB should be less than this model (plan to cast it in resin). The initial test 3D Print that I used had a number of areas that printed poorly due to how I oriented the model on the print platform. After re-calibrating my printer and changing the orientation (initially printed with outside surface down, re-printed with outside surface up). Most recent test print (I shaded the print with pencil to make contours more visible):


This print still lacks the missing details: ridged area next to half sphere, correct alignment of guide rod into EGB, servo motor shaft location, additional wire entrance below the servo motor shaft (and probably other details I haven't noticed yet).

The added weight of just this half shell did introduce an issue I hoped to avoid: torque on the rod, as a result I will need to add a something to keep the extension rod from twisting (a groove in the bushing with a matched raised area on the rod seems easiest - I think Joberg mentioned something like this before).
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8th_Passenger
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PostPosted: Sat Jun 10, 2017 4:17 am    Post subject: Reply with quote

LearnByMaking, Love the video of the arm raise. looks like thats working really well. You must be pleased.

Hopefully you can get your EGB print looking sharper. Your clear print in the last post looks better.

I had wondered if you could use a 'mini' digital projector to project the video's onto the backs of the screens. The screens would have to be some sort of rear projection material! Also you would need three projectors. Aligning them would be a nightmare I'm sure.

Its going to make a big difference to the overall look if all the monitors can be 4.3.

I guess the search continues...


I'm having a little break from my VK endeavours.


Colin
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joberg
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PostPosted: Sat Jun 10, 2017 8:29 am    Post subject: Reply with quote

Better print for sure and, as you've mentioned, lots to do still on that EGB.

Btw, that EGB is permanently affixed to the rod (glue it to that piece once and for all, no need of a groove or other fixes).
So, here's the movement in order:

1: the entire arm raises the EGB + Eye from the trench in one motion (as far as I know/sources I talked to).

2: The arm is then extending the rod to its position/apex (again, EGB is in the proper position, facing the operator/subject, and the Eye is still folded and at a 45 degree angle).

3: Now that steps 1 and 2 are completed, the Eye can now be turned-up (that means that the angle that the Eye occupied in the trench is angled at 45 degrees; to make it "straight" is has to be moved by hand!)

4: Now that the Eye is straight (parallel to the top of the machine) it can be raised toward the subject.

The problem, as you can see, was that the Eye had a 2 movement combo that was never achieved by the team working on the machine (not enough time and complicated).
That's why you only see step 4 in the movie: the Eye is moving toward Leon, but you don't see it pivoting to a parallel position to get to that point.

If you were to keep the Eye in its normal angle, it would never face the subject straight-on.

I know, it sucks...but I don't see how you can achieve 2 movements with one motor. I'm no specialist, as I said before, but for weight/space challenges it's going to be impossible.

One con vs. 3 pros...still a winner! Wink
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8th_Passenger
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PostPosted: Sat Jun 10, 2017 2:15 pm    Post subject: Reply with quote

joberg, you have lost me a bit on how the arm and eye raises.

Surely once the arm raises to 45 degrees the eye piece is now in the correct orientation to be raised into a vertical position.

Or am I missing something?


Colin
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LearnByMaking
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PostPosted: Sat Jun 10, 2017 3:16 pm    Post subject: Reply with quote

I'm missing this also (I'll replay my clips from the scenes with Leon and Rachel and hopefully I'll figure it out).

I described the point that I'm now getting some rotation poorly, instead of at the connection of the rod to the EGB I meant at the base of the rod at the metal block. Here's an illustration:

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joberg
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PostPosted: Sun Jun 11, 2017 6:15 pm    Post subject: Reply with quote

Colin, I think that a pic will be better Wink



See how the Eye piece is at an angle into the trench? Now, imagine raising the arm straight up...well, that Eye piece is still at the same angle.

You have to have a 2 movement combo to first: put the Eye straight (that is parallel to the top of the machine. And two: raise the Eye straight-up, facing now the subject being interrogated.

As I said before, the only movement we see in the movie is # 2.
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8th_Passenger
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PostPosted: Mon Jun 12, 2017 1:49 am    Post subject: Reply with quote

I see what you are saying now.

But doesn't it sit like this in the trench?





Colin
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LearnByMaking
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PostPosted: Mon Jun 12, 2017 2:33 am    Post subject: Reply with quote

Just the photo I was looking for (just couldn't find a link to it).

If I understand Joberg correctly (please correct me if I am wrong); the initial intention was to include that extra movement - according to communication that Joberg had with with someone who worked on the original.

Definitely confusing, had not come across any suggestion of an additional plane of rotation. It is possible to incorporate this with a single motor but that type of gearing mechanism is beyond my capability to design right now.

I think I'll have to stick to a 3 step movement for now (arm raise, extend, rotate eye up). It would be awesome to have that additional movement though.
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joberg
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PostPosted: Mon Jun 12, 2017 7:00 am    Post subject: Reply with quote

Colin: yes, it's supposed to rest that way in the trench, so when the arm is raised the Eye should be in the right position (parallel to the top) and ready to be raised straight, facing the subject.

It's just that, for some reason, the Eye piece had a tendency, when the arm was rising (remember, when the arm is rising, the rod is extending as well at the same time), to droop (weight was a factor) and they were never fully successful into making that piece work properly Crying or Very sad

That's why we're only seeing the last step: Eye is rising toward the subject (after many takes Wink ).

Mike Fink always said that this was a rush job...you couldn't expect much more then what was achieved by the team (and it was a miracle it "worked" as it did during principal photography).
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joberg
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PostPosted: Mon Jun 12, 2017 7:04 am    Post subject: Reply with quote

LearnByMaking: don't sweat it, I'm sure that with the tech we have today (3d printing) the weight factor would be greatly reduced, hence making the Eye piece less prone to droop.

If I were you, I would also 3D print the Remington grill (less weight) Wink
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joberg
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PostPosted: Tue Jun 13, 2017 6:44 am    Post subject: Reply with quote

Of course, one way to secure the Eye onto the EGB would be to glue the rod holding the piece in place (that is: respecting the angle of those fins in the trench...more calculation: you want those fins at the right angle).
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LearnByMaking
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PostPosted: Tue Jun 20, 2017 1:07 am    Post subject: Reply with quote

Took me longer than expected to film, edit and post this but here it is:
functioning test for the VK bellow's. Turned out to be easier than expected but will take a little while to smooth out the motion (some coding tweaks and minor mechanical improvements).
Anyway, here's the video link:
https://youtu.be/tpD5daSl-u4
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joberg
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PostPosted: Tue Jun 20, 2017 6:50 am    Post subject: Reply with quote

Beauty! When the vacu-formed bellow will be together, you'll just have to cut a slot at the top of each one of them to get the arm to travel and touch the first bellow on top.

Good stuff, eager to see the next update!
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