Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > General Off Topic Forums

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 05-31-2018, 03:46 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 941
Mechanical TV

Unfortunately with Peter Yanczers passing, I missed the window of opportunity to get one of his laser-cut Nipkow disks. I did get a color wheel but its long long gone unfortunately.

So I was wondering if anyone has his design or knew of anyone making replacements? I can probably find a laser cutting CNC service online somewhere but I dont have the original design files.

any ideas?
Reply With Quote
  #2  
Old 05-31-2018, 05:23 PM
Chip Chester Chip Chester is offline
VideoKarma Member
 
Join Date: Apr 2012
Posts: 605
I can get you in touch with people with laser cutters, if/when you have a need.
Reply With Quote
  #3  
Old 06-01-2018, 02:53 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 941
ok, but... that doesnt help me because I need the original nipkow disc files.
Reply With Quote
  #4  
Old 06-01-2018, 05:34 PM
rld-tv01's Avatar
rld-tv01 rld-tv01 is offline
VideoKarma Member
 
Join Date: Feb 2005
Location: Seal Beach, Ca
Posts: 524
Peter Yanczer's website is archived under the ETF web site. His page on building a nipkow disk is at http://www.earlytelevision.org/Yanczer/nipkow_disk.html

There are some Nipkow Disk 3D printer STL files on Thingverse. Most under $400 3D printers are limited to about 7X7X7 inches. My cheap 3D printer is limited to about a 7 inch circle.

https://www.thingiverse.com/thing:359858
https://www.thingiverse.com/thing:2701005
https://www.thingiverse.com/thing:2411633
https://www.thingiverse.com/thing:2414716
https://www.thingiverse.com/thing:66687

There are free programs for making and editing STL files such as
https://www.sketchup.com/products/sketchup-free
http://www.meshlab.net/#download

You can download a PC version of Sketchup which is good for 30 days trial or use the online version

I think there are some programs which can convert STL files to CAD files
Reply With Quote
  #5  
Old 06-01-2018, 05:48 PM
rld-tv01's Avatar
rld-tv01 rld-tv01 is offline
VideoKarma Member
 
Join Date: Feb 2005
Location: Seal Beach, Ca
Posts: 524
I have both Peter Yancer's Nipkow camera and viewer kit as well as his laser cut disks. His laser cut disks were 12 inch metal Nipkow disks while his Nipkow camera and viewer kit utilized about 8 inch nylon plastic disks. I've thought about 3D printing a mirror drum on my 3D printer. The mirror drum concept would be a 7 inch spoked disk about one inch thick with plastic tabs and screws to hold the 30 individual mirrors from flying off.

Last edited by rld-tv01; 06-01-2018 at 05:53 PM.
Reply With Quote
Audiokarma
  #6  
Old 06-01-2018, 09:38 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 4,663
The NBTVA in England may have discs for sale. Not sure how up to date their website is:
http://www.nbtv.wyenet.co.uk/clubshop.htm
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote
  #7  
Old 06-04-2018, 02:51 PM
rld-tv01's Avatar
rld-tv01 rld-tv01 is offline
VideoKarma Member
 
Join Date: Feb 2005
Location: Seal Beach, Ca
Posts: 524
I created a 7.5 inch Nipkow Disk 3D printer STL file using a 2D drawing to 3D output program. It requires about 17.5 meters of PLA plastic filament. There is 340 meters of plastic filament on a reel. My 3D printer would take approximately 5 1/2 hours to print the 7.5 inch disk. The disk is currently designed to be 2 mm thick. The 2D drawing and screen snapshot of the 3D file is attached. I might try printing one out in the next couple days when I'll be home all day. I just got the 3D printer a couple months ago and haven't printed anything which took over 1 1/2 hours to print.
Attached Images
File Type: jpg Yanczer_nipkow_04.jpg (39.5 KB, 8 views)
File Type: jpg Nipkow_3D_model.jpg (32.8 KB, 7 views)

Last edited by rld-tv01; 06-04-2018 at 02:58 PM.
Reply With Quote
  #8  
Old 06-04-2018, 04:11 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 941
I didnt think a 3D printer could get precise enough for those scan holes. But that is awesome!

I would like the 12" nipkow that yanczer had, but this is better than nothing. ;-) Cool think about the STL file is you can tweak it to any hub/motor you want.
Reply With Quote
  #9  
Old 06-04-2018, 04:27 PM
EdKozk2 EdKozk2 is offline
Tinker
 
Join Date: Mar 2014
Location: Elkhorn, WI
Posts: 491
Quote:
Originally Posted by rld-tv01 View Post
I created a 7.5 inch Nipkow Disk 3D printer STL file using a 2D drawing to 3D output program. It requires about 17.5 meters of PLA plastic filament. There is 340 meters of plastic filament on a reel. My 3D printer would take approximately 5 1/2 hours to print the 7.5 inch disk. The disk is currently designed to be 2 mm thick. The 2D drawing and screen snapshot of the 3D file is attached. I might try printing one out in the next couple days when I'll be home all day. I just got the 3D printer a couple months ago and haven't printed anything which took over 1 1/2 hours to print.
Just curious,
Is your program set to form rectangular scanning holes? I thought I remember reading in Peter Yanczers' work, he preferred rectangular holes. It gave a better quality image I believe he said.
Ed
Reply With Quote
  #10  
Old 06-04-2018, 06:42 PM
rld-tv01's Avatar
rld-tv01 rld-tv01 is offline
VideoKarma Member
 
Join Date: Feb 2005
Location: Seal Beach, Ca
Posts: 524
That's a problem with the program I used for conversion. The 2d JPEG used as input had rectangular shaped holes. The 3d File has 5 or 6 sided holes. I used https://www.shapeways.com/creator/2dto3d#landing to convert the JPEG image to a STL file. There are CAD like programs which create more accurate files. I tried the program using the gray level option and it produced cone shaped holes half way through the disk. Using the Black/white option it produced holes completely through the disk. The 3D program creates the object defined as a Mesh. Many free 3D programs have the ability to increase the resolution of the Mesh. I haven't actually printed out a disk yet so I don't know what the holes will look like. My 3D printer has one filament extruder. It would be interesting if a 3D printer with 2 filament extruders could print the holes filled in with clear filament so you would have a lens disk. I read somewhere there is clear optical grade filament.
Attached Images
File Type: jpg Disk_hole_mesh.jpg (68.5 KB, 6 views)

Last edited by rld-tv01; 06-04-2018 at 07:20 PM.
Reply With Quote
Audiokarma
  #11  
Old 06-04-2018, 11:46 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 4,663
Quote:
Originally Posted by EdKozk2 View Post
Just curious,
Is your program set to form rectangular scanning holes? I thought I remember reading in Peter Yanczers' work, he preferred rectangular holes. It gave a better quality image I believe he said.
Ed
Peter may have said rectangular holes are preferred, but I'm thinking his disks had round holes. The GE Octagon sets had rectangular holes, which were visible in the example I saw at the Ford Museum years ago.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote
  #12  
Old 06-06-2018, 06:22 PM
rld-tv01's Avatar
rld-tv01 rld-tv01 is offline
VideoKarma Member
 
Join Date: Feb 2005
Location: Seal Beach, Ca
Posts: 524
I printed out a 7 1/2 inch 2mm thick Nipkow Disk on my 3D printer. I held the disk up to the light to see if I could see through the holes. It appears I could see through the inner set of holes which are used for synchronization of the spinning disk. The outer set of holes used for scan of the picture were smaller. Some of them you could see through, some were partly filled in (translucent), others you couldn't see any light through. Also some of the inner set of sync holes were doubled (two small holes side by side). Mbates maybe you were correct in your comment that "3D printer could get precise enough for those scan holes". I recently paid $392 new for my 3D printer which I think is probably representative of most 3D printers under $500. I may try to enlarge the smaller holes and fill in the duplicate holes. It took about 5 1/2 hours to print and about $1.50 in material. The 3D printout had a glitch on one edge. I think this may be due to excess filament left in the printer from previous print. I cleaned excess filament off the outside of the nozzle but did not remove the nozzle to clean out the inside.
Attached Images
File Type: jpg Nipkow_test_01.jpg (34.1 KB, 7 views)
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:01 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.