New method for spinning real Ground Glass

Keith Wakeham · September 12th, 2005, 12:23 PM

seems like your making some progress wayne, glad to hear, but to bad about the fingers. I kn ow that they make stab proof clothing, maybe you can get some gloves made out of it to protect the fingers.

Wayne Kinney · September 12th, 2005, 12:28 PM

Keith,
I really should take safty more seriously:D

Maybe some simple gardening gloves could be in order. I do stress to anyone thinking of using this method BE CAREFULL!!!!

Wayne.

Frank Ladner · September 13th, 2005, 01:41 PM

Wayne: I have the housing, motor, condensers, achromats, ground glass, etc...but I am undecided on the best way to mount the glass to the motor shaft.

I am thinking there should be a rubber interface for two reasons: #1 - To reduce the chance of shattering due to sudden movements (if the glass is rigid-fixed to the shaft) #2 - To allow the glass to automatically even / balance itself out (because I am working with low-tech tools and can't guarantee it will be mounted in such a way as to have no Z/depth-motion - so it is easier for me to let it spin itself straight.)

What you've posted about mounting the glass, THEN spinning it slowly and marking the circle - that is an excellent idea. However, I don't have a circular glass cutter so that wouldn't work well for me.

I've sortof slowed down on experimentation due to hurricane Katrina and some house damage (no electricity or phone service at home at the moment), but I will be sure to post pictures when I get something going.

Thanks!

Wayne Kinney · September 13th, 2005, 04:31 PM

Frank,
Nice to see you here! i changed my method so you only nee a normal straight line glass cutter, if the cutter can be hold on the glass in a fixed position, then rotate the glass in the fan motor by hand, there by scoring the glass in a perfectly centred circle. I used a small model car/airplace wheen on the other side of the glass under the cutter to support the pressure of the cutter.

I hope you succeed with your method, frank.

Wayne.

Wayne Kinney · September 14th, 2005, 05:45 PM

And there we have it! 1 spinning ground glass.

http://homepage.ntlworld.com/wayne.k...nd%20glass.jpg

Thanks,
Wayne.

Bill Porter · September 14th, 2005, 06:47 PM

Nice job! Good on ya for persevering.

Glen Hurd · September 14th, 2005, 06:52 PM

Way to go! You gotta be feeling pretty good about that!
Congratulations.

G

Wayne Kinney · September 14th, 2005, 07:07 PM

Thanks Bill and Glen,

Yeah I got there in the end, modified my original method slighty, but got there. Hope to have the thing all housed and some test footage up tomorrow, only if people are interested though.

Glen, yeah it feels pretty good, at times i thought it was not going to work, but i JUST DID NOT want to use plastic, IT HAD TO BE GLASS!!! Im very happy, still ironing out my method to improve things. BTW, the glass is 1.5mm thick.

I would like to thank Keith Wakeham for helping me with the technical side of the fan motor and also about power options, Greg Boston and Ben Winter for sujestions for centring the disk, Bill Porter and Glen Hurd for help and guidance of glass cutting and thanks for all else for moral support.

Thanks,
Wayne.

Ben Winter · September 15th, 2005, 07:05 AM

I don't know if anyone else has mentioned this, but redrockmicro.com sells replacement ground glass for their spinning system for $25 on their site. Since it's designed for the exact same purpose I bet this would be a good way to go and it's a heck of a lot easier than grinding your own and balancing out the center.

And thanks for the props Wayne!

Glen Hurd · September 15th, 2005, 07:33 AM

Yeah, and who's going to NOT be interested in your test footage! :)
Personally, I would look forward to people's test footage everyday, but that's just me.
I'm just now discovering that there are a lot of things to discover regarding choice and placement of lenses for these systems (thanks, in part, to Wayne's pictures -- kinda got me off my a$$ and doing some experiments of my own). There also appear to be some subtle "gotchas," in there too.
So here's to your first spinning glass disk, and to more samples of what it can do. (clink of glasses)

G

Wayne Kinney · September 15th, 2005, 08:21 AM

Ben,
I have heard that the reddockmicro glass is not actually glass but a type of plastic, i could be wrong though. I also heard that the $25 replacement glass is only for customers that purchased the main unit. Again, correct me if im wrong, but thanks for pointing that out.

Still adjusting the housing and that, but hope to have test footage up later.

Thanks,
Wayne.

Wayne Kinney · September 16th, 2005, 10:12 AM

Ok guys,
Finally got everything together and got some quick test shots with my new baby. My first impressions are that im very pleased, but i need to adjust the condesor lens as the distance is not correct. Here is the link, 46MB quicktime file:

http://homepage.ntlworld.com/wayne.k...ter_Test03.mov

Please keep in mind that these shots are filmed with a cheap 1 CCD panasonic cam like this one: http://www.skala.nl/usr_img/webshop/19/PA-NVDS30.jpg

You will notice both slight barrel distortion and slight vignetting, but this is due to the condensor distance. You can see the barrel distortion on the shot looking through the balcony rails. As in my experiements in my other thread with the condensor lens, 11mm away from GG seems to be optimum. I'll do some adjusting and get some more shots. There is also a slight bit of dust on the consensor lens. BTW, im recording the full 36x24mm frame area.

Anyhow, let me all know what you think so far. Im also working on a commercial unit with 15mm rod support that will be coming in the near future.

Thanks,
Wayne.

Marius Luessi · September 16th, 2005, 10:23 AM

Quote:

Originally Posted by Wayne Kinney

Ok guys

SWEET!!!!!
(the aspect ratio seems a little off though, that fan looks rather oblong! ;-)

Nice job; looks awesome!

Craig Bellaire · September 16th, 2005, 01:51 PM

Someone did it with REAL glass.. Did I miss it or has someone made a guide for this setup? Cause I'll make one... Also Red Rock is plastic cause I had one and they also went up from $10.00 to $25.00... WOW... Thanks...

OK I found the guide but didn't know if this is the updated guide... Also I've had frosted window film placed on glass before for this purpose and it has been the most crisp of anything I've tried... thanks again

Craig Bellaire · September 16th, 2005, 02:10 PM

OK the footage looked the best I've seen in a very long time... I think I'm back in the game of making my 3rd adapter... WOW looks very nice...

September 15th, 2005, 07:05 AM	#39
Ben Winter Trustee Join Date: Jun 2005 Location: Hollywood, CA Posts: 1,675 Images: 1	I don't know if anyone else has mentioned this, but redrockmicro.com sells replacement ground glass for their spinning system for $25 on their site. Since it's designed for the exact same purpose I bet this would be a good way to go and it's a heck of a lot easier than grinding your own and balancing out the center. And thanks for the props Wayne! __________________ BenWinter.com

September 16th, 2005, 10:12 AM	#42
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Test Footage Uploaded Ok guys, Finally got everything together and got some quick test shots with my new baby. My first impressions are that im very pleased, but i need to adjust the condesor lens as the distance is not correct. Here is the link, 46MB quicktime file: http://homepage.ntlworld.com/wayne.k...ter_Test03.mov Please keep in mind that these shots are filmed with a cheap 1 CCD panasonic cam like this one: http://www.skala.nl/usr_img/webshop/19/PA-NVDS30.jpg You will notice both slight barrel distortion and slight vignetting, but this is due to the condensor distance. You can see the barrel distortion on the shot looking through the balcony rails. As in my experiements in my other thread with the condensor lens, 11mm away from GG seems to be optimum. I'll do some adjusting and get some more shots. There is also a slight bit of dust on the consensor lens. BTW, im recording the full 36x24mm frame area. Anyhow, let me all know what you think so far. Im also working on a commercial unit with 15mm rod support that will be coming in the near future. Thanks, Wayne.

September 16th, 2005, 01:51 PM	#44
Craig Bellaire Major Player Join Date: Aug 2004 Location: Rochester, NY Posts: 422	WOW Finally Someone did it with REAL glass.. Did I miss it or has someone made a guide for this setup? Cause I'll make one... Also Red Rock is plastic cause I had one and they also went up from $10.00 to $25.00... WOW... Thanks... OK I found the guide but didn't know if this is the updated guide... Also I've had frosted window film placed on glass before for this purpose and it has been the most crisp of anything I've tried... thanks again __________________ Craig Bellaire www.VerticalVideoSolutions.com

September 16th, 2005, 02:10 PM	#45
Craig Bellaire Major Player Join Date: Aug 2004 Location: Rochester, NY Posts: 422	Footage OK the footage looked the best I've seen in a very long time... I think I'm back in the game of making my 3rd adapter... WOW looks very nice... __________________ Craig Bellaire www.VerticalVideoSolutions.com

September 12th, 2005, 12:23 PM	#31
Keith Wakeham Major Player Join Date: Jan 2005 Location: St. John's, NL, Canada Posts: 416	seems like your making some progress wayne, glad to hear, but to bad about the fingers. I kn ow that they make stab proof clothing, maybe you can get some gloves made out of it to protect the fingers.

September 12th, 2005, 12:28 PM	#32
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Keith, I really should take safty more seriously:D Maybe some simple gardening gloves could be in order. I do stress to anyone thinking of using this method BE CAREFULL!!!! Wayne.

September 13th, 2005, 01:41 PM	#33
Frank Ladner Major Player Join Date: Aug 2003 Location: Poplarville, MS Posts: 453	Wayne: I have the housing, motor, condensers, achromats, ground glass, etc...but I am undecided on the best way to mount the glass to the motor shaft. I am thinking there should be a rubber interface for two reasons: #1 - To reduce the chance of shattering due to sudden movements (if the glass is rigid-fixed to the shaft) #2 - To allow the glass to automatically even / balance itself out (because I am working with low-tech tools and can't guarantee it will be mounted in such a way as to have no Z/depth-motion - so it is easier for me to let it spin itself straight.) What you've posted about mounting the glass, THEN spinning it slowly and marking the circle - that is an excellent idea. However, I don't have a circular glass cutter so that wouldn't work well for me. I've sortof slowed down on experimentation due to hurricane Katrina and some house damage (no electricity or phone service at home at the moment), but I will be sure to post pictures when I get something going. Thanks!

September 13th, 2005, 04:31 PM	#34
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Frank, Nice to see you here! i changed my method so you only nee a normal straight line glass cutter, if the cutter can be hold on the glass in a fixed position, then rotate the glass in the fan motor by hand, there by scoring the glass in a perfectly centred circle. I used a small model car/airplace wheen on the other side of the glass under the cutter to support the pressure of the cutter. I hope you succeed with your method, frank. Wayne.

September 14th, 2005, 05:45 PM	#35
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	And there we have it! 1 spinning ground glass. http://homepage.ntlworld.com/wayne.k...nd%20glass.jpg Thanks, Wayne.

September 14th, 2005, 06:47 PM	#36
Bill Porter Major Player Join Date: Mar 2005 Location: Ventura, California, USA Posts: 751	Nice job! Good on ya for persevering.

September 14th, 2005, 06:52 PM	#37
Glen Hurd Regular Crew Join Date: Jul 2005 Location: Burlington, NJ Posts: 59	Way to go! You gotta be feeling pretty good about that! Congratulations. G

September 14th, 2005, 07:07 PM	#38
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Thanks Bill and Glen, Yeah I got there in the end, modified my original method slighty, but got there. Hope to have the thing all housed and some test footage up tomorrow, only if people are interested though. Glen, yeah it feels pretty good, at times i thought it was not going to work, but i JUST DID NOT want to use plastic, IT HAD TO BE GLASS!!! Im very happy, still ironing out my method to improve things. BTW, the glass is 1.5mm thick. I would like to thank Keith Wakeham for helping me with the technical side of the fan motor and also about power options, Greg Boston and Ben Winter for sujestions for centring the disk, Bill Porter and Glen Hurd for help and guidance of glass cutting and thanks for all else for moral support. Thanks, Wayne.

September 15th, 2005, 07:33 AM	#40
Glen Hurd Regular Crew Join Date: Jul 2005 Location: Burlington, NJ Posts: 59	Yeah, and who's going to NOT be interested in your test footage! :) Personally, I would look forward to people's test footage everyday, but that's just me. I'm just now discovering that there are a lot of things to discover regarding choice and placement of lenses for these systems (thanks, in part, to Wayne's pictures -- kinda got me off my a$$ and doing some experiments of my own). There also appear to be some subtle "gotchas," in there too. So here's to your first spinning glass disk, and to more samples of what it can do. (clink of glasses) G

September 15th, 2005, 08:21 AM	#41
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Ben, I have heard that the reddockmicro glass is not actually glass but a type of plastic, i could be wrong though. I also heard that the $25 replacement glass is only for customers that purchased the main unit. Again, correct me if im wrong, but thanks for pointing that out. Still adjusting the housing and that, but hope to have test footage up later. Thanks, Wayne.