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Flocking Advice

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#1 H-Alfa

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Posted 26 June 2019 - 11:19 AM

Hello,

 

I’m just preparing my refractor to be flocked and I have some questions regarding the process as is the first time that I’m doing this.

 

The flocking material that I’ve bought is the D-Fix Black Velvet, that is cheaper (and easier for me to buy it locally) than the Protostar one.
I found a comparison of this two materials (for other applications) and seems that they are really close in terms of reflectivity.
http://projectiondre...-velvet-devore/

 

My concern is about how to manipulate it. The first thing that I did when I bought it is to touch the surface looking for flocking looses… and it looses…I’m really concerned about this because I don’t want to change my reflections issues (that are not so harmful) with flocking motes flying all around the scope.

 

As far as I know about the flocking process, flock losses are unavoidable, but I work on the packaging industry, so maybe there are better industrial processes that can fix this issue.
So my question is… the “astronomical” flocking materials are really better regarding this subject? Are they specially “clean”?

 

For now, I plan to cut the pieces and then clean them with a vacuum cleaner.
I understand that even in a material that doesn’t loose by itself, once cut, there will be some particles, so how did you faced this problem also?

 

Thank you in advance.



#2 Mike G.

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Posted 26 June 2019 - 11:28 AM

I can recommend both the Protostar and the Scopestuff adhesive backed flocking material.  I have used both extensively and neither one has much fiber loss.  you will always have some, but with either of these it won't be anything that you will need to be concerned about.  personally, I would not attempt to flock any tube using a manual gluing situation.  too messy and the edges will be quite difficult to get smooth.  cut thin strips and take your time.



#3 H-Alfa

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Posted 26 June 2019 - 12:06 PM

Ok, so as I understand, even astronomical flocking brands have some looses...

Regarding your advice, thank you, but take into account that the D-fix is adhesive also, so no additional glue is involved in the process.
My first try will be to cut entire pieces, but in case to not to be successful I will try strips as you recommend.

Enviado desde mi MI 5X mediante Tapatalk

Edited by H-Alfa, 26 June 2019 - 12:06 PM.


#4 photomagica

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Posted 26 June 2019 - 01:24 PM

After I apply flocking I go over it with a vacuum cleaner. That removes almost all the loose material as well as any lint and dust that has accumulated. There is always some material that is loosened by manipulation of the flocking material and the cut edges. The vacuum takes care of that and more. Use gentle suction to just pick up the loose material - not enough to aggressively pull the flocking off the backing.

Bill


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#5 H-Alfa

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Posted 26 June 2019 - 04:10 PM

After I apply flocking I go over it with a vacuum cleaner. That removes almost all the loose material as well as any lint and dust that has accumulated. There is always some material that is loosened by manipulation of the flocking material and the cut edges. The vacuum takes care of that and more. Use gentle suction to just pick up the loose material - not enough to aggressively pull the flocking off the backing.
Bill

Ok. Thank, you!
About the use of the vacuum cleaner I'm a little bit concerned about to hit the flock and make it shiny (I'm not sure if I explained correctly). Any advice?

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#6 H-Alfa

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Posted 27 June 2019 - 01:46 AM

I reply to myself, I will flock the end of the vacuum cleaner.

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#7 photomagica

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Posted 27 June 2019 - 02:12 AM

About hitting the flocking with the vacuum and making it shiny, actually the vacuuming will raise the pile and make the flocking more uniformly black. If you have any doubts about how it will work with your material, try vacuuming a sample of the flocking material before you install it.

 

If you have a tiny enough brush for the end of the vacuum, that may help as well, though I just use the end of the hose or the crevice tool, which is a bit narrower.

Bill


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#8 H-Alfa

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Posted 27 June 2019 - 03:29 AM

Hello Bill,

Thank you. Yes, I will try what you suggest.

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#9 GlenM

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Posted 27 June 2019 - 09:39 AM

Flockboard is amazing stuff. Getting hold of it is another matter entirely.

 

Glen.



#10 H-Alfa

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Posted 26 July 2019 - 10:10 AM

Hello,

 

I would like to update this thread showing the result of the flocking procedure, but first, thank you for the suggestions. they helped me a lot and the process has been far more easy than I expected! smile.gif I wrote an article with all the deatils that can be found in my website:

 

https://aiastro.word...scope-flocking/

 

At a glance, Here you can see the modification planning:

 

image-15.png?w=1000

 

 

Here are some images of the result:

 

img_20190705_170148.jpg?w=1000

 

img_20190704_194546.jpg?w=1000

 

img_20190705_162419.jpg?w=495&h=660

 

 

...and this is a comparison before/after looking through the optical system with the camera removed, and with the flat panel attached.

 

beforevsafter-1.jpg

and the corresponding flats of the Ha filter in a normal operation. Left is the Masterflat taken this winter, before flocking, and the right one is after flocking:

 

image-17.png?w=1000

 

Apart of the new dust motes, there no noticeable improvement. Maybe I have to check it over the field and see if my typtcal issues with gradients have gone... or maybe flocking doesn't improve nothing in my optical system.

 

Clear skies!

 

Alberto.


Edited by H-Alfa, 26 July 2019 - 10:11 AM.

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#11 photomagica

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Posted 26 July 2019 - 09:51 PM

Flocking is unlikely to improve gradients very much. It will improve contrast, because it reduces flare, sometimes rather dramatically. The extent of the improvement depends a great deal on the type of object being viewed.

Bill



#12 luxo II

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Posted 27 July 2019 - 05:00 AM

The killer test IMO is to observe something very close to the lunar limb - without the moon in the field of view, but close enough that the light from the moon will be falling on the flocking.



#13 H-Alfa

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Posted 27 July 2019 - 10:22 AM

Hi, Thank you for the suggestions.

I will try to shoot very close to the moon and see how it performs.

Unfortunatelly I haven't done this before flocking, so no comparison will be possible.


Edited by H-Alfa, 27 July 2019 - 10:22 AM.


#14 photomagica

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Posted 27 July 2019 - 06:18 PM

BTW - congratulations on doing a really excellent flocking job!

Bill


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