desertstars
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Reged: 11/05/03
Posts: 34596
Loc: Tucson, AZ
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Have any of you used something like this stuff ( Adhesive backed PTFE ) to replace the felt-like material often used to line tube rings? I'd be curious to see what you thought of the results.
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Tom W.
Collinder's Catalog
Jewels in Dark Settings
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peter k
super member
Reged: 02/03/07
Posts: 172
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I just ordered some to line the tube rings on my 6" newt, will report on effectiveness.
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desertstars
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Reged: 11/05/03
Posts: 34596
Loc: Tucson, AZ
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 Looking forward to hearing how that works.
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Tom W.
Collinder's Catalog
Jewels in Dark Settings
Edited by desertstars (10/21/09 11:06 PM)
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timo4352
super member
Reged: 04/16/07
Posts: 160
Loc: Northeast Ohio
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I've done this on a few scopes that I've owned. I used UHMW and added a Wilcox ring for tube rotation on a Dob and EQ mounted Newt. Worked very well for me. McMaster Carr has the stuff in different thickness and widths. They sell a nice large diameter hose clamp and tubing for the ring too.
Tim
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Orion 3.6CA Reflector
and 2 homebrew scopes --
8" Hubble Bubble ballscope
8" F/8 CHief - nearing completion 
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desertstars
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Reged: 11/05/03
Posts: 34596
Loc: Tucson, AZ
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UHMW... thats a new one on me. Looked it up, and it does look very promising.
I have a third tube ring to serve the purpose of a Wilcox ring (a friend and I split a set for this purpose shortly before Erik published the idea). I've gotten along well enough with the "felt" in the rings, but it has been slowly breaking down and now is beginning to scuff the OTA.
Appreciate hearing about this other option.
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Tom W.
Collinder's Catalog
Jewels in Dark Settings
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desertstars
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Reged: 11/05/03
Posts: 34596
Loc: Tucson, AZ
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Finally got around to cleaning the felt and its adhesive off the rings, and replaced the felt with a tape made of the UHMW material recommended by Tim. The OTA rotates quite a bit more smoothly with this stuff than it did with the original felt. So far, so good.
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Tom W.
Collinder's Catalog
Jewels in Dark Settings
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Bob Myler
sage
Reged: 05/18/06
Posts: 224
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What's a "Wilcox Ring"?
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timo4352
super member
Reged: 04/16/07
Posts: 160
Loc: Northeast Ohio
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http://www.andysshotglass.com/wilcox_rotating_rings.html
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Orion 3.6CA Reflector
and 2 homebrew scopes --
8" Hubble Bubble ballscope
8" F/8 CHief - nearing completion
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Bob Myler
sage
Reged: 05/18/06
Posts: 224
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Thanks, Tim. What a great idea!
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DCS357
member
Reged: 10/20/08
Posts: 29
Loc: Lubbock, Tx
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Tom,
Did you get the tape from McMaster-Carr? If so do you have their part number? I am looking at item # 7344A41 0.022" thick by 1" wide. UHMW Polyethylene Tape with Super-Bond Adhesive.
thanks
don c
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Astro-Tech AT8IN F/4 Imager
Celestron Omni XLT 120
CG-5ASGT, CG-4 mount, Voyager Alt-z
GSO Crayford focuser
Orion 100mm f\6
Hyperion 17, 8-24 Zoom
Canon 450Xsi
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desertstars
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Reged: 11/05/03
Posts: 34596
Loc: Tucson, AZ
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Don
That's what I ordered from them. It ended up being almost exactly the same thickeness as the original felt. It was easily cut with an ordinary pair of scissors and was no problem to apply.
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Tom W.
Collinder's Catalog
Jewels in Dark Settings
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Doug Reilly
super member
Reged: 07/29/08
Posts: 158
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I'd be curious about any impact in settling time after the scope gets bumped. Does the felt absorb vibration any better than the plastic pads?
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I keep a blog on astronomy, astronomy outreach, and other related topics at punkastronomy.com Nerd is punk!
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DCS357
member
Reged: 10/20/08
Posts: 29
Loc: Lubbock, Tx
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Thanks Tom
will order now and try it.
don c
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Astro-Tech AT8IN F/4 Imager
Celestron Omni XLT 120
CG-5ASGT, CG-4 mount, Voyager Alt-z
GSO Crayford focuser
Orion 100mm f\6
Hyperion 17, 8-24 Zoom
Canon 450Xsi
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desertstars
Please stand by...
Reged: 11/05/03
Posts: 34596
Loc: Tucson, AZ
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Quote:
I'd be curious about any impact in settling time after the scope gets bumped. Does the felt absorb vibration any better than the plastic pads?
Not that I noticed from one time out. The only change I could detect was a decrease in resistance to movement when I rotated the OTA - which is of course what I was after. Vibration settling time seemed unchanged, as far as I could tell (I certainly didn't experience an "Uh, oh!" moment in that regard) but to be honest it did not occur to me to actually check for a difference.
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Tom W.
Collinder's Catalog
Jewels in Dark Settings
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