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Need help w/Teflon Sizes & PTFE vs. UHMW

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#1 skysoldier173abn

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Posted 11 September 2019 - 10:51 AM

Trying to take the slop out of plastic Orion Focusser for XT6 and Also needs appropriate size for 4.5” Dob Alt-Az Bearings. Home Depot and Ace looked at me funny when I asked for strips or sheets of Teflon then directed me all over on a search for nothing 😤

Amazon markets different sizes of Teflon or UHMW. Which material should I use? At what thickness for the Alt/Az bearings for 4.5” Dob base?

what size for focusser drawtube? I guess I could disassemble the focusser and measure the strip with calipers or the gap. Honestly I don’t want to fudge the numbers up and order the wrong stuff. Any help or info is appreciated.



#2 GDAstrola

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Posted 11 September 2019 - 11:25 AM

When you are ready to buy take a look at the following for Teflon/PTFE and UHMW products.

 

https://www.mcmaster...ethylene-sheets


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#3 skysoldier173abn

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Posted 11 September 2019 - 04:58 PM

Thanks for the link. I’m trying to find info to suit my needs. I’ll keep digging. If anybody knows of a post to read or a link to follow I would surely appreciate the help.



#4 Jon Isaacs

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Posted 11 September 2019 - 11:49 PM

For the focuser I use 0 015" Teflon that's etched on one side so it's bondable.

 

Jon


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#5 skysoldier173abn

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Posted 12 September 2019 - 07:49 AM

Beautiful Jon! Thanks for the tip . 



#6 Jon Isaacs

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Posted 12 September 2019 - 08:30 AM

Beautiful Jon! Thanks for the tip . 

PM Sent

 

Jon



#7 skysoldier173abn

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Posted 12 September 2019 - 11:48 AM

Found the dimensions for Alt-Az bearings for Dob Mount.
Stellafane.org has the resources you need to construct a Dobsonian Mount simply and effectively.

#8 skysoldier173abn

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Posted 14 September 2019 - 09:46 PM

Slop is taken care of! Shimmed with Teflon strips. Thanks Jon!




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