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fixing plastic newton focuser base broke off

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28 replies to this topic

#1 greenglass

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Posted 22 February 2020 - 01:08 PM

any ideas to put a base on this?

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#2 DLuders

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Posted 22 February 2020 - 01:22 PM

You could incrementally create a new base by using JB Weld epoxy.  Build up several layers, a day at a time, to conform to the curved telescope tube.  The color of JB Weld is close to what you have too!  smile.gif  



#3 wrnchhead

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Posted 22 February 2020 - 01:29 PM

Not sure what the other side of the base looks like, but if it isn’t a critical collectors item, Surplus Shed and other sources could replace your whole focuser for $25 probably unless you wanted to upgrade.
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#4 wrnchhead

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Posted 22 February 2020 - 01:32 PM

You could incrementally create a new base by using JB Weld epoxy.  Build up several layers, a day at a time, to conform to the curved telescope tube.  The color of JB Weld is close to what you have too!  smile.gif  

I would pay good money to see someone actually do this. I guess anything is possible with $50 worth of JB Weld!


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#5 Benach

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Posted 22 February 2020 - 01:46 PM

RSXRSXJORT0jBHFce9D5JucpPCwdh0HjtZaxuD1t


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#6 N3p

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Posted 22 February 2020 - 02:01 PM

RSXRSXJORT0jBHFce9D5JucpPCwdh0HjtZaxuD1t

hahahahah :p
 


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#7 Zwick

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Posted 22 February 2020 - 05:48 PM

Have a friend with 3d printing capabilities? Shouldn't be too hard to model a copy of the broken original and print it. Actually depending on your location, Libraries or commercial operations may be able to do the print. You would just have to take careful measurements of the broken part and do the Computer Aided Design work (or find someone who could). Several decent free CAD programs are available.



#8 Ken Watts

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Posted 22 February 2020 - 06:14 PM

I shortened a newtonian plastic focuser and determined it was ABS. I used ABS cement (solvent)and had perfect joints.  Worth a try.



#9 Garyth64

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Posted 22 February 2020 - 06:55 PM

Just pick up one from another unused scope.  It will be must easier in the long run.

 

What size tube is it for?  Maybe someone has something you can use in their parts boxes.


Edited by Garyth64, 22 February 2020 - 06:57 PM.

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#10 Pinbout

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Posted 22 February 2020 - 08:04 PM

that is beyond fixing or the cost for a new $15 used focuser.


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#11 Sully606

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Posted 22 February 2020 - 08:20 PM

https://telescope-wa...h-125-metal-top
 

Will this work?



#12 Pinbout

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Posted 22 February 2020 - 08:24 PM

if he cut off the base and squared his off, he could probably glue it to his old focuser... lol.gif foreheadslap.gif


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#13 Jon Isaacs

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Posted 22 February 2020 - 09:42 PM

Knowing more about the scope, more about the focuser would be helpful.  I am seeing Orbitor in the first image and 76mm as the aperture and X00mm for the focal length, maybe it's a 76 mm Newtonian with a 700mm focal length, that's pretty common.  Is the focuser 1.25 inch or 0.965 inch?

 

Plastic focusers are generally inexpensive, replacing it would be the best way to go if it were affordable and a focuser could be found.  

 

Otherwise, it might be possible to glue the focuser back together, depending on the material.  

 

Jon



#14 greenglass

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Posted 22 February 2020 - 09:54 PM

the tube is 4.75 '' diameter.

i like the JB weld bond idea but not cheap.  

how about 3 angle irons screwed to the draw tube?



#15 Jon Isaacs

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Posted 22 February 2020 - 10:22 PM

i like the JB weld bond idea but not cheap.

 

If the JB Weld is compatible with the focuser material, just glue it back together and be done with it.  

 

JB weld is just epoxy so there may be other material specific adhesives that are a better fit.   

 

Jon



#16 iwannabswiss

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Posted 22 February 2020 - 11:50 PM

Find someone with a 3D printer.



#17 Garyth64

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Posted 23 February 2020 - 08:14 AM

Can we get a photo of the name plate on the focuser?

 

Do you have the other section?  You didn't say.


Edited by Garyth64, 23 February 2020 - 08:15 AM.

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#18 dogbiscuit

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Posted 23 February 2020 - 11:03 AM

I have successfully "welded" broken ABS parts using a soldering iron and 3d printer ABS filament or waste material from ABS printed parts for filler material.

Fit the pieces together and clamp them.  Tack a several places around to hold alignment then go around with more penetration to get good depth of the weld. Build up a little on the surface and sand to pretty it up.


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#19 Pinbout

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Posted 23 February 2020 - 11:25 AM

I have successfully "welded" broken ABS parts using a soldering iron and 3d printer ABS filament or waste material from ABS printed parts for filler material.

Fit the pieces together and clamp them.  Tack a several places around to hold alignment then go around with more penetration to get good depth of the weld. Build up a little on the surface and sand to pretty it up.

Thermo forming - yes

 

Thermo setting - no 



#20 greenglass

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Posted 23 February 2020 - 04:33 PM

here's the label of the beast.  the plastic looks like bakelite.  the 3/4 inch secondary had a steel clip which rusted and stained that part of the mirror. i replaced it with a copper one.

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Edited by greenglass, 23 February 2020 - 04:34 PM.


#21 greenglass

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Posted 23 February 2020 - 04:41 PM

missing most of the flange , i have 5 pieces of it. so gluing it together wont help.



#22 wrnchhead

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Posted 23 February 2020 - 05:04 PM

https://www.surpluss...tem/L14818.html

Really reminds me of this focuser. Unfortunately, out of stock. I don’t know how handy you are or how much money you want to spend on that scope because I also see it listed at Goodwill for $20 in Texas but you might consider replacing the whole scope at this point.

#23 steveastrouk

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Posted 24 February 2020 - 09:43 AM

https://www.surpluss...item/L3630.html



#24 ww321q

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Posted 24 February 2020 - 10:52 AM

If you want to fix it and not replace it you could maybe start with a piece of 4" abs pipe cut out to the right size. then glue the two pieces together. Or
https://www.surpluss...tem/L14818.html


Edited by ww321q, 24 February 2020 - 11:01 AM.


#25 ww321q

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Posted 24 February 2020 - 11:36 AM

That looks like the same one on my Bushnell 




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