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Equipment Discussions >> Equipment

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NicolasKL
member


Reged: 01/15/13

Loc: Reno, NV
Went to install FT focuser, head twisted off screw new
      #5952177 - 07/02/13 10:19 PM

The internal screw that holds the stop on the old focuser was on so tight that I twisted the head off trying to get it off.

Any ideas? I can drill it out I guess but I'm worried about both metal shavings and screwing up the threads, plus now I need a new screw and don't know the dimensions of it.


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mgwhittle
Pooh-Bah
*****

Reged: 08/24/11

Loc: Chattanooga, TN
Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5952309 - 07/02/13 11:45 PM

You should be able to use an extractor like the "ez out" or something similar to remove it with no damage to the threads. Might have to soak it with some penetrating oil like liquid wrench. You shouldn't have to drill it out so no shavings should get inside. If all this sounds too much, a machine shop should be able to get it out for a small fee.

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gnowellsct
Postmaster
*****

Reged: 06/24/09

Re: Went to install FT focuser, head twisted off screw new [Re: mgwhittle]
      #5952359 - 07/03/13 12:37 AM

Car mechanics are sometimes pretty good at getting out old screws, particularly in the NE and MW where cars rust.

You might consider getting stainless steel or nylon screws from McMaster Carr. To get the size of the screw you need a screw checker. you can buy them (they're handy to have at home) or you can take an intact screw to Home depot in the screws department there should be a screw checker hung up somewhere that you can use. GN


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n1wvet
super member
*****

Reged: 04/22/11

Loc: Northern Virginia, USA, Earth
Re: Went to install FT focuser, head twisted off screw [Re: gnowellsct]
      #5952387 - 07/03/13 01:08 AM

Any part of the screw body sticking out? Try Vice-grips after soaking with penetrating oil.

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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Went to install FT focuser, head twisted off screw new [Re: n1wvet]
      #5952675 - 07/03/13 08:25 AM

You screwed up the screw? That's pretty screwed up. If it's broken off inside and the threads go all the way thru the focuser, you could take the diagonal and all out of the focuser, point the scope to the zeinith and start screwing in another screw, if the screw hole is all the way thru, the new screw will thread the old screw all the way out (did that with one of the allen head screws on my Scopestuff focuser when installing the finderscope foot.). If it isn't, I'd find a machine shop/auto shop where they deal with this on a fairly regular basis (broken off screw heads, not astronomers).

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dawziecat
Carpal Tunnel
*****

Reged: 10/20/10

Loc: Rural Nova Scotia
Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5952739 - 07/03/13 09:11 AM

If you have a watch/clock/jewelry repair operation nearby, they might be able to do this. I just recently had a pair of eyeglases with broken screw. Walmart optical department and a dispensing optometrist were not able to help but a clock repair shop handled it easily in a few minutes while I waited. They charged me $5.00. Good luck.

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NicolasKL
member


Reged: 01/15/13

Loc: Reno, NV
Re: Went to install FT focuser, head twisted off screw new [Re: csrlice12]
      #5952747 - 07/03/13 09:16 AM

Should have mentioned, this is for a CPC-1100.

I'm going to see if they make an EZ out small enough, but I kinda doubt it, it's a pretty small screw.

A little bit of the screw is sticking out, but I really doubt it's enough to get a grip on with needle nose or vise grips, though I'll try that first.

May also try cutting a notch in it with a dremel and then using a standard screwdriver on it, but again I don't think enough of it is sticking out and unless I really loosened it up before I twisted the head off, I doubt it'll work.

Unless there's a properly sized EZ out that works better than I expect it to, I think drilling might be the only option, but maybe I could just drill out 1/4 of an inch of it or so and then buy a small screw. Not really sure how long the broken screw is though, for all I know it's only 1/4 of an inch itself.


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don clement
Vendor (Clement Focuser)


Reged: 02/02/11

Loc: Running Springs, California
Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5953023 - 07/03/13 12:20 PM


If the screw is in aluminum you might try using Alum to dissolve the screw.
http://www.homemodelenginemachinist.com/f25/dissolving-broken-tap-aluminum-br...

Don Clement


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oo_void
professor emeritus


Reged: 11/13/09

Loc: San Francisco, CA
Re: Went to install FT focuser, head twisted off screw new [Re: don clement]
      #5953508 - 07/03/13 05:19 PM

Same thing happened to me. I tried all the "home remedies" to no effect. Ended up buying something like this and it worked perfectly.

http://www.amazon.com/Alden-8530P-Grabit-Damaged-Remover/dp/B000ETLK7O/ref=sr...

Alden has numerous set sizes. Just find the one that's the right size for your needs.


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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Went to install FT focuser, head twisted off screw new [Re: oo_void]
      #5953536 - 07/03/13 05:37 PM

Take the focuser tube out of the focuser and see if the screw hole goes all the way thru (depends on the focuser). If it does just thread in another screw, it will force the old one out. Just be sure to keep the scope pointed up!

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starrancher
Carpal Tunnel
*****

Reged: 06/09/09

Loc: Northern Arizona
Re: Went to install FT focuser, head twisted off screw new [Re: csrlice12]
      #5953570 - 07/03/13 05:53 PM

Very possible you'd end up with a "cinch nut" situation in attempting that and causing damage to existing threading .

Edited by starrancher (07/03/13 05:57 PM)


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don clement
Vendor (Clement Focuser)


Reged: 02/02/11

Loc: Running Springs, California
Re: Went to install FT focuser, head twisted off screw new [Re: oo_void]
      #5953683 - 07/03/13 07:31 PM

Quote:


http://www.amazon.com/Alden-8530P-Grabit-Damaged-Remover/dp/B000ETLK7O/ref=sr...

Alden has numerous set sizes. Just find the one that's the right size for your needs.




+1 on the Grabit I have a set that works well.

The last resort is to take it to an EDM removal service such as : http://www.brokentap.com/services.html

Don Clement


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Goodchild
scholastic sledgehammer
*****

Reged: 12/31/08

Re: Went to install FT focuser, head twisted off screw new [Re: don clement]
      #5953707 - 07/03/13 07:48 PM

If it were me, I'd send it to SI and let them fix it. Not worth messing up a nice focuser trying a DYI approach. It doesn't sound like a simple fix.

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NicolasKL
member


Reged: 01/15/13

Loc: Reno, NV
Re: Went to install FT focuser, head twisted off screw new [Re: Goodchild]
      #5955540 - 07/05/13 02:28 AM

All taken care of. Tried the Grabit but just couldn't get it to bite, so I just drilled out the screw and tapped new threads in.

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NicolasKL
member


Reged: 01/15/13

Loc: Reno, NV
Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5955818 - 07/05/13 10:18 AM Attachment (8 downloads)

All ready to go, smooth as butter. Forecast is partly cloudy tonight, but if there's too many clouds tonight, rest of the weekend is supposed to be clear.

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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5955847 - 07/05/13 10:37 AM

a little off topic, but don't you just love those Baader quicklock adapters........

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Goodchild
scholastic sledgehammer
*****

Reged: 12/31/08

Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5955848 - 07/05/13 10:37 AM

I'm glad to hear you had a successful conclusion to your dilemma.

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tim57064
Pooh-Bah
*****

Reged: 08/23/12

Loc: Southeast South Dakota,USA
Re: Went to install FT focuser, head twisted off screw new [Re: NicolasKL]
      #5955851 - 07/05/13 10:38 AM

Quote:

All taken care of. Tried the Grabit but just couldn't get it to bite, so I just drilled out the screw and tapped new threads in.


How did you take care of the shavings problem? Hope that none got inside the tube.

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NicolasKL
member


Reged: 01/15/13

Loc: Reno, NV
Re: Went to install FT focuser, head twisted off screw new [Re: tim57064]
      #5955925 - 07/05/13 11:15 AM

Quote:

Quote:

All taken care of. Tried the Grabit but just couldn't get it to bite, so I just drilled out the screw and tapped new threads in.


How did you take care of the shavings problem? Hope that none got inside the tube.




I left the focuser in while I was drilling it out, so it caught everything. Then vacuumed everything thoroughly before I pulled the old focuser back off. Seems to have done the trick.


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NicolasKL
member


Reged: 01/15/13

Loc: Reno, NV
Re: Went to install FT focuser, head twisted off screw new [Re: csrlice12]
      #5955932 - 07/05/13 11:17 AM

Quote:

a little off topic, but don't you just love those Baader quicklock adapters........




Yep, I'm a big fan.


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