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6" refractor mount refurbish after 20yrs

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36 replies to this topic

#26 Kasmos

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Posted 11 January 2021 - 05:50 PM

Excellent and inspiring work!

Many of us dream of such a nice 6". Hopefully you'll now use it.



#27 Terra Nova

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Posted 11 January 2021 - 07:46 PM

You wound up with an absolute lovely, very classic heavy-duty GEM, well worth the time and effort you put into it! Wow! Just wonderful work!



#28 dave brock

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Posted 11 January 2021 - 11:04 PM

Thanks Paul, Charlie, Kasmos and Terra.


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#29 Dave Trott

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Posted 11 January 2021 - 11:08 PM

Superb work, Dave! Your use of a router as a substitute for a milling machine and rotating table is particularly spectacular!


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#30 dave brock

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Posted 12 January 2021 - 12:01 AM

Thanks Dave. We do what we can. I'm very fortunate to have a Joinery factory at my disposal.smile.gif



#31 dave brock

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Posted 12 January 2021 - 12:12 AM

I used two of these brass cabinet door knobs on the rings.

 

knob 1.jpg

 

Drilled and tapped the hole to suit the M8 bolt then used that to mount it in my drill press. Put a 10mm high speed drill bit

into a drill press vice which was bolted to the drill table and used the drill press as a lathe to change the knob's shape. Held a

hack saw to make the grooves while it was spinning and then sanded and polished.

All the polished brass items have been clear lacquered btw.

 

Edit: Most machinists will warn not to do what I did as the drill collet is likely to fall out but I went slow. No problems

 

One of the finished knobs. 

 

knob 2.jpg


Edited by dave brock, 12 January 2021 - 12:17 AM.

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#32 dave brock

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Posted 12 January 2021 - 01:01 AM

Maybe a lamp post base? It looks like there is a cutout for a wire to come out of the base and go into the ground, with some sort of cover bolted over it. 

 

The rings turned out very nicely!

 

I'm curious about the router bit(s) you were using to mill the aluminum. I'd be afraid to ruin any of my good woodworking bits. Was it a carbide bit, or just steel? What size?

 

Also, what grade of aluminum? 6061? 5052? Did you have to do anything special to cool the bit? Change the speed of the router?

 

Chip W. 

Sorry Chip, I missed these questions. I did spray occasionally with CRC but used the router at maximum speed, which is 

what it is always used at for my job.



#33 Joe Bergeron

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Posted 12 January 2021 - 01:52 AM

Wow. If any other tube rings have ever been made using your exact method, I’d be surprised. Ingenious. 
 

By the way, I have visited Hamilton a few times and always thought it was an attractive city. 



#34 dave brock

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Posted 12 January 2021 - 01:59 AM

Thanks Joe. While I like Hamilton it has a bit of a reputation amongst NZrs as boring so I hate to think how it compares to NY

Edit: Oops I see Upstate NY is not NY City.


Edited by dave brock, 12 January 2021 - 05:06 AM.

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#35 SteveGR

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Posted 13 January 2021 - 01:57 PM

You really brought that to life and made it look beautiful.

 

I think that pier is the kind of "whatever I have lying around" school of work that my Grandfather was a master of.  smile.gif

 

Do you know the age of the scope?



#36 dave brock

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Posted 13 January 2021 - 03:04 PM

Thanks Steve. The scope itself is around 1900. It is a Watson "Century". The mount don't know but

suspect 1930-50.

 

IMG_1890 sm.jpg


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#37 CeeKay

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Posted 13 January 2021 - 09:32 PM

Beautiful work, Dave!

 

Chris




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