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hardin 6" dob ?

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#1 Guest_**DONOTDELETE**_*

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Posted 17 February 2004 - 09:27 PM

How do I pull the primary mirror out of the scope so that I may center spot it for collimation purposes. Once again it is a Hardin 6" reflector. Anyone have any ideas. :question:

#2 jrcrilly

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Posted 17 February 2004 - 09:41 PM

Hi, Shorty.

I haven't seen the Hardin but the norm is to have a group of four screws going through the tube wall into the edge of the mirror cell. They'll be an inch or two in from the bottom of the tube. Removing all four permits the removal of the cell and mirror assembly.

#3 Guest_**DONOTDELETE**_*

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Posted 17 February 2004 - 10:31 PM

Tom,

My Hardin 8" has six screws attached to the outside of the tube which you undo. You could try standing the tube up and removing these screws so that the mirror cell doesn't fall out on anything. However, if your scope is anything like mine, the mirror cell was wedged in really tight. I used a hair dryer to heat and expand the tube. While it was still hot, I yanked the mirror out (after a few gentle taps with a mallet). Hopefully, you won't need to go through this.

Another tip is to wear latex gloves when center spotting the mirror. That way, if you accidentally touch the mirror you don't leave smudgy fingerprints.

Good luck!


#4 Harvest Moon

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Posted 18 February 2004 - 07:01 PM

I removed the screws then used my plastic level and a hammer to tap the mirror cell out of the tube. I broke my level using it as a buffer to put the mirror back in. Tom L used a rubber mallet.

#5 Tom L

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Posted 18 February 2004 - 09:19 PM

Carolyn! You're not supposed to break the level!

#6 Harvest Moon

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Posted 18 February 2004 - 10:25 PM

Cheap plastic level. I didn't have anything else to use that wouldn't chip the surface. It worked. I need a new level anyway, which is a good excuse to look at all of the tools that I don't know how to use but wish I did.

I can't afford to get into wood work.

#7 Tom L

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Posted 18 February 2004 - 10:51 PM

You think astronomy is expensive...go buy a power tool or 5!


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