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Deforking and deweighting a Mak

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#1 rwiederrich

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Posted 14 September 2020 - 11:08 AM

Is anyone familiar with the process of deforking and adding a dovetail to a Mak?

 

Removal of the internal counterweights would be included in the process.

 

Anyone travel this road before?

 

Rob



#2 rwiederrich

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Posted 17 September 2020 - 03:20 PM

Well I got the Mak off the fork and began building the risers and the dovetail.

 

Here are some pics of the first riser and drilling and counter sinking it.

 

Rob

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#3 rwiederrich

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Posted 17 September 2020 - 03:23 PM

I bolted the risers where the 3 existing bolts are located...it appears they had anticipated this conversion.

 

Here are some pics of the second riser and the cross bar.

 

Rob

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#4 rwiederrich

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Posted 17 September 2020 - 03:24 PM

Nex up was to machine the dovetail...here it is being mocked up. Lots of cutting and milling to finish this up.

 

Rob



#5 rwiederrich

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Posted 17 September 2020 - 03:24 PM

Nex up was to machine the dovetail...here it is being mocked up. Lots of cutting and milling to finish this up.

 

Rob

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#6 rwiederrich

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Posted 17 September 2020 - 03:26 PM

Here it is all put together.  I calculated for the removal of the internal counterweight...so currently we're back heavy.

 

Rob

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#7 rwiederrich

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Posted 17 September 2020 - 03:31 PM

I have temporarily mounted my little Gem to the old Meade tripod.....I still have to disassemble it again and remove the counterweight(Still haven't figured that out quite right).... I will also remove the new riser/dovetail from the scope and paint it to complete the job.   Si figured it out and made my own risers and dovetail.....not to mention repurposed the tripod.

 

If anyone has any experience removing the counterweight...PIPE in.

 

I will either be selling the fork and wedge, or just scrapping them for spare parts and material.

 

Thanks for watching.

 

Rob

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#8 rwiederrich

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Posted 17 September 2020 - 03:35 PM

Poor old fork.......

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#9 LU1AR

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Posted 17 September 2020 - 05:10 PM

I bought a very cheap ETX 90 with a ruined mount (Leaked batteries and broken gears). After trying to fix it, I decided to take advantage of the great OTA and mount it on an EQ2.
I am happy with the change.
Edgardo

 

 

 

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#10 John Rose

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Posted 17 September 2020 - 06:11 PM

I believe there is an article on Astromart several years ago on removing the counterweight. It is not for the faint of heart!

 

John Rose



#11 rwiederrich

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Posted 17 September 2020 - 06:39 PM

I believe there is an article on Astromart several years ago on removing the counterweight. It is not for the faint of heart!

 

John Rose

I'm having a fit over it right now.  Got the corrector out and the primary(Not to mention the tricky keeper ring)...but that dang weight is glued in there for sure.........

 

What to do....?

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#12 rwiederrich

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Posted 17 September 2020 - 07:35 PM

Well I popped the weight right out.  Just applied a small crowbar inside the OTA under the weight and the back plate by the focused knob hole .  Just a lot of pressure and it released and pooped off .  Yeah it was stressful and required lots of pressure .   She’s done.  Now time for reassembly.


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#13 Augustus

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Posted 17 September 2020 - 08:07 PM

Just an FYI: that f/6.3 reducer will not work well on that scope.



#14 rwiederrich

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Posted 17 September 2020 - 08:33 PM

Just an FYI: that f/6.3 reducer will not work well on that scope.

Well it came with it.  What do you suggest?



#15 rwiederrich

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Posted 17 September 2020 - 08:45 PM

I believe there is an article on Astromart several years ago on removing the counterweight. It is not for the faint of heart!

 

John Rose

I did it. 



#16 rwiederrich

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Posted 18 September 2020 - 10:51 AM

Got the weight out and put her back together...boy oh boy is she light now.  Makes for great balancing.

 

Here is a pic of the back plate without the weight.

 

Rob

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#17 Augustus

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Posted 18 September 2020 - 12:42 PM

Well it came with it.  What do you suggest?

2" diagonal.



#18 rwiederrich

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Posted 18 September 2020 - 03:26 PM

W

 

2" diagonal.

What exactly does the focal reducer actually do?  Will the scope work correctly without one?  Why is the f/6.3 not acceptable?  It appears to work very nicely from what I can see.

 

Rob(Newby to Mak's


Edited by rwiederrich, 18 September 2020 - 03:27 PM.


#19 jgraham

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Posted 18 September 2020 - 11:49 PM

You can try the focal reducer and see for yourself if it meets your needs. I leave my Mak 7 in its native focal length as it gives sharp, high contrast views. To go wide I like to use long focal length eyepieces like the 56mm Super Plossl or a modern UWA like the Meade 32mm. My trusty 2" Meade 26mm QX gets the most use.

Congratulations on popping out the weight, and enjoy your new scope!

#20 rwiederrich

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Posted 21 September 2020 - 11:39 AM

I will try it with and without the focal reducer. I got a 40mm plossl with the scope but the lens elements came loose inside and slide back and forth within the barrel...the views are crummy with it and there is a central obstruction...…

I'll keep working at it.

Thanks for the encouragement.

Rob

#21 jgraham

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Posted 21 September 2020 - 07:51 PM

The Mak 7 has the best optics that I have seen in a consumer scope. It gives a sharp, flat, high contrast image perfect for lunar, planetary, and most deepsky objects. As I mentioned, I really like my trusty old 2” 26mm QX, but the long focal length and flat field makes it very forgiving with long focal length eyepieces like the 56mm Super Plossl. I also have a set of the massive Ultrawide Angle eyepieces, but the much lighter Super Wides and Plossls work fine. Once I got used to it I thoroughly enjoy using the Mak 7 in its native focal length. Trying to push it too wide brightens the field and reduces the contrast. However, it never hurts to experiment and see what works well for you.

 

Enjoy!



#22 rwiederrich

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Posted 22 September 2020 - 11:23 AM

The Mak 7 has the best optics that I have seen in a consumer scope. It gives a sharp, flat, high contrast image perfect for lunar, planetary, and most deepsky objects. As I mentioned, I really like my trusty old 2” 26mm QX, but the long focal length and flat field makes it very forgiving with long focal length eyepieces like the 56mm Super Plossl. I also have a set of the massive Ultrawide Angle eyepieces, but the much lighter Super Wides and Plossls work fine. Once I got used to it I thoroughly enjoy using the Mak 7 in its native focal length. Trying to push it too wide brightens the field and reduces the contrast. However, it never hurts to experiment and see what works well for you.
 
Enjoy!



I wondered why the previous owner used the focal reducer? I use simple Plossl's with all my long focus refractors...and I would assume they would work with this Mak at designed focal length of f/15.

It works well with the focal reducer too....but I'm sure I am losing some contrast and possibly resolution.

Rob


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