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Equipment Discussions >> Equipment

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kind
member


Reged: 07/07/13

Re: Degree Circles new [Re: Steve OK]
      #6056423 - 08/31/13 05:13 PM

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tag1260
scholastic sledgehammer
*****

Reged: 10/07/12

Loc: Ohio, USA
Re: Degree Circles new [Re: Steve OK]
      #6056426 - 08/31/13 05:14 PM

Here's what I'm gonna try. I'll sight in on Polaris. Zero my Wixey. Get the Altitude for it from my software and drop down to that negative measurement on my Wixey, then zero it again and it should be good to go. I think it sounds more complicated than it would be to do.

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Steve OK
scholastic sledgehammer


Reged: 09/22/07

Loc: OKC, OK
Re: Degree Circles new [Re: tag1260]
      #6057181 - 09/01/13 06:58 AM

Brilliant!

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Steve OK
scholastic sledgehammer


Reged: 09/22/07

Loc: OKC, OK
Re: Degree Circles new [Re: Steve OK]
      #6063044 - 09/04/13 05:07 PM Attachment (53 downloads)

Here is an azimuth circle I made for my 17.5" Dob. I made a ring by laminating two layers of formica together. The printed scale is glued to the ring, and coated with clear acrylic spray. The ring is a semi-snug slip-fit around the ground board. You can move it relative to the ground board to set the azimuth, then it stays put quite well. There are three little tabs attached to the undersurface of the ground board to keep the ring from sliding down and off. The indicator is a strip of heat-formed Plexiglas, with a blackened scratch on the back. The scale is so big, I will be able to read it from the front of the scope...maybe.

Steve


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Steve OK
scholastic sledgehammer


Reged: 09/22/07

Loc: OKC, OK
Re: Degree Circles new [Re: Steve OK]
      #6063047 - 09/04/13 05:08 PM Attachment (38 downloads)

Pic #2

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Steve OK
scholastic sledgehammer


Reged: 09/22/07

Loc: OKC, OK
Re: Degree Circles new [Re: Steve OK]
      #6063048 - 09/04/13 05:08 PM Attachment (31 downloads)

Pic #3

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stargazer424
sage


Reged: 10/03/05

Loc: Central NJ
Re: Degree Circles new [Re: Steve OK]
      #6083584 - 09/16/13 10:17 AM

I just occurred to me that I didn't report on my successful use of my degree circle! Last week (night of the LADEE launch) I took my telescope to a semi-dark site. Using the degree circle I was able to find:
M11 - Wild Duck Cluster
M20 - Trifid Nebula
M22 - Globular Cluster
M25 - Open Cluster
M17 - Omega Nebula
M31 - Andromeda Galaxy
M71 - Globular Cluster
M27 - Dumbell Nebula
M57 - Ring Nebula
Uranus - First time!

Looking forward to more and more finds.


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donnie3
Carpal Tunnel


Reged: 12/15/04

Loc: bartlesville oklahoma
Re: Degree Circles new [Re: SkyArcher]
      #6084609 - 09/16/13 07:59 PM Attachment (37 downloads)

well, I printed out my azimuth circle, went to staples and had them to resize and laminate it. went to lowes and bought a 1/4 thick plywood board and cut a circle to fit the azimuth circle, glued it on. its cw so its attached to the center bolt now all I need is a pointer. thank you for all the help, would not have had the know how without you.donnie

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donnie3
Carpal Tunnel


Reged: 12/15/04

Loc: bartlesville oklahoma
Re: Degree Circles new [Re: donnie3]
      #6084612 - 09/16/13 08:00 PM Attachment (27 downloads)

another photo.

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schang
scholastic sledgehammer


Reged: 04/24/13

Loc: columbia, sc
Re: Degree Circles new [Re: donnie3]
      #6084749 - 09/16/13 09:02 PM

Donnie:

The way you put this degree circles puzzled me. Unless this 1/4" plywood board does not rotate with the scope, you will have a hard time to find a place to put the pointer on.


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csa/montana
Den Mama
*****

Reged: 05/14/05

Loc: montana
Re: Degree Circles new [Re: stargazer424]
      #6084760 - 09/16/13 09:09 PM

Dan, excellent job, thanks for the pictures! Also, Congratulations on an impressive list of targets you successfully found with the degree circles!

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csa/montana
Den Mama
*****

Reged: 05/14/05

Loc: montana
Re: Degree Circles new [Re: schang]
      #6084765 - 09/16/13 09:11 PM

Quote:

Donnie:

The way you put this degree circles puzzled me. Unless this 1/4" plywood board does not rotate with the scope, you will have a hard time to find a place to put the pointer on.




I agree, plus it looks like it will be very difficult to view while observing.


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donnie3
Carpal Tunnel


Reged: 12/15/04

Loc: bartlesville oklahoma
Re: Degree Circles new [Re: csa/montana]
      #6084797 - 09/16/13 09:32 PM

schang, the holding bolt is securely attached to the ground board with a t nut pressed into the top of the ground board then the bolt with a washer on it is screwed into the t nut form the bottom of the ground board. so the bolt is stationary. there is a lock nut on top of the base holding the two together. placing a washer on top of that then the azimuth circle then another washer then a wing nut so when moving the dob in azimuth the circle does not move with it. when setting, I just loosen the wing nut and turn the circle. donnie

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donnie3
Carpal Tunnel


Reged: 12/15/04

Loc: bartlesville oklahoma
Re: Degree Circles new [Re: donnie3]
      #6084817 - 09/16/13 09:43 PM

I will probably run a board across the back of the dob base and make a black line in the center like tom Andrews on page 25. donnie

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schang
scholastic sledgehammer


Reged: 04/24/13

Loc: columbia, sc
Re: Degree Circles new [Re: donnie3]
      #6085828 - 09/17/13 12:05 PM

As long as this Az degrees circle does not move when you turn the scope, then the pointer can be mounted in a location that you can easily see, without being blocked by the bottom of the scope at various alt angles.

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Gastrol
Pooh-Bah


Reged: 11/04/11

Loc: los angeles
Re: Degree Circles new [Re: schang]
      #6085876 - 09/17/13 12:28 PM Attachment (22 downloads)

Donnie's method allows him to place the pointer anywhere where it's easy to view. The most obvious place would be at the rear. A small block of wood with a fine finishing nail can be used for the pointer, for instance. This pointer will 'revolve' around the stationary degree circle as you turn the scope.
This method is no different from attaching the degree circle to the ground board and making a cutout on the upper board.


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schang
scholastic sledgehammer


Reged: 04/24/13

Loc: columbia, sc
Re: Degree Circles new [Re: Gastrol]
      #6085963 - 09/17/13 01:03 PM

In your drawing, the bottom of the scope is a lot of higher than it is, at least on my scope, which blocks part of the circle at various alt angles.

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Gastrol
Pooh-Bah


Reged: 11/04/11

Loc: los angeles
Re: Degree Circles new [Re: schang]
      #6085985 - 09/17/13 01:13 PM

Quote:

In your drawing, the bottom of the scope is a lot of higher than it is, at least on my scope, which blocks part of the circle at various alt angles.




That was a quick drawing I drew up as I was making my post. I realize it is not to scale and the bottom of the scope should be much lower than depicted in the drawing.
In any event, if Donnie places the pointer at the rear of the base (which I would imagine he would)I don't think he'll have any problem viewing the degree circle even with the scope pointed at zenith. The pointer will always remain in that position, regardless.
Of course, it helps to make the degree circle as large as possible, so in this case the pointer will be placed closer to the outer edge of the base for even easier viewing.


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donnie3
Carpal Tunnel


Reged: 12/15/04

Loc: bartlesville oklahoma
Re: Degree Circles new [Re: Gastrol]
      #6086127 - 09/17/13 02:23 PM

gastrol, thanks for the drawing. I never thought of a small block of wood with a nail hammered into it as a pointer. you people are really knowledgeable, I guess that's why these forums are like a "astronomy gold mine". donnie

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donnie3
Carpal Tunnel


Reged: 12/15/04

Loc: bartlesville oklahoma
Re: Degree Circles new [Re: donnie3]
      #6088804 - 09/18/13 08:29 PM

got my setting circles all ready on the 10" dob now all I need is a moon less clear night and that can take a while as you well know. donnie

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