Which screwa are which?

[Kosh]

On the bottom on my Skywatcher DOB 8" I have two sets of screws one is a Phillips (1) the other allen key (2), what one is for tightening and which is for correcting collimation, I have had a good search but cant seem to find the answer, and what are the screw holes (3) for that seem to be for something.

Thanks for any help

[Pondus]

http://members.iinet.net.au/~champas/pdf/tips/Collimation.pdf

Here is a link explaining a bit. Scroll down the page.

Regards

Rune

[Kosh]

Mmmm mine look different, but from what I can tell is that the allen key ones are adjusters and the phillips is locking, still no idea what the other ones are though

[Pondus]

Heya

I`m sorry for just giving you a link. My Orion XT8i has slighty different adjust screws than SW 200p. But in a few minutes the experts in here

will help you out much more than I can.

Rune

[Pondus]

I`m pretty confident The 3 phillips head screws are the collimation screws, Allen heads for locking.

Rune

[Pondus]

The last holes might be screw holes for the primary mirror cover?

Rune

[Kosh]

I decided to email Skywatcher, if only I could find the info on there site

[hippie]

Hears the same question asked by another member, I've copied it for you, Quote:- .

Charic, on 09 Apr 2014 - 12:48 PM, said:

Hi....the 3 screws are your adjusters, the 3 Alan bolts are the locks............Unlock the 3 locks slightly, (Anti-clockwise) then adjust the screws ( Both Anti and Clockwise to make the adjustments. Note when you tighten the Alan bolts, do it gently, or you'll misalign the mirror again?

Doesn't matter which screw you start with, just make small adjustments and look at the result on the laser or through the tool in the focuser. Its great if someone else can adjust while you look through the focuser!

The chrome knobs you refer to are Bobs Knobs?  Custom built to allow manual adjustments without tools! their not cheap either, but handy.

Note: if you manage to unscrew one completely, don't worry. Just ensure the rubber 'o' ring is still in place, and screw it back in. Its like a milking stool, adjust one leg/screw at a time.

Some folk don't even bother with the locks, but their there for security. 

When you get very confident, and you ever need a Mirror Clean, that whole bottom end comes off by unscrewing the screws around the side of the telescope. Then the whole mirror cell will drop out, literally if your not careful so cushion its release? mark an external side  screw  position to a mark on the rim, for accurate reassembly.

[Pondus]

 Just take a look at this link :

http://www.astro-baby.com/collimation/astro%20babys%20collimation%20guide.htm

Go to Collimation Step 4.  Isnt that similar to your picture? I dont think it can be explained better?

Rune

[Kosh]

 Just take a look at this link :

http://www.astro-baby.com/collimation/astro%20babys%20collimation%20guide.htm

Go to Collimation Step 4.  Isnt that similar to your picture? I dont think it can be explained better?

Rune

You read my mind as at this very instant I saw step 4 and went, aaaah thats what they are, lol

[Kosh]

Hears the same question asked by another member, I've copied it for you, Quote:- .

Charic, on 09 Apr 2014 - 12:48 PM, said:

Hi....the 3 screws are your adjusters, the 3 Alan bolts are the locks............Unlock the 3 locks slightly, (Anti-clockwise) then adjust the screws ( Both Anti and Clockwise to make the adjustments. Note when you tighten the Alan bolts, do it gently, or you'll misalign the mirror again?

Doesn't matter which screw you start with, just make small adjustments and look at the result on the laser or through the tool in the focuser. Its great if someone else can adjust while you look through the focuser!

The chrome knobs you refer to are Bobs Knobs?  Custom built to allow manual adjustments without tools! their not cheap either, but handy.

Note: if you manage to unscrew one completely, don't worry. Just ensure the rubber 'o' ring is still in place, and screw it back in. Its like a milking stool, adjust one leg/screw at a time.

Some folk don't even bother with the locks, but their there for security. 

When you get very confident, and you ever need a Mirror Clean, that whole bottom end comes off by unscrewing the screws around the side of the telescope. Then the whole mirror cell will drop out, literally if your not careful so cushion its release? mark an external side  screw  position to a mark on the rim, for accurate reassembly.

Good guide with extremely handy info, and also answered "what are Bobs Knobs" I wonder where they can be sourced from.