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Collimation screw type on Edge...?

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#1 HowardK

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Posted 20 April 2013 - 08:01 PM

Just received my new Edge 8" HD.

I notice that my 3 collimation screws are Phillips headed .....is this normal?..i thought Celestron used Allen headed screws for collimation...

Any thoughts?

#2 David Pavlich

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Posted 20 April 2013 - 09:08 PM

Yep. Meade uses allen head screws. I wish Celestron used allen head as well.

David

#3 wolfman_4_ever

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Posted 20 April 2013 - 11:05 PM

Just change them out to stainless steel allen/hex. That's what I did.. I have extra's I can send if you like. I had to buy 25 of them when I only need 3. They were only $3 for the 25. Mine are for my HD11. I think the HD8 are the same thread size but shorter.

#4 HowardK

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Posted 21 April 2013 - 02:08 AM

Thanks for the offer Dave but I won't mess with them for now

#5 TG

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Posted 22 April 2013 - 03:28 PM

Just change them out to stainless steel allen/hex. That's what I did.. I have extra's I can send if you like. I had to buy 25 of them when I only need 3. They were only $3 for the 25. Mine are for my HD11. I think the HD8 are the same thread size but shorter.


+1 for swapping them for Allen head ones. Collimation becomes more precise and safer as you won't be in danger of a screwdriver slipping and damaging the corrector. Bear in mind that the screws on the EdgeHDs are metric sized so you'll need metric sized keys as well.

Tanveer.

#6 ewave

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Posted 22 April 2013 - 04:41 PM

+2
I installed the SS allen/hex ones for my 9.25 Edge. You get the ability for finer adjustments and perhaps avoid the possibility of any future stripping of the phillips head. One less problem to worry about.

#7 wolfman_4_ever

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Posted 22 April 2013 - 08:21 PM

using a t-handled hex wrench makes it that much easier!

#8 herrointment

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Posted 22 April 2013 - 09:07 PM

That is a fact.

#9 MHamburg

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Posted 23 April 2013 - 10:26 AM

I opted for Bob's Knobs.
bobsknobs.com

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#10 HowardK

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Posted 23 April 2013 - 10:50 AM

People (some) say that Bobs knobs are not that great in holding collimation

Thoughts?

#11 TG

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Posted 23 April 2013 - 12:02 PM

I eventually removed BKs in favor of Allen head screws. My opinion now is that they're great when you're new to SCT collimation but as you get used to it and try to achieve precise collimation, they get in the way. They just don't provide enough torque and tend to stick-and-give which makes collimation frustrating. Allen-head screws due to the long moment arm of the hex key are easy to turn precisely and easy to torque down to hold the collimation for long periods of time. With BKs I was always tweaking collimation but with Allen heads, it pretty much stayed put.


Tanveer.

#12 HowardK

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Posted 23 April 2013 - 12:33 PM

Good advice Tanveer

Can someone tell me the precise size of the screws for an Edge 8"

#13 HowardK

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Posted 24 April 2013 - 07:31 AM

Are the screws on the 8" Edge M3 with a thread length of 12mm?

Anyone?

#14 bilgebay

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Posted 24 April 2013 - 07:38 AM


Are the screws on the 8" Edge M3 with a thread length of 12mm?



I can tell you this when I switch mine to allen screws. I have been using allen screws with all my SCTs and as Tanveer says the collimation stays put.

#15 EFT

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Posted 24 April 2013 - 09:55 AM

I eventually removed BKs in favor of Allen head screws. My opinion now is that they're great when you're new to SCT collimation but as you get used to it and try to achieve precise collimation, they get in the way. They just don't provide enough torque and tend to stick-and-give which makes collimation frustrating. Allen-head screws due to the long moment arm of the hex key are easy to turn precisely and easy to torque down to hold the collimation for long periods of time. With BKs I was always tweaking collimation but with Allen heads, it pretty much stayed put.


Tanveer.


I did the same thing and prefer the allen head screws. Better for fine adjustment and tightening down.

#16 HowardK

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Posted 24 April 2013 - 11:07 AM

Ed

Do you know if these screws for an Edge 8" are M3 and are 12mm long?

#17 TG

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Posted 24 April 2013 - 12:49 PM

Ed

Do you know if these screws for an Edge 8" are M3 and are 12mm long?


You don't have to guess. Take one screw out completely and take it to your local hardware store. This is what I did.

Tanveer.

#18 HowardK

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Posted 24 April 2013 - 02:01 PM

My hardware store has no M3 screws nowhere nohow

Have to order on the net
Thats why someone has to tell me

#19 frolinmod

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Posted 25 April 2013 - 01:57 AM

Sometimes we assume everyone has a Home Depot or Lowes hardware store in their town. Major US city privilege bias. :o

#20 TG

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Posted 25 April 2013 - 01:09 PM

Sometimes we assume everyone has a Home Depot or Lowes hardware store in their town. Major US city privilege bias. :o


Home Depot/Lowe's are pretty bad places to get hardware. I find more variety at the smaller specialized hardware stores. Ace's is my favorite in the Seattle area. They seem to have everything I've ever needed.

If all else fails, mcmaster.com will have what you need but it's never cheap.

Tanveer.

#21 wolfman_4_ever

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Posted 25 April 2013 - 02:04 PM

I always use my mom and pop store for specialty items. They have a wide selection of SS and metric hardware.. They probably will help you measure the screw as well.

I also use a SS flat and lock washer on my screws.. probably overkill but works well.






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