Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
Get a Cloudy Nights T-Shirt Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu uh, User

Equipment Discussions >> ATM, Optics and DIY Forum

Pages: 1
Ricky
Carpal Tunnel
*****

Reged: 09/09/03

Loc: Nor Cal
Source for 1.5mm thumb set screws?
      #5663778 - 02/05/13 03:27 PM

Hi All,
Im looking to replace the set screws that allow one to adjust the polar alignment reticule on the Sirius Heq5 mount with equivalent thumb screws instead. Ive found out that the screws are 1.5mm...is that pitch? Im a newbie on screw specs. Does someone have info. on this and/or know where to find such replacement screws?


Post Extras: Print Post   Remind Me!   Notify Moderator  
don clement
Vendor (Clement Focuser)


Reged: 02/02/11

Loc: Running Springs, California
Re: Source for 1.5mm thumb set screws? new [Re: Ricky]
      #5663796 - 02/05/13 03:38 PM

This should help. http://www.wisc-online.com/objects/MTL5802/mlt5802.htm

Don Clement


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Source for 1.5mm thumb set screws? new [Re: Ricky]
      #5663826 - 02/05/13 03:56 PM

I used socket head allen caps screws from Home Depot, the head is big enough to grab with my fingers so I didn't press fit a knob on it.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Ricky
Carpal Tunnel
*****

Reged: 09/09/03

Loc: Nor Cal
Re: Source for 1.5mm thumb set screws? new [Re: Pinbout]
      #5663853 - 02/05/13 04:06 PM

@Don...thanks for the link!

@Danny...did u do this replacement on your Sirius mount? If so, could you link the specific item at depot? Thanks much!


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Source for 1.5mm thumb set screws? new [Re: Ricky]
      #5663876 - 02/05/13 04:20 PM

a cg5, it had a standar metric thread just took the set screw in and matched the thread and body dia.

scopestuff sell replacements for $16


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ricky
Carpal Tunnel
*****

Reged: 09/09/03

Loc: Nor Cal
Re: Source for 1.5mm thumb set screws? new [Re: Pinbout]
      #5663883 - 02/05/13 04:23 PM

Thanks Danny! Ill check depot out.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Geo.
Carpal Tunnel
*****

Reged: 10/01/08

Loc: Upstate NY
Re: Source for 1.5mm thumb set screws? new [Re: Ricky]
      #5664893 - 02/06/13 09:55 AM

Doubt they're 1.5mm. Possibly 1.6, but I'd think 2.5 or 3 are more likely. At these sizes there are no thread pitch options. Find someone with a tap set to get a sure match. A good Ace will have a selection of metric fastners. I go to Richard Russo's hometown for the best selection in my area. Look for an ACE in an industrial area.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Gordon Rayner
Carpal Tunnel
*****

Reged: 03/24/07

Re: Source for 1.5mm thumb set screws? new [Re: Geo.]
      #5665887 - 02/06/13 07:25 PM

Shear-Loc have press-on heads for some metric size socket capscrews . www.shear-loc.com 1-800-775-5668

They have a competitor in Flippin, Arkansas

www.microplastics.com

You could drill and tap some Delrin, nylon, PVC, aluminum, acrylic, Lexan, square pieces, and then lock with a nut, if necessary.

For thumbnuts, I have pressed square Delrin onto steel nuts. Drill the hole ( shallow, not a through-hole) of a size which just clears the sides of a hex nut. The hex corners cut into the Delrin, to lock the nut. Chamfering the edge of the hole makes entry smoother.

A thru hole to clear the screw body can be made before or after the nut is installed. If desired, make that hole the tap size, and start the tap in the threads of the installed nut. A tightly fitted nut will not usually tend to be pushed out during the beginning of tapping of the plastic . Or, clamp the nut with a plate or wood block with hole, to keep the nut from being screwed upward out of its hole during the start of tapping.

Edited by Gordon Rayner (02/06/13 09:10 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ricky
Carpal Tunnel
*****

Reged: 09/09/03

Loc: Nor Cal
Re: Source for 1.5mm thumb set screws? new [Re: Gordon Rayner]
      #5665902 - 02/06/13 07:35 PM

Thanks for all of the suggestions!

Post Extras: Print Post   Remind Me!   Notify Moderator  
don clement
Vendor (Clement Focuser)


Reged: 02/02/11

Loc: Running Springs, California
Re: Source for 1.5mm thumb set screws? new [Re: Gordon Rayner]
      #5666005 - 02/06/13 09:03 PM

Quote:

Shear-Loc have press-on heads for some metric size socket capscrews . www.shear-loc.com 1-800-775-5668




Plus 1 on Shear-Loc press-on thumbscrews. I have had a Shear-Loc press-on assortment set (size #4 to 5/16) for over 30 years and has passed the test of time. The nice thing is that Shear-Loc works on all types of SCHCs including nylon SHCSs that work as a non-marring set screw. Also if the metric size is close in diameter and pitch they may be interchangeable. For example an inch size screw UNF 10-32 fits a threaded metric M5-0.8 screw hole pretty well since the OD of the #10 screw is 0.190" and the OD of an M5 screw is 0.197" also the 0.8mm pitch is very close to 32 threads per inch. A quick pass with a 10-32 tap will fix any discontinuity.

Don Clement


Post Extras: Print Post   Remind Me!   Notify Moderator  
Gordon Rayner
Carpal Tunnel
*****

Reged: 03/24/07

Re: Source for 1.5mm thumb set screws? new [Re: don clement]
      #5666041 - 02/06/13 09:23 PM

I used 10-32 in the several M5-0.8 holes for bearing attachment on the Fuji 25 x 150 binocular body , first model (with trunnions), to install a a headrest support plate over the bearing flanges. There was never any problem, on many specimens, some of which are still in service.

This was because stainless socket cap screws M5-0.8 , of the required length, were not available ,or special order import $$$.

Such a substitution would not be appropriate for highly stressed automotive or aircraft application.


Post Extras: Print Post   Remind Me!   Notify Moderator  
don clement
Vendor (Clement Focuser)


Reged: 02/02/11

Loc: Running Springs, California
Re: Source for 1.5mm thumb set screws? new [Re: Gordon Rayner]
      #5666053 - 02/06/13 09:29 PM

Quote:

Such a substitution would not be appropriate for highly stressed automotive or aircraft application.




Yep. Don't intend to drive or fly an import telescope mount. ;-)

Don


A song of great social and poetical import."
http://www.youtube.com/watch?v=i-4AheUl6ls

Although in the original ATM book series there is mention of a TN that was killed when his under built mount collapsed on him.



Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Source for 1.5mm thumb set screws? new [Re: don clement]
      #5666310 - 02/07/13 12:23 AM

Quote:


A song of great social and poetical import."
http://www.youtube.com/watch?v=i-4AheUl6ls






I'd rather reference Husker Du - Wheels

[didn't link the youtube because of content.]


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
12 registered and 20 anonymous users are browsing this forum.

Moderator:  ausastronomer, richard7, Starman81 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 676

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics