Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Swift 839 Tripod Help and Options?

  • Please log in to reply
16 replies to this topic

#1 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 20 February 2021 - 02:22 AM

It's been over a year and I've still not found a replacement or a good solution for a missing tripod hub.

An original Swift is impossible to find, so I'm looking for one from another scope to modify.

 

Off and on I've been watching the ads, tried a known parts source, put up want ads (for an original and or a Towa), but still no luck.

 

Swift-Towa-Mount2.jpg

I found that the hub from my alt-az 60/800mm Crescent (Towa) fits the Swift's mount,

but I don't want to pirate it from that kit.

 

Towa-Head.jpg

Here's a close up of a early Towa hub

It's different than the newer ones as it accepts a 1.25" shaft

 

Swift-839-Tri-Hub.jpg

An Original Swift hub. 

 

Towa-Head-Reworked.jpg

If I can find a Towa, I'd add aluminum plates to the sides of the tines,

and use some filler to do something like this.

 

You'd think there would be some of the Towas out there but if not

maybe I can find another small hub like from a Manon or ATCO.

 

Kenko-Hub-1.jpg

An Atco type hub on my Kenko. It's small and the tines are already the right size.

It would only need to be bored out for a larger shaft.

 

Manon-Hub.jpg

A Manon hub

 

Swift-Manon-Hybrid.jpg

Photoshop mock up to see how a Manon would look.

a Manon would need both a center tube added and the tines widened.

It could also be reworked and smooothed and rounded...

but I'm not sure it fits in with the style of the upper mount?

 

Whatever I use I'd like it to be small enough to fit the storage peg in the box.

 

A Towa like the one above would probably be my first choice but I'm getting desperate.

Any ideas or sources?


Edited by Kasmos, 20 February 2021 - 02:10 PM.

  • astro140 likes this

#2 Terra Nova

Terra Nova

    ISS

  • *****
  • Posts: 23,986
  • Joined: 29 May 2012
  • Loc: Cincinnati Metro Area

Posted 20 February 2021 - 09:06 AM

Could you have one 3-d printed? There’s a place that I’ve seen mentioned somewhere here what will do it if you send them a SolidWorks 3-D file or *.dxf file.



#3 blakestree

blakestree

    Vostok 1

  • *****
  • Posts: 156
  • Joined: 26 Aug 2011
  • Loc: Savannah, GA

Posted 20 February 2021 - 09:13 AM

Have you tried contacting owners of parts scopes on the registry? Also, Dave Trott fabricates for classic telescopes. Have you talked to him?


  • Spyke likes this

#4 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 20 February 2021 - 01:59 PM

Could you have one 3-d printed? There’s a place that I’ve seen mentioned somewhere here what will do it if you send them a SolidWorks 3-D file or *.dxf file.

I don't know anything about that kind of software. I'd really like to find something to modify, it's more my style and speed. I do have a couple of ideas on how to make one from scratch, but starting with a similar part would be easier. Also, whatever I come up with, I'd paint to match the rest of the mount. I have no experience with 3D printed parts so I'm not sure how good they take paint. 

 

Have you tried contacting owners of parts scopes on the registry? Also, Dave Trott fabricates for classic telescopes. Have you talked to him?

No and no, but there's a couple of folks I'll probably reach out to.


  • blakestree and Terra Nova like this

#5 Terra Nova

Terra Nova

    ISS

  • *****
  • Posts: 23,986
  • Joined: 29 May 2012
  • Loc: Cincinnati Metro Area

Posted 21 February 2021 - 09:03 AM

I'd really like to find something to modify, it's more my style and speed. I do have a couple of ideas on how to make one from scratch, but starting with a similar part would be easier. Also, whatever I come up with, I'd paint to match the rest of the mount.“

 

Chris, I think your best bet then is to find a Mayflower/Manon 814 hub like in your earlier post. They’re a nice cast aluminum and machine well. Here’s my old Mayflower tripod. I had initially bored mine out for an Eq. 1 mount, but in its latest iteration I machined a press-fit aluminum plug for the bore and then faced the whole thing off to make a tripod for my Questar. I would imagine that they are much easier to find than the Swift hubs. They were a much more plentiful model and the mounts have a way of breaking down at the slow motion controls.

Attached Thumbnails

  • DD540DEC-FAF1-4DA5-9D28-E4F3CD73C6CF.jpeg

Edited by Terra Nova, 21 February 2021 - 09:06 AM.

  • Bomber Bob, walter a and Kasmos like this

#6 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 21 February 2021 - 01:28 PM

I'd really like to find something to modify, it's more my style and speed. I do have a couple of ideas on how to make one from scratch, but starting with a similar part would be easier. Also, whatever I come up with, I'd paint to match the rest of the mount.“

 

Chris, I think your best bet then is to find a Mayflower/Manon 814 hub like in your earlier post. They’re a nice cast aluminum and machine well. Here’s my old Mayflower tripod. I had initially bored mine out for an Eq. 1 mount, but in its latest iteration I machined a press-fit aluminum plug for the bore and then faced the whole thing off to make a tripod for my Questar. I would imagine that they are much easier to find than the Swift hubs. They were a much more plentiful model and the mounts have a way of breaking down at the slow motion controls.

I thought the same thing about how the controls break leaving them useless and also how nicely you repurposed yours. I think I'll reach out to Chuck since he's had several incomplete Manons and if not, who knows, maybe he'll have one of the others?


  • Terra Nova and GreyDay like this

#7 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 25 February 2021 - 04:52 AM

I reached Chuck but for now he didn't know if he had anything, so I'm going with modifying something I already have.

It's something that I didn't recognize it's potential but because it's really late I'll show it and explain later.

 

For now I'm asking for one of you guys to help me with the dimensions of an original Swift hub.

Gary posted a couple of the dimension so if he or another of you can confirm and ad some of the missing numbers,

I'd appreciate it very much!

 

Hub-Dimensions.jpg

Center point to outer edge of Tine  (2"?)

Center to the center of the Tripod Bolt Hole? (or center of hole to outer edge)

Total Height?

Height of Tines?

Width of Tine at it's foot? (upper right drawing)

 

What I'm doing will be slightly taller and a little different, but I'd basically like it to mantain the same foot print.


Edited by Kasmos, 25 February 2021 - 04:57 AM.

  • blakestree and Bomber Bob like this

#8 blakestree

blakestree

    Vostok 1

  • *****
  • Posts: 156
  • Joined: 26 Aug 2011
  • Loc: Savannah, GA

Posted 25 February 2021 - 08:03 AM

I can get the numbers you need, if you can give me a day or two.


  • Kasmos likes this

#9 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 25 February 2021 - 09:37 PM

Thanks!

 

While I wait for some numbers, here's what I'm working with and the plan

 

806-Mount-1.jpg

This mount is from Mayflower's version of a 60mm Vari-Power Telescope (I believe model 806?)

I've owned it for 40 years and many times have wondered if I could somehow put it to better use.

Only now realising it could serve as a starting place for the Swift's ub.

 

806-Hub.jpg

The center hole is about 22mms and they are so tiny, they only have room for the original upper metal bars of their stock tripods.

Other than maybe some kind of small table top scope, priorly these features made me think it was useless.

 

Added-Tine.jpg

Each of the tines will be widened and extended via some 1/8" thick scrap aluminum I have.

 

]Hub-Parts.jpg

The materials to make it happen. The item in the back is the center from a Angel Food Cake Pan.

Thinking one day it might be useful for some kind of telescope part.

 

Swift-GEM-Small-Base.jpg

Photoshop mock up

 

LMD-Mount-Hub.jpg

Keith's (strdst) cool, strange, and odd L.M. Dickenson-Swift clone was the inspiration for using the small hub.


Edited by Kasmos, 25 February 2021 - 09:42 PM.


#10 strdst

strdst

    Fly Me to the Moon

  • *****
  • Posts: 5,052
  • Joined: 23 Mar 2008
  • Loc: Oregon Territory

Posted 26 February 2021 - 02:38 AM

Chris,

 

I'd be happy to loan you Lila's hub if you promise to send it back eventually.



#11 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 26 February 2021 - 03:58 AM

Keith,  I'd be too tempted to keep it! waytogo.gif  

 

If I was milling one out of billet aluminum or doing a 3-D printing I'd probably take you up on it,

but since I'm working with what I have, I should be good with just some measurements. 

If you could give some based on the drawing I posted in post#7 that would be cool. 

 

One other thing. The tripod legs on Lila look small (Your pic below) like on a Manon instead of those on, say a Monolux. 

LMD-In Box.jpg

From what I've seen the Swifts appear to fill the box to it's edge.


Edited by Kasmos, 26 February 2021 - 03:59 AM.


#12 Garyth64

Garyth64

    Fly Me to the Moon

  • *****
  • Posts: 5,601
  • Joined: 07 May 2015
  • Loc: SE Michigan

Posted 26 February 2021 - 11:48 AM

I re-used your drawing.

 

The total height is 1-15/16"

The width of the base is 5/8".  The height is 1-1/16".

The c/c of the hole is 9/16".

The center of the hub to the centerline of the bolt hole is 1-7/16".

 

The width of the flange is tapered.  It is 1-1/4" at the top, and 1-1/8" at the bottom.

 

And the overall height minus the height of the off-set of the flange is 1-5/8".

 

The inside of the hole is 1-1/4" and the OD is 1-1/2".

 

Swift 839 hub 3.jpg


Edited by Garyth64, 26 February 2021 - 11:54 AM.

  • blakestree, Terra Nova, walter a and 1 other like this

#13 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 26 February 2021 - 02:35 PM

I re-used your drawing.

 

The total height is 1-15/16"

The width of the base is 5/8".  The height is 1-1/16".

The c/c of the hole is 9/16".

The center of the hub to the centerline of the bolt hole is 1-7/16".

 

The width of the flange is tapered.  It is 1-1/4" at the top, and 1-1/8" at the bottom.

 

And the overall height minus the height of the off-set of the flange is 1-5/8".

 

The inside of the hole is 1-1/4" and the OD is 1-1/2".

 

attachicon.gifSwift 839 hub 3.jpg

Excellent Gary!, very thorough.... thank you!

 

It's weird that the flange is different at the top and bottom.

My guess is, it isn't intentional and might be due to some kind of sand casting shrinkage at the bottom. shrug.gif

 

That brings up a long and lingering question I've had. What is the proper name for them? In the past I've called them Lugs, or Prongs, and then came upon a seller calling them Tines. Technically a Prong or Tine is pointed so those may not be the best terms for them.

 

I just Googled Lug and it's probably the most fitting term.

 

In engineering:"A projection or head on a metal part to serve as a cap, handle, support, or fitting connection".

 

I think I''ll go with Lug from here on. grin.gif



#14 blakestree

blakestree

    Vostok 1

  • *****
  • Posts: 156
  • Joined: 26 Aug 2011
  • Loc: Savannah, GA

Posted 26 February 2021 - 02:38 PM

Sorry, I took too long. Great job, Gary!



#15 Garyth64

Garyth64

    Fly Me to the Moon

  • *****
  • Posts: 5,601
  • Joined: 07 May 2015
  • Loc: SE Michigan

Posted 26 February 2021 - 03:14 PM

"It's weird that the flange is different at the top and bottom.

 

My guess is, it isn't intentional and might be due to some kind of sand casting shrinkage at the bottom."

 

When I looked at it, I remembered that I had told you 1-1/4" when I first measured it , but then I measure the bottom and went, huh?  It was 1-1/8".

 

I thought how cool.  I think it's tapered to accommodate the tripod legs.  There's a slight angle when the tripod legs are attached.  Maybe just another little thing about these Swift's.


  • Kasmos likes this

#16 strdst

strdst

    Fly Me to the Moon

  • *****
  • Posts: 5,052
  • Joined: 23 Mar 2008
  • Loc: Oregon Territory

Posted 27 February 2021 - 02:55 AM

Keith,  I'd be too tempted to keep it! waytogo.gif  

 

If I was milling one out of billet aluminum or doing a 3-D printing I'd probably take you up on it,

but since I'm working with what I have, I should be good with just some measurements. 

If you could give some based on the drawing I posted in post#7 that would be cool. 

 

One other thing. The tripod legs on Lila look small (Your pic below) like on a Manon instead of those on, say a Monolux. 

attachicon.gifLMD-In Box.jpg

From what I've seen the Swifts appear to fill the box to it's edge.

Hmmm, good to know if you ever asked to borrow one of my chain saws for the weekend!

 

I looked for like 20 hours for a Swift case and telescope with a hub I could gift you. Through PM's I discovered I had sold it in 2017! I did keep the round slider legs though to complement my Lila. Offer still stands.


  • blakestree and walter a like this

#17 Kasmos

Kasmos

    Soyuz

  • *****
  • topic starter
  • Posts: 3,537
  • Joined: 19 Aug 2015
  • Loc: So Cal

Posted 27 February 2021 - 03:16 PM

Hmmm, good to know if you ever asked to borrow one of my chain saws for the weekend!

 

I looked for like 20 hours for a Swift case and telescope with a hub I could gift you. Through PM's I discovered I had sold it in 2017! I did keep the round slider legs though to complement my Lila. Offer still stands.

20 hours? You really know how to make a guy feel guity. sigh2.gif

BTW, I do have the case.

 

There is one thing I'd like to know.

Since mine will kinda-sorta look like it, could you see how these numbers compare with Lila's?

It could just be the photo, but it looks like hers might have taller lugs and possibly a slightly wider stance?

Swift-Hub-Garys-#s.jpg




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics