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

K2 pro Alt/Az mount build log

  • Please log in to reply
23 replies to this topic

#1 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 31 July 2019 - 12:20 PM

Thought I'd share some of the work going into the more robust version of my mount. Through a little trial and error, I found the perfect combination of bearings, materials, and design to increase what the mount will hold, whilst adding a shaft lock for eyepiece changes.

For anyone that missed out on the original K2 mount, i found the most it would handle was a astrotech 106 refractor fully outfitted with finder, and leagest eyepieces out there. Im looking to have this version handle up to a skywatcher evostar 150mm ota, but will start with the 120ed. While the smaller K2 holds the 120 fine at lower magnification, theres just too much vibration with higher magnification for my liking.

As I'm completing this in between work for my day job, I plan on keeping this as an ongoing log for anyone interested.

Pictures to follow!

#2 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 31 July 2019 - 12:27 PM

Here's a view of one axis close to completion, with shaft lock, and side by side with the smaller mount.

Attached Thumbnails

  • PSX_20190731_132058.jpg
  • PSX_20190731_132129.jpg

  • rockethead26 likes this

#3 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 31 July 2019 - 12:28 PM

And the 2nd axis in process.

Attached Thumbnails

  • PSX_20190731_132042.jpg

  • zjc26138 and rockethead26 like this

#4 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 31 July 2019 - 06:34 PM

Still a lot to go, but i can at least prop it in place for an idea of what it'll be like

Attached Thumbnails

  • PSX_20190731_192934.jpg


#5 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 31 July 2019 - 06:35 PM

Compared to the smaller mount

Attached Thumbnails

  • PSX_20190731_192901.jpg

  • zjc26138 and Cometeer like this

#6 zjc26138

zjc26138

    Loved By All

  • *****
  • Posts: 9149
  • Joined: 24 Feb 2005
  • Loc: Steubenville, Ohio

Posted 31 July 2019 - 08:08 PM

Looks pretty slick!

 

Also look forward to the mounts progress. Wouldn't mind having a mount a little more stable than my Macrostar Delux for my TMB130.



#7 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 01 August 2019 - 05:20 PM

Made a little headway today. Just have to make the 3/8 adapter, and add the dovetail mount.

 

Shes real stiff, smooth and zero backlash with the big chunks of teflon in there. I'll likely finish it tomorrow, at least for testing.

 

 

Attached Thumbnails

  • PSX_20190801_181722.jpg

  • zjc26138 and Goodchild like this

#8 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 02 August 2019 - 03:30 PM

Mount itself is mechanically done, just have to finish up the dovetail clamp. I'll have my 120ed on it tonight!

#9 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 02 August 2019 - 09:51 PM

Got my 120 on it, with the resistance on each axis about 50% stiffer than my small mount. It's ts still super smooth with a telescope on it, might need to be made even stiffer (theres a lot of room to snug it up) bit i wont know til i get it outside with high magnification.

I'll guess jist a little more friction and it will be golden. One thing is for sure, and thats I'd be very confident hanging a 150ed on there, at least to trial. Weight wise nothing is going to make it bow down, and length wise i thing 1200mm focal length refractors are about as much as will be usable.

Going to try a daytime text tomorrow for vibrations and high magnification.

#10 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 03 August 2019 - 06:31 AM

Well, with a 4.7mm ep in my 120 focused on a tree branch, the results are promising. Vibration is about half of the smaller mount, and thats with it set about as loose as id ever want it, amazingly smooth to operate. With some minor adjustment i can at least half it again, which will be well into the negligible vibration territory.

Edited by jag767, 03 August 2019 - 06:31 AM.

  • zjc26138 and rockethead26 like this

#11 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16925
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 03 August 2019 - 11:39 AM

Is is possible to make the cylindrical saddle housing (alt) a tad thinner thus creating a gap?

I'm wondering if the weight of the 150ED (or another heavy OTA) would create flex and rub on the Az housing?



#12 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 03 August 2019 - 02:04 PM

Is is possible to make the cylindrical saddle housing (alt) a tad thinner thus creating a gap?
I'm wondering if the weight of the 150ED (or another heavy OTA) would create flex and rub on the Az housing?

It would take hundreds of pounds to have any flex. Between the billet aluminum and the crazy hardware its extremely overbuilt. Theres actually a .010 gap, which is plenty.

It'd actually be fun to load one up and see what the failure point is.

Edited by jag767, 03 August 2019 - 02:19 PM.


#13 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16925
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 04 August 2019 - 06:02 PM

It would take hundreds of pounds to have any flex. Between the billet aluminum and the crazy hardware its extremely overbuilt. Theres actually a .010 gap, which is plenty.

It'd actually be fun to load one up and see what the failure point is.

I thought there might be some play in the bearing thus the .010 gap might be compromised?



#14 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 04 August 2019 - 06:22 PM

I thought there might be some play in the bearing thus the .010 gap might be compromised?


Two bearing systems on each axis, plenty of preload.

#15 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16925
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 05 August 2019 - 07:50 AM

Two bearing systems on each axis, plenty of preload.

Well if it holds a 6" Apo (with minimal shakes) you'll have a winner.  IME the leverage is the main culprit more so than the weight.



#16 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 05 August 2019 - 08:19 AM

Well if it holds a 6" Apo (with minimal shakes) you'll have a winner. IME the leverage is the main culprit more so than the weight.


Absolutely! The moment arm is what changes things, but i think this will handle a 1200mm focal length. Obviously only 1 way to find out!

#17 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 05 August 2019 - 03:58 PM

Did a little more tweaking, and now its perfect. Hardly any vibration, just need to test it on a clear night. Gave a polish while it was apart, will post some photi and video shortly. Now i just need someone local with a 150mm!

#18 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 06 August 2019 - 06:37 AM

Here's a shot of it made all pretty. 

Attached Thumbnails

  • PSX_20190806_071947.jpg

  • zjc26138, rockethead26 and Steve Cox like this

#19 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 11 August 2019 - 07:46 AM

Finally had a nice night. Wasting no time I zeroed in on jupiter and jumped to my ES 4.7 on my sw120ed and it was a beautiful thing. Tiny bit of vibration when using the focuser (i mean tiny) but with careful use of the fine focus is was minimal, only for a fraction of a second. I feel comfident saying this is a complete success!
  • zjc26138, Goodchild and rockethead26 like this

#20 dscarpa

dscarpa

    Soyuz

  • *****
  • Posts: 3975
  • Joined: 15 Mar 2008
  • Loc: San Diego Ca.

Posted 20 August 2019 - 03:15 PM

 Sweet!  For my overweight C9.25XLT I'd need the one that could handle a 150 refractor.  Would you need counterweights with such a load?  My C9.25's great on my Giro but with 2 11lbs weights a bit much to carry as a Unit. My scopes currently on a Unistar Deluxe which is a bit touchy and seems to be getting more so when trying to adjust for high power tracking;.  David. 



#21 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 21 August 2019 - 11:46 AM

Sweet! For my overweight C9.25XLT I'd need the one that could handle a 150 refractor. Would you need counterweights with such a load? My C9.25's great on my Giro but with 2 11lbs weights a bit much to carry as a Unit. My scopes currently on a Unistar Deluxe which is a bit touchy and seems to be getting more so when trying to adjust for high power tracking;. David.


I don't think you could put enough on it to exceed the weight limit honestly. The tripod will tip over before the mount will he overloaded lol.

I recently picked up a 102mm f11ed refractor, and to my delight it's surprisingly stable. I'll report more after a night of observing.

#22 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 26 August 2019 - 05:17 AM

Spent significant time with the 102mm f11ed on there. In a word, it was fantastic. Incredibly smooth, the smallest amout of vibration when touching the focuser, even with a 4.7mm ep in. I would say more than passes the test. I have zero doubts the extra 100mm length of a 150 f8 would matter. Something to test in the future. As no one is knocking my door down for these, I'll probably shelf the design for a while, but it's nice to know I have one that works so well. Being the design is scalable, there's no reason I couldn't make it in a 3" or 3.5" dia model, but I only see this being useful for someone who is looking to permanently mount something very large. Like 8"-10" refractor large.

I will probably make a model of the design on my computer, so should anyone want it the programs to cnc the parts are ready to go.
  • zjc26138 likes this

#23 jeanine

jeanine

    Sputnik

  • *****
  • Posts: 25
  • Joined: 18 Jun 2007
  • Loc: Utah

Posted 07 September 2019 - 10:07 PM

Are you planning on producing and marketing these? 



#24 jag767

jag767

    Kinesis Custom Machining and Refinishing

  • *****
  • Vendors
  • topic starter
  • Posts: 993
  • Joined: 20 Jun 2013
  • Loc: Massapequa, NY

Posted 08 September 2019 - 01:38 PM

Are you planning on producing and marketing these?


Id like to, but I'd need about 20 preorders to make it happen.


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