Sunday, July 20, 2014

Tripod Base for the Fork Equatorial Mount

Welding the base:

I welded the base out of 2x4" steel tube, 14gage.
The leveling feet were purchased from mcmaster and have a 3/4" 16tpi thread 3" swivel pad
The machined aluminum plate is milled from a 3/4" plate. The central region that the equatorial head pivots on for latitude adjustment is 8" in diameter. 

This picture shows the equatorial head mounted to the tripod. The fork arm will place the CG of the system over the middle of the tripod footprint, maximizing the stability of the mount and scope.

The mount will be anodized and the tripod will be painted once the system is fully tested and I am happy with the performance.

Machining the 6"x6", 1/2" wall, box beam tube for the fork arm. There was a fair amount of bow in the extrusion that needed to be removed via machining.



Thursday, July 10, 2014

Equatorial Mount Fabrication Pictures

























Single Arm Fork Equatorial Mount

I started the design and fabrication of a large equatorial mount for my 12" F/4 imaging newtonian.
Some of the basics on the mount are as follows:

-Single Arm Fork Equatorial
-Fixed Latitude, designed for Tucson
-Large 4.75" R.A shaft
-11" Stainless steel friction drive with a 1" Alumina Bronze roller and 2 stage timing belt reduction
-Siderial Technology Servo II system with pittman motors
-Polar scope for R.A axis
-Quick disconnect between R.A and DEC
-R.A weights approximately 65lbs, the Declination will be approximately 60lbs
-4" Shaft on DEC 
-7.5" worm gear for DEC drive with spring loaded linear rail system for backlash removal
-Steel tripod, approximately 45lbs

If you have any further questions on the design I would be happy to answer them for you. I will be adding pictures as the mount takes shape and undergoes testing.


Sunday, January 1, 2012

Sunday, September 19, 2010

Single arm fork mount for astronomy

About a year ago I got back into telescope mount making for a brief period. An old friend needed a mount for a homemade refractor. Given my past experience with Gemini Instruments, lets just say I couldn't pass up the opportunity

The basic mechanical features are:
-Dual tangent drive system(preloaded with air piston)
-1" hardened stainless steel shafts
-Radial bearings for all major axes
-Aluminum and brass construction
-Dovetail weight adjustment for altitude axis

The machine time was around 40hours, with $200 in materials.

Here is a step by step pictorial representation of the mount:










Monday, August 16, 2010