8"ACF, AR152, ED100, ST80, EQ6Pro, Duo-T, AZ3, EQ1
-DannyMy warehouseMy Channel
Quote:They function very poorly in a vertical position. The problem is that all the balls jam together when the bearing is tilted. This is not a true "ball bearing" where the balls are held in separated positions in a race. Instead, it's just a bunch of balls running in a groove. The friction is very low (about 1%) when horizontal, but it tends to increase abruptly by a factor of about 5 when the bearing is tilted. I tried to use one as a polar axis (tilted 45 degrees) but the irregular friction made it unacceptable.They work great as an azimuth bearing although you will probably need to provide additional friction. They are also great for a rotating tube on an equatorial, where the uneven friction isn't a big problem.
"The White Zone is for loading or unloading of passengers only. No Astrophotography." Cosmic Acres! Greatest restoration challenge: Tulley and Sons 3" achromat on Altazimuth mount, circa ~late 1820s
Selfmade 83x914mm w "Jaegers" Achromat Selfmade 127x700mm w "Surplus Shed" Achromat Orion XT8 Selfmade SiTech ALT AZ Celestron Advanced VX
AS of NSW
AS of Hunter Valley
Fact: I like reflectors and big ones. All the refractors I own are either finderscopes, binoculars, or riflescopes.
18"/F4.5 Obsession #1333 fully optioned (OMI Optics)
14"/F4.5 SDM #33 fully optioned (Zambuto Optics)
10"/F5.3 SDM #50 fully optioned (Suchting Optics)
Pentax XW's, T4 & T5 Naglers , UO HD orthos, 6mm Delos, 8mm Radian, 8.5mm Pentax XF, 13mm Ethos. 12mm Celestron Illum Astrometric eyepiece. Rainbow Optics Spectroscopic Eyepiece Set. Orion Optics UK 250 lpi Ronchi grating eyepiece. 2" Astronomiks UHC, OIII & H-Beta filters, 2" DGM Optics NPB filter. 2" Variable Polariser. 2" Hoya colour filters.
Leupold 10x42 & Pentax 16x60 binos.