Not sure if I'm understanding you query correctly.
North is zero and east is to the right at 90degrees and so on.
Looking down at the calibrations this is clockwise.
As Jethro said, try eBay I did and found a supplier in England.
Thanks Richard - knew there was good reason of course for the Az to read clockwise - how silly of me !
Ok will google for Wixey
to convert RA-Dec to Alt-Az, and I've ordered a digital compass and inclinometer for setting circles. I've been wondering how to make the calibrations for the astrolabe. Hmmm...
Hi Richard,
Per my PM, I will get you the specs for my 10" GSO. I am pretty sure that the the viewable area is 25 to 27 cm radius of an overall radius of 28.25cm. I will check. The depth is 19mm. (I am using a 51mm desk grommet)
Have a look at this attached (preliminary) pdf. Depending on your availability to a printer, maybe you can print a small section (to scale) on A4 and see if it will work. If it doesn't work just let me know, we can sort it out.
Colin, I suspect the numbers may be to big, or may not line up properly with your 50mm cutout.
Are you going to fit a magnifying glass over this cutout, if so we can make the numbers smaller. Can you post a pic of the base.
Colin, I suspect the numbers may be to big, or may not line up properly with your 50mm cutout.
Are you going to fit a magnifying glass over this cutout, if so we can make the numbers smaller. Can you post a pic of the base.
Richard
Richard,
I have decided to leave out the partial hole cover and thus the numbers and scale now fit very well. (You were right). Final checking will take a little longer as unfortunately when I printed it on my plotter it came out for some bizarre reason at 95% scale (The 100mm true line was 95mm long!) So I will need to check the settings before printing again.
My pleasure Colin, don't hesitate to ask if you need to tweak it for any reason.
These things have to be perfect, don,t they?
I will be looking out for your pic.
Attached are some pics of a quick dob mount that I built for my Imaging scope. as PM'd, the radius of the azimuth board is 23cm, and the diameter of the altitude semicircle is 11.8cm.
I built this mount over a few days, thanks to ideas from Alex (mental4astro).
I've used a lazy susan bearing in the azimuth, and for braking, I placed three slide eazy pads from bunnings, and stuck some felt over it. the combined height was 1mm more than the gap of the two boards with the bearing, so the felt was pressing on the upper board. I tightened the pivot bolt a bit (M12 with a nyloc nut and washers), and its now very smooth with no overshoot and stays in one place. have attached castors as well.
I have to get some teflon for the altitude, and reduce the size of the ota cradle, apply some varnish.
Excellent, thanks Richard, one minor change, can you please separate them into two pdf's, one for alt, and one for the az axis.
will then take them to the local print store.
