The Everyone Tripod Design Change & Drawing Publish

A lot of people have been asking me for the design details of the Everyone Tripod. It’s been a long and cold winter, so I’ve not had a change to put it through its paces until recently.

One thing I learned from using it “in the field” was that having the leg sides exactly parallel didn’t make for easy height adjustment, since the side clamping force was therefore produced equally along the full length of the leg assembly. A simple solution was to slightly increase the width of the brace plate “ears” so they stay clamped tightly when the lower bolt is loosened for height adjustment. Since this set up a gentle “wedge” shape along the length of the entire leg, I needed to increase the width of the top of the leg assembly (where it attaches to the hub) a little more than the brace plate ears. If you’re making your own hub, that’s a simple dimension to change, but if you’re putting this on an existing hub, just add some extra fender washers between the outside of the hub and inside of the leg pieces. In my situation with the Celestron Nexstar 102GT, three washers on each side produced the necessary spread.

After making the necessary design adjustments, I am now publishing my SolidWorks design drawings in PDF format. Note that I’m still showing the leg sides as parallel, but you can also see where the extra washers and brace plate ears seem to “interfere” with the legs. Depending on your exact cuts and design, the leg sides will have a varying about of “wedge” to them; using the dimensions and BOM I’ve included, it’ll work out fine for the Nexstar 102GT and similar mounts.

You can find the PDF drawings below; be sure to download all four. If you make your own version of the Everyone Tripod, please let me know how it works for you and include a picture of your creation!

Everyone Tripod Assembly Drawing
Everyone Tripod Leg Side Drawing
Everyone Tripod Leg End Drawing
Everyone Tripod Brace Plate Drawing

The One That DIDN’T Get Away

The Original Celestron C6

The original Celestron C6 was a Polaris-mounted 6" f/5 Newtonian.

A few months ago, I wrote about the Celestron C6 Newtonian reflector that was produced by Vixen back in the 1980’s. It was the third of four “classic black Celestrons” that I remembered from when I was a kid, and unique in that it was a wide-field telescope in contrast to the Firstscope 80, C4.5 and C8. While my early attempts to acquire one were unsuccessful, a few months ago I did win an eBay auction for a C6 optical tube assembly.

It arrived without a finder or a front endcap, but I’ve got a friend who may part with her original 6×30 finder from her SP-C6, and heavy-duty shower cap functions as an effective tube cover. There are a few small nicks in the paint, and two small holes where a Telrad base was mounted, but a little touch-up will fix those tiny cosmetic issues.

I’ve had a lot of fun tinkering with this scope (mostly in the garage and the driveway so far), and I’ve learned a few things.

The first thing I’ve learned is that the Polaris mount is more than adequate for this telescope. I really can’t think of a reason why Celestron switched this scope from the original Polaris to the much-heavier Super Polaris mount, other than increased profits in a more astrophotography-ready package. I’m thinking the astrophotography-profit angle here because there were optional dual-axis drive motors available for the Super Polaris, they could charge more for the heavier mount itself, and the 6″ f/5 OTA has a constant-distance “sled” focuser with a generously-sized secondary mirror which would appeal to shutterbugs of the day. At any rate, for visual use, the Polaris mount is simply wonderful. Even without a  second counterweight and the scope being woefully out of balance, when I lock it down, it doesn’t wiggle. At all.

It's easy to drop the rear cell from the C6, just like it is for the C4.5 -- once you know how. That makes it easy to center-spot the primary, which is necessary for collimation.

Another thing I’ve learned is that Vixen really did a great job on their Newtonians. Just like the C4.5, the C6 primary and secondary mirrors are easy to adjust. In fact, this scope practically invites collimation! It was a simple matter to drop the back half of the cell and center-spot the scope, and once I had a proper reference, the scope was collimated in a matter of minutes. The only plastic on the scope is the single focuser knob, and the rack and pinion gears of the “sled” style focuser. I’m told that those plastic gears are the only real points of potential wear and failure on this scope; everything else in the focuser is aluminum. Oh, if they just used brass for those two little parts instead of plastic! If I ever have problems with the plastic gears in the focuser, that’s what I’ll use to replace them.

I also learned why they don’t make threaded declination shafts anymore. These were super-cool-looking on the giant yellow Byers mounts that graced the 1960s and 1970s Questar-12 ads in Sky & Telescope. Perhaps in an attempt to enhance the precision feel of the original Polaris mount, the declination shaft is, in fact, a single length of 16mmx2.0 threaded rod. It does look great, and makes it easy to fine-tune the counterweight position. However, it also makes it a major pain to move the counterweight any significant distance, and taking the counterweight off the declination shaft for portability is more trouble than it’s worth. For the C4.5 OTA, there’s only one counterweight and it’s not a big deal to move the entire thing — mount and scope —  around because it’s so lightweight. I’m thinking the second counterweight is going to be around 8 pounds to accommodate the larger C6 OTA, so that’s going to make the overall setup noticeably heavier. It’ll be easier to remove the entire declination shaft for transport, should it become necessary.

As a side note, what you see in the picture is indeed a 25mm Plossl of the old Celestron “silvertop” variety. I’ve collected several Celestron silvertop Plossls over the decades, and all but one are red-lettered Vixen models of the same vintage as this scope. When I get that second counterweight made to allow for less dangerous use of the C6 on this mount, I plan to use the silvertops exclusively; in my limited testing so far, the vintage Plossls have been surprisingly good. A 16mm Nagler Type 5 might sneak onto the focuser once in a while, though…