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Hi John and All, As I mentioned, while the fork mount seemed simple at first, as I worked on the design and drawings, it seemed to get more complicated, had...
Hi John and All, One obvious design flaw: The trunions can't go on the outside of the azimuth box as shown as the mirror box can't "pass through" the azimuth...
As noted recently, I've scanned a number of references related to the subject of this list, see copied email below. Mel Bartels offered to host the collection....
Hi Howard and All, Thanks ever so much for your inputs. It certainly looks like I will be able to load the entire scope pans except the top part of the...
Hi Howard, As I mentioned earlier, the rocker arm trunion is the only 1 meter telescope configuration that will fit in the Jeep with the mirror in place,...
Hi John, Another follow up on our recent luncheon discussion. In your simplified analysis, you suggested that a steel cross sectional area of 0.17 in^2 for ...
Hi Howard, One of the things we discussed at OSP was eliminating the gears from SiTech controlled telescopes and thereby (hopefully) reducing backlash and ...
Hi Dan (and John, Howard, Chuck, Dave, Craig, Mike, and All), Dan, good chat on the phone. As I mentioned, somewhat over two years ago when I got interested...
Hi Dave, Thanks for your email and analysis. Your analysis is in the same ballpark as mine (below). Please excuse my non-metric units. I used to be a good...
Hi Russ, Have you considered the main motor in a treadmill? They are small DC permanent magnet motors that generate a lot of torque and several HP. The motor...
Hi Dan and John, Devantech makes an H bridge motor controller, the MD03, that handles 20 amps, and is used in a number of electric vehicle applications. Cost...
Hi Mel and John, Many thanks for your inputs. Clearly very large telescopes can be controlled with rather small motors given enough reduction, as torque...
Hi Ian, I really enjoyed your web site, Built for Fun Electric Vehicles. Nicely put together. And it was neat to see what you have done with flight ...
Wow, the power requirements for the motors you envision will be equal to running a microwave or electric heater continuously! You'll need a pretty large...
Hi Craig and All, The 1 meter design is finally gelling. Groundbreaking shortly. Overall the design is rather similar to you 2.5 meter and other somewhat...
Hi Craig, Many thanks for your input on wheels. Phenolic is is! McMaster-Carr has a nice selection of 6 inch wheels with built in roller bearings. They...
Hi Mel, Although the 1 meter telescope will usually be operated from a location with 110 AC power, I would like it to be able to run for a while at star ...
Hi David and Andrew, Here are a couple of simple calculations for your amusement. Assume one has lightweight tessellated Foamglas mirrors that are 18 x 18 ...
Hi All, I greatly admire the flex rocker approach. This has been a great discussion and brings up two issues I have been struggling with. Advice or ...
Hi Ian, Thanks for your reply. I would appreciate some pointers from you. Here is my situation: I'm building a telescope with a 1 meter diameter mirror....
Hi Steve, Good news indeed. Besides coming, how about a talk on our work? Perhaps on your force transducer/low cost actuator package? I'd like to hear...
Hi, as for the statement "The moment of inertia goes down as the square...", I assume you mean the apparent moment inertia of the load as seen by the motor. I...
What's the need for the ground ring? Mel Bartels From: AltAzInitiative@yahoogroups.com [mailto:AltAzInitiative@yahoogroups.com] On Behalf Of russmgenet@......
Hi Aaron, You are so right! When I convert 32.5 lb-ft to oz-in it should have been 6240 oz-in, not 75,000 oz-in. There was some confusion on my earlier ...
Hi All, Below is an idea for an affordable sensor/force actuator for multiple mirror telescopes (and perhaps active meniscus mirrors). Mike Colyor has...
Hi Steve, Let me introduce you to four of the group's members, Dave Rowe, Mike Colyor, Craig Breckenridge, and John Ridgely. Dave invented the axial flux ...
Hi John, Good thinking. Turn the azimuth wheels 45 degrees, jump on top of the mirror, grab the joy stick, and cruise around a bit before heading up the ramp...
Hi John (and All), Good suggestion to forget a second stage of reduction and drive one (or more) smaller diameter azimuth wheels directly (assuming the contact...
Hi John, Below is data, including performance curves, on a 350 W scooter motor. They make lower power and lower voltage motors. Most are in the same rpm ...
Scheduled Maintenance:
We are undertaking some essential, but extensive maintenance to improve Yahoo!
Calendar. Your Group Calendar is being migrated to a much improved version of
Yahoo! Calendar. During the maintenance period, you may not have access to your
Groups Calendar.
We sincerely apologize for this inconvenience. Your Groups Calendar is in great
shape and we are working to have it available again as quickly as possible
- Yahoo! Groups & Yahoo! Calendar Team
