LumberJocks

projection sundial

  • Advertise with us
Project by StLouisWoodworker posted 02-22-2015 08:58 PM 855 views 3 times favorited 6 comments Add to Favorites Watch

Here’s how it works: sun shines on the back of the dial, the dial markings are on glass, the markings project onto the base, there is a small brass pin located along the centerline in the base, time is read at the brass pin, the date can also be read at the pin but only roughly. The picture was taken at about 3:00 PM CST on Dec. 30, 2014. The pin in the projection is near the southern solstice at about 3:00 PM. The base is made of maple. The shape of the frame is motivated by the St. Louis arch. It is made of Australian figured red gum.

-- Don Snyder (38.6N, 90.3W)





6 comments so far

View LoganN's profile

LoganN

330 posts in 1366 days


#1 posted 02-23-2015 03:06 PM

Seriously cool! And it looks fantastic!

View mcoyfrog's profile

mcoyfrog

3800 posts in 3060 days


#2 posted 02-23-2015 07:56 PM

thats awesome

-- Wood and Glass they kick (well you know) Have a great day - Dug

View BikerDad's profile

BikerDad

284 posts in 3067 days


#3 posted 02-25-2015 03:21 AM

That is seriously cool. Where can one find the layout or plans for this? I’m thinking this would be a great gift.

-- I'm happier than a tornado in a trailer park! Grace & Peace.

View BikerDad's profile

BikerDad

284 posts in 3067 days


#4 posted 02-25-2015 03:23 AM

more for watchlisting….

-- I'm happier than a tornado in a trailer park! Grace & Peace.

View StLouisWoodworker's profile

StLouisWoodworker

59 posts in 3442 days


#5 posted 02-25-2015 07:40 PM

Thanks for all the comments. BikerDad’s question about ‘layout or plans” has an answer, but not an easy one. This is because the layout of a sundial depends on many factors including the location (i.e., longitude and latitude) where the dial is to be placed. I’ve written about the design of the projection dial, giving all the needed equations and a computer procedure to make the calculations. If you have a stomach for trigonometry and vector arithmetic, take a look at sundial design. The “layout” of the transmission dial is in Example 4. I would love to see a dial you make, so please post a picture when you complete it.

-- Don Snyder (38.6N, 90.3W)

View mikeatsouthpond's profile

mikeatsouthpond

4 posts in 3463 days


#6 posted 04-03-2015 04:39 PM

Great work Don!

-- Mike S., Illinois, South Pond Woodworks

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com