LumberJocks

Tetrahedral Drilling Jig for Molecular Models

  • Advertise with us
Project by ironwoods posted 789 days ago 2417 views 6 times favorited 10 comments Add to Favorites Watch

Because I advertise wooden models for chemistry, geometry, and geology on my website: DrB Science Basics, I was asked by a biochemistry professor to make several custom jigs for large chemical models to be built as a summer project involving high school and university students. Those who have tried are aware that tetrahedral angles (109.47…. degrees) are very fussy and the design of a jig for accurately drilling them is not trivial. The sequence of operations for drilling a 2 1/4 ” diameter carbon atom is shown.

-- Eric, Maine,http://drbsciencebasics.com





10 comments so far

View ownafixerupper's profile

ownafixerupper

11 posts in 996 days


#1 posted 789 days ago

The nerd part of me that remembers chemistry is definitely amused and a wee bit nostalgic. That’s a very nice-looking jig—-good job getting the angles set up just right.

View jeepturner's profile

jeepturner

920 posts in 1427 days


#2 posted 789 days ago

Very nice tool. Thanks for all the pictures of the sequence.

-- Mel,

View KnotCurser's profile

KnotCurser

1814 posts in 1703 days


#3 posted 789 days ago

Love this! It’s a great jig and a great reason to build – teaching Science is SO important.

I applaud your efforts, sir!!!!

-bob

-- Robert Rhoades WoodWorks / Email: rrww@rhoadesclan.com / www.rhoadesclan.com

View Ken90712's profile

Ken90712

14878 posts in 1823 days


#4 posted 789 days ago

Great jig, for a great project!

-- Ken, "Everyday above ground is a good day!"

View Helkat's profile

Helkat

74 posts in 930 days


#5 posted 789 days ago

Really neat jig. I’m fairly certain I wouldn’t have come up with such a simple-looking solution that that problem.

Well done!

-- Nat, UPstate NY, http://www.cordlessimpactdriverhq.com/

View oldnovice's profile

oldnovice

3715 posts in 2002 days


#6 posted 789 days ago

A number of years ago I made some models similar to this using Plexiglas spheres as part of a orientation for new employees (I also made a SOMA cube out of Plexiglas cubes that looked like ice cubes).

I can understand the requirements for accurate angles and can really appreciate the fixturing designed for these chemical models!

GOOD WORK and the students will be able to “visualize” better!

-- "I never met a board I didn't like!"

View ChrisK's profile

ChrisK

1113 posts in 1716 days


#7 posted 788 days ago

Tetrahedral Drilling Jig for Molecular Models, not something you hear everyday. Cannot say I miss chemistry much. Great Jig.

-- Chris K

View rance's profile

rance

4130 posts in 1795 days


#8 posted 785 days ago

Clever solution there.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View ironwoods's profile

ironwoods

2 posts in 838 days


#9 posted 785 days ago

Thank you for your comments. I’m a brand-new member and from the beginning have felt that this is a fine organization of creative people.

Making this tetrahedral jig requires no complex (expensive) machinery for setting a 109.47… degree angle. It requires a little trigonometry for setting the angle of the ramp. The idea for the rest of the design comes from playing with a wooden model. (Type “Tetrahedron with Enclosed Sphere” with the quotes on Google and you’ll see what I mean.) I observed that three of the spokes of the sphere are 120 degrees apart, although inclined at an angle. I only needed to set a precise 30 degree angle for the jig.

-- Eric, Maine,http://drbsciencebasics.com

View BTKS's profile

BTKS

1967 posts in 2099 days


#10 posted 785 days ago

Freakin ingenious!

-- "Man's ingenuity has outrun his intelligence" (Joseph Wood Krutch)

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

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase