Statapults (catapults for statistics)

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Project by Brodan posted 10-23-2017 12:27 AM 1125 views 1 time favorited 9 comments Add to Favorites Watch

Set of catapults for teaching six sigma class. I retired from my job early this year and now do consulting. My previous company owned a set of these that I used when I taught six sigma classes for them. Now need a set of my own and didn’t want to spend the $250.00 apiece that they sell for. Had some red oak, less than $50 for all the hardware, scales and protractors. Finished with a coat of amber varnish and a coat of wax.

And a good excuse to get into my new much smaller shop (downsized last year in anticipation for retiring).

-- Dan, TN

9 comments so far

View kdc68's profile


2644 posts in 2210 days

#1 posted 10-23-2017 01:09 AM

Pretty nice ! Congrats on retirement.

-- Measure "at least" twice and cut once

View Brodan's profile


140 posts in 1236 days

#2 posted 10-23-2017 02:41 AM


-- Dan, TN

View ohwoodeye's profile


1967 posts in 3087 days

#3 posted 10-23-2017 01:19 PM

Retiring… I’m downsizing my shop. That sentence doesn’t make sense to me.

-- Directions are just the Manufacturer's opinion on how something should be assembled. ----Mike, Waukesha, WI

View helluvawreck's profile


30512 posts in 2800 days

#4 posted 10-23-2017 02:30 PM

It looks like you did a very nice job on these. Congratulations.

helluvawreck aka Charles

-- helluvawreck aka Charles,

View Bill_Steele's profile


269 posts in 1665 days

#5 posted 10-23-2017 02:59 PM

Nice job! There are alot of adjustment options—I assume to dial in a specific range or for different weight objects to be thrown? How do you use these in your teaching process?

Thanks for sharing.

View Richard Campbell's profile

Richard Campbell

7 posts in 384 days

#6 posted 10-23-2017 03:20 PM

View majuvla's profile


11880 posts in 2801 days

#7 posted 10-23-2017 04:11 PM

Good cooperation between woodworking and engineering.

-- Ivan, Croatia, Wooddicted

View Brodan's profile


140 posts in 1236 days

#8 posted 10-24-2017 12:35 AM

Thanks all!

Mike, retiring for me meant downsizing to a smaller home without space for a shop. Did put in a 12×28 building, 10’ of which is storage, only leaving 12’x 18’ for a shop.

Bill, I teach six sigma. As part of the training students will select the factors (adjustments) they think most affect the distance (critical factors) that the catapult fires, test fire the statapults a limited number of times and document the distances. Entering what they learn in a statistical software package they develop a predictive model. Once their model is complete I randomly select 3 distances between 20” and 120” and they enter the distance in the software which tells them where to set each adjustment and they fire a ball at a target set at each distance. Typically have 2 teams compete, thus the two statapults. Having both fixed (stop holes, number of rubber bands, ball type) and infinitely variable adjustments (pull back angle and front post tensioner) gives the students plenty to think about. When the students develop a solid predictive model they are amazingly accurate over the entire distance.

-- Dan, TN

View bushmaster's profile


2824 posts in 2216 days

#9 posted 10-25-2017 02:57 PM

Very interesting what they are used for. Well done reproduction.

-- Brian - Hazelton, British Columbia

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