School Project with crossbow got shot down

Crossbow Hunting

Moderator: Excalibur Marketing Dude

Post Reply
User avatar
XB I GO
Posts: 634
Joined: Sun Nov 29, 2015 10:00 am
Location: Texas

School Project with crossbow got shot down

Post by XB I GO »

Our class had a few topics assigned to a few people each. Mine was "Leverage". We're supposed to demonstrate the topic with some sort of model. I made a sort of crossbow out of a piece of raton with a bow string mounted to a board. I showed how hard it was to "cock" the string by hand. Then I showed how it was easier with the Excalibur cocking rope. Then it was even easier with the Dr Stirrup 4X4 Kocker. Last, I put a ratchet strap on it and hooked the strap to my bowstring and cranked it up. The teacher rambled on about fulcrums and multipliers and transfer of work something whatever whatever. She said that was not leverage. I said I think a person with a crossbow has a lot of leverage. She didn't think that was funny either. I have to do the project over :crazy:

Image
Hillcountry
Posts: 516
Joined: Sun Jan 31, 2016 1:21 pm
Location: New Hampshire Lakes Region

Re: School Project with crossbow got shot down

Post by Hillcountry »

Tough dealing with “snowflake” teachers these days, huh?
I would have given you an excellent!
Excalibur Micro 355
Mission MXB 360
xcaliber
Posts: 12821
Joined: Fri Jan 11, 2013 7:35 pm
Location: NW Indiana

Re: School Project with crossbow got shot down

Post by xcaliber »

X2! Hard to prove a teacher wrong, especially when they know everything. :eusa-deadhorse:
It’s not the way you rock, it’s the way that you roll!
colouredchameleon
Posts: 798
Joined: Sat Nov 24, 2012 6:44 pm

Re: School Project with crossbow got shot down

Post by colouredchameleon »

Leverage
noun
- the action of a lever, a rigid bar that pivots about one point and that is used to move an object at a second point by a force applied at a third.

- the mechanical advantage or power gained by using a lever.

Dam teachers what do they know :crazy:

I guess one could conclude another fact :problem: in that you
failed on two counts
"to also demonstrate the other definition of leverage as well. :lol:

"power or ability to act or to influence people, events, decisions, etc.; sway:"


A Double Whammy.

I would say you should count your lucky stars you get to do a "do over".
Hi5
Posts: 1616
Joined: Fri Aug 06, 2004 1:56 pm
Location: Manitoba

Re: School Project with crossbow got shot down

Post by Hi5 »

Levers, and ropes and pulleys are examples of mechanical advantage.

However, your demonstration did offer one example of leverage....your ratchet strap uses leverage to advance the ratchet, the fulcrum is the pin the lever turns on.

Just remember, when you point out to people how they are in error, do it in such a way that you don't appear to be trying to demonstrate how clever you are and how stupid they are.
"Gun Control Laws"--trying to nag criminals into submission.
hankenhunter
Posts: 2978
Joined: Mon Jul 12, 2010 10:21 pm
Location: Thompson/Nicola, British Colombia

Re: School Project with crossbow got shot down

Post by hankenhunter »

I found the smartass comment funny. :lol: Your teacher has no sense of humor. You came close XB, but technically your teacher was right. You might have to dum it down and go with accepted examples. I do like your ideas though.
Hank
shafferm
Posts: 300
Joined: Thu Jan 17, 2008 7:04 pm
Location: Mason, Michigan

Re: School Project with crossbow got shot down

Post by shafferm »

Check out the goats foot lever and the gaffe lever. Both were used to help cock medieval style crossbows. The gaffe lever is a bit easier to build than the goats foot lever.

https://todsworkshop.com/blogs/blog/crossbows-spanning-methods
2002 Exomag
Varizone with Burris Sig. Zee Rings
My mods:
Scope cover adapters
Optomechanical rangefinder
Custom built lit nocks
BCY Trophy flemish string
20" XX75 2219 arrows with 4" feathers
User avatar
Boo
Posts: 14299
Joined: Thu Dec 29, 2005 11:04 pm
Location: Newtonville, Ontario, Canada
Contact:

Re: School Project with crossbow got shot down

Post by Boo »

Your trigger is an example of a lever/fulcrum.
Some people just like stepping on rakes
flightattendant100
Posts: 4795
Joined: Thu Jul 30, 2009 5:06 pm
Location: Ft. Worth, Texas

Re: School Project with crossbow got shot down

Post by flightattendant100 »

Boo wrote:
Fri Jan 18, 2019 8:31 pm
Your trigger is an example of a lever/fulcrum.
BRAVO!!! make that sucker longer and said trigger gets lighter, huh! Leave it to Boo
flightattendant100
Posts: 4795
Joined: Thu Jul 30, 2009 5:06 pm
Location: Ft. Worth, Texas

Re: School Project with crossbow got shot down

Post by flightattendant100 »

Poor ol' blue collar carpenters leverage lesson..... Hit it with your hammer... if it doesn't move, hit it harder...if it still doesn't move get a bigger hammer...a sledge can be yo friend! ( lesson #2...don't let poor ol' blue collar carpenters get you in dutch with your teachers! or your folks!)
User avatar
artifact
Posts: 387
Joined: Thu Nov 05, 2015 8:04 am
Location: NE PA.

Re: School Project with crossbow got shot down

Post by artifact »

Just tell the teacher that you saw them in the lounge being cozy with another teacher, and if you don't get an A+ you will tell her husband, now that's leverage! :lol:
Seriously, if you could make up some type of cocking device using the fulcrum principle of leverage, I think the project would possibly pass. Maybe could use multiple sheave pullies on a cocking device, that should fit the criteria of a multiplier.
I don't want you to get an F, maybe better to move on to plan B and not listen to me! :lol:
User avatar
nchunter
Posts: 197
Joined: Mon Oct 17, 2005 2:48 pm
Location: Piedmont, North Carolina

Re: School Project with crossbow got shot down

Post by nchunter »

shafferm wrote:
Fri Jan 18, 2019 7:53 pm
Check out the goats foot lever and the gaffe lever. Both were used to help cock medieval style crossbows. The gaffe lever is a bit easier to build than the goats foot lever.

https://todsworkshop.com/blogs/blog/crossbows-spanning-methods
Shaffern has a great suggestion!
User avatar
Doe Master
Site Admin
Posts: 4738
Joined: Sun Jun 25, 2006 7:57 am
Location: Baden , Ontario

Re: School Project with crossbow got shot down

Post by Doe Master »

Shafferm is a very smart engineer XB. Pick his brain he will not disappoint .
He has a very good example of levers .
Prone est ut nos es plurimus periculosus
flightattendant100
Posts: 4795
Joined: Thu Jul 30, 2009 5:06 pm
Location: Ft. Worth, Texas

Re: School Project with crossbow got shot down

Post by flightattendant100 »

Boo’s idea of trigger is good too. You can prove leverage with a trigger pull gauge at different points along the length of trigger.
Post Reply