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19 comments

MkII Archer Automaton

Posted December 28, 2016 8:03 AM by Del the cat

Over the last few weeks I've rebult the Archer automaton with several improvements. Although there are only two basic movements driven by cams the interaction of the parts is surprisingly complex. It took an awful lot of fiddling and trial and error to get it working reliably.
Easy enough to get it working once, but I had to take a lot of slop out of the system to make it reliable.

Here's the video:-
https://youtu.be/UajIxPdUZVE

One of the key elements was turning a tiny cone of antler on my little lathe, this is fitted onto the string and allows the archer's finger to slip over it in one direction and to snag onto it as it draws back.

The control rods that run up the back were originally of ply, then copper sheet and eventually steel.
I decided to power it from a hand turned crack and wooden gears which were made from this site's free gear drawing program (the old version of the program worked better for me).
Del

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#1

Re: MkII Archer Automaton

12/28/2016 9:15 AM

Very clever addition, the cone on the string. Impressive project all around.

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#2

Re: MkII Archer Automaton

12/28/2016 10:38 AM

Very clever and nicely done.

I'm wondering how accurately the system shoots. Do you have any photos of the target patterns?

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#3
In reply to #2

Re: MkII Archer Automaton

12/28/2016 11:35 AM

Not yet, but I'll see how reproducible it is when it's warmer in the garage, maybe try it a longer range.
I don't expect the point of loose to be very consistent and the arrow isn't optimally matched to the bow either.
Del

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#4

Re: MkII Archer Automaton

12/29/2016 2:32 AM

Totally brilliant.

I would never have the mental energy to make such a device....

Thanks for sharing.

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#5

Re: MkII Archer Automaton

12/29/2016 8:49 AM

Firstly, very nice work. I liked this much!

Secondly (and I understand this could use its own thread, but the context here is good), I find myself using a URL-shortener (specifically, tinyurl.com) to send some of these discussions to friends via cell phone (sometimes email). Anyway, here's the "tiny URL" for this thread: http://tinyurl.com/h9ujhjo

if you do what I do.

Would this be a neat element to add to a discussion page: a tinyurl link? Would this make a worthwhile thread?

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#6
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Re: MkII Archer Automaton

12/29/2016 9:50 AM

I dunno... not sure I even understand... cos I hate telecoms with a passion so I don't use cell phones for anything other than speech and texts.
Del

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#7
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Re: MkII Archer Automaton

12/29/2016 11:21 AM

I just save/send a few thought-provoking or commendable discussions to like-minded friends every week. So, I copy the URL (usually 120+ characters), and use tinyurl to make it ~25 characters long. It makes a random-generated (by default-- you can make up URL if it isn't taken) link address.
So, instead of me sending this:

Check this out!
http://cr4.globalspec.com/blogentry/27911/MkII-Archer-Automaton?frmtrk=cr4digest&cid=nl&et_rid=601485729&et_mid=83355480

I am sending this:

Check this out!
http://tinyurl.com/h9ujhjo

I am often too lazy or unsupported in my desire to make a hyperlink.

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#8
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Re: MkII Archer Automaton

12/29/2016 11:27 AM

Ah, I get it
Cool
Del

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#9
In reply to #7

Re: MkII Archer Automaton

12/29/2016 1:16 PM

On CR4 you can create a simple short link by using the link icon:-

You can say: to see the video go here

Select the word here (above) then click on the link icon, and, paste the URL then click OK:-

Simples!

Brilliant piece of work BTW DEL.

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#10
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Re: MkII Archer Automaton

12/29/2016 1:23 PM

Good, yes. But I want to create a compact link of the thread to share elsewhere (i.e. not on CR4), to direct people to the discussion.

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#11

Re: MkII Archer Automaton

12/29/2016 9:20 PM

Who is the Archer's face modeled after ?

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#12
In reply to #11

Re: MkII Archer Automaton

12/30/2016 6:02 AM

I just whittled it, but I think it looks a bit like me .
Del

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#13
In reply to #12

Re: MkII Archer Automaton

12/30/2016 2:21 PM

I would not characterize you as a block head though.

Very nice automaton indeed. You will put your eye out.

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#14

Re: MkII Archer Automaton

01/03/2017 3:00 PM

Hurrah! Cats rule!

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#15

Re: MkII Archer Automaton

01/06/2017 4:56 PM

Very ingenious piece of machine! Congratulations Del! I got inspired by your work in such a way that I already begin to assembly my own archer based on yours. Now in progress (see picture). I will use a couple of servo motors controlled by an Arduino. Thank you Del the cat!

-p

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#16
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Re: MkII Archer Automaton

01/07/2017 3:43 AM

He looks mean
Del

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#17

Re: MkII Archer Automaton

01/07/2017 4:10 AM

Hi Del,

I cannot remember which far eastern country had "Repeater" crossbows in use a long time ago, but I do remember that you showed us one you made or a video of them being used or similar. (I forget exactly which!)

How about giving your Automaton one of those at some point in the future? Or another version of your brilliant little man?

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#18
In reply to #17

Re: MkII Archer Automaton

01/07/2017 8:33 AM

Yeah, I'd considered that... I'll probably do more work on this version first. Here's the link to the Chinese Repeater.
Del

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#19
In reply to #18

Re: MkII Archer Automaton

01/07/2017 10:05 AM

Thanks for the link.

I also looked on YouTube using "Chinese Repeating Crossbow" and found several great videos of such CrossBows....

Chinese Repeating Crossbows

I am sure some people in CR4 land would like to have a go as well!!

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