Laser-cut Mechanical Claw

If you are worrying about what kind of trick want to show for Halloween this year, or your kids are asking for toys from you, this instructables may help you: to make a movable mechanical claws, the joint of the claws are movable, and its movement are the extension from your finger movement. you can use it to take cool poses, selfie, scratching, picking nose, or give your friends a hand haha... okay, I know that's not funny.

anyway, you may see some projects on instructables and youtube with similiar mechanism and which are awesome, but it maybe hard to replicate one of those. In order to let anyone can make one, we keep material lists simple, and with a lot of picture to help you assembling.

To complete this projects you needs:

• 3 mm MDF board L 600 mm, H 450 mm
• A bunch of rubber band (at least 15)
• Fishing line

Tools:

• Laser cutter - find nearby Makerspace/Fablab
• Hammer

Time:

• 20-30 mins for laser cutting (depends on the laser cutter you use)
• 1-3 hrs for assembling

Ok, so let's get started!

如果你正在煩惱這年的萬聖節沒有甚麼新梗，或者你家裡的小朋友跟你吵著要玩具，或許這篇instructables會對你有幫助: 做一隻霸氣的大手，有趣的是，大手指節是可以活動的，它的動作會是你手指關節動作的延伸，你可以用它來擺pose、抓癢、挖鼻孔、或是當你朋友需要幫忙的時候，你可以Give her/him a hand...好，抱歉我把場子冷掉了。
你或許在instructables或youtube上看過一些類似的玩意兒，但是我敢保證還沒人把整個製造過程、材料準備弄得如此簡單，要完成一隻大手，你只需要:

材料:

• 3 mm 密集板(MDF board) 長 600 mm * 寬 450 mm
• 一包橡皮筋 (至少十五條)
• 一綑釣魚線

工具:

• 雷射切割機 -你得找附近的Makerspace / Fablab 幫忙
• 槌子

時間:

• 切割時間: 約20~30 mins (依使用雷射切割機而定)
• 拼裝時間: 1~3 Hrs

好吧，我知道你已經躍躍欲試了，那咱們就開始吧!

The claws is designed by inkscape, an powerful illustrating software, if you want to modified the file please use the .svg file attached above and editing it in inkscape, but if you simply want to enjoy building the claws, the prepared .pdf file is recommended, noticed that the import .svg file generate from inkscape to other software like Illustrator may generate some problem like changed dimension, so if you do so please check the dimesion or other setting as you cut.

Also, you need to find a place to cut it out, there are a bunch of spaces could help you to do that, for our example, we are fortunate enough to have the place like Fablab Taipei. In fact, the entire designing and prototyping process is done and supported by fablab. we shared it and want to see how you gonna play with it!

這個大手的設計圖是以inkscape設計的，若你要修改檔案請下載svg檔並於inkscape中編輯，若你只想純粹享受製造大手的樂趣，則可以使用我們準備的PDF檔，inkscape的svg檔若用AI等其他軟體開啟時可能會有大小尺寸上的變異，所以切割檔案前檢查一下吧。

再來，你得找個地方把檔案給做出來，這時候我得說有Fablab Taipei這樣的地方實在是太幸福啦，事實上，整個大手的設計到製造，都是我和伙伴們一起在Fablab Taipei這裡完成的，由於Fablab是個強調分享的地方，於是我們就把我們的成果放在這裡眾樂樂啦~上網搜尋看看有沒有甚麼地方是可以幫你把檔案做出來的吧!

There are a lot of little parts for the fingers, and honestly speaking, the assemble process is a little bit complicate - which are the result of under concept of using the most of laser cutter, otherwise, it should be good as well to use some wooden rod as the joint.

手指部分有很多細小的零組件，而且坦白說，組裝的過程有點繁瑣，但我們這樣設計的原因是為了讓大家只需要用雷射切割機-就可以搞定一切零件的概念，不然關節的部分用圓柱形的木棒，也是很不錯的，注意到手指上面的鈎狀設計是為了要固定橡皮筋用的，在等一下我就會提到。

The parts is simpler than fingers, if you find it hard to assemble some of the parts, please use wax to smooth the joints, or using the hammer to force it, SUDO!

這裡的零件就單純一點，我們在設計上為了要達到固定的效果做了一些卡榫，但可能會因為過緊而導致難以將零件插入，如果不順的你可以上點蠟，或是用槌子強制執行，SUDO!

The only thing you need to notice, is that keep the finger bending forward as the normal hands do as you put the fingers into the slots, there is a spike in the middle slots of the finger which restrict the bending direction, you need to keep it on top when you assemble it.

這裡一步驟唯一要注意的地方在於手指與手掌結合的那個方向，如果你逆時鐘去旋轉最後一個指節，你會發現夾在內層的零件有個突起(如圖)，請務必讓這個突起位在手掌的上側，也就是指節前彎曲時的狀態，這個突起的設計是為了讓指節只可往前彎曲。

The rubber band working like a tendon for the claws, it provide the pulling forces, as long as you hook the rubber band as the pictures, and put the fishing thread though the hole we designed, and choose a rings according to your fingers, we made it!

橡皮筋之於大手就像韌帶一樣，提供了連結關節的拉力，只要如圖將橡皮筋在鈎狀處，再將釣魚線由我們設計的孔位穿過去、配合你手指的粗細選擇圓環作為套頭，大手就大致完工啦!

Now you can play it, modify it, improve it, and most of all, you have something to show your friends on halloween!

Surely you can combine it with your awesome costume, my last year halloween costume - for you referecne.

Alright, thanks again for browsing into my instructables, looking forward to see what you made!

This projects is a group project design and modified by: Xintian, Mac Yu and Ted Hung.

你可以針對大手噴漆、改變圖案、甚至將他的動作設計得更流暢，最重要的是，你有個東西可以在萬聖節的時候和你親朋友展示了!

配合一些服裝可能還會更讚喔，附上我去年萬聖節的照片給你參考。

好啦~謝謝收看，也期待大家的作品啦!

This projects is a group project design and modified by: Xintian Chu, Mac Yu and Ted Hung, at Fablab Taipei.