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Sheet, Medium steel plates, Steel wire rods, Deformed bar, Steel billet, HR sheets

Two-Stage Tentacle Mechanisms Part III: Putting It All Together

Wed, 20 Oct 2021 19:01:00

Welcome back to the final chapter in our journey exploring two-stage tentacle mechanisms. This is where we arm you with the tools and techniques to get one of these cretins alive-and-kicking in your livingroom. In this last installment, I’ll guide us through the steps of building our very own tentacle and controller identical to one we’ve been discussing in the last few weeks. As promised, this post comes with a few bonuses:

29323707092_28d8bd1eb8_zNothing like a fresh batch o’ parts.

Design Files

  1. The Almighty Bill-o’-Materials
  2. Vector Drawings for laser cutting
    1. DXF files pre-offset (0.003″)
    2. DXF files original
  3. STL Models for 3D Printing
  4. Original Tentacle CAD Model Files
  5. Original Controller CAD Model Files

Depending on your situation, some design files may be more important than others. If you just want to get parts made, odds are good that you can simply cut the pre-offset DXFs from the right plate thicknesses and get rolling. Of course, if you need to tune the files for a laser with a slightly different beam diameter, I’ve included the original DXFs for good measure. For the heavy-hitters, I’ve also included the original files if there’s something about this design that just deserves a tweak or two. Have at it! (And, of course, let us know how you improve it!)

Ok, now that we’ve got the parts on-hand in a pile of pieces,let’s walk through the last-mile tweaks to making this puppet work: assembly and tuning. At this point, we’ve got a collection of parts, some laser-cut, some off the shelf. Now it’s time to string them together.

Tipping our Hats to the Hallmark of How-Tos

In the last year, both the Crazyflie assembly instructions and the Formlabs printer maintenance docs have done something novel with their step-by-step instructions. They’ve mixed video clips into their instructions to better showcase a process. Whether that’s sliding a motor onto a quadcopter frame or sliding the build platform out of the printer for cleaning, these clips nail exactly one thing: the specific steps of a short process. In writing these docs, I’m tipping my hat to these folks who showed me just how informative a well-timed video clip can be.

All right–let’s get started!

Controller Assembly

Each Controller is basically two pulleys rotated and stacked on top of each other. We’re assembling everything ourselves here, but don’t fret–I’ll highlight the details to get you feeling comfortable enough to build one at home. (Curious to know why I opted for a mechanical solution? Check out Part II in this series.)

1. Assemble 4x Pulleys

To get the order-of-operations right, have a look at the quick clip on the right. Unfortunately, those parts won’t just install themselves! Getting those parts installed is a matter of using the right tool.



  • qty 2:  4-40 threaded heat-set inserts
  • qty 16: M2 threaded heat-set inserts
  • qty 44: 9/16-in long 0.125-in diameter semitubular rivets
  • qty 8: outer_pulley_plate
  • qty 8: inner_pulley_plate
  • qty 16: 612K-ND angle brackets
  • qty 16: 3/16-in 4-40 buttonhead socket cap screw
  • qty 16: small washers


  • rivet press (or handheld riveting tool) for semitubular rivets
  • soldering iron

Detail: Rivets

I’m using a miniature rivet press in my home shop, but you may be able to score some time on one at your local hackerspace.

Detail: Heat-Set Inserts

Getting the heat-set inserts into your part may seem a bit daunting, but it’s actually fairly straightforward. With the soldering iron set to 250 C, gently work the inserts into the part. Don’t press down on the iron! Instead, gently wiggle the tip, and let the weight of the iron work the insert into the part. Each insert takes about 15-20 seconds to set, so don’t feel too hasty!


Detail: Wire Clamps

To get the order of operations right on this feature, have a quick look at the assembly video. Keep in mind that the wire rope will slide between the washers and the upper angle bracket in a later step.

2. Install Inserts in 3x Pulley Plates

Heads-up! Three of our plates have several insert features. Warm up that soldering iron again; it’s time to get a few more satisfying thrills whilst melting brass into plastic. I’ve called out each “screw-thread-insert” (STI) location in the diagram below. These holes have been sized to specifically accommodate the heat-set inserts.



  • qty 40:   4-40 Heat-Set Inserts
  • qty 2: top_pulley_plate_insert_side
  • qty 2: top_pulley_plate_screw_side
  • qty 2: bottom_pulley_base_plate_insert_side

Installing these inserts is just like we did previously for the pulleys. Give yourself a few minutes to complete these, but be gentle as before.

3. Countersink Bracket Plates

These plates will be the main junction between a controller’s upper and lower pulley. Create countersinks in the following locations.countersink_callouts


  • qty 4: handle plates
  • qty 4: joint_connector_outer plates


  • Countersink + Countersink Cage and hand drill (or drill press) OR
  • Countersink with drill press that has a hard-stop feature

countersinking_delrinDetail: Countersink Depth Tolerances

The screws that slide through the holes in these plates need to engage a threaded insert that’s either one or two plates deep. Countersink these plates such that the screws are, at minimum, flush with the plate. Too deep is OK, as long as the screws don’t bottom-out past the threaded insert.

In more detail, there’s quite a bit of wiggle room on the depth of the countersink, and here’s why. Our plates come in increments of 3.175 mm. Our 6mm screw will engage the threads after passing through 1 plate. Our 8mm screw will need to pass through two plates before it engages the insert in the third plate. What this means is that the total distance of travel for the 6mm screw is two plates’ worth of thickness, or 6.35mm, and three-plates-worth of thickness, or 9.525mm for the 8mm screw. Hence, while the 6mm screw has about 0.35mm of wiggle room, and the 8mm screw has a whopping 1.5mm worth of wiggle room before either screw bottoms out.

4. Join Pulley Sections



  • qty 4:  assembled pulleys
  • qty 2: top_pulley_plate_insert_side
  • qty 2: top_pulley_plate_screw_side
  • qty 2: bottom_pulley_base_plate_insert_side
  • qty 2: bottom_pulley_base_plate_screw_side
  • qty 4: pulley spacer
  • qty 4: joint_spacer
  • qty 4: joint_connector_outer
  • qty 16: 6mm M2 socket cap flathead screws
  • qty 16: 8mm M2 socket cap flathead screws
  • qty 4: shoulder screw
  • qty 2: 8-32 nut
  • qty 4: 3D-printed cable_insert_bracket with inserted ferrules
  • qty 4: .5-in 4-40 female threaded standoffs
  • qty 12: .25-in 4-40 socket cap screws
  • qty 32: 3/16 4-40 button-head socket cap screws
  • qty 16: 612K-ND angle brackets


  • metric allen keys
  • imperial allen keys (I tried not to mix-and-match Jurassic and Metric…. but off-the-shelf components don’t come in every flavor, yo.)


Detail: Order of Operations

For each controller, I’d recommend building up the upper and lower halves separately and then joining them together afterwards. To secure both halves, we’ll be using those classy 612K-ND corner brackets that I mentioned in the previous installment.

Detail: Pulley Bore Diameter Tolerances

The shoulder screws should slide easily through the pulleys. If that’s not the case, feel free to drill them out with a 0.1875″ drill bit.

Detail: VSlot Extrusion Mating Points

Once assembled, these cable controllers can very easily be connected to two rails of Open Builds VSlot 20×20 extrusions. This features lets the user find a controller spacing that’s comfortable for their shoulders.

All right–we’re good to go for the controllers! Let’s move to the tentacle.

Tentacle Assembly

In this next section, we’ll walk through assembling the tentacle and hooking it up to a manual controller.

1. Prep Wheel Hubs


  • qty 18: wheel hubs + set screws
  • qty 18: Delrin vertebrae segments
  • qty 2 x 18: 4-40 x 3-16 in. button head screws


  • Drill press
  • 0.125″ or 4mm drill bit, depending on tentacle core diameter
  • vise

Each vertebrae segment consists of a wheel hub, a delrin plate, and two screws. (Yes, you can put in all four screws if you like, but the last two are unnecessary and just add extra weight.) Fashion yourself 18 of these nuggets.

Detail: Hub Diameter

Depending on what size core you’re using (4mm flexible shaft vs 3.175mm speedometer cable), you may need to widen the hub axle diameter to accommodate the core. By clamping these hubs in a vise, you can drill them out to the larger diameter of choice.

2. Cut Wire Rope to Lengths


  • qty ~25 feet (7.62 m): 1/32″ diameter wire rope
  • qty 4: Wire “Termination-Style” Crimp Ferrules


  • Wire Rope cutters These must be wire rope cutters. Don’t destroy your electronics snippers only to discover that they don’t work :(
  • Hefty Wire Cutters for spring guide only
  • Wire rope crimpers for small ferrules
  • Optional: mini blowtorch
  1. Cut down eight lengths of wire rope each at 3-ft (914 mm) lengths.
  2. Optional: On one end of each wire rope, blowtorch the tip until it becomes white-hot for about 8 seconds; then let it cool. This quick “heat treatment” will prevent that tip from fraying as easily.
  3. Gather up 4 of your 8 cables. On the un-torched ends (or either end if you didn’t blowtorch them), crimp on a “termination-style” ferrule.

3. Assemble Inflection Point Vertebrae


  • qty 4: Wire Loop Ferrules
  • qty 4: uncrimped remaining wire rope lengths


  • Wire crimpers
  1. Gather up the 4 remaining uncrimped wire rope lengths.
  2. On each end, loop the wire through the vertebrae at one four horizontal segments (See image above) and then back on itself.
  3. Slide the loop ferrule onto the rope and loop the short end of the rope back into the ferrule and crimp

4. Prep Upper Stage Cables


  • 8 vertebrae (plus-or-minus a few)30325771952_c503352a27_z
  • qty 4: wire ropes with end-stop style crimp
  • qty 1: speedometer cable or (better) flexible shaft cut to 24 inches (610 mm)
  • qty 4: continuous-length extension spring (aka: spring guide) at 24-inch (610) lengths


  • 1.5mm allen key

Ok, two TODOs in this department: wire and sleeve.

  1. Slide one vertebrae to the tip of your flexible core material.
    With the allen key, secure it firmly to the tip.
  2. Slide the remaining (7) vertebrae into the core 29810238603_3b11dd4862_zmaterial and space them evenly about an inch apart. With
    the allen key, secure then gently. (We’ll secure them down more permanently later.) The core material should fill up with vertebrae for about 1/3 of its total length at this point.
  3. For each of the four wire ropes, slide the uncrimped end from the holes in the top vertebrae down through the corresponding holes of each sequential vertebrae. Remove all the slack such that the ferrule connects with the top vertebrae.

5. Prep Lower Stage Cables with Inflection Point


  • 7 vertebrae (plus-or-minus a few)
  • Inflection point vertebrae with attached wire ropes
  1. Slide the inflection point vertebrae into the core material and secure it gently, evenly spaced just like the other vertebrae.
  2. Slide in 7 additional vertebrae and secure them gently like before. Slide the 4 wire ropes that start at the vertebrae through the corresponding holes in each of the lower vertebrae segments. The total vertebrae count at this point should span about 2/3 of the total flexible core material length.

6. Attach the Base Clamp30377120081_3338928fbc_z

The key to a good puppeteering act is to have the tentacle base rooted down firmly. Right now, I’ve got a temporary solution, an extra square clamp that’s rooted to the base. There’s no magic here, just an extra wheel hub and plate that are both closely butted up against the bottom segment.

7. Adjust vertebrae Spacing/Alignment

Ok, now’s the time to tighten down those vertebrae, but, first, we’ll give ourselves a chance to better align them. For each half of the tentacle, ensure that each segment is well-aligned with its fellow segments in that stage. Loosen and adjust as necessary. Then, tighten down each segment.


8. Sleeve Wire Ropes


  • qty 4: continuous-length extension spring (aka: spring guide) at 24-inch (610) lengths
  • qty 4: continuous-length extension spring at 18-inch (457 mm) lengths (You can cut these with a hefty wire cutter)


  • a hefty wire cutter

Almost there! Our extension spring selection above will become the cable conduit housing in this design. Four cable conduit housings will terminate at the bottom of the tentacle. The other four will terminate halfway up the tentacle at the inflection point, traveling through the lower section along the way.


  1. Slide the four longer cable conduit housings into each of the four longer wire lengths. Each of these housings will slide through the body of the lower tentacle through each of its four large gaps. Slide these cable conduit housings up to the inflection point where they can extend no farther.
  2. Slide the four shorter cable conduit housings into the four shorter wire lengths until they terminate at the base of the wires.

Nice–time to wire it into the controller!

 9. Attach to the Controllers

On our tentacle, each degree of freedom gets two complementary cables and each stage gets two degrees of freedom. On the controller-side, each pulley will join a pair of complementary cables to give that degree of freedom its full range of motion. (Confused? No worries! Check out Part I.)

Now that we have a mess of cables and housings on our hands, go through this mess and pick out each degree-of-freedom’s cable pairs. (Zippy tie them or tape them together temporarily to keep the mess in check.)

For each of these pairs, slide the cable and its complement into opposite 3D-printed conduit holders and string them under the first angle bracket in the pulley’s wire crimp. Take out all the slack on these cables. These need to be tight! That is, keep feeding the wire rope through the wire crimp until the cable conduit bumps into the 3D-printed conduit holder. Screw down the wire clamp for now without worrying too much about tension. Repeat this procedure for each cable pair.

10. Tension Cables

At this point, it might actually help to have the controller dissassembled into the two main components.

From here, with your two hands, apply some tension to the counteracting wire ropes and use one of your partner-in-crime’s two hands to screw down the wire clamp with an Allen key. Alas, this is the second time whilst hacking that I find myself pondering over when they’re finally going to release “third-hand” surgery. (The first case, of course, being soldering… Hand 1 holds the solder. Hand 2 holds the iron. Hand 3 holds the tweezers with the component. Truly, it’s a no-brainer for another arm here.)

29810265613_810607b9b9_zThis method of tensioning works well enough, but there’s a far better method if you’re willing to shell out a bit more cash for components. Instead, I propose constructing internal extension-spring tensioners from two vented screws and a standoff. Simply by unscrewing the vented screw, one can increase the tension along the cable. No third hand required!

For the vented screw jig pictured, I’m using McMaster-Carr’s 4-40 vented screw section, which has a vent diameter that’s just larger than 1/32″ diameter wire rope. This use case finally merits a legit reason to pick up a few of those “vented screws” on McMaster-Carr that I’ve been eyeballing for years every time I land on their catalog’s screw page.

11. Clamp down the Base

Don’t forget: getting that convincing, fluid tentacle movment comes from having the base rooted down firmly such that the entire spine resists twisting at the base. I’m using a small vise that clamps onto the remaining tentacle length to do the trick for now, but this section deserves a bit more design effort. While a vise will totally work, feel free to keep us all in the loop on more clever fixturing methods!


If you’ve made it this far with a sparkling new tentacle to boot–congrats! Now go make an army of 20, rig them up to a few dozen servos, and set them to the beat of some hip 70s disco. For the folks that have read this far, I hope you can take away a few new techniques-of-the-trade that you can bring to your next after-hours, robot design-a-thon. Finally, thanks for joining me in the last few weeks as we tour these strange beasts. Writing these last few posts has been a blast.

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Manufacturer, Trading Company
F22, Unit 1, Ding Tai Building, Huang NI Bang, YuBei Zone,
Switch, Socket, Lampholder, Plug, Junction box
No.6 Jiuwei Road, Danyang Economic Development Zone, Jiangsu Province, China
86-511-6885383, 6968267, 6981256
Lifesaving and fire fighting products
59 Beihuan Road, Huang Cheng, Longkou City, Shandong Province. China
Booster cables, Trouble lights, Indoor and outdoor extension cords, And power supply cords
Simen Town, Yuyao City, Zhejiang Province. China
Power cord, Cable, Extension cords, Cable reel, Power board, Power bar, Plug, Computer contact cord, Cord set, Socket
11 Paiho Road, Shatian Town, Dongguan City, Guangdong Province. China
Touch fasteners, Webbings, Shoelaces, Computerized embroidery and reflecting materials
Rm.103-104, 32 Baohe Road, Nanzhou Street, Haizhu District, Guangzhou City, Guangdong Province. China
Mobile phone and computer accessories, Including Bluetooth headset, Dongle, Chargers, Mobile phone covers, Necklaces, Batteries, Holsters and antennas
ZT Industry Group Co., Ltd.
Manufacturer, Agent
4th FL,Building No.1,Baoshan Industry one,Tangshuiwei,Minzhi,Longhua
Gameboy, Mobile phone, Motorcycle
No. 14, Lane 1, Singren Rd. , Lujhu, Taoyuan, Taiwan, Taoyuan, TW, Taiwan
PDA Accessories, Antenna, Rf Cable, PDA Stylus, Stylus Pen, Touch Pen, Plastic Stylus, Metal Stylus, Screen Protector, Screen Care, PDA Holder
First Sunshine Electronic Ltd.
Corporation/Limited Liability Company
10 / F, China Overseas Building, 139 Hennessy Road, Wanchai, Hong Kong
Camera Battery, Digital Camera Battery, DC Battery, Camcorder Battery, DV Battery, Laptop Battery, Notebook Battery, PDA Battery, Mobile Phone Battery, Cell Phone Battery, Camera Charger, Digital Camera Charger, DC Charger, Camcorder Charger, DV Charger, Mobile Phone Charger, Cell Phone Charger, Emergency Charger, Universal Charger, Travel Charger
Trading Company
Lilinbloon 22 St, Tel Aviv, Israel, Israel
Mobile Phone Accessories, Battery, Playstation 2, Memory Card Ps2, Data Cable, PDA, PDA Accessories, Playstation 2 Accessories, Mobile Phone Parts, Toys, Screen Protector, Housing, Mobile Phone Housing, Mobile Phone Case, Silicon Case, Crystal Case, Mobile Phone Silicon Case, Mobile Phone Crystal Case, Mobile Phone Leather Case
(Office) No. 1101,Fuhao Building,Fuyuan Garden,Block 44
Video and PC game accessories, Repair parts for Sony PSP, PS2, PSX, PS1, Nintendo GBM, NDS, NDS LITE, GBA, GBA SP, GAMECUBE, Microsoft XBOX 360, XBOX and for PC
Suite A290, 2/F, Communication Market, Huaqiang North Road, Shenzhen City, Guangdong Province. China
Game accessories for PSP, NDS Lite, Xbox 360, PS2, IPod, GBM and GBA
JianAn Road
Sports pack for wii, Memory stick for PSP, Bags for NDSL, Memory card for ps2, Cables for xbox360
13 Fanjiang'an Road, Jiangbei District, Ningbo City, Zhejiang Province. China
Violin series, Guitar series, Wind instruments, Piano series, Instrument cases and instrument accessories
Room 407, No.37 Tiyu Road East
Guitars, Music stands, Electric guitars, Electric basses, Accessories
Xingling Road, Shiji Town, Panyu District, Guangzhou City, Guangdong Province. China
Cable trays, Hardware, Warehouse shelf equipment systems
Yancheng Xingtai Electric Equipment Co., Ltd.
Manufacturer, Trading Company
xiao hao north road 19-8,yancheng
Heating loop, Heating wire, Heating tube, High-temperature line, Heating element
Individual (Sole proprietorship)
C / 12, Refinery View Co-Op Hsg Society, Mumbai, Maharashtra, India
Mobile Phones, Accessories, Terminals, Fax Machines, Coin Machines, Stitching Wire And Binding Cloth, All King Of Eyelets, Tents, Shoe Industry, And General Industry, Textile Trimming, Tie-Back, Tassles, Fringes, Beads
Room 3108 , Ren Feng Building ,No.490 Tian He Road, Tian He district,Guangzhou,China.
OA table leg, Table frame, Keyboard tray, CPU holder, Cable manager, Steel leg
3/F, Block A17, Qinghu Industrial Park,Silicon Valley Power,Longhua Town,Bao'an District,Shenzhen City,Guangdong Province.China
SMT products and transformers
Xinhua street yunhe industrial park zhejiang china
Railway set, Wooden bicycle, Wooden easel, Block, Wooden game
126 Dang, First Floor, 1-3 Dexing Road, Liwan District, Guangzhou City, Guangdong Province. China
Designer handbags, Wallets, Mobile phone accessories
Room 207, Block B, Seaview Estate, Watson Road, North Point. , Hong Kong
LCD Projector, Dlp Projector, Projection Screens, Projector Ceiling Mount And Accessories
5/F, Building 5, Section B3, Fuhai Industrial Park, Fuhai Avenue, Fuyong Town, Shenzhen City, Guangdong Province. China
Pogo Pin Connector, Battery connector, Spring connector, Antenna connector, Mobile phone connector, RF coaxial connector, RF connector, Pin connector, Spring loaded connector, Leaf battery connector, Sata, Simcard
321 Marion, Repentigny, Quebec, Canada
Telecom Service
Sultan Orhan Mh.1117 Sk. Otan Is Hani Kat-2 Gebze, ; Kocaeli, Turkey, Turkey
90 262 6447575
Tyco Cable accessories, Heat tracing, Corrosion protection, Cathodic protection
No.555 Chexin Road, Chedun Town, Songjiang
Modular Plug, RJ9, RJ10, RJ11, RJ12, RJ15, RJ45S), RJ45 cat6, UK, PCB Jack, Wired Jack, USB Jack, HDMI, Cable, Terminal
No.651 Hengshanxi Road, Beilun District, Ningbo City, Zhejiang Province. China
Modular plugs
248 Route 25a# 32, East Setauket, New York, United States
Video Conferencing, Wireless Networking Equipment
No. 32, Shengzhao Road, Cixi City, Zhejiang Province. China
PVC films, PVC sheets, PVC binding covers, PVC binding combs, Laminating pouches, Plastic binding covers and plastic binding combs
Room 10B, Jinsui Edifice, 379 Pudong Southern Road, Shanghai City. China
Metal wire products, Industrial fasteners
Binhai Industrial Park,Xiangshan Economic Development Zone
Packing machines, Clips, Wire binding
No. 1 Industrial Park, Fuyong Town, Baoan District, Shenzhen City, Guangdong Province. China
Double loop wire, Wire-O, Plastic spiral wire, Plastic coil, Metal spiral wire, Coil, Plastic binding combs, Rings, Calendar hangers
Merkez Mah. 1026 / 3 Sok. No: 2 Haracci Gaziosmanpasa Istanbul-Turkey, Istanbul, Turkey
Films, Foils, Laminates, PET Film, Aluminium Foil, Copper Foil, Nonwoven Tapes, Slitting, Laminating Services, Packaging Industry, HVAC Industry, Cable Industry
Trading Company, Agent
24 Dr. Hasan Ibrahim St. , Nasrcity, Cairo, Egypt, Egypt
Cable Tie, Sockets, Plugs, Lamps, Cable Ducts, Ilmenite, Cable Glands, Marble, Granite, Woodfree Paper, Offset Paper, 50 Gsm, 55 Gsm, Ilmenite Ore
Some of new proposals from Electrical Equipment & Supplies category
Switch                    Voltage regulator           Cable accessories                   Power cable            Power Plants                  Remote Control Switches                  Fertilizers              Instrument enclosures                 Tees               Battery