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  #1  
Old 06-16-2012, 02:42 PM
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Jigglepin Jigglepin is offline
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Default Wooden Excavator

Hello everyone, ( PLEASE JUMP TO LAST PAGE AS I NEED TO UPDATE THE PICS ) (March 2018) cheers

Well, I've decided to continue with my excavator. I started the tracks and bottom section back in february. It took a back seat for a while due to some difficulties with it and building the wooden wheeled loader prototype. With a burst of enthusiasm I then decided to continue with the excavator within the last month

I did a few searches on google images and watched some youtube videos of the hydraulic models.

After looking and studying excavator designs/shapes, different components, I got some ideas and abit more of an understanding on how they operated/moved etc.

So the bottom section was nearly done, it just needed a few things doing with it. I finally figured out how to do the turn table and managed to get hold of some important pieces so that enabled me to complete that section. I also mocked up the boom, stick, bucket size/shape and the thumb/claw.

I'll be doing a servo operated thumb, which I'll make from plastic and also the bucket will be made from scratch this time ( as I got lucky with my loader bucket, which was from the hobby engine loader toy )

I'm thinking about including a front blade with an up and down movement. I know they are usually only found on the smaller excavators but it will come in handy and the way I'm going to do my controls, I'll have 8 proportional functions and 2 on-off switch, so I thought I'd make as much use of them as possible.

So here's what I've got at the moment, I'm happy with the bottom section so that will probably be the final piece and also the turntable.

But really at the moment as it's my first attempt I'll look at it all as just a mock up and see how it goes and get some final pieces made as I go.

I made some more tracks, but I used them on the tracked loader, so I'm using the old tracks at the moment. Here's a few pics of the stage I'm at and how it's looking































I'll get some pics up soon of the bottom section broken down and once I'm happy with the final pieces I'll try and break down the build abit better. Thanks for looking
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Last edited by Jigglepin : 03-29-2018 at 04:09 PM.
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  #2  
Old 06-18-2012, 01:34 PM
d4vew557 d4vew557 is offline
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excellent start, it's looking like another quality build already
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  #3  
Old 06-18-2012, 04:43 PM
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I agree, excellent start on this build ,looks great so far ,kinda reminds me of the john deere with the higher tracks ,keep up the great work ,look forward to the next update.
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  #4  
Old 06-21-2012, 12:08 PM
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Thanks guys

Here's an update,

I broke down the bottom section, as you can it's a similar setup to the loader.
The trickiest part was figuring out the turntable, I managed to get hold of a raptor spur gear after some advise from pumptech , but what really baffled me was working out the mechanism to allow the turntable servo to rotate around the larger gear, but be fixed at both ends to hold each section together tightly .

Just out of the blue, I noticed the brake system on my BMX which worked on a 360 motion! I stripped it down and found the perfect component! and it fitted exactly inside the gear.

I used a hole saw, slightly smaller than the gear to cut some MDF, which I used to raise the gear. I used 4 screws to hold it in place. I sketched and cut out the boom mounting point which is screwed and glued in place.











The next thing was to make the boom and stick pieces again, I started by gettiing some pics of the shapes and sketched them out. It was mainly just by eye getting the right size and it took awhile that is where cardboard comes in handy!

As in the first few pics, that was the mock up piece, I decided to use plastic on this, as I was worried about the final weight! because I'm using servo screwdrives I didn't want all their efforts wasted just lifing a heavy boom. The middel/main part is made from 22mm MDF to give it some strength.

I cut out the rough shapes with a bandsaw, then cleaned them up with a bench sander.

















Thats it for now, thanks for looking!
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Old 06-21-2012, 11:31 PM
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I think very nice projeckt .I am watching you
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  #6  
Old 06-29-2012, 01:10 PM
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Hey guys, here's an update...


Sorry there aren't any build pics of the bucket, at the moment I'm just trying different things so I don't really know how they will turn out and I forget to take pics when I've no idea what I'm doing Thankfully the bucket seems to be holding up! so it seemed to have worked. I've a few more bucket designs I'd like to try, so I'll remember to take pics next time










I've managed to get the main cab shape made, all I need to do now is cut out the windows and door. I'll glue the cab together this time, I'm just using screws for now to hold it in place and to make sure it won't move when I come to glue it.








So this is what I have so far....










Here's a brief discription of how I've done the wiring......

The transmitter I'm using has 6 channels and I'm using 2 receivers. Just in case you are not aware, when both recievers are switched on, they will work at the same time stopping you from controlling 2 models simultaneously.
So to bypass this, you just have to cut the power source to one set of servos. I'll be using five channels, so I'll use my 6th channel to switch receivers.

Receiver 1 (lower section)
1) Not used
2) O/S Track (right)
3) N/S Track (left)
4) Blade
5) Not used
6) Not used

Receiver 2 (upper section)
1) Bucket
2) Stick
3) Boom
4) Turntable
5) Thumb/Claw
6) Servo to switch between receivers

Some pics might help to explain...











So all I've done, is use small futaba extensions and soldered them parallel on a circuit board, then at the end used a half of a futaba lead to complete the circuit again. This then goes through a switch which is then operated by a small servo that is connected directly into the receiver allowing it to always be active.

Here's some vids of it in action!



thanks for looking
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Last edited by Jigglepin : 06-30-2012 at 03:10 PM.
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Old 06-30-2012, 02:13 AM
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Hey

Good job

Quote:
Originally Posted by Jigglepin View Post


Isn't it a homebuilt relay you are showing here ?

Alex
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  #8  
Old 06-30-2012, 03:06 PM
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Thanks Ati, and yes I guess it is
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Old 07-03-2012, 02:12 AM
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Yes it is.
So if someday you need something way more compact, use a relay

I tell you this cause I'll probably use a similar system.

I was thinking about use this wiring.

this wiring is repeated on the 4 other channels, and the 5 relays are controlled by the 6th.

I get 2*(receiver channels - 1) "channels" : 2*(6-1)=10 in this exemple.
You have 11 channels, but mine use only 1 receiver.


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Old 07-03-2012, 06:31 AM
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Very cool Jigglepin ,nice test vid ,looks like the excavator works perfect,has good lifting power ,excellent job on it and the screwdrives
Keep up the great work !!
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  #11  
Old 07-08-2012, 05:04 PM
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The music in the excellent test video... Driver? On the original Playstation?!
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  #12  
Old 07-09-2012, 06:40 AM
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@Ati,

An Interesting idea, but how do you use the 6th channel to control the relay??



@airforceone,

Indeed it is! I was wondering if someone would recognise it
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Old 07-09-2012, 06:42 AM
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Well I've managed to get started on the body and cab.

I made the main body up with serveral parts, angled them and used araldite to hold them together.



















Next was the cab, which was done in the same way, I cut out the individual pieces using a bandsaw then sketched out my window designs. After drilling some 10mm holes in the corners, I used my custom made jigsaw table ( which I show in my tracked loader build ) to cut out the window shapes.

I needed to screw the cab together first, to make sure it fitted ok, then used araldite again and the screws held it in place while the glue dried. I also got round to making a little seat just using simple blocks and shaping them.












I've got abit of sanding to do now with both parts to neaten them up, wil post some pics soon. Thanks for looking
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Last edited by Jigglepin : 07-09-2012 at 02:49 PM.
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  #14  
Old 07-10-2012, 01:35 PM
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Quote:
Originally Posted by Jigglepin View Post
@Ati,

An Interesting idea, but how do you use the 6th channel to control the relay??
Hi

It just needs an ON/OFF. Never touched a radio but I'm pretty sure they can do it

Alex
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  #15  
Old 07-15-2012, 04:59 AM
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Thats impressive work. In those videos the whole machine seems to move very fliudly alot smoother that some of the hydraulic models i've seem and with plenty of power in that arm. 10 out 10 on all accounts, very good work.

I do have one question is the servo that switches recievers conected to both recievers
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