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  #21  
Old 05-15-2011, 04:47 PM
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Default Re: Bruder Cat Excavator Conversion

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Originally Posted by loie1044 View Post
looking good
Thanks for the compliment.

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Originally Posted by steamer View Post
Tyler. Don't know if you thought about this, but you might try to fill the Bruder boom with expandable foam. Make sure you leave relief holes or it may overfill it. That stuff when it dries is fairly rigid and might do the trick. RC Logger built his boom from blue foam and laminated aluminum side plates and it's incredibly strong.
Rob
Hey Rob. I have seen your idea that you are talking about done before but that just will not sufice to my likings. I have to build this excavator over kill because I just don't want to have any weak spots. I will have some pics of my boom up soon from my afternoon progress.

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Originally Posted by Tamiya Cowboy View Post
Tyler

very impressive work.. you are making me think ill be able to build mine..
Thanks for the compliment bud. I know you can build your's up and have it operatable in no time. The worst part of the build is the beginning of tearing apart an $80 toy. After you get that out of the way thats when things definitely start to change. Just don't look back and take a whack at it.
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  #22  
Old 05-15-2011, 04:55 PM
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Default Re: Bruder Cat Excavator Conversion

Well I have some progress from this weekend. I still have some time left to work so I will be working like a mad man to get some things started on the arm but thought I'd take a break and post up some progress for you guys to look at. Hope you enjoy the pics and I should have another update later this evening if possible. Now onto the pics.

First was the start of mocking up my drives. Here are a couple quick shots.





Now onto the boom.

Swiss cheese sides.



Starting on the supports.



Sides and bottom brazed up.





How the ram will sit.





Some comparisons with the stock and my newly designed boom.









Final stages of the upper and lower supports of the boom on with the ram.









And a final look down the front of the boom.



That is all the progress I have from today and hope to get the arm close to this stage this evening if all goes well.

Thanks for looking.
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  #23  
Old 05-15-2011, 07:26 PM
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Default Re: Bruder Cat Excavator Conversion

Well I have a little more progress for this afternoon so far. I got the sides cut out and drilled for the arm so I can start brazing it up tomorrow after work. I am in the process of turning down all the cross braces and getting it aligned and it will be operatable hopefully soon.

Here's some more pics.







Thanks for looking.
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  #24  
Old 05-15-2011, 07:28 PM
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Default Re: Bruder Cat Excavator Conversion

Looks good Tyler
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  #25  
Old 05-15-2011, 08:09 PM
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Default Re: Bruder Cat Excavator Conversion

SWEET!!! I'm liking this build!
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  #26  
Old 05-15-2011, 08:18 PM
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Default Re: Bruder Cat Excavator Conversion

Thanks for the compliments guys. Here are just a couple shots to see what it will kinda look like once it's together.



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  #27  
Old 05-15-2011, 09:39 PM
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Default Re: Bruder Cat Excavator Conversion

WOW you are killing me! One **** of a job you are doing there Tyler!! I am loving this build..
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  #28  
Old 05-15-2011, 11:18 PM
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Default Re: Bruder Cat Excavator Conversion

Looks fantastic. Are you using soft solder or silver solder on the arms. Look like you'll be digging in no time.
Rob
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  #29  
Old 05-16-2011, 12:17 AM
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Default Re: Bruder Cat Excavator Conversion

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Originally Posted by Tamiya Cowboy View Post
WOW you are killing me! One **** of a job you are doing there Tyler!! I am loving this build..
Hey Paul. Nothing special here that I am doing that I'm sure you couldn't accomplish. Thanks for the compliment. I'm still thinking I need to see a build for your's though. I'm sure I could rummage some help up for you if ya needed it lol.

Quote:
Originally Posted by steamer View Post
Looks fantastic. Are you using soft solder or silver solder on the arms. Look like you'll be digging in no time.
Rob
Thanks for the compliment Rob. I am using silver solder as it is a little better flowing and stronger I've come to realize than simple solder. I hope if all keeps going well that I will be digging by the end of June. I still have a ways to go and this thing is moving slowly.
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  #30  
Old 05-16-2011, 12:51 AM
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Default Re: Bruder Cat Excavator Conversion

Boy it's really coming along!
I have a question. I see that the bolt holding the servo in place seems to go right through the case. Is there room in side the servo for it to clear all the electronics or have you moved stuff to make it work?
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  #31  
Old 05-16-2011, 09:04 PM
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Default Re: Bruder Cat Excavator Conversion

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Boy it's really coming along!
I have a question. I see that the bolt holding the servo in place seems to go right through the case. Is there room in side the servo for it to clear all the electronics or have you moved stuff to make it work?
The servo is only drilled through just behind the pot on it where the casing is hollow. I chose it directly center of the ram and just behind there for the best center pivot point to the actual ram. There is no modification other than what I have done for full rotation to the electronics. I will be using a piece of brass tubing running through with a wrist pin to pivot on like a normal cylinder would so everything will be encased. The screws are just temporary holders and work great.
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  #32  
Old 05-16-2011, 10:53 PM
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Default Re: Bruder Cat Excavator Conversion

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Originally Posted by rockNmayhem View Post
The servo is only drilled through just behind the pot on it where the casing is hollow. I chose it directly center of the ram and just behind there for the best center pivot point to the actual ram. There is no modification other than what I have done for full rotation to the electronics. I will be using a piece of brass tubing running through with a wrist pin to pivot on like a normal cylinder would so everything will be encased. The screws are just temporary holders and work great.
Thanks
I'll have to make note of that modification to be able to use it on some upcoming projects.
The excavator is really coming along and looking good doing it
Jordy
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  #33  
Old 05-17-2011, 12:22 AM
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Default Re: Bruder Cat Excavator Conversion

Wow, i'm very impressed with your fabrication, simply amazing.

I bet Bruder never thought their toys would transform into "working" models such as this

Big John
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  #34  
Old 05-17-2011, 01:10 AM
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Default Re: Bruder Cat Excavator Conversion

Thanks John, I apriciate the compliment and I would assume that Bruder had no idea that us "big kids" would be turning their products into working machines meant to do work. I think it would be kinda interesting to take a video and some pictures of it when it's done and send to them to show what all can be accomplished by their work..... Hmm now I have got myself to thinking.
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  #35  
Old 05-17-2011, 10:26 AM
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Default Re: Bruder Cat Excavator Conversion

Very nice - your servo-cylinders look really great!

BTW, Bruder know quite well that their toys are used by big boys (they told me when I submitted a product suggestion).
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  #36  
Old 05-17-2011, 10:48 AM
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Default Re: Bruder Cat Excavator Conversion

Tyler, that is looking great! What an ambitious build!

Brian
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  #37  
Old 05-30-2011, 12:12 PM
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Default Re: Bruder Cat Excavator Conversion

Well time for an update on this little guy. I got some work done the last couple days to with the weekend off so I thought I'd show some progress. Not a whole lot but its starting to take shape and I can see that this thing is going to need some more power I believe. I was running it back and forth on the arm yesterday with a 10lb weight attatched to it and "SNAP" goes the pot in the servo for the arm. I couldn't believe it but the pot actually snapped apart and the servo went crazy. I shut it down and checked it out and low and behold the tiny fingers inside were all mangled and crossed contacts. So now I'm going to be ordering a stronger servo for the bucket movement seeings as how the 645 didn't really wanna take all the abuse.

Any ways here are some pics of my weekend progress. Hope you like.













Thanks for looking guys.
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  #38  
Old 06-01-2011, 03:57 PM
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Default Re: Bruder Cat Excavator Conversion

Looking really good!
I like the way the servos are hidden inside the boom.
Are you putting the brass booms back inside the plastic ones for looks?
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  #39  
Old 06-05-2011, 02:24 PM
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Default Re: Bruder Cat Excavator Conversion

No, the brass boom will get some more detail and will be all that is seen. I hope to scale it as close the the full size as possible.
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  #40  
Old 06-11-2011, 11:35 PM
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Default Re: Bruder Cat Excavator Conversion

nice stuff....really nice stuff... being new and poor to this hobby and lurking for a few weeks on this forum i was trying to find another way of moving the arms of an excavator and what you seem to have seems to be the ticket... hydraulics seem out of the question.... way out of my range of know how and cost.... my question is where did you pick up those screw type cylinders, if thats what they even are, and how do they work radio wise, do you need a speed control or just reciever.... and while i'm asking questions, how do you make a servo go around and around acting like a drill, i thought they had limits to how far they could turn...

thanks Joe ...i'm really green to all this stuff
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