Re: Unit Cable Hoe
 

Scott I think it's cool how you breath new life into the beloved toys we used to play with.

Who would have ever thought when we were on are knees making motor sounds with our mouths, that years later when we are to old and cramped up to get down on our knees, that we would still play with the same old toys in a whole new way.

Great work on all your "Restorations"

-Mike

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Mike I think you sumed it up pretty good ...It also gives us a good excuse to play with our old toys and not look too foolish lol

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Thank You very much Mike.

Thanks Lou.

I really enjoy converting them and never get tired of running them. :)

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SmallHaul-I will enjoy watching this build! These old machines are my main interest. Do you have any worries over the hi amp draw you will be putting on the servos for track drives? I didn't think servos would handle much continous load.

Re: Unit Cable Hoe
 

Well, here is what I am thinking... The crowd drum on my doepke dragline has enough power to fairly easily pull the entire crane up hill on (free wheeling on its wheels) and that is one 200oz inch servo. So, I figure if I have one 200oz inch servo on each track that should be more than enough power to propel the entire crane up a steep hill. Worst case scenario is the 200oz inch servos are not strong enough and then I'll just have to swap them for Hitec 7955tg servos (well over 300oz inches of torque @ 6volts) that cost $100 a piece. I have one of these servos in my Mack dump truck running the dump mechanism and the servo has so much power that even if you overload the bed with dirt the servo doesn't even sound like it is working hard to lift & dump it.

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WOW... Scott speaks Greek:D:D:D Or at least that's what I am hearing.

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HA! Here is how much power one 200 oz inch servo has.:D

http://www.youtube.com/watch?v=RDJwvo3claI

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That looks powerful enough Scott. You ought to put a ammeter in line to see how much current draw you have.

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Oops..sorry Modelman. the whole time I am thinking power not continuous load.:o

Thanks for the heads up Steve.:o

I'll check the current and post it up. But, I really don't think it will be enough to overheat the servo.

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It's not like you'll be traveling any great distance. So the duty cycle would be down. Do a test on a junk one and try to kill it.

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Well, metering the current under full load dragging the crane up the hill it is drawing .85 amps (850 milliamps). I was surprised, I thought it would have been a little over an amp. I then had the crane drag itself up and down the ramp about 20 times to see if the servo would get hot and it didn't. It barely got warm to the touch. So, the servos might be fine running the tracks but, only time will tell.

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The servos I ordered for the drive are only $11.70 free shipping.
So, if they fail no biggie... They have all metal gears and over 200 oz of torque. From what I read the MG996R's hold up very well to abuse.

http://www.hobbypartz.com/servo-mg996r.html

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11.70 each for 200oz servos!! **** man!!


also that video was awesome!!

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Thanks Dean.

Also, every gear in that servo is metal and it is a digital servo as well. I will disassemble one when I get them and see how well they are made.

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Dragline Wheelie:D:D:D:D:p

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this is what im getting http://www.servodatabase.com/servo/springrc/sm-s4315r
http://www.servodatabase.com/images/...-sm-s4315r.jpg



Torque:
4.8V: 201.4 oz-in (14.50 kg-cm)
6.0V: 213.9 oz-in (15.40 kg-cm)

and are factory 360 robotic servos with J-channel connector. gotta watch some are a square 4 pin connector that i haven't seen before.

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The bucket is made. It is not perfect but, it is the first time I ever brazed aluminum. I used the aluminum weld sticks from harbor freight. I sure learned a lot using it and will be able to do a much neater job the next time I use it. The ears at the back of the bucket will have holes drilled in them for mounting the rear pivot arm. I am surprised how heavy it is now that it is all welded together. I'll probably eventually make a another one out of thinner aluminum and make it neater.

http://i240.photobucket.com/albums/f...ucks/sides.jpg

http://i240.photobucket.com/albums/f.../sidessize.jpg

http://i240.photobucket.com/albums/f...dingbucket.jpg

http://i240.photobucket.com/albums/f...ingbucket2.jpg

http://i240.photobucket.com/albums/f...cketbottom.jpg

http://i240.photobucket.com/albums/f...bucketside.jpg

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This pic shows a better size comparison to the dragline bucket.

http://i240.photobucket.com/albums/f...ks/buckets.jpg

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Scott that looks real good for the first time. Ed

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Thanks Ed. Now I need to make some long nasty looking teeth for the front of it like the real ones have. :D