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Construction Equipment Tech Hydraulics, Electronics, General Engineering, ect in constr equip |
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Bruder Cat Excavator Threaded Rod
Hi,
Im trying to convert a Bruder excavator using threaded rod but everything i try seems to fail. The first threaded rod i tried worked but it took forever for the servo to unwind it as the thread was too small. I then tried to use a drill bit but just could not get that to run smooth. Can anyway tell me where i can buy threaded rod with the correct thread for this conversion? Or even better anyone who makes and sells the parts needed to make this conversion work? Thanks |
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Re: Bruder Cat Excavator Threaded Rod
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AKA "00" Biddle RIP FreddyGearDrive 2-12-59/12-19-11 |
#3
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Re: Bruder Cat Excavator Threaded Rod
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Have you had any luck with the threaded rod ? I've done a few builds,along with the bruder excavator with screwdrives,I use 1/2 ,3/8 SST tubing 0.035 wall along with 1/4 wood auger bits ,high torque servos converted to 360 .have any questions feel free to ask. Tommy
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To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Last edited by pumptech; 08-09-2011 at 06:23 PM. |
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Re: Bruder Cat Excavator Threaded Rod
Thanks guys ill have a look at the wood auger bits.
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Re: Bruder Cat Excavator Threaded Rod
Hey pumptech I have been searching for those wood auger bits everywhere but I can't find them. I live in California and they don't have them in any Lowes or Home Depot u have a link to a web page I might be able to order them from?
Also I am looking into threaded rod as an option. But with a geared motor as opposed to servo |
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Re: Bruder Cat Excavator Threaded Rod
Hi,
I tried threaded rod first also, but with some help i ended up doing it this way, please take a look at the link, it may help, or give you some ideas. Happy building http://www.scale4x4rc.org/forums/showthread.php?t=66312 |
#7
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Re: Bruder Cat Excavator Threaded Rod
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also JP if you have any info on your threaded rod attempt i would be interested in seeing what went wrong and what went good. i want to see if geared motors with threaded rod would reduce "slop"(i think thats the term). i seen in your video when changing directions the servo is going for a moment and bit is not moving. also, i want more power/speed. thanks again for response and any info u might have |
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Re: Bruder Cat Excavator Threaded Rod
I dont know anything about making a Bruder screwdrive model but I did briefly have a working Hanomag loader that used screwdrives. In regards to speed, the threaded rods (that drove the lift arms, bucket and to turn) were nice and fast. If I recall correctly, they were 10-32 thread and took approx one second to move one inch. If I understand the math correctly, that equates to approx 480 RPM ((60 seconds for RPM/4 seconds to move one inch) x 32TPI = 480 rpm). Of course, it used 380 sized motors so perhaps would not be practical for a hydraulic cylinder. A metric equivalent would be M5 threaded rod which is approx 31.75 TPI (25.4 mm/inch / .8 thread pitch = 31.75).
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Re: Bruder Cat Excavator Threaded Rod
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Thanks alot! the play is just to do with no weight on it (especially the bucket tip mechanism, at the specific time I took the vid). When the strain is taken off, the rod will move slightly on the drill bit ( unless you use bigger grub screws to fill the gully in the drill bit, but somtimes it can lock up easily) but I wouldn't say it affects the overall function. When I was an absolute beginner and didn't have a clue about hydraulics and screw drives or even R/C for that matter! , I thought a threaded rod might have worked on a servo, after figuring out how to convert them to 360. The main problem was trying to connect the rod somehow to the servo! once I figured out a temporary way to do it using tie wraps or similar, lol! I found that the servo took a life time to even turn the rod a few inches (unfortunately I dont have any vids/pics of my attempts). Thats when I went on the hunt and found out about using drill bits. What exactly are you trying to achieve? surely trying to use a motor you would need room to gear it down etc, would you attach the rod to the servo/motor and a nut to the piece you're trying to move? Happy building! |
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