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muddstopper
Veteran Member
Ottawa aint exactly local to me, but for a circlesaw processor, the price doesnt seem bad.
Any body built a knuckleboom loader
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Ottawa aint exactly local to me, but for a circlesaw processor, the price doesnt seem bad.
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muddstopper
Veteran Member
Well, I may of scored. Yesterday when heading home from SC, I was running some back roads cutting actross to hit the interstate. I saw a bunch of old bucket truck, and mechanic trucks setting off the side of the road. I made a quick Uturn and headed up the driveway. Young guy was walking out of the shop and I asked him if any of the old stuff was for sale. Of course, everything was for sale. They had a digger crane that had been dismantled and where selling parts. I asked about the base and swivel and yes it is for sale. Owner wasnt there at the time, so I left number. Hope he contacts me today. Parts are super heavy duty for what I want, but can easily be modified if the price is right.
And, I just got shot down, guy wants $1000 for just the swivel. The young guy told me the owner was scrapping and I was expecting a scrap price. Now if i needed the swivel to do what it was designed to do, without any modifications, I could see the $1000 and even consider it cheap.
And, I just got shot down, guy wants $1000 for just the swivel. The young guy told me the owner was scrapping and I was expecting a scrap price. Now if i needed the swivel to do what it was designed to do, without any modifications, I could see the $1000 and even consider it cheap.
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dcomp
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muddstopper
Veteran Member
My original plans where to use a backhoe attachment off a ditchwitch. I bought a a620 attachment with plans on flipping it upside down to place the knuckle up high. Everthing was there, but it had it drawbacks, mainly weight. The attachment weighed 3000lbs and I just couldnt figure out a way to refab it and put it on a diet. Guy drove up into the yard the day before I started this thread and wanted it worse than I did. I made $500 profit and figure i would just use the money to build from scratch. I am still considering a backhoe swing assembly and think I have one located, but the boom and outriggers are just to heavy.
mikefromnh
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muddstopper
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Now that i could work with, but its a long way to Maine. I wonder if thats homemade or a factory build loader. Looks almost homemade, but is certainly not as heavy as some of the factory loaders built for logging.
mikefromnh
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It looks to be a john deere re-branded gafner loader.
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muddstopper
Veteran Member
I think I have a plan so I will throw it out to get opinions and ideals.
I think I can use a splindle and hub off a 40,000lb truck axle. That should give me 20,000lb of side load strenght. I will cut the axle tube and spindle assembly from the axle housing to get rid of the big round center section. I will use the tube to weld on supports to hold the spindle upright. After removing the brake drums, brakes, everything but the hub, I will use the wheel flange to build my boom mounts off of. At the bottom of the wheel flange i will mount a large #100 sprocket. Actual size I havent figured out yet, but am considering a 68tooth for gearing. I will most likely use a stator rotor orbit motor with appropriate sprocket for turning. I dont need or want 360* turning, so i will weld some stops to prevent the boom turning all the way around.
. The problem here is the dia of the #100 sprocket which is around 22inches. A #60 68th sprocket is about 16in in dia and has a tinsel strenght of 8500lbs. A #100 roller chain has a tinsel strenght of 24,000lbs, but factor recommendation is to use a factor of 6:1 when determining actual strenght needed. If I use a double #60, I am still less than the strenght of a single 100 at 17,000, but a triple roller would be 25,500lbs. I am considering the triple #60 because of dia of the large sprocket. Sprockets aint cheap, a 68th #100 sprocket is around $750. What has me puzzled is how much force is actually needed to turn a 16ft boom with a 1500lb log suspended from it. I am pretty sure I can hand turn a 16ft boom holding a 1500lb log, so i am guessing it doesnt take that much power to actually spin the boom. I also know from experience that a huge log suspended from a boom can snap a #100 turning chain. I am just guessing, but the boom that snapped the chain had the log help up by a cable and the whiplash of the log swinging probably would put more force on the boom than a log that was held tightly in a grapple. This was on a old Kennemer cable log loader if anyone here has ever been around one. Similar to a BigStick but chain driven instead of cable/cyl turn.
Boom cylinders will be 3in bore at 3000psi. This will give me 10ton of force for lift and keep me within capacity of the spindle. Length of stroke has yet to be determined. For a grapple, I will probably build my own but am considering a Valby rotator, R30 if memory is correct. Last time I checked, I think the rotator was around $700, but I could be wrong on those numbers.
Most of the stuff i have on hand, but buying the sprocket and rotator, and possibly a couple of cylinders, I should be less than $2000 in the boom. Yea, right,, I'll see how that turns out.
I think I can use a splindle and hub off a 40,000lb truck axle. That should give me 20,000lb of side load strenght. I will cut the axle tube and spindle assembly from the axle housing to get rid of the big round center section. I will use the tube to weld on supports to hold the spindle upright. After removing the brake drums, brakes, everything but the hub, I will use the wheel flange to build my boom mounts off of. At the bottom of the wheel flange i will mount a large #100 sprocket. Actual size I havent figured out yet, but am considering a 68tooth for gearing. I will most likely use a stator rotor orbit motor with appropriate sprocket for turning. I dont need or want 360* turning, so i will weld some stops to prevent the boom turning all the way around.
. The problem here is the dia of the #100 sprocket which is around 22inches. A #60 68th sprocket is about 16in in dia and has a tinsel strenght of 8500lbs. A #100 roller chain has a tinsel strenght of 24,000lbs, but factor recommendation is to use a factor of 6:1 when determining actual strenght needed. If I use a double #60, I am still less than the strenght of a single 100 at 17,000, but a triple roller would be 25,500lbs. I am considering the triple #60 because of dia of the large sprocket. Sprockets aint cheap, a 68th #100 sprocket is around $750. What has me puzzled is how much force is actually needed to turn a 16ft boom with a 1500lb log suspended from it. I am pretty sure I can hand turn a 16ft boom holding a 1500lb log, so i am guessing it doesnt take that much power to actually spin the boom. I also know from experience that a huge log suspended from a boom can snap a #100 turning chain. I am just guessing, but the boom that snapped the chain had the log help up by a cable and the whiplash of the log swinging probably would put more force on the boom than a log that was held tightly in a grapple. This was on a old Kennemer cable log loader if anyone here has ever been around one. Similar to a BigStick but chain driven instead of cable/cyl turn.
Boom cylinders will be 3in bore at 3000psi. This will give me 10ton of force for lift and keep me within capacity of the spindle. Length of stroke has yet to be determined. For a grapple, I will probably build my own but am considering a Valby rotator, R30 if memory is correct. Last time I checked, I think the rotator was around $700, but I could be wrong on those numbers.
Most of the stuff i have on hand, but buying the sprocket and rotator, and possibly a couple of cylinders, I should be less than $2000 in the boom. Yea, right,, I'll see how that turns out.
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muddstopper
Veteran Member
No opinions on this plan???
mikehaugen
Elite Member
The only thing I will say, I may have mentioned it before, but the 20,000 rating per side is a straight rating where the load is likely centered between the bearings. What you are suggesting is putting a leverage type load. Not saying it won't be strong enough, but I don't think I would use 20k for the calculation. I liked you idea about putting a lower bushing in as it should help counteract the twisting force to some degree.