Recent content by rbees

I actually installed a model similar to this one. http://www.autoquip.com/media/239324/Drawings-FLMC%20Freightlite%20Drawing-1.pdf They have several models that employ roller chain to lift several tons. The one I installed was rated at 2 tons and uses 2 #80 roller chains to do the lifting, and...

Where to start. With the chains catching on things. So let's say I build this thing with log chain, in building construction there always seem to be nails and board splinters, or anyone of a number of thing sticking out of the lumber. So loose chains swinging around is not a good thing and so...

Are you acquainted with a small portable cement mixer? The drum/barrel is on a frame and it is designed to have the contents of the drum poured out into something. So let's through away the existing frame and build a new U shaped one that has cylinders or screw jacks of some design, one on...

Thanks Yes I do, but I did not realize that that is what you were talking about. But thanks for the through explanation of how they work. The chain may be cheaper but I have yet to find anyplace to buy the sprockets. You have a US supplier? The Differential sprockets are a good idea...

I would think that a U shaped frame under the your bucket that is pushed up on both sides by hydraulics with a gear motor on one side to do the pouring after lifting would work well. Questions to think on; 1. can you get close enough to the receiving box without some kind of funnel or spout? 2...

Thanks to all. So 1 tooth difference in sprocket size divides by 32? Some how that does not seam right to me. Please explain. Another concern I have is the shaft that will hold the main lifting sprocket. The bearing centers will be 7.5 inches apart. There is not much I can do...

Thanks jack action, You have been much help. I got the formulas fixed in my spreadsheet and now it calculates motor sizes as it should. If I am understanding you correctly this gear box would be suitable for what I am trying to do...

Thanks Baluncore My grandpa actually had one of those now that I think about it. But that won't work very well for me in this app because the drive unit actually needs to climb the chain, not the other way around. Quality #60 roller chain has a 7000 lb tinsel strength. Plenty strong enough...

From my earlier post As far as that goes I do not have to use a 1750 motor. They are common and it theory, cheaper. The mechanical part is NOT the problem. The problem is getting the math on the gear motor right so that I get units that are big enough but not excessively big and heavy as...

Since I didn't mention them, no there are none, besides I have never seen them work well with roller chain ;). Having though about what I want to do and the best way to do it I chose roller chain over wire rope. I considered using screw jacks but getting an adjustable screw length for the...

I am sure my math has problems but this is what I have at this point. Sprocket radius 0.125 feet Lift Weight 1000 Ft Lb torque .125*1000 = 125 Sprocket Circumference 2*PI*.125 = 0.7854 feet Lift Height 16 Lift Time (min) 15 Output RPM 15/(16/.7854) = 0.7363 Input RPM 1750 Gear Ratio 1750/.7363...

Need engineering help -- lifting 1000 lbs 16 feet Ladies & Gents, I am trying to engineer a lifting device. I can build the frame and all that but getting the motor and gearbox sized right is my problem. I am not a math wizz. Some algebra in middle school many many years ago . The load...