davedj1
Veteran Member
I am thinking about building a logging winch with a drive similar to a Farmi.
I will have a drive sprocket off the PTO of between 10 and 12 teeth, the driven sprocket on the cable drum will be 60 tooth. The drum diameter is 6" well casing that will be no more than 5" long.
Assuming I will be running at PTO speed of 540 rpm's I take the final gear reduction of 60/10 =6, then divide 540 by 6 = 90, the circumference of the drum is 18.8" so 90x18.8=1692 then divide by 12=141 which is feet per minute.
I understand this will all change based on wraps on the drum, whether I use a 10 or 12 tooth sprocket and whether or not I will be at full PTO speed (most likely not).
Questions:
1) Is my math correct?
2) does that speed sound reasonable?
3) will .250 wire rope be sufficient? ( I have a 500' spool of it) 7x19 ,4000 psi strength. (I think I already know the answer to this one but I have used about 100' of it to yard logs up over a bank via a snatch block hooked to a tree and using my truck to pull them with and had no issues)
FYI: tractor is a Ford 3000 2wd 3 cyl gas with ag tires and a select o speed transmission.
Trees are not that big (6"-18") and I can cut them to any length that works best.
Thanks for the feedback and help in advance
David
I will have a drive sprocket off the PTO of between 10 and 12 teeth, the driven sprocket on the cable drum will be 60 tooth. The drum diameter is 6" well casing that will be no more than 5" long.
Assuming I will be running at PTO speed of 540 rpm's I take the final gear reduction of 60/10 =6, then divide 540 by 6 = 90, the circumference of the drum is 18.8" so 90x18.8=1692 then divide by 12=141 which is feet per minute.
I understand this will all change based on wraps on the drum, whether I use a 10 or 12 tooth sprocket and whether or not I will be at full PTO speed (most likely not).
Questions:
1) Is my math correct?
2) does that speed sound reasonable?
3) will .250 wire rope be sufficient? ( I have a 500' spool of it) 7x19 ,4000 psi strength. (I think I already know the answer to this one but I have used about 100' of it to yard logs up over a bank via a snatch block hooked to a tree and using my truck to pull them with and had no issues)
FYI: tractor is a Ford 3000 2wd 3 cyl gas with ag tires and a select o speed transmission.
Trees are not that big (6"-18") and I can cut them to any length that works best.
Thanks for the feedback and help in advance
David