Discussion in 'Winches' started by haighfam, Apr 25, 2017.
How many feet of 3/8" cable will fill a Ramsey 200R?
Book says 140', I put on 150' & there's 3 or 4 wraps left over.
Disclaimer- I didn't put it on too tight so after it gets wound on under load there would be a bit more surplus.
Thanks, I'll go with 150'
Isn't the cable suppose to be 5/16 not 3/8?
Nope, 3/8" is correct.
Is that specific to the 200R? My MX-200R is listed in the literature from Ramsey as 5/16 diameter.
Just my .02 -
5/16" technically has the working strength, at least 'by the book.'
But ⅜" will take more wear and tear over time.
All my (pto) winches have had ⅜" on them. Personally I wouldn't feel right with 5/16"
But Ramsey may feel a longer length capacity gives a more attractive selling point.
Makes sense. I was just asking what was correct OEM spec for restoration. I put 5/16 on my resto as it was correct spec from Ramsey. I just wanted to make sure I wasn't wrong with my research as to what was originally on the equipment.
I am putting on 150' of 3/8" rated at 15,000 lb working load. Question is, when I double that back to the jeep using a pulley my load rating will drop to 7500 lb, is that right? I just want to make sure I have a safety factor. That shouldn't be a problem just pulling my own rig, but if I encounter a larger vehicle?
You're fine. Assuming you aren't exceeding the minimum bend radius of the cable it actually doubles (provided your snatch block is up to it)- 15k on the cable from the winch to the pulley, another 15k from the pulley back to wherever the cable ends at.
Interestingly the place I bought my cable weren't happy about 3/8" on an 8K winch- they said there wasn't quite enough safety margin but they're used to selling to people who operate man rated systems.
Per gotime lots of people do run 5/16" and do so without issue.
Saw that, they must have revised their spec sheets since the 50's and 60's. I wonder when they changed the spec as seen here http://www.tantel.ca/Images/The Sludge Pile/Winches/Ramsey Winch/Ramsey manuals/Ramsey_04_BIG.JPG
That's a great thread Howard! I didn't even think to look at that when I ordered my cable. I probably would have gone with the old spec anyway since mine probably won't see a lot of actual use since it's all restored.
Side note: I ordered my cable from a local crane company and it's the aircraft grade. I told them it was for an 8K PTO winch and they didn't bat an eye at 5/16.
Using my own website against me?
That just ain't fair!
I don't know if/when the spec changed but the hole on my drum to anchor the cable end is drilled for 3/8".
The actual breaking strength ought to be about 5x the rated Working Load. Safety Factor is built in.
More likely the hardware is the weak point - remember your snatch block will still be seeing the full 15,000# or whatever.
Actually from what I can find the breaking strength of 3/8" cables all seem to be around 12,000 - 15,000 lbs; that jives with what my cable supplier was concerned about. See the document I listed above.
Correct. Which would then make the WL about 2400 to 3000 lbs. per that same document.
Perhaps haighfam was mis-informed by his supplier, or someone who misused the terms
My last comment stands as written. Large safety factors are used. And abused.
But it confirms my gut feeling that 5/16" wouldn't be my first choice.
No ill intent intended. It's just the best example I could find easily for others to understand what we're discussing.
This forum is a great place.
Contacted my cable supplier. Here was his recommendation: 3/8" cable (actually 6x19 wire rope) I installed will have 15,100 lb breaking strength. Working load rating (rolling) will be 1/3 of braking strength, thus 5000 lbs max. For vertical lift working load will be 1/5 or 3000 lbs., if using a pulley for vertical lift, 1500 lbs. Minimum pulley diameter 4" for rated bend radius, but he said 6" would be preferred for constant use. This is a very complex subject, sorry if I started a little controversy. After all the work I've put in this I probably will avoid situations where use of the winch is needed, but it will look good on the spool.
But much more susceptible to wear and tear, am I right?
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