Re: Winch Drum

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Posted by Clint Dixon [] on Sunday, May 10, 2020 at 08:50:18 :

In Reply to: Re: Winch Drum posted by Nick [] on Saturday, May 09, 2020 at 23:43:57 :

Both drums, the smooth sided and the ribbed sided, are the same overall length. You would need to disassemble everything and measure the overall length of your drum and compare it to a known drum without any wear. I would be very surprised if you find more than 1/8-inch wear on the passenger side of your drum. Hard to tell from your images.

But the support leg is another story. The part appears to have been cast from a dedicated mold - not simply cast from a one-time sand mold created off an original. If that is the case, there are several possibilities as to what is happening there. Any of these could account for what appears to be at least a 1/4-inch discrepancy between your part and originals.

The pattern maker may have been given a worn or overly machined part to make a pattern from. The pattern could have been made too thin in the center area. The contact surface to the drum may have been milled off too short during the machining process. The rest of the body of the leg could be oversized and the protrusion that appears to be missing from yours could just be lost in the overly large body of the rest of the part. The new part could have warped substantially during cooling.

In any case, adding a spacer in this area is normally not required when all the parts are within tolerance and is kind of a band-aid fix to a potentially bigger problem. If you are okay with that, there is no reason to spend any more money than needed to make it better. A spacer should correct the problem. You probably got the one part that was not quite right.

However, I am concerned. I am talking from the perspective of my job - that is as the Director of Quality Control. There is a slim chance that all of the new legs being produced are dimensionally the same as the one you have. If that is the case, the findings here should be brought to the attention of the company that produced them. They may never discover that the parts are not correct unless a customer brings it to their attention. If the parts were made short in order to simplify production, or to lesson the cost to the customer, and a spacer was needed, then one should have been provided with the part when sold.


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