Nesbit Grammer

Nesbit Grammer

Lake Ontario Shipwreck - Shannon

Lake Ontario Shipwreck - Shannon

Found by Dan Scoville and Chris Koberstein in Lake Ontario

ROV Ready To Dive In Lake Ontario

ROV Ready To Dive In Lake Ontario

Shipwreck Milan found by Dan Scoville and Jim Kennard

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    Shipwrecks - ROV - Sonar - Projects

    Side Scan Sonar Tow Cable Sheave

    Deigned by:  Dan Scoville

    Machined by:  Dan Scoville

    Goal:  Make a sheave to hold a 0.1875 inch diameter steel cable for towing the side scan sonar.

    I can not take full credit for the design of this sheave.  I patterned it off of a sheave I saw online somewhere but did my own design work after that.  As you can see from the CAD files the sheave can be opened by pulling a couple pins and pivoting the side plate around.

    I stated with two 1/2 in thick pieces of aluminum rough cut into circle to make the sheave wheel out of.  I do not have a lathe big enough to turn the sheave wheel on so making it in halfs was the next best choice.  I cut the outside diameter of each part and then angled the head of the mill over to profile the area where the cable would lay.

    Finally I cut the center hole in the wheel where the axel and bushing will go.  

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    Next I flipped over the side plate and machined out some material to lighten the part up.   The side plates were bolted together and I machined in 4 holes to further lighten the part and make it look better.  

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