Tuesday, 3 June 2014

Bringing in the Sheaves

After my lamentations earlier this week about our pulley sheaves that needed repositioning, I was reminded of the American gospel hymn “bringing in the sheaves” and found the original reference in Psalm 126:6 quite amusing: "He that goeth forth and weepeth, bearing precious seed, shall doubtless come again with rejoicing, bringing his sheaves with him.”

Our precious seed was Patrick’s tenacity in attacking a job that required multiple skills (and power tools) that we didn’t have.
The challenge:  move 2 sets of pulley sheaves for the single-line reefing system back along the boom to allow us to tighten down the new mainsail at the first and second reef points.  The photo shows a before and after illustration of the problem.  In the “before” image on the left, the reef point is behind the pulley sheaves, making it impossible to tighten the sail.  The “after” image shows the appropriate positioning.

The pulley sheaves and reef points, before and after.

Step 1:  Calculate where the sheaves need to be.  This was my job and involved lots of hoisting, tugging, measuring, and a little art work.   

The pulleys and their insets.

New placement.

Step 2:  Drill holes to make the rounded ends of the oval insets for the pulley sheaves.  Had to buy a new tool for that one.

Step 3:  Saw between the holes to make the oval insets.  Had to buy a new tool for that one, too.

Step 4:  Pass the reef lines to the new holes and through the sheaves, then rivet the sheaves into place.  We had a rivet gun but it wasn’t strong enough.  The sail maker loaned us his professional one.

Step 5:  Rivet an aluminium plaque over the old holes.  Done !  (On one side; now repeat for the other side.)

We also found a local machinist to weld two stainless steel shackles to our boom gooseneck.  This gives us a better angle for tightening the reef points along the mast.

Two shackles welded onto the boom gooseneck.

In the midst of all this, the new battery charger arrived and was installed.

And now?   How about a little sailing?