Time for an up date.
Moving on from my rudimentary sketch to construct the hoist.
The material of choice was styrene H section for the surrounding frame with styrene strips to form the cross members . Each of the sheaves where made from a combination of .50 mm styrene and 2mm styrene tube . As seen on the real hoist there is a motor drive clutch and drive shaft .This was made up of 1.5mm copper tube and 3mmod aluminium tube with off cuts of styrene to form the motors drives .
The frame for the hoist was measured and cut to size . Parts for the sheaves where made using my �old friend� the leather punch and styrene tube

Once cut each sheave is ready for assembly

With the frame assembled as per the drawing the sheaves where added to either end and a pin inserted through the frame and the centre of the sheave .

Now the critical bit .The reason for maintaining good symmetry on the roof space hoist track becomes very evident when the part built hoist is added for the first time to the rails .If correct the hoist should glide along the track! .

With the roof assembly removed and hoist added

The roof assembly PLUS hoist is returned to the hanger . Like many of these little jobs there is a left and right , top and bottom or to put it into context a right and wrong way round and this hoist is no exception Time to reference the photos just to convince myself that it�s not all a big mistake. Thankfully no . But there is the question of avoiding the large bore feeder pipe work for the fire sprinkler system but that is for later !!!

Now I�m satisfied that the hoist will fit between the rails { and is free to move] the remainder of the outstanding jobs on the drive train can be undertaken.
Hoist and drive train components ready for assembly.

Next step assembly of the drive train.

Once the drive train is fitted together attention shifted to the purchase which is mounted between the flange of the H section of the frame .Like the hoist this can move along the length of the crane . Basically an inverted eye plate fitted to a moving dolly with linkages to the pulley wheels.

The completed drive train is slotted into the side of the hoist frame

�IT fits� only the rigging remains but that will have to wait until the hoist is painted {in bright YELLOW .

More next time ����.
Dave Wooley
