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Hand Crane

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Ian S C15/02/2010 12:11:25
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7468 forum posts
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Neil, go to google images,put in Blackness Castle Crane, and you will see one similar to yours,with a pully at the top of the pole,this could be 1 1/2 to 2ft dia. Ian S C
Stub Mandrel10/03/2010 22:21:39
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That's a bighelp Ian
 
I now have a way forward. I'm trying out a metal supermarket tomorrow, so I'll see if I can get a nice offcut for the base.
 
Thanks Neil
Stub Mandrel31/03/2010 21:55:33
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Well I've made a start!
 

This is the main pillar- about 12" high - it's in three parts. There is a small ball race at the top and one in the middle, to fit in housings which will be the spacers for the frames.
 
The upper part was the first taper I've made by offsetting the tailstock - not as traumatic as I expected, though using a toolmaker's clamp as a driving dog was a bit ugly.
 
The base was a bit of 1 1/2" "hi-tensile something" and a big square of 1/2" aluminium chequer plate, fitted on a spigot. I truned the curve by working out co-ordinates to the nearest 5 thou, then taking it down with a round-ended bit, files and eventually a coarse foam-cored sanding block. The bottom is hollow and an M6 bolt goes into the bottom of the middle and runs into a spigot on the bottom of the top (if you know what I mean).
 
I've got some hellishly expensive 2mm by 10mm BMS from B&Q for the jib, which is 18" long so this is a big model for me, if not a heavy one.
 
Wish me luck!
 
Neil
 
 
 

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