I bought this machine for £400, the original slew system had failed & been replaced with a system of a Twose farm hoe, this did not really work as far too heavy & slew centre had been brought forward by 21 ins leaving it front heavy. I got dimensions of original kingpost off another owner, did wooden mock ups to prove system as boom ram most be no more than horizontal to clear table, & rear of boom no more than vertical to not foul spool block. Some of you may remember my post here to get my big lathe back gear going
ww.mig-welding.co.uk/forum/threads/braze-steel-gear-onto-hollow-grey-cast-iron-shaft.103336/#post-1774761
Once this was OK I could start machining plates etc. This was how I spent lockdown. I had the original slew rams as spares & the chain. I had to do the math to convert 13'' of ram travel into 180 degrees on a 1.25'' pitch roller chain, this proved to be a 19t if i remember correctly. The original slew design on these machines used a reduced post & a keyway, this was prone to failure so I kept the new shaft as 3'' all the way down with forces from the sprocket being transferred by a 0.5'' cross pin from the sprocket collar
ww.mig-welding.co.uk/forum/threads/braze-steel-gear-onto-hollow-grey-cast-iron-shaft.103336/#post-1774761
Once this was OK I could start machining plates etc. This was how I spent lockdown. I had the original slew rams as spares & the chain. I had to do the math to convert 13'' of ram travel into 180 degrees on a 1.25'' pitch roller chain, this proved to be a 19t if i remember correctly. The original slew design on these machines used a reduced post & a keyway, this was prone to failure so I kept the new shaft as 3'' all the way down with forces from the sprocket being transferred by a 0.5'' cross pin from the sprocket collar