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| 626 mill riser block |
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| seadog:
I'd echo the concerns about overhang. However, going back to your centreing problem, you should centre at the chuck then move to the far end and adjust with a copper mallet until it runs true there, then back the chuck and adjust etc. etc., until it is running true along its length. |
| John Rudd:
Well after the first cut across the free face, I took the block out of the lathe and put it on a flat face.... The mill table....I ran a clock across the face and theres was less than 2 thou across in various directions, so I guess thats flat enough for re chucking in the lathe.... I also put my 6" square across each face to see how tapered the block was along its length...sure enough the taper was as much as it was running out at the opposite end of the chuck... So back in the chuck, faced end first, reclocked it to within 2 thou at the chuck end and proceeded to turn to diameter, enough just to true it up, faced the other end and its looking good :thumbup: Need to think about what the next step is.... :coffee: |
| John Rudd:
So the drawing calls for some holes to be drilled tapped or clear holes...at either end of the block I'm thinking it best to remove the workpiece from the chuck and mark out where the holes need to be before moving on to boring the recess and forming the spigot at the other end... Does this approach make sense? |
| John Rudd:
Well no advice offered so I went alone as opposed to going it alone...... :) As the lump was now well centred in the lathe, I decided to plod on with the spigot.... Now a well known machinist of these parts and film producer of Sunday Night Cap said to me to check the diameters as the drawing may be incorrect..... So following the venerable sages's advice, I took to removing the topworks off the mill.....sure enough, the spigot on my machine was bigger....cut once measure twice eh? You cant stick it back on....( unless you can weld like Rob or DB.... :bow: :bow: ... Mine looks like pigeon ****...) Anyway after several measurements, I settled on 3.307 or 84 mm thereabouts....Imperial is a bit more precise... After a swarf making session this morning and over lunch I got this far...... |
| John Rudd:
Trouble is if I remove it from the lathe and it doesn't fit because its too tight, I'll have it to cock I mean clock up again..... :Doh: Measure, measure, measure.....I convinced myself that the diameter was going to be ok.....I measured with my trusty caliper, 3.307 inches, measured the spigot on the mill head again, yep 3.307 inches....its got to be right....? Ok, checked with some outside calipers, hmmm...feels good.... So on removing from the chuck, I inched up the mill head, moved it aside and offered up the block.... Oohhh....its gonna be tight... Well it fit like a glove, if anything its a tad tight, I think there may be some high spots inside the socket,where the spigot fits...well, its in now. I'm happy with the result. All the measuring and careful machining paid off.... I just need to remove it now to tidy up the chucked end, machine a socket in it and add all the tapped or clear holes and the nut pockets..... |
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