Another homemade milling machine

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vtsteam:
Improvisation, and making one tool to make another is the name of our game, Dwayne! Looking forward to seeing how this will come together. :beer:

shipto:
Made the base while at work today and fitted the column to it tonight. I could do with a decent square as it seems a tad off but I cant be sure my set square is accurate, however there is one major problem with the 76x38 when its tight it is spreading around the bed at the bottom but not at the top so the head is being taken off square so I either need to use something better or weld something in to stop the bottom spreading.
In pic 3 I show the table in about the position it will be on the knee and the hole in the base is where I am planning to put the lifting screw for the Z axis, I would welcome opinions on wether I should move that forward nearer to the center of the travel? my first thoughts where that the screw should be reasonably close to the column to ensure the knee would move smoothly but I am not too sure now.

vtsteam:
I'd vote for the center of the X and Y travels on their slide ways should be under the axis of the head spindle. And the Z screw also under that point.

vtsteam:
With regard to the channel guide on the head, maybe I might try adding two small plates welded to form a Vee inside the channel legs, so the pillar now slides against that Vee. Each plate would weld to a leg, and to the channel center line, inside.

shipto:
The center of the X and Y will be under the spindle axis to maximise the cutting area. Looking at most of the milling machines on a Google image search shows me manufacturers don't seem to have any rules regarding the position of the lift screw. However my machine is no where near the weights they are dealing with so under the spindle axis seems reasonable to me too. As for the head I think I am going to trap a block between the column and the channel for now and sort it out properly later. Now it is annoying me as the plan for the Drummond bed was to one day make it into a decent and saleable lathe again but I am liking the way this is going so much that it's unlikely I will change it now. So sorry to anyone who was following me while I wasted time up to now.

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