/diy/ - Do It Yourself

>>2845870
>>2845875
there's no triangles in a coin pantograph :) reduction is done by a single arm like a "lever". where the lever moves say 5 feet at the very end, 90% of the way towards the pivot point, it will move 10% of that, so 6 inches. thus a reduction of 10:1 can be achieved. it pivots both up and down and left and right but the left and right motion is guided by a threaded rod, and moves very slowly like a record player.
my research reveals that a rough cut was done before a final pass, sometimes taking 2 days !?!?!?! pretty sure you could get a good finish in an hour or two. but we shall see.
I've drawn up a lot of plans now.
I am tempted to cannibalize a broken old drill press I have but I may not need to.
>>2845875
>tying the rotation of two disks together seems mechanically tougher
not at all, my plan for the rotating tables is to use a lathe chuck for each one, engraver and follower will be adjustable in height too. the chucks mounted on a spindle will go to a drive gear, then an arm on each spindle, exactly the same length, linked by a rod. that should keep them in perfect alignment. pic rel. quick drawing of what i mean.