Smithy Midas 1220 LTD - Manual (Page 48)

Note: Before starting to machine work set up on centers, check to see the lathe dog tail
is free in the faceplate slot so it won't lift stock off its true line of centers, as in Figure
10.10. Also, be sure lathe centers fit closely into the center holes to eliminate side play
but not so tightly they bind. If you're working on a long workpiece, check it frequently to
be sure the center does not bind. Also, balance unbalanced setups with counterweights
to overcome any "throw" as the work revolves (Figure 10.11).
Figure 10.10 Make sure the lathe dog tail is free in the faceplate slot
so it won't lift off the true line of centers.
Figure 10.11 Counterweights can help with unbalanced setups.
Setting Up Work on a Mandrel
You can machine cylindrical or bored pipe work or cored castings too long to fit in a chuck
by mounting them first on a mandrel (Figure 10.12). Then mount them between centers.
The solid mandrels, which are driven into the hole of the work-piece, must be tight
enough to turn the workpiece against the tool without slippage. Oil them lightly before
driving them into the workpiece. Otherwise, the workpiece may freeze to the mandrel,
making it impossible to remove the mandrel without damaging both workpiece and
Midas 1220 LTD Operator’s Manual
10-5
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Tail of Lathe Dog