Hi, hope someone can help a neebie before I go meltdown !!.....I bought a
ML7 recently and I'm having loads of trouble setting it up.
I've levelled it up with an engineers level and it now looks spot on. The
chuck is a recon Burnard 3 jaw from Myford....test report = 0.002" rounout
2" from chuck.
The problem is that when I chuck a length of bar it is quite obviously out
of true......I used a DTI...runout is .005" near the chuck and 0.018" at the
end of the 6" bar when rotated by hand.
I've found the mid point at the chuck end and ran the apron to the far end
(without rotating the chuck) and DTI shows no change, therefore I assume the
bed is now straight.
I clocked the nose on the spindle in many positions...no movement apart from
a 0.004" movement right on the end on the vertical surface when rotated and
the DTI horizontal (not on about the endfloat).
There were a few 'bruises' on the spindle threads wheich I gently filed
down...the chuck now goes on a lot easier, whereas it was very stiff
before....the bar shows a slight improvement too.
I tried turning a bar down but it is still wobbling badly on the end of a 6"
bar.....it's as though the bar is bent (which I'm sure it isn't). When it's
turned down it is missing all along the side facing me. I've tried a few
more bars (including a ground test bar)...all clock the same amount. I
have a 4 jaw...would that run true or is there something else wrong?
15 years ago