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(Ian Sutherland) wrote in
om:

Hi folks, I'm not a turner, but a friend wants me to make some shafts
for him. They have to be turned between centers as part has to be
ground later. Material is mild steel, all shafts have a large end & a
small end. Large end about 3/4", & 3"long, small end (the one to be
ground) 5/8" longest one 8", others a bit shorter.
I plan to cut the material to length & center drill both ends, but if
I use a drive dog, how do I machine where the dog is? If I start with
a longer shaft & part off the stub where the dog was I can't drill a
center exactly on center.
My idea is to cut to length, center drill, machine 5/8" diameter
(leaving 5 thou. for grinding) & machine as much as I can of the large
end, leaving about 10 thou. to go, & then removing the dog & hope that
I can get enough drive from the center to bring the part not yet
machined down to the 10 thou. too big size & finish with a light cut
to size.
Please help with a better (correct) way of doing this.

T.I.A. Ian sutherland. Oz.

Why can you not get a center back on center after parting off the drive
dog area?
You need to leave about 0.01" on the area to be ground anyway (grind
stock)
leave it long enough for the dog, part off, turn it around, indicate it
back in and center drill the end.

--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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