NEW Way to Eccentric Turn in a 3 Jaw: Machining a Fly Cutter


so when I got my lathe I got a bunch of
other stuff with it and what a lot of it is I believe is for a larger turret
lathe and I’m not familiar with any of that stuff but what I think this is is a
outside Turner you know it holds a bit in there either
you know at a ninety or at an angle and you can turn the outside of something
with a turtle egg this is an inch and a quarter shank and what I thought I would
do with this would be turning into a fly cutter it’s almost practically as a
flight cutter it would be a reverse rotation but all my lathe tooling is
left-handed anyways so that works for that if I was to turn this down
initially what I was thinking since only having a three jaw Chuck is that wood
shim it with a piece of aluminum to get it to run where I want a hundred and
twenty thousands off of it would be 120 thousand soft Center in this direction
so that was what my initial plan was and then I decided to watch mr. Pete’s shop
tips I believe number 164 eccentric turning and I didn’t realize it but
there’s actually a formula for that and my hundred and twenty thousands of
aluminum would have put me in the wrong spot to have the center of this in line
with this space here so what i opted to do was model it up and 3d print an
eccentric driver dog with you know this would be a
dog to prevent it from turning in there and i could chuck this up in the three
jaw and that’ll run how i want it to run and i also did the opposite side with a
center hole that i can use a center on and make sure that this is
budget rigid and not gonna slide out of here so this piece was printed in 99%
infill and I wanted to just solid as possible when I pressed it in there it
was a made a little bit of cracking sounds but I think it’s I think it’s
pretty good really pretty solid in there this was printed in 80 percent infill
and I just did did it on 80 so it was a little bit less plastic used you okay well I’m gonna go ahead and try it
something I thought about is I should have made this smaller but I wanted to
make sure that this piece was captive and and you really had that secure I don’t know if you could differentiate
that but I think I’m gonna get it try to get it to run a little more true because
this that’s got a taper in it so that’s much deeper depth of cut down here and
pretty narrow over there you my thing about it is so this is this is
more perpendicular and this is more at an angle so it’s out of true I know that
this had a taper in it it wasn’t a perfectly slender full piece but I don’t
know if that just really shows the exaggeration that much or or what but
it’s pretty goofy I’m going to keep going with it well there it is
centric turning using 3d printed bushing or whatever you want to call it stuff
that I learned is so if you’re going to use a center in the tailstock I think
just putting putting that center hole in there with with your tail stock is
probably a better choice than 3d printing it in the in the end piece your
itself then then you know you got it on center after you get it everything all
aligned and everything I briefly threw this in the mill but I think I didn’t
take enough time I didn’t take enough time to make sure that I was running
true before I started turning it down you could see when I was doing when the
interrupted cut was cut and it was you know one side was perfectly straight and
then the other side had an angle to it meaning that it was you know cut and
untrue so you know I think you know this process would work really well if you
were doing a short little parks and stuff like that you could do a split a
split piece so you know it clamps around it and then the you know with it being
split the tighter you tighten the Chuck the harder it would hold this and you
don’t have to have this dog system I was doing some fairly deep cuts and it was
the only thing that I ended up doing was slipping the belt on the lathe not not
any issue with the 3d printed part itself and I am still running the 3d
printed half nuts in the lathe as well so I would call this a success but it’s
got its limitations so I did end up finishing this off with a hacksaw and
then just filed it smooth and scotch-brite on it so I’m pretty happy with the process and
not having a four jaw Chuck this this allows me to do more more stuff that I
couldn’t do before so thanks for watching and don’t forget to subscribe you

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