Re: My first experiance threading on my 1220 ltd.
- From: "Wild Bill" <wb_wildbill@xxxxxxxxx>
- Date: 13 Jul 2006 16:02:35 -0700
The first attempt at a lot of things can be the most frustrating, but
don't give up completely. Make some threads that don't have an urgent
need to be made, just fer the helluvit. Even if they aren't good,
you'll begin to see what parts of the 1220 machine require more
attention.
I've always thought that dies don't produce great threads. Taps nearly
always produce great threads, but they get real expensive in larger
sizes. HSS cutting tool stock is cheap though.
I have an older 1220XL (bought used), and it was difficult for me to
make any completely predictable cuts at first.
I've had a little lathe training many years ago, and some applied
experience (trial & error mostly, but able to rely on other related
skills) more recently.
These machines are about as far away from manufacturing machines as one
can get, but they will produce worthwhile parts. There were some bad
design problems that I couldn't tolerate (the belt system being a big
one), and I overcame that by adapting a good DC motor and a motor drive
to obtain variable speed.
If your machine's parts are similar to the ones that mine came with,
they can be improved with some effort. Most of the time was spent on
deburring and correcting the fit of everything that moves. A
swivel-cutter hand deburring tool is a great asset to have around.
The drive pulley setup was really bad, with a floating/swinging
intermediate pulley assembly. The pulleys needed to be smoothed and the
sharp edges removed. Placing washers behing the swingarm pivot bolt to
hold the intermediate pulley stationary will help, especially with some
quality belts (slightly smaller length size if necessary).
Those nasty E-clips can be replaced with a longer rectangular keeper
that has a bent tab to pull/push on, instead of digging those little
clips off with a small screwdriver tip.
WB
............
Modat22 wrote:
The first time that I've ever threaded anything on my smithy 1220 ldt
(or any other lathe) was a bit of a pain in the rump. First off, my
change hears are held on with e-clips which where a pain to reinstall.
The gears had burrs in the bores that had to be hand filed and the
belt slippage was terrible at the slowest setting taking .002 cuts.
I did manage to make a beautiful left handed thread (I was trying to
make a right handed thread)
My first thread turning took me 2 hours after all the above problems.
I did manage to finally turn a working right handed thread but the
belt slippage was awful. The belt tension was adjusted to max, I guess
I need to switch to link belts.
From now on its gonna be taps and dies for me.
.
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