Dear Will,
>From what I remember of the Jennings lead screws they are
case-hardened.
This puts a dent in the one - to five thou cut, huh?
Hal
On Mon, 13 Mar 2006 19:24:30 -0500 "Will Matney" <craxd1@verizon.net>
writes:
> Al's correct. For any who want to try it, the way I used to chase
> threads on a lathe was as follows. First, mount the shaft and bring
> it into round with your dial indicator using a 4 jaw chuck. Next,
> bring the carriage up close to the work, and engage the half nut
> lever while watching the thread dial for the proper place for even
> and odd number threads. Let the carriage run until the tool holder
> is in front of the thread. Stop the lathe and mount the V-tool in
> the tool holder. Push it into the thread until it bottoms out. Make
> sure it is aligned straight into the thread. Note what number you
> dropped the half-nut in on. Back the tool out of the thread and
> watch how far out it takes to clear using a dial indicator behind
> the cross-slide (for example 0.1"). Release the half-nut and back
> the carriage back towards the tailstock out of the thread. Run the
> tool in the amount you noted on the indicator before (0.10"
> example). Start the lathe, and watch for the same number on the
> thre
> ad dial you recorded. Drop the half-nut in on this number and try
> to clean it up first with the tool just tipping the bottom of the
> thread. If this dont work try taking about a 0.0005" to 0.001"
> deeper cut than what the bottom depth is. This being add that to the
> 0.10" example you backed the tool out by. 0.005 to 0.001 inch will
> make the fit of the thread looser but will clean it up. Remember,
> what you take on one side reduces the OD by two times. Keep a set of
> thread wires and a mic handy too. That's about all I can think of
> but using a good cutting fluid sometimes helps.
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