Amps
[Top] [All Lists]

Re: [Amps] Proof of idiocy

To: craxd1@verizon.net
Subject: Re: [Amps] Proof of idiocy
From: HAROLD B MANDEL <ka1xo@juno.com>
Date: Tue, 14 Mar 2006 07:13:42 -0500
List-post: <mailto:amps@contesting.com>
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.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>