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Re: threading

Dennis Turk
 

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OK I know this is going to the group guys.? And yes Dave I did not have my pants on yet."-)))))?? Hay I can sit here and talk to you guys in my skivvies if I wont to."-)))
?
OK to threading.? Here is what I do.? I leave the stock at original diameter as I wont to know were to set my cross slide dial to zero.? After a few heavy roughing passes you will start to raise a burr usually on the left side of the thread on a right hand thread.? Now at this point I drag out my nice new sharp flat bastard file and kiss off the burrs.? I may do this several times as I sneak up on the final pass.? I usually take a number of passes at the end to make sure I have a nice clean thread.? Easy and fast?on a Harding.? Hay every lathe should have a lever operated?cam that move the compound in and out at the start and end of a thread.
?
Before I disengage the half nuts on my Harding? I will?check the?thread?with a nut. ( on a Harding you never disengage the half nuts as the?lathe has a lead screw clutch for forwarded and reversing of the lead screw).??In the case of?acme threads I have masters I have made with my acme taps so I can check a thread before I make up the new nut for? what ever project I am working on.? If it is a standard thread I like to use a grade 8 nut as they are a little more accurate than the cheaper grades.? Dem is da Yellow ones.
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After I have taken my new threaded part out of the lathe I usually will go to my soft wire brush?in my bench grinder and buff the threads.? The last think I do is I usually use my cordless drill and spin the new thread lightly against my bench grinder mounted?gray Scotchbright wheel to kiss of the last of the burrs.? Then in the case of an acme thread its on to big Bertha monster buffer and I give the acme thread a nice polish on the top of the threads.? Again it makes the top sharp edges nice and smooth.?? Ya and you guys that have gotten my lead screws?have made wondered why they were soooooooo smooth working.
?
I know its not fair that I have a Harding to use and the rest of you don't but it was the first lathe I ever used back in 1961 and I have had a love affair with them ever since.
?
Turk
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----- Original Message -----
From: Dave
Sent: Wednesday, May 10, 2006 6:42 PM
Subject: [daltonlathes] Re: threading

Dennis and Jim,
? Thanks for all the threading info. I'm glad it's posted here, cuz I
know I'll be going back to it, and if it's here I'll know where to
look for it.
? Dennis, man, I hope you had your pants on when you posted to the
group by mistake. You wouldn't want to go putting everybody off right
from the get-go! =8-0??
?? So after reading all that I see I forgot to ask about the
beginning diameter of whatever it is I may happen to be threading. Do
you generally take say .005 off the diameter of a 3/8 rod for
instance? A little more off a larger diameter, and like that? And
find out what works best after you've done some threading? Or should
you be able to get a perfect fit by starting out with a 3/8 rod
at .375? I guess I should just take a day and do some threading and
find out, eh?

? So, has anyone come up with a way to keep the oil in the bearings?
I keep paper rags on each side of the foot under the headstock and I
stuff one under the bull gear when I'm not using the lathe to soak up
what leaks out. I've found that the gear guard over the small gear at
the end of the cone pulley can't be canted over towards the end of the
lathe or it won't keep the oil from slinging up the left sleeve of my
shirt. I did get a nice work shirt out of that experience
though.
??
? Interesting off topic(and group for that matter) observation here.
I got an old,seriously rusty,compound off an SB saddle, with a piece
of oak and a big copper dead blow hammer, ( thumb isn't broken, just
some funny lumps where the cartilage in the joint used to be,and I
can even move it a little now!), I got the lead screw out, and
noticed that the lead screw is really worn in the middle, but if I
screwed the nut all the way towards the handle end of the screw,
there is almost no backlash. I'd have thought that the nut would have
been really worn too, being as it should be bronze,
and softer than the steel lead screw,but maybe as this is a WW II
era, no strategic metals, lathe it's made of something else?
?
?? Ok, that's probably enough for one evening, don't want to wear out
my welcome here. Thanks again for the advice.
Dave
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