Diy Internal Threading Tool - Lathe.

[gi_984]

Nice looking tool. Might be useful to have use a small diamond lap or Norton sharpening stone to sharpen it as needed. I'd be afraid I'd screw up if I tried it on a bench grinder.
I was rather intimidated when I had to do my first internal threading job. But I read up on the procedure and reviewed the excellent threading videos on Tom's Techniques.

 

[54hawken]

I use old (or new ) taps held in a boring bar holder. A whole lot easier than making from scratch. Most any broken or dull tap is still plenty sharp on the last half of the tap. An old tap and a pedastal or bench grinder and 20 minutes = a nice hi speed steel tool.

 

[54hawken]

I use old or broken Hi Speed taps reworked by hand on a pedestal grinder. the angle and clearances are already done for you. When done I hold them in a boring bar holder to cut internal threads. I suppose you could make them for OD cutting also. 15 to 30 minutes, no heat treating, done.

 

[pineyfolks]

I was never good at using the dials. I just keep forgetting where I was. I do have indicators on my Lfeed & Xfeed and they work well for me.

You need a threading stop.

 

[epanzella]

You need a threading stop.

.The DI setup on my xslide works well for precision work and also acts as a stop. I don't use my compound for threading so the DI works better than a stop for me. My compound is currently serving as the vertical axis in a home made milling attachment. I only put it back on the xslide for turning tapers.

 

[gi_984]

A hard threading stop will work. But I prefer to use my dials. Faster all around. I find it helpful to use a Black sharpie to put a temporary reference mark on the dial. Becomes very quick with just a little practice.

 

[pdentrem]

I use one of these to align the tool. The scale is larger and easier to set and read. http://www.draftingsteals.com/catal...djustable-computing-trig-scale-triangles.html

 

[stupoty]

You need a threading stop.

View attachment 121131

I saw one of them in an old black and white film about threading, they were using the same lathe I have , cleaned the cross slide and found the hole it went into

I made a simple one and use it every time I thread, makes it very very quick I find as I only have to feed in the compound and the retract is always nice and repeatable.

Nearly as good as the compound retract lever on them hardinge lathes.

Stuart

 

[Brento]

Ok so i have a question. I’m seeing some people say they use old taps ground down. Now could i take say like a 1/4-20 tap grind most of the threads off and keep one point to use as a internal threading tool. And would this tool then work on various thread sizes since its just on tooth left?

 

[stupoty]

Ok so i have a question. I’m seeing some people say they use old taps ground down. Now could i take say like a 1/4-20 tap grind most of the threads off and keep one point to use as a internal threading tool. And would this tool then work on various thread sizes since its just on tooth left?

Hello, You have woken an old thread .

I've seen people say they have good results doing what you say, maybe post a fresh thread people might not notice it hear.

Stuart