I take it that the now internationally accepted is close to the post 1900 standard. This I take it means that those with lathes made in the early 1900 will not (from this) have trouble cutting threads

Awesome. What a concise and detailed rundown. Not only the how- but the *why* a great 20th-century definition of standards finally settled into its final form.

Why 25.4mm instead of 25.0? Well, both the inch and the meter were already established when today's standard was adopted in the 1950s and the 1960s. Both had gone through several refinements before

Send an email: Latheman2@... Ted

Trying to reach Latheman... Fred

I use a Sherline electronic rotary table for cutting gears. One push of the button and you are at the next cut. So very simple, but somewhat expensive solution. Rick

The (international) inch has been exactly 25.4 mm since July 1959. At this point in time the (international) yard was redefined as 0.9144 metre - until this time the ratio between the US yard and the

As long as we’re being pedantic, “... speed of light in a vacuum.”

"'Jon Woellhaf' jonwoellhaf@..." writes: Well, the inch was defined by some ancient king's finger, and the meter by some random planet's circumference... so go blame them :-) And BTW, the

Which begs the question, “Why did they decide to define the millimeter tobe exactly 1/25.4 of an inch? Why not 1/25th?”

"Edward Draper eddie.draper@..." writes: Yes. A 127-to-something conversion essentially converts your leadscrew from "some imperial pitch" to "some metric pitch" (because 127mm is exactly

Round numbers. That is what this is about. Cutting imperial ptiches using an imperial pitch leadscrew, the ratios of the numbers of revolutions required of workpiece and leadscrew is always a nice

Another alternative is to use an IN/METRIC thread dial (METRADIAL) I have one of those for sale. Fits the 9”, 10K, or Heavy 10 Ted

"'m. allan noah' kitno455@..." writes: Well, not *totally* useless, as you need to have it to use that technique (which I use). You just have to use it differently. Also, that technique in

"Kelly Howerton kellyhowerton@..." writes: I had a similar problem with my model 34 and ended up 3d-printing that part: http://www.delorie.com/photos/southbend-lathe/img_3133.html (of course, I

The imperial thread dial is useless with metric threads. You either need to leave the halfnut engaged, or use the technique half-way down this page:

I have a set of metric gears for my 9 but have yet to get counter to sync with them just have to set each cut into the thread. Any simple answers? Thanks

RE: "It was a fun project. Not cost efficient if you plan on selling them. I have seen nice CNC setups on ebay." ...not to mention the solid and hollow 3D printed ones on Youtube by MrPete222 aka

WHEN indexing gear teeth the important is to count...... I screwesd on one gear because I made a full turn instead of 1 3/4 turns. Good practice is to rotate the gear blank with the indexing set- up

Nice projects. Quite ambitious by my thinking. _L_ +++