Metric Threading on Standard Modern 1334-MIL

[SteamWilly]

Because they’re paying you isn’t a good enough reason? I’ll gladly take those customers from you if you are unwilling to learn how to thread metric. Most of what I do is metric, so it makes no difference to me which system someone wants to use, their money is green either way.

Anyone I can't convince, is very welcome to go see you. The green they give you will NOT pay for the time you waste on metric threads. Unless you have production machinery, I wish you luck with that business effort.

 

[Ischgl99]

Anyone I can't convince, is very welcome to go see you. The green they give you will NOT pay for the time you waste on metric threads. Unless you have production machinery, I wish you luck with that business effort.

The time difference between metric and Imperial threads is negligible when you know what you are doing. Send those customers my way!

 

[epanzella]

Being as the OP asked for help with a metric thread, I don't the answer is telling him to convert to a different thread. That said, the reversing lever is only to reverse the relationship between the spindle and the leadscrew. This should not be touched for this process.
1. turn on the motor in forward to make a pass
2. stop the motor at the end of the pass
3. back out the cutter
4 reverse the motor to get back to the beginning of the cut.
5 re-engage the cutter with the work
6 turn the motor on in forward to make another pass.
rinse, repeat. You never touch the reversing lever or the half nuts. The back lash will take care of itself as you are always cutting in the same direction.

 

[nabison]

Tailstock4 and epanzella, were correct, their process worked. I owe you a beer.

The threads were a little fugly, but the mating part (which i was unable to covert to imperial) threaded in just fine and the O-ring should seal.

Many thanks for getting me out of this jam. This was a big customer (household name) and there was no way i was gonna turn them away.

I just got a used Haas TM-1...i think its time to figure out thread milling...

Thanks again fellas (mine are the aluminum threads on the left)

 

[SteamWilly]

Tailstock4 and epanzella, were correct, their process worked. I owe you a beer.

The threads were a little fugly, but the mating part (which i was unable to covert to imperial) threaded in just fine and the O-ring should seal.

Many thanks for getting me out of this jam. This was a big customer (household name) and there was no way i was gonna turn them away.

I just got a used Haas TM-1...i think its time to figure out thread milling...

Thanks again fellas (mine are the aluminum threads on the left)

Glad you got it to work out!

 

[Ischgl99]

Tailstock4 and epanzella, were correct, their process worked. I owe you a beer.

The threads were a little fugly, but the mating part (which i was unable to covert to imperial) threaded in just fine and the O-ring should seal.

Many thanks for getting me out of this jam. This was a big customer (household name) and there was no way i was gonna turn them away.

I just got a used Haas TM-1...i think its time to figure out thread milling...

Thanks again fellas (mine are the aluminum threads on the left)

Are the threads on the part on the right tapered, or is that just camera distortion?

 

[nabison]

They are in fact straight...i had to check, because the camera sure makes them look tapered!

 

[rronald]

"THREADING IS THE ONE IMPORTANT THING THAT ALL THE "METRIC YAMMERERS" IGNORE WHEN DISCUSSING THE SUPPOSED SUPERIORITY OF THE METRIC SYSTEM."

An interesting point of view that I don't share. If you buy a tool that makes one approach easier and one harder, it seems wrong to blame the thread specification for making things more difficult. In most of the world, excluding the US, a lathe will have a metric leadscrew and the user will find that cutting metric threads is easier than English threads. It's the downside of an English-threaded lead screw that makes metric threading more difficult, not any flaw in the metric system of measurement.

I have an Electronic Lead Screw (ELS) on my lathe, which makes cutting threads of either type equally easy.

 

[markba633csi]

With a metric leadscrew is using a thread dial once again possible?
I have to plead ignorance here, I don't know

 

[Huub Buis]

With a metric leadscrew is using a thread dial once again possible?

A metric lead screw can cut metric threads using a thread dial. There is a chart that shows at witch positions the thread dial can be engaged. It is the same as when using an imperial lead screw for imperial threads.
I have seen some sophisticated thread dials (DIY) that can be setup for metric and imperial threading using the same lead screw.

I just got a used Haas TM-1...i think its time to figure out thread milling...

I use lathe inner turning threading bars (IR11, IR16) to do internal and external thread milling on the CNC router. Works great, especially for large diameter threads. For small diameter inner threads, the rather expensive thread mills are the solution.
The SNR0008K11 is the IR11 holder that has the smallest minimum bore diameter of 11 mm.
There are also IR08 and IR06 inserts, rather expensive but still cheaper than a thread mill.