Thread: Threading with no chase dial !

Originally Posted by PDW

Try that threading a blind internal bore something like 4 tpi at 120 rpm. Let me know how you get on....

Also put on a fine feed on a long cut and bugger off to do something else. Get distracted and see how you go.

I've used a modern lathe with foot operated spindle brake. Give me my Monarch single tooth dog clutch any day.

PDW

I don't know what you are going on about as the system I have outlined works and works well if you have a suitable lathe. I am not aware of anyone that would need to thread 4 TPI into a blind hole but if anyone did it would be just as easy to stop the lathe at a specific point with a foot brake and a digital readout as a dog clutch .
I for one would put a relief groove at the back of the blind hole to facilitate a stopping point for the threading tool allowing some margin for error .
What has turning on a fine feed and leaving the lathe unattended got to do with cutting threads without a thread dial ??

Originally Posted by Retromilling

I don't know what you are going on about as the system I have outlined works and works well if you have a suitable lathe. I am not aware of anyone that would need to thread 4 TPI into a blind hole but if anyone did it would be just as easy to stop the lathe at a specific point with a foot brake and a digital readout as a dog clutch .
I for one would put a relief groove at the back of the blind hole to facilitate a stopping point for the threading tool allowing some margin for error .
What has turning on a fine feed and leaving the lathe unattended got to do with cutting threads without a thread dial ??

I've used a lathe equipped as you say. Have you used one equipped with a single tooth dog clutch?

I know that you can do things as you state; I've done it. What I am saying is, it's a LOT easier on the nerves to do the same thing with a lathe where the human running it doesn't HAVE to be error-free, *and* you can run at higher speeds, thereby getting a better surface finish. The carriage moves scarily fast when cutting a coarse thread; I've recently been doing 2" OD 2 TPI LH square though fortunately not into a blind hole.

As for the last, the answer is, nothing WRT thread-cutting but this is not the *only* use for the dog clutch. As I said, and if you'd used one you'd know, you can also use it for power feed and therefore can work on something else safe in the knowledge that the feed will disengage at the previously set point. You don't have to stand there and wait to stamp on the foot brake at the correct spot or risk a crash into a shoulder/chuck etc.

I've used both machines and I know which one I prefer. I don't think that you have.

PDW

Originally Posted by PDW

I've used a lathe equipped as you say. Have you used one equipped with a single tooth dog clutch?

I know that you can do things as you state; I've done it. What I am saying is, it's a LOT easier on the nerves to do the same thing with a lathe where the human running it doesn't HAVE to be error-free, *and* you can run at higher speeds, thereby getting a better surface finish. The carriage moves scarily fast when cutting a coarse thread; I've recently been doing 2" OD 2 TPI LH square though fortunately not into a blind hole.

As for the last, the answer is, nothing WRT thread-cutting but this is not the *only* use for the dog clutch. As I said, and if you'd used one you'd know, you can also use it for power feed and therefore can work on something else safe in the knowledge that the feed will disengage at the previously set point. You don't have to stand there and wait to stamp on the foot brake at the correct spot or risk a crash into a shoulder/chuck etc.

I've used both machines and I know which one I prefer. I don't think that you have.

PDW

I don't care that I have not used a dog clutch lathe , I don't want or need one and again your post is not relevant to threading without a chaser dial.
My post was an alternate way to " THREAD WITHOUT A CHASER DIAL " exactly on topic.
I am sure there is lots of ways to do lots of jobs but that does not make me wrong or you the only right one in the thread so what is your problem sport ! You are welcome to use any lathe system you want but don't beat up on people who do it differently to you . I don't need to leave my lathe unattended and it is not hard on my nerves it is easy to do with a foot brake and if you think it's not them maybe you are the one that is missinformed.

Greetings chaps My lathe is a New Visby Australian made. I am not familiar with the makes mentioned in this thread. I have always used a chasing dial and would not have a lathe with out one. I am an Imperial man and have not come across a lathe that cuts metric threads where you can disengage the half nuts. So you have to reverse the beast. My Visby is 3 phase and has a switch to reveres the direction very inconvenient because you have to bend over to reach the switch. There is also no foot stop. When I have to screw cot into a blind hole I cut a thread relief to run into could not be easier. I also don not wander off while the machine is going. I might sit down account of decrepetness Mut I find that one has to be attendance at all times. Finally Whitworth got it right and the French made it more complicated, also the Yanks had to have a slight dibble.
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