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Turned my first pen....
sbwhart:
Q:- When you say - cut your second thread, cut your third thread - how do you ensure that is is 120 degrees around the piece? Do you need to somehow index it?
A:- No you take care of this by advancing your compound by 1/36
Yes, btw, my lathe can cut 12TPI.
Q:- I am really new to machining and
A:- It may be a good idea to try maching up a simple thread with fitting nut just to get you though the learning curve a bit, try somthing like an 12mm thread.
Q:- I am sorry but I don`t understand how the chasers work - do you use them like a cutting tool so the diameter of the work doesn`t matter?
A:- Yes and No the diameter will mater but first have to turn the diameter using a normal tool then set up you chaser
Q....and the bit about cycle threads and your second link totally destroyed me sorry...I did have a search of the net for more info but didn`t get anywhere.
A:- Cycle threads are just like BA or Metric or BSF there just a threads system derivied by the cycle industry but it is no longer in general use but you can still get the taps and dies from specialist suppliers.
Q:- I am happy with your first method if you tell me how I should ensure the threads start at the correct roatations around the piece - really it is just like cutting a single thread three times right?
A:- Yes
Q:- I am more interested about the chaser idea if you can give me some more details? - also the chaser cuts the external thread, but how would you cut an internal thread to match? I appreciate your time for the reply.
A:- I don't think you'll get a ready made chaser to cut 36 TPI you'l have to make your own and a good point to start would be by getting hold of a Tap and a dia by grinding the unwanted bits away you could make your own chasers the tap would make the boring tool or the external tool I've never tried this it just something to experiment with.
We're getting there
When I get my system at home on line again I'll post some sketches
Stew
raynerd:
Ok, I`m with you. I have cut a few threads on my lathe on brass, so I do understand the general idea. As of yet, I have not cut a mating pair, internal and external thread - I think perhaps this would be an idea!!
I`ll give a 12TPI single lead thread a go - my confusion is cutting the internal thread as I need a small internal cutting tool to get into the hole ... I have some HSS so I`ll have a go at making one this afternoon or tonight. Then perhaps once that is a sucess, I`ll give multi lead a try.
Sketched would be most appreciated!
Last question - in terms of a mating pair of threads - what are the calculations for sizes - so for example I have some 10mm brass scrap I can use, can someone give me some exact measurements- internal, external diameters, depth of cut and tollerence? I don`t know how to do any calculations in terms of what will work. All the lathe manuals show you how to "cut a thread" they don`t tell you how you make two threads latch!
Chris
sbwhart:
Chris
Have a look on the down loads you can find all the information you want if its your first time just get the bits to match worry about the rest later. Check your PM
Stew
Bernd:
Chris,
Check your e-mail. I sent you info on two engravers and how to cut multiple threads.
Bernd
raynerd:
Thanks for the info guys - all this looks a little too complex for a beginner. I think I need to ensure my lathe is running smooth and true (which I`m not convinced it is!) and Bogstandard (John) has offered me a visit to his house next week. The intention was that I was going tonight but home circumstance dictates that this week is not possible... I guess I am being impatient as usual but I think I need to wait and speak to someone in person. I can`t just sit on my hands for a week so I think maybe another pressure fit model is in the immediate pipeline.
Thanks for all help so far .... I`ll let you know how things progress and post pictures of mark II as and when it is complete.
Chris
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