Need Help!- threading mating parts using caps

[forhire]

I designed two mating parts in caps that thread together using a 3.0000-12 UN-2B and 3.0000-12 UN-2A threads. I can get the threads to engage about half a turn. I verified the pitch was correct (0.0833) and the starting id and od have ample clearance. Not sure what I did wrong. I'm not sure how caps calculated the depth of thread (0.0499).

What diameter is caps expecting? I used the nominal 3.0 inches.

Clearly I'm missing something obvious.

Any help is appreciated.

[hernando]

Hello

The information you seek is preseted in the conversational control. Here there is some text directly from the manual.


CONVERSATIONAL PROGRAMMING
USERS' MANUAL
4-3
How to Refer to THREAD HELP FILE

The thread help data consists of the O.D. thread cutting data
and the I.D. thread cutting data. O.D., I.D. and tapered
thread data is registered and can be referred to when setting
the data to define these threads.
The data is accessible and may be registered or changed by
the customer. Up to 16 sets of the data can be registered for
each of O.D. and I.D. thread cutting

1) Press the soft-key [CONVERS PARAM.] on the
CONVERSATIONAL PROGRAM LIST screen
o The CONVERSATIONAL PARAMETER MENUS screen is
displayed.
2) Input "50" (O.D. Thread) or "51" (I.D. Thread).
o The THREAD HELP FILE screen is displayed.
hPress the [PAGE UP]/[PAGE DOWN] soft-key to change
between O.D. thread and I.D. thread data.


And just checking...


Did you check the thread pitch diameter with wires?

Usually the values in the control are close to a truncated thread high calculated by formula given in the Machinist Handbook.

I hope this will help you.

Hernando

[forhire]

Thanks for the help Hernando. I was able to make it work by adjusting the tool offset.

How is the thread help file actually used? Does Caps reference this?

The first two I understand, not sure about the last four.
Nominal
Pitch
Ref. Dia.
Ref. Lng.
Effect. Len.
OD. St. Pt.

Any help would be great.

thanks in advance

[hernando]

CONVERSATIONAL MORI

When a conversational program is created, suitable tools are
selected automatically. It is the tool file that stores in advance
the information on the tools available for selection.

Registered in the tool file are the tool control numbers, types,
dimensions and so on, and this information is called the tool
file data.

If there is no data registered in the tool file, or the tool file
does not contain a tool that matches the conditions, it is not
possible to create a program.


So, in your case it appears that there was a tool with the right pitch
1/12 = 0.083333.

The process has several components.
The tool registration itself where you will describe the tool among others has:


TOOL NAME

ID

TOOL TYPE

RGH/FIN/
COMMON

T CODE

H CODE

ROTATION DIRECTION

POCKET ANGLE

NOSE RAD

POCKET ANGLE

NOSE ANGLE


IMAGIN. TL NOSE

TOOL MATERIAL

Once this is done. You will probably hit TOOL AUTO soft key

When you do this the tool conditions are set.

Here is where the other files come into place by filling the boxes with the info contained on OR FROM

CONVERSATIONAL PARAMETER MENUS
TURNING CUT CONDITIONS
(3) THREAD

AND

THREAD HELP FILE

(50) O.D. THREAD
(51) I.D. THREAD

ALL THIS VALUES ARE PRESET BY MORI SEIKI


Allow me to take you back in the process a bit.

You define or start a process called thread.
Here you describe your

Thread dia 3.0

St point Z 0 (zero or face of part) Could be anything
.
Thread length is (just the actual distance of thread not overall counting from Z zero) this means that if your thread starts at half inch in and say you thread is only one inch long you will type 1 and not 1.5 long adding the value where it starts.

Thread angle 60.

Lead is 0.083333 (This number is sensitive meaning that the amount of decimal you have must match your tool registration number otherwise it will give you an alarm that tool not found)

Hit end of process.

This will take you to a screen full of boxes where you have info that is a combination of your tool registration such as your pocket angle, nose angle, depth cut.

I can tell you that if you want to know how some of these values are calculated go to

Conversational Parameter
Development file
Setting Items for DEVELOPMENT FILE

parameter # 820 Thread, Cycle clearance
Z

parameter # 821 Thread, Thread height
coefficient (%) (O.D.)

parameter # 822 Thread, Thread height
coefficient (%) (I.D.)

#823 Thread, Depth of cut in
last cut

#827 Clearance Z Calculation
coefficient 1

#832 Thread pitch (small)

#833 Depth of cut ratio in the
initial cut (%)

#834 Reference data, Thread
pitch (cutting condition
file)

#835 Reference data, Thread
pitch (large)

#836 Reference data, Depth of
cut ratio in the initial cut
(%)

I am not currently in front of a Mori control. Therefore, I can not specifically answer your questions and I do not want to give you bad info. But I tried to give you some info from memory and from a Conversational Mori Seiki Manual that still have. I hope this explain a bit how they put it together and from where the info comes from.


Sorry for the long info.

Hernando