General Category > Oddball
Strutt Epicyclic Train Clock (maybe?)
kvom:
While waiting for Fedex, I wanted to set up the lathe for threading and take a scratch cut on another bar to verify 12 TPI. I haven't single-point threaded for years, so I needed to reeducate myself.
My Monarch 10EE has a multitude of knobs needed. 1) Rotary dial to select the thread; each setting has 5 different threads in rows marked ABCBC. 2. Turn another knob to select row C. 3. Turn a knob from Feed to Thread. 4. Select Back Gear to allow slow speed with torque. 5. Pull out a knob that unlocks the half nuts and interlocks the carried feed lever. 6. Turn a knob from Feed to Right Hand.
When I did the test I got the second C row threads, which is 48 TPI. After some head scratching, I seemed to remember that I need to swap two of the gears in the headstock, but which two? I posted the question on the Monarch forum at Practical Machinist, where 10EE gurus hang out. Awaiting a reply. Pic of headstock attached.
Jasonb:
I've just been testing an lathe with an Electronic Leadscrew. I won't want to go back to change wheels and levers.
I'd try one of teh other gear lever position as 48 is a multiple of 12. Looking at charts AE gives 12 while BD gives 48
kvom:
You might be looking at the 10EE square dial model which has A-E. The round dial has only one setting for 12 TPI (or most other threads as well). In 1942 they had to relay on gears. The A-C setting essentially double the thread count: 3-6-12-24-48.
If I were to replace the 10EE I'd likely go for a Tormach CNC lathe, especially if I were to restrict myself to maximum 8" diameter parts.
Jasonb:
looking at one of the round dials it looks like the Stud and box gears need swapping over so find a mating pair that are 24T and 48T and swap them.
that would take that pair of the gear train from 0.5 to 2 so you will get 4 times as much leadscrew rotation which will be your 12tpi
Vixen:
Hello kvom,
Having a lathe with either an Electronic Leadscrew, or better still, a lathe modified for CNC is highly desirable. I modified my EMCO Compact 5 to run under LinuxCNC, which as you will already know, is the basis of the Tormach operating system.
The screen shot below shows how I have available at my finger tip a number of different canned cycles for the thread types I most commonly use, both internal and external. Each thread canned cycle is pre-programmed with the correct feed rate (pitch) and corresponding depth of cut. All I need to do is to alter the length of the required thread, everything else is pre-programmed.
The G76 Threading Cycle is very powerful. The single G76 code is followed by a set of parameters which define pitch, length of thread, final thread depth, number of passes, number of spring passes, retract position and even taper angle for tapered threads.
A typical G76 Threading Cycle command can look something like this: G76 P 1.5 Z-10 I -0.1 J 0.1 R1.0 K 0.92 Q0 H2 L1
You may have noticed I have also added several canned cycles for the more common lathe operations: turn, bore, face, taper, chamfer, step etc.
If you ever decide to get a Tormach CNC lathe, you will never regret it.
Mike
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