On 2011-06-18, DoN. Nichols wrote:
On 2011-06-17, Ignoramus30422 wrote:
I have a Clausing 6913 lathe and have a Enco turret that was designed
for this very lathe.

The turret has tool holes that hold 1.5" round tool holders, using
cams.

The question that I have is, what sort of tooling goes there? Am I
supposed to just make them, with MT3 holes or some such? And how does
one make MT3 holes, with proper reamers?

The sort of tooling likely to be used in a turret of this sort
(which is a bit larger than mine which has 1" diameter tool holders) is:

1) Roller box tool -- turns down a large amount in a single pass.

Special ground HSS or carbide bit which cuts on the end, instead
of the side. Two rollers which act as a travelling steady rest
precisely right for that tool.

Example: eBay # 310283537557

2) Drill chuck on straight shank arbor. (normal chucks, just get
the right size arbor.

3) Floating reamer holder (self aligns).

Expensive eBay example: # 230634528945

Thanks. Would this possibly be usable as a floating tap holder?

4) Geometric style (or other brand) die head -- replaceable
chasers for specific threads -- in sets of four. Feeds onto the
end of the spinning workpiece, cutting threads, then when the
turret reaches its stop, it feeds a little more releasing a dog
clutch, and the chasers retract radially from the workpiece,
allowing you to retract it while the workpiece is still
spinning.

Example: eBay # 130507912832

Very cool. Now that I think about it, I have one such head.

5) Releasing tap holder -- holds tap until the turret reaches
its preset stop for that station, then pulls a little farther
releasing a dog clutch and letting the tap spin freely in the
holder until the lathe spindle is reversed to back the tap out.
(For large holes, there are Geometric taps similar to the dies
except that the chasers retract inward.

Example: eBay # 380337848241

6) T style knurling tool (no examples on eBay at the moment.

Holds two knurling rollers at 180 degree separation, feeds on
from end of workpiece. Straight knurls can produce diamond or
parallel spiral by turning the shanks in which the knurls are
mounted.

Very nice idea.

7) Various things which hold multiple turning tools at once to
turn several size steps in a single feed. (Usually finish cuts
on castings, I think.)

8 -- ?) Things which I have forgotten, or never knew about.

?++) Use your imagination for more tooling.

Tools with smaller shanks can be adapted at the cost of a bit of
metal stock. I've seen sleeves split so they will clamp down firmly
when the cam grips.

One worthwhile thing is a combination workpiece end stop and
retractable center drill.

You really want to have a lever style collet closer to feed
stock through the spindle for multiple parts and cutoffs. (You also
need something to keep that stock from whipping. For smaller or shorter
pieces, PVC pipe can do. All it needs to do is apply enough force to
keep the end of the stock from getting very far off center. Once it is
past a certain amount of deflection, there is nothing that will stop it,
and you want a panic bar to shut down the spindle *quickly*.

Pick up the two volume Moultrecht _Machine Shop Practice_ book
to see a lot about turret lathe work and many other impressive machine
tools.

If you look back through my previous postings, you can find one
or more examples of me describing how I make certain parts in production
mode.

This is very awesome. Thanks DoN. Your eBay-fu is most impressive.

i