Member postings for Avery Neaman

Thanks to all here, this has just helped me realize that my EMCO 8.6 is missing the "push-pull" knob for changing the feed speeds.

The photos provided are excellent.

The explanations spectacular and so well written!

I appreciate all this.

I shall "experiment" with making a temporary knob, and get to know this part of "my baby" a little better.

I'll also try to create an "album" so I can then begin attaching pictures to my posts.

FOR THE TIME BEING, gentlemen, I do not need you assistance any longer (but I bet I will in the not to distant future!), so thank you all very much, you've been most professional and courteous, thorough, and thoughtful!

Avery

Thank you all for your replies, answers and information. This has been so helpful.

I think Hans had rightfully asked for pictures, but I'm having a bit of challenge finding out how to add pictures that are saved on my computer's hard drive, or my iPhone, I'll work on that next. Sorry.

Note the screwcutting chart (a little out of focus, sorry). If you zoom in you can clearly see the indications of the two feed speeds (0.12 mm/U and 0.05 mm/U). It shows a right arrow next to the 0.12 mm/U and a left arrow next to the 0.05 mm/U.

Here is a summary of what I've empirically observed:

Tumble Reverse Lever Down; Motor Forward => Carriage feeds to right at faster speed, I assume this is the "Coarse" (0.12 mm/U) speed that Hans refers to.

Tumble Reverse Lever Up; Motor Forward => Carriage feeds to left at slower speed, I assume this is the "Fine" (0.05 mm/U) speed that Hans refers to.

I also noted that the spring-loaded "pull knob" which is in the center of the Tumble Reverse lever, does not change speeds from "Coarse" to "Fine."

It simply is a safety interlock such that the knob must be pulled out before the lever can be changed from any position to another. You certainly don't want to accidentally move the lever with an inadvertent hand or arm motion, when the lathe is operating. That would be the end of the change gears and maybe other items.

So in summary, the Tumble Reverse mechanism of this EMCO 8.6 is such that when you operate the Tumble Reverse lever, you are changing not only the direction of the feed, but also the carriage feed speed.

Not reading German, I'm unable to "read up" on how EMCO designed the Tumble Reverse mechanism to work (changing both direction and speed, both at once by re-positioning the lever). But again, by observation, that is how the machine works.

And finally, I assume that since screw cutting is always done at the slowest carriage feed rate, that with this particular tumble reverse design, the Tumble Reverse lever is always in the UP position when cutting threads.

Thanks to all for your input!

Avery

Thanks to all for every cogent and germane reply to my novice question.

Everyone is so generous with their time and information!

It seems like the EMCO yahoo group has now taking place at groups.io, indeed. Furthermore, the group is called EMCOV10lathe. The group is not limited to the V10 machines, but rather is for all EMCO machines. That is my initial take, but don't take is as any gospel, please.

The EMCOMACHINETOOLS.CO.UK website refers to having operational manuals, oh boy , but there are no links to them, as opposed to the active links for parts manuals and EMCO brochures. Boohoo

Han ("Versaboss" has my partial answer to my question: EMCO used two different size tumble reverse gears, thus when both are interacting in the changegear gear train (with the lever in the up position), the leadscrew speed is indeed faster. When in the down position, only the smaller gear is in the train, and the leadscrew is slower.

So as Hans mentions, this gives the lathe more capability (rather ingenious I think) because when simply using the change gears to drive the power feed, the operator has at his or her disposal, two feed speeds, as Hans refers to them as "coarse" and "fine." This being then coupled with the change in direction (that's why it's called "Tumble REVERSE, afterall), and the number of screw pitches that can be cut with this "vocational" machine is doubled! The practicality of that is not understood by me, but initially, I think that the pitches generated with the lever in the "alternative" position would be of no value, unless they coincidentally happen to be Module or Diametral!!

But this doesn't answer my question: Is the tumble reverse lever supposed to be in the up or down ("coarse" or "fine" position, when cutting screws per the screwpitch diagram of the lathe?

If I had the manual (which emcomachinetoos.co.uk apparently doesn't carry, it might answer my question.

So without that, I'll just have to knuckle under and get some experience. I'll cut some test screw pitches with the tumble reverse in the up position, and then the down position, and simply count the threads!

Thanks again to all, you gentlemen are valued and appreciated! You gentlemen are kind.

Avery

New Member here, my name is Avery, Hello.

I reside in the US, Los Angeles.

I have an Emco 8.6. Restoring it now. Can't find any serial number on the old girl, so I don't know how old she is.

So sorry to bother you good folks with such a simple question.

I don't have the "Operator's Manual" for this lathe.

As to Screwcutting, which position should the tumble reverse be in for cutting threads?

This lathe has an visual indication/guidance/reminder cast into the change gear case door. It shows when the tumble reverse is in the up position, less screw threads result. In the down position, more threads result.

I've tested this, and it is in fact the case. No need to reply and question this, please.

The challenge I'm facing is that the screwcutting chart inside of the change gear case, does not indicate which position the tumble reverse lever should be placed in, in order to cut screw threads based on the chart?

For information, the chart has an interesting indication:

It shows an arrow pointing to the right and "0.12 mm/U". Then there is an arrow pointing left, and "0.05 mm/U"

An answer to my question, or any relevant information, would be greatly valued.

Does anyone have an "Operator's Manual" that they could refer me to (or possibly forward a copy of)?

Finally, do any of you good folks know where I should find the serial number on her? She has the four speed Milling Head attached to the bed ways frame. I don't see any nameplate anywhere, except on the motor itself.

Thanks a million!

Avery