Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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Default Similariites Betwixt Super Shop and Unimat 3

Similarities betwixt and between Smithy's Super Shop and Emco-Myer's
Unimat 3:

Two column bed ways
Table saw mode
Potential for self-reproduction?

Does anyone here know of more similarities? I ask because a bench
model Unimat 3 travels to conferences MUCH better than its cousin, the
650 pound Super Shop.

I have joined the Foresight Nanotech Institute, which acts to plan
regulated growth of nanotech and avoid "grey goo" and other types of
disasters. I have written and will soon speak with Adrian Bowyer, who
is the central contact for the RepRap project. I have registered and
now mantain a registry for Replikon Research in the US federal CCR,
the Central Contractor Registry.

Cheers, mates!

Doug Goncz
Replikon Research
Seven Corners, VA 22044-0394
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Default Similariites Betwixt Super Shop and Unimat 3

On Sep 3, 12:04*pm, David Harmon wrote:
On Wed, 3 Sep 2008 03:01:46 -0700 (PDT) in rec.crafts.metalworking,
wrote,

Similarities betwixt and between Smithy's Super Shop and Emco-Myer's
Unimat 3:


Two column bed ways


You mean the cylindrical shaft bed of the older Unimat and Unimat
SL? *No, the Unimat 3 has a cast iron bed with an inverted V in
front and a flat in back.


That's right, it was the Unimat and the Unimat SL, as as well as the
NC version, that had twin column bed ways. I remember now...

Doug
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Default Similariites Betwixt Super Shop and Unimat 3

On Sep 4, 6:43*am, wrote:
On Sep 3, 12:04*pm, David Harmon wrote:

On Wed, 3 Sep 2008 03:01:46 -0700 (PDT) in rec.crafts.metalworking,
wrote,


Similarities betwixt and between Smithy's Super Shop and Emco-Myer's
Unimat 3:


Two column bed ways


You mean the cylindrical shaft bed of the older Unimat and Unimat
SL? *No, the Unimat 3 has a cast iron bed with an inverted V in
front and a flat in back.


That's right, it was the Unimat and the Unimat SL, as as well as the
NC version, that had twin column bed ways. I remember now...

Doug


The dual column design, convertible from table saw to drill press,
seems to be the basis for almost all my thoughts on universal machine
tool design lately. I wonder if a lead screw could be run through the
column closeest to the operator in lathe mode. If that were done,
thread cutting would be available and that is one thing the Super Shop
does NOT have.

In such a dual-column machine, of Super Shop scale, might the tubular
bed ways be slotted full length allowing access to a nicely shielded
lead screw, without them springing open with an increase in diameter?
It's a question of residual stress in the steel. Perhaps MSC Direct
can check with the maker of the 2 inch hollow linear motion ways they
sell for me. I have two such bed ways spare from Smithy; when I
complained they were finished to about 16 microinches and were
abrading a fine aluminum dust from the castings of headstock and
carriage, they sent two to me. One each with rack teeth milled in
place, and one without. I'd explained to them I have accessorized my
Super Shop to hold the tubes for hand polishing, hanging from the
headstock in the vertical position. Such bed ways from MSC are $500
each. Smithy provided these two GRATIS! Way to go, Smithy! I'll have
to ask Smithy about residual stresses, too.

Doug
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Default Similariites Betwixt Super Shop and Unimat 3

In such a dual-column *machine, of Super Shop scale, might the tubular
bed ways be slotted full length allowing access to a nicely shielded
lead screw, without them springing open with an increase in diameter?
It's a question of residual stress in the steel.


The residual stresses you could probably compensate for. It's the
reduced stiffness under load that I'd be worried about. Under
bending, I'd expect the slot to open and close as loads are applied.
If there are twisting loads, then either side of the slot may move in
opposite directions axially, giving much less resistance to that sort
of load. Take something like a paper towel core, and expriment with
bending and twisting with and without a slot up the side, I think you
will find the differences are significant, even if it retains it's
shape (which is what I think your biggest worry is with the residual
stress).

I would not be supprised if to get an equivalent stiffness with a
slot, that you'll have to double or more the wall thickness of an
unslotted column. And of course, any deflections in the columns may
also cause sliding assemblies to jam at the most inopportune times...
--Glenn Lyford
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