"Ignoramus22698" wrote in message
...
On 2011-09-06, Ed Huntress wrote:

"Ignoramus22698" wrote in message
...
On 2011-09-06, Larry Jaques wrote:
On Tue, 06 Sep 2011 09:46:04 -0400, Randy333
wrote:

On Sun, 04 Sep 2011 19:47:32 -0500, Ignoramus30787
wrote:

I love the concept expressed in this auction, what a great idea!

http://www.ebay.com/itm/170691977589

I want to make my own now...

i
$1800 and the rotary table and vise is not included. Seems pricey.

NO kidding. I'll bet Ig makes an equivalent for under $300.


Yes, it does not seem to be very complicated. Some welding, some CNC
machining, not really that much seems to be involved. Just three large
pieces of iron is what is needed.

i

Do you have a CNC rotary table, Ig? They're far more useful than a
trunnion
for accurate work. Trunnions are basically production tools with multiple
sets of fixtures; unless you get into the really expensive ones, they
aren't
generally high-accuracy devices.

Yes, I do, I think that I showed it and how it turnsto you, but
perhaps the beer interfered.

Yeah, I thought you had one, and it's pretty substantial.


The Haas trunnion with a vise never looked like it made a lot of sense to
me. It isn't good for fixturing multiple parts and it doesn't seem to
offer
a lot over a vertical rotary table, unless your particular part
configuration just can't be set up on the table itself.

On the other hand, a rotary table that can be set up vertically can be
very
useful in a small shop.


This is what I have.

http://igor.chudov.com/projects/Brid...y-Table-U12PNC

i

Think about what you can fixture on that, set up vertically, with a
right-angle plate on the table. Compare that to what you can mount in a vise
on a trunnion. I don't think you'll see much difference. If you're thinking
of one-off jobs, getting a part set up accurately in a vise probably takes
as much time as setting up on the angle plate. If you're thinking of batch
work, a little fixturing on the angle plate probably will out-perform the
vise.

I just don't see where the trunnion has much to offer. The trunnions I'm
familiar with typically have four sets of dedicated fixtures, each holding
multiple parts, for higher-volume production work. That makes sense. A
single vise on a trunnion doesn't make much sense to me. It looks like a
gadget in search of a reason to live.

--
Ed Huntress