True rotary tying axis?

**Gemrod** · 01-01-2012, 10:33 AM

I have a question. It
is dumb.....and I should be able to figure this out in my head. But it seems in
my older years I no longer "understand" everything I "know".

ICW the
true axis on a rotary vise. I do know that the shank of the hook has to be in
the exact axis of the centerline of the rotation in order to truly rotate on an
even axis.

Does the tip of the jaw have to "always" be on the centerline
of this axis for level, even, true rotary?

Example you are tying a #10 nymph hook
and have adjusted your vise for true rotary because you gotta make a brazillion
turns. It runs on true rotary axis.

Now you put in a big Orvis Bass Hook
1/0 and you also have to make a brazillion turns. But the hook shank is on a
much bigger hook....and thus the shank is sitting up much higher in the vise.

Now...if one adjusts this level of the "jaws" tip downward to where the
jaw tip is no longer horizontal with the centerlin of the rotary...but is
parrallel to it....but the shank of the hook is now on the centerline axis...will that shank of the hook turn in true level rotary.......?
Or because....if it is on center of the axis, but the "jaw tip is not"....will it be off
a great deal?

I guess one cannot adjust the "centerline".....up and
down....just the jaw and thus the hook.

Would greatly appreciate your
comments on this question.

I know it is dumb. But i wanna know.....and
am not sure I know....ya know what I mean?

I am tinkering with a Danvise and you cannot adjust it's jaw tip up and down to find out. I have the extension in it...not the original mount.

**1fish2fish** · 01-04-2012, 01:24 AM

If you can not adjust vertical position of the jaws, try putting the hook in the vise further up the bend. This makes tying some things a little more difficult, but you can still get some of the benefits of a rotary vise. Also, it's not the end of the world if the hook isn't perfectly centered in the vise. It is still pretty easy to tie if the hook is only slightly off, but any big differences start to cause problems.

**KPitt** · 01-20-2012, 02:20 AM

With the Nor Vise it is the same, it is a matter of positioning the hook correctly if you are using the regular jaws. Sometimes it is a bit trial and error for specialty hooks.

**wwelz** · 01-20-2012, 10:46 AM

Renzetti is a true rotary . This video explains how to adjust the vise for different hooks to achieve a true rotary effect. http://www.renzetti.com/video/ataleofthreevices420.flv

**Silver Creek** · 01-20-2012, 02:46 PM

I have a Renzetti Master Vise with an Al Sable Speed Crank installed so I can really rotate that head super fast. The Master is one of the few rotary vises with an adjustable head position. I have never used that feature because I don't tie in a large enough range of hook sizes.

If you are a commercial tier that cranks out hundreds of flies in a large range of sizes, a vise that adjusts the center of rotation to the hook shank is an advantage because it reduces wobble when rotating the vise. For most tiers, we rotate the vise slowly enough that the wobble does not bother us.

For me it is a non issue. I use a Renzetti Traveller without that adjustment as my travel vise and it is fine.

**Magnet** · 01-20-2012, 09:24 PM

By the way Gemrod, welcome to the site. And that was a really good question. There are no dumb ones here.

**Magnet** · 01-20-2012, 09:21 PM

The concentricity of the hook shank to the spindle rotation is what you want but for practical application purposes exact true position is not necessary. As mentioned above, shank parallelism to the rotation center line is also a factor if you do not want wobble. So if in theory you wish to achieve true shank rotation your jaw tips will be off the centerline.