I had a Sommerville T-Slot model TT45 fence with a micrometer
adjustment. I did not use it a lot, but it sure came in handy when I
did. Before I retire my old saw, I want to be sure that the new Unisaw
starts off with the features of my old saw.
I do like the looks of it.. Nice job...
BUT I have never wished for a micro adjustment in the 15 years I have
used my Bies...just never NEEDED one... The original poster may have
and he solved his problem pretty nicely I think...
I don't have a Unisaw. I have a DW. But I am interested in
micro-adjustments for the fence. Unfortunately, I cannot figure out from
your photos how the micrometer moves the fence. I s'pose if I had a Unisaw
I might understand.
Now, maybe I do see if I am right about this: Does your gadget just push
the fence to the left and serves as a stop if you push the fence to the
right? -- Igor
Nice work. Way more precise than the tools I use would call for, or the
materials I use as well. I cut mostly wood on my table saw. But... that
doesn't stop me from appreciating a really nice job all the same.
When wanting extreme measures on my Unisaw with Bessy fence, I have
use a digital micrometer and Lee Valley rare earth magnetics to hold
the micrometer in place. Reads to 0.001 and is very repeatable, but
getting it to be EXACTLY a certain reading can take a good bit of
bumping and fine tuning the fence guided by the micrometer
I have also been know to take my Incra Jig off the router table and
clamp it's fench to the back of the Bessy fence AND then clamp the
plywood platform the Incra is attached to the the table extension -
gives me much easier positioning and when it is right I just lock the
Bessy fence down with it's clamp and off I go
On Wed, 08 Dec 2004 20:46:05 GMT, "Mike Marlow"
Its really not the work I do that fueled the interest in doing this. Really
three reasons. One, at times I want to trim off just 15 or 20 thousandths
(such as adjusting a sliding dovetail), two I had this adjustment built in
by the manufacturer of my old saw fence and felt that I did not want to
start off with less capability with my new one, and three, we are throwing
out a number of 30 year old fixtures in our optical lab at work and this
micrometer came gratis.
On 09 Dec 2004 06:33:56 GMT, email@example.com (JMartin957) calmly
The more precisely you cut the wood, the more professionally it fits
together (for fine woodworking) and the better it looks. It can also
mean the difference between a bad glue joint and a good one. If you
CAN cut more precisely, why not do it? It's also good for shaving off
those RCHs of wood which causes interference fits.
Consider the width of a dado slot. Adjusting the fence for that makes
it cut perfect openings. Ditto tenons, sliding dovetails, etc.
========================================================= CAUTION: Do not use remaining fingers as pushsticks!
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I still wonder just how useful one would be on a Uni-Fence? Every one I've
ever used had a very slight movement, toward the blade, when being locked.
Although small, it would sure seem to be enough to throw off any measuring
in the "thousandths" range.
Amen! And well said. As I've written here before, where I can achieve
precision I try to do so, subject to some cost-benefit. It's akin to
reducing the number of variables in any problem. If I were to figure out
the least precise operation in any part of a ww project and use that degree
of precision in all measurements and other related steps ... -- Igor
Sort of like the philosophy you use when you test or measure something.
You want the device you are using to do the measurement to be 10 X as
accurate as the thing you are testing is to be.
As far as the movement of the Unifence -- don't know yet. I hope that
I can push the fence against the micrometer while I am clamping the
fence and keep it from moving.
First of all, a micrometer is a tool for measuring, not for pushing large
assemblies such as a table saw fence. The threads simply aren't designed for
that. Since it was free, however, I can't complain too much.
Second, what do you think a change of .001" on the micrometer means to the cut?
Try putting a couple of DROs on the fence - one at the front and one at the
back - and see what the movement really is.
Lacking the DROs, a better tool for the job would be a much heavier screw - say
a 1/2" x 20 tpi. One turn would be 50 thousandths. A sixteenth of a turn
would be about .003" - which is about what a typical hair is. Need to be any
more accurate than that? I never measured a RCH.
I do appreciate the need for accuracy - it its place. I do a lot of
metalworking as well as woodworking. There are times when I have to hold
accuracy to "tenths" (.0001", tenths of thousandths) for such things as bearing
fits. But I don't work to that accuracy unless the part requires it. And,
frankly, I can't think of any woodworking operation that would require working
If I need a dado to a precise size I set the head to that size to begin with,
making a few test cuts until I get it right. I'm willing to bet I get a more
accurate cut that way than you do by moving the fence for a second pass. Same
goes for tenons. Sliding dovetails? Straight or tapered? I guess I've always
just found a plane to be the best tool for any final adjustments.
In short - since the micrometer head was free, it's fine. But I wouldn't
encourage others to run out and buy micrometer heads to make similar adjusters.
Because it's the wrong tool for the job. It doesn't give you an accurate
reading of fence position. And I can't conceive of any normal woodworking
operations where micrometer accuracy is necessary.
Oh, I wouldn't encourage anyone to do that either! And it would not
greatly surprise me if the threads gave out if I get aggressive with
it. But...any other thing I do will be more expensive--free, you know.
And, this way I will be taught first hand how many thousandths make a
difference in a fit.
That's a good idea, but how do you make it happen? Have you measured
the wobble in your blade while it cuts? I'm not being funny here. I
want to know. Accuracy of cut also depends on the material, not just
the cutter. I've always known that such accuracy [say ten thou] was
useful in mechanical assembly, but in woodworking? Wood is
compressible. There has to be variation in *any* saw cut. What I'd
like to know is the measured accuracy/precision of the cut after you
are finished using the micrometer. What difference is there from
tooth to tooth measured from a distance away? Are all teeth in a
blade lined up to the same accuracy? What if you measure to one tooth
and there is another that will cut a shade further out? Blade wobble
would be a primary consideration for me in judging if the accuracy set
up is retained. You could set up an electron microscope to line up
the blade, but not cut to that accuracy by a long shot, so what makes
the micrometer so useful then? What I'm driving at is whether or not
you've made a cut on one piece, then moved the micrometer a thou and
made a cut on another, then actually measured that thou difference in
the materials. But still and then, when you glue and clamp all that
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