designing a DAQ

Hi all,
Thanks for your replies.

> What do you mean by "rotational force"? =A0Are you discussing torque on a
> shaft? =A0What, specifically, are you trying to accomplish?

Yes, I am trying to measure torque on a shaft, and I also have find to
the amount of force or vibration on the body containing the shaft when
the shaft rotates.

On Wed, 9 Dec 2009 17:30:15 -0800 (PST)
kkrish <clearminded.kkrish@gmail.com> wrote:

> Hi all,
> Thanks for your replies.
>=20
> > What do you mean by "rotational force"? =A0Are you discussing torque
> > on a shaft? =A0What, specifically, are you trying to accomplish?
>=20
> Yes, I am trying to measure torque on a shaft, and I also have find to
> the amount of force or vibration on the body containing the shaft when
> the shaft rotates.
>=20

There are probably better sensor guys here than me, but just offhand,
the answer that comes to my mind is some kind of pickup monitoring the=20
gear teeth, either an optical or variable reluctance.  Those two
signals together can tell you the phase relationship between the two
gears, from which you should be able to infer the torsional flex on the
shaft, and from there the torque.

--=20
Rob Gaddi, Highland Technology
Email address is currently out of order

On Dec 10, 11:29=A0am, Rob Gaddi <rga...@technologyhighland.com> wrote:
> On Wed, 9 Dec 2009 17:30:15 -0800 (PST)
>
> kkrish <clearminded.kkr...@gmail.com> wrote:
> > Hi all,
> > Thanks for your replies.
>
> > > What do you mean by "rotational force"? =A0Are you discussing torque
> > > on a shaft? =A0What, specifically, are you trying to accomplish?
>
> > Yes, I am trying to measure torque on a shaft, and I also have find to
> > the amount of force or vibration on the body containing the shaft when
> > the shaft rotates.
>
> There are probably better sensor guys here than me, but just offhand,
> the answer that comes to my mind is some kind of pickup monitoring the
> gear teeth, either an optical or variable reluctance. =A0Those two
> signals together can tell you the phase relationship between the two
> gears, from which you should be able to infer the torsional flex on the
> shaft, and from there the torque.
>
> --
> Rob Gaddi, Highland Technology
> Email address is currently out of order

Couple of 3D accelerometers should do it.  One stationary for
vibrations and one for rotations.

On Thu, 10 Dec 2009 13:49:37 -0800 (PST)
linnix <me@linnix.info-for.us> wrote:

> On Dec 10, 11:29=A0am, Rob Gaddi <rga...@technologyhighland.com> wrote:
> > On Wed, 9 Dec 2009 17:30:15 -0800 (PST)
> >
> > kkrish <clearminded.kkr...@gmail.com> wrote:
> > > Hi all,
> > > Thanks for your replies.
> >
> > > > What do you mean by "rotational force"? =A0Are you discussing
> > > > torque on a shaft? =A0What, specifically, are you trying to
> > > > accomplish?
> >
> > > Yes, I am trying to measure torque on a shaft, and I also have
> > > find to the amount of force or vibration on the body containing
> > > the shaft when the shaft rotates.
> >
> > There are probably better sensor guys here than me, but just
> > offhand, the answer that comes to my mind is some kind of pickup
> > monitoring the gear teeth, either an optical or variable
> > reluctance. =A0Those two signals together can tell you the phase
> > relationship between the two gears, from which you should be able
> > to infer the torsional flex on the shaft, and from there the torque.
> >
> > --
> > Rob Gaddi, Highland Technology
> > Email address is currently out of order
>=20
> Couple of 3D accelerometers should do it.  One stationary for
> vibrations and one for rotations.

Though getting the data out of the rotating one is left as an exercise
for the particularly apt student.

--=20
Rob Gaddi, Highland Technology
Email address is currently out of order