Re: [CAD_CAM_EDM_DRO] Bport Tachometer

jackw19x wrote:

>Has anyone installed a magnetic pickup for digital tachometer on a
>Bport Type I J-head?
>
>This type of sensor typically reads a gear or something ferrous w/
>teeth. It'd be nice to avoid having the pickup travel up and down in
>order to keep alignment with its gear. Maybe the drawbar, somewhere
>protected under the cover?
>
>
>

There is a large spur gear on the lower part of the direct drive clutch.
It is what the backgear pinion engages with when in the low speed
range. But, it turns with the spindle all the time. It has the spline
that drives the spindle in the center of it. It does not move up and
down. It is the last thing in the drive train that doesn't move with
the quill. You could easily drill a small hole in the main casting to
insert the sensor. It does have a lot of teeth, maybe 50 - 100, so you'd
have to make sure that would not cause a problem with too many
pulses / rev.

Jon