On 5/21/24 07:05, Viesturs Lācis wrote:
Hello!
I need to add tool length sensor to a Biesse retrofit. So I wanted to
ask the audience to share their experience of where to get one.
I found this:
https://www.aliexpress.com/item/1005002538659888.html
Any thoughts on how good/bad it is?
Viesturs
Probably as good as any. But its overkill, designed to impress the
visiting frogs. When I need something like that, i usually saw off a
small pad of double sided copper pcb, solder a wire to the top side and
glue the bottom down someplace readily findable with the tool in the
spindle. I usually clip a ground onto the tool since some spindle
bearings are ceramic & not very good grounds. A G38-2 is used to find
when the tool contacts the pcb. Sometimes I run the tool backwards so it
doesn't cut the copper. If not spinning or is spinning backwards, leaves
no mark of the pcb, repeatable to a tenth or better. The major diff is
the hardened contact face, and the added error caused by the switch in
these gismo's. The repeat accuracy of the cobbled up pcb is probably
better than this device if not abused. They'll all need calibrated, but
that is a given. I'd opt to save that $35 + ship. A small sheet of pcb,
doesn't need to be double sided, can be a lifetime supply of TLO
setters. Accuracy is improved if an air blast cleans the tool first.
Old swarf stuck to the tool can give a premature reading a thou or so
early. Stiction in how he machine moves is a bigger problem. But that is
a machine with poor lube that will affect all such devices. I'd save
the $45 & use the pcb... If you wreck it with a spinning tool its pennys
to make a new one. The bigger problem is remembering which pin on the
breakout board is the probe connection. Find it once and bring it out to
a banana socket with a dymo or p-touch label. Problem solved.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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