how to measure temperature of a rotating drill bit
how to measure temperature of a rotating drill bit
(OP)
I am trying to measure the temperature of a drill bit while drilling metals, I intend to pass the thermocouple through the one of its coolant holes , the problem is that the drill will be rotating and the thermocouple should send the temperature reading in a wireless way to the data logger ,is there such wireless method which I can use to capture the temperature while the drill is rotating. or is there any small wireless temperature sensors ?
I don't want to use a thermal/IR camera..
I don't want to use a thermal/IR camera..





RE: how to measure temperature of a rotating drill bit
Why don't you do what everyone else does and just flood the contact area with enough coolant to preclude the drill ever overheating?
Keith Cress
kcress - http://www.flaminsystems.com
RE: how to measure temperature of a rotating drill bit
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: how to measure temperature of a rotating drill bit
Keith Cress
kcress - http://www.flaminsystems.com
RE: how to measure temperature of a rotating drill bit
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: how to measure temperature of a rotating drill bit
RE: how to measure temperature of a rotating drill bit
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RE: how to measure temperature of a rotating drill bit
I do
n'twant to use a thermal/IR camera.RE: how to measure temperature of a rotating drill bit
Dan - Owner
http://www.Hi-TecDesigns.com
RE: how to measure temperature of a rotating drill bit
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RE: how to measure temperature of a rotating drill bit
RE: how to measure temperature of a rotating drill bit
RE: how to measure temperature of a rotating drill bit
RE: how to measure temperature of a rotating drill bit
Actually, another option is to build a slip ring around the drill head.
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RE: how to measure temperature of a rotating drill bit
This weeks award for obscure humorous physics reference goes to... itsmoked!
"Will work for (the memory of) salami"
RE: how to measure temperature of a rotating drill bit
Dan - Owner
http://www.Hi-TecDesigns.com
RE: how to measure temperature of a rotating drill bit
... yes, it would be a reading of the bulk test article temperature near the cutting zone, possibly not too different from a measure of the drill flute temperature somewhere near the cutting zone.
Mike Halloran
Pembroke Pines, FL, USA
RE: how to measure temperature of a rotating drill bit
This thread reminds me of The Old Barometer Joke.
RE: how to measure temperature of a rotating drill bit
There are some problems.
Few lathes spin fast enough to get a drill flute up to optimum speed.
So, don't use it as a drill. Put it on the cross-slide, at say 75 degrees behind the axis, and use the instrumented flute to shave the face off a plate. The surface speed goes up as the drill is fed from the center, prebored hole, to the periphery, in a way that's independent of the drill diameter, but it can go fast enough to give data that will represent real drilling conditions with a fast spindle.
That may not give a representative temperature, because it removes friction from the drill's chisel point from the situation, and also whatever heat is associated with dragging the flutes against the drilled surface. ... but maybe you wouldn't want those contributions included anyway.
Mike Halloran
Pembroke Pines, FL, USA
RE: how to measure temperature of a rotating drill bit
The problem with instrumenting the article is that the article, being metal, is essentially a giant heat sink. It's probably going to be nowhere near the temperature of the bit.
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RE: how to measure temperature of a rotating drill bit
now the problem is that I am worried that when I attach the wireless data logger to the rotating spindle it wont be able to send the measured readings or even wont be able to record anything and send to the receiver due to the high rotational speed or the high vibrations caused while drilling the material ?!!! what do you think guys ? how possible is this to happen?
Thank you all for your comments
RE: how to measure temperature of a rotating drill bit
So far I have detected no clue about which data logger you intend to use,
or which spindle you intend to use,
so I can't conjecture.
Mike Halloran
Pembroke Pines, FL, USA
RE: how to measure temperature of a rotating drill bit
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RE: how to measure temperature of a rotating drill bit
As a point of reference, the optimum rpm for drilling a 1/4" hole in aluminum is somewhere near 18,000 rpm.
... so I wouldn't just assume that any old data logger will survive.
Mike Halloran
Pembroke Pines, FL, USA
RE: how to measure temperature of a rotating drill bit
I hate to burst your bubble khalchris. Are you not realizing that NOTHING YOU DO will get you the correct temperature?
The temperature at the cutting faces is going to be different by hundreds of degrees from wherever you're sensing at. If you've somehow contrived to put the sensor right at the cutting edge in contact with the material you've completely invalidated its readings because it isn't cutting it's just rubbing.
As the tool cuts into the workpiece how the heat leaves the bit changes dramatically because the material starts changing its thermal coupling to the tool and the conduction cross section changes.
Keith Cress
kcress - http://www.flaminsystems.com
RE: how to measure temperature of a rotating drill bit
Have you? (found a way to do that measurement)
What speed are you running the drill bit at?
Typical drills will not accept the unbalance that a transmitter causes. Or, the transmitter will not accept the forces caused by rotation.
So, what dimensions are we talking about? What speeds? What temperature are you interested in? The tip's temperature or the stem's? Or just about any temperature that you happen to read? Is this a real problem? Or something you just thought would be interesting to discuss in general?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: how to measure temperature of a rotating drill bit
This is worth a try.
Why do you want to know the temperature??
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: how to measure temperature of a rotating drill bit
Maybe not totally relevant, but this thread made me think of the pressure transmitters in my car's wheels. They survive an awful lot of shock while running maybe 1000-ish RPM, and report pressures on the road. They're about $50 per wheel.
Of course, you're not measuring pressure -- but a similar temperature device seems possible to me. A spinning drill seems like a calm environment compared to slamming a pothole at 70 mph on the I-85.
Best to you,
Goober Dave
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RE: how to measure temperature of a rotating drill bit
Drill given 18,000 rpm (?), ~9200g per inch of radius.
I recommend safety goggles.
RE: how to measure temperature of a rotating drill bit
Best to you,
Goober Dave
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RE: how to measure temperature of a rotating drill bit
RE: how to measure temperature of a rotating drill bit
The WISP module can be read with an RFID reader. The distances involved will be a few centimeters at most.
http://en.wikipedia.org/wiki/Wireless_Identificati...
RE: how to measure temperature of a rotating drill bit
Understanding the answer to that one might provide a little more background as to how to solve the issue.