Non-contact speed sensors for watery environment
Non-contact speed sensors for watery environment
(OP)
I want to measure the speeds of a rotating electromagnetic chuck and a rotating vertical grinder. Problem is that there is a continuous & copious flow of cooling media that covers the chuck and the grinding head with a resultant splash due to centrifugal forces.
The probe cannot be located very near the chuck or the grinding head. It should be at least 2 feet away due to physical constraints.
Any idea of non-contact speed sensors for this application ?
PS - If this is not the right forum for this post, please point me to the right one. Thanks.
The probe cannot be located very near the chuck or the grinding head. It should be at least 2 feet away due to physical constraints.
Any idea of non-contact speed sensors for this application ?
PS - If this is not the right forum for this post, please point me to the right one. Thanks.
Muthu
www.edison.co.in





RE: Non-contact speed sensors for watery environment
Why aren't you just looking at the motor shaft?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Non-contact speed sensors for watery environment
Yes, it's Blanchard. The problem is that the client has Blanchard of all possible combinations - direct driven, gearbox driven with different gear ratios and topped by the fact all of them driven by VFD's.
The real people working with these machines absolutely have no clue on what the spindle speed is and are misguided by the VFD readings. So, there are productivity issues since the spindles are rotating at various speeds in different machines for the same job.
So, I would like to measure the speeds of the spindle as well as the chuck (which turns in opposite direction) to settle the productivity issues.
Muthu
www.edison.co.in
RE: Non-contact speed sensors for watery environment
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If we learn from our mistakes I'm getting a great education!
RE: Non-contact speed sensors for watery environment
Are there any laser speed sensors out there ?
Muthu
www.edison.co.in
RE: Non-contact speed sensors for watery environment
That is a hard one... Everything is so messy there. Fluids spattering everywhere.
I really think you need to try to do what Scotty suggested. Find a good repeater for your VFDs that let you set a scaling factor. Then use whatever it takes to measure the chuck and spindle and then just calibrate the repeaters. Label them with clear labels CHUCK & SPINDLE. That would solve your problem as far as workers knowing the actual speeds. This would also remove the cost and maintenance hassle any active measuring system would bring.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Non-contact speed sensors for watery environment
Keith - My client also has a failed chuck of 42 inches dia. If you happen to have photos of this chuck in dismantled state, could you possibly upload them on the Internet and post a URL to them? Thanks.
Muthu
www.edison.co.in
RE: Non-contact speed sensors for watery environment
Depends on how much you are willing to spend. Most drives will give a 4-20mA output, and there are plenty scaleable indicators. I like the ones from BEKA Associates in the UK for use in harsh environments - robust and well-protected, but they are also quite pricey.
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If we learn from our mistakes I'm getting a great education!
RE: Non-contact speed sensors for watery environment
Keith Cress
kcress - http://www.flaminsystems.com
RE: Non-contact speed sensors for watery environment
RE: Non-contact speed sensors for watery environment
Compositepro - Thx. That's what they are doing now. I wanted continuous speed display.
Muthu
www.edison.co.in
RE: Non-contact speed sensors for watery environment
Have you checked with Blanchard? I'm told they are very helpful and friendly. Could the manual be on-line?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Non-contact speed sensors for watery environment
Balluff BML Series pdf file
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RE: Non-contact speed sensors for watery environment
I will remember this mag tape for any future applications.
Muthu
www.edison.co.in