View Full Version : Tachometer
I've been looking at various tachometers for my 3-in-1 lathe/mill thinking I'd build one into it permanently at some point. This is the latest look. I don't recall how I stumbled onto this site but the meter I bought was damn cheap, shipping was perfectly reasonable, delivery was a matter of days, and incredibly, it works exactly as expected. Like an IR thermometer it's a point and shoot device and the range is quite far. I put a 1/2" segment of reflective tape on my lathe's backplate and another on the quill of my mill. Using another tach for a reference I checked them both out and was pleased to see dead nuts agreement over the range of 100 to 2500 rpm on the mill. I didn't change lathe speeds as it's more work. The lathe was showing 595 for a 600 rpm belt config. Close enough.
$24.99 plus shipping and fast service.
06-30-2007, 01:10 AM
Before I shut down my computer store to retire a friend (and customer) in the PI business brought in his new $10K color hand held FLIR unit. Very cool. You could scope out a computer motherboard and tell the temperature of the individual parts to within 5 degrees by the false color in the image. At any time you can freeze frame it and/or save an image to the card. It would be great for checking hot bearings and other sources of heat. Kinda expensive.
There are a lot of websites that describe photography using digital IR. If you don't need exact figures for temperature, or are willing to do your own calibrations, it can be done for far less than 10 large.
It's worth googling digital IR just for the interesting pages that turn up. Where I work we see a lot of IR and UV interest and emphasis. The resulting imagery is quite dramatic. I've always enjoyed the work of the masters in B&W photography anyway, so this digital IR technology was immediately of interest for me.
Edit: This in particular is quite interesting - a homemade conversion of a standard digital camera to IR.
06-30-2007, 04:15 AM
I've got a IR thermometer with laser targeting, works plenty well enough for bearings, or finding a hot/lean cylinder...
My Rockwell is missing parts for the broken pseudo-tach (really just a calculated angle meter for the Reaves drive). So got a Niko, but it needs something to count. So I got a Shimpo that is oh so nice. Took a while to find a good deal on ebay, but I got my Shimpo for something like $35 and it removes the need to even know rpm and then do calcs, I just check surface speed directly... <big ol' grin>
I have a tach that reads surface speed directly too. It also doesn't need batteries. :D
06-30-2007, 12:06 PM
I have one of the old starrett counters. The one you posted looks great for the price somthing to put on my wish list.
I like the portability and non contact,that would be great for my model steam engines.
06-30-2007, 12:32 PM
I use a SW tach for head speed. When I really want to know what is going on with the metal, I use the FLIR EX320 or the Mikron TH5104. Heat soak conditions of the metal while machining can cause errors when it cools.
06-30-2007, 01:44 PM
The first infrared image is of a cylinder being bored.
This next infrared image is is checking the the balance of heat in the exhaust pipes.
06-30-2007, 09:15 PM
oldtiffe, where did you purchase your tacho? How much?
07-02-2007, 04:57 PM
On Saturday (6/30/07) read DP's thread about the tachometer, ordered it at 2:30 pm (east coast time), and it was delivered in the mail on Monday (7/2/07). That absolutely amaze me, from St. Paul, to the east coast in 48 hours, and 24 of those were a Sunday, and by the US Mail. I can't mail myself a letter from the post office on Saturday afternoon, and get it on Monday, Tuesday maybe. That's what I call fast service. The tachometer, an extra batch of reflective tape and shipping, for $35.00, and it work just like they said it would.
07-03-2007, 10:06 PM