RPM reading over a press drill mod

[Docop]

Hi

I have a projet to convert a press drill but having the the part moved as a cnc. So it's mainly a fix speed tabletop drill and i need to have the RPM readout of the main shaft. So by not having a controller on it (turn on and it power up directly)
How can i mesure the speed change when drilling to monitor .. like the torque and have a constant readout?

Thank in advance

[drgee133]

Hi..
As I am a retired insturment tech and I can help you. You need a shaft encoder...which can be a wrap or a disc. Possibly you could drill a center hole in the end of the shaft driving the chuck or mount a wrap around a part of the rotating shaft and feed to an electronic measuring device.
Tachometers - AP1000 - Electro-Sensors, Inc.
I have no idea of price but I know it will work for you. As the drill becomes loaded and if speed drops...it will be noted on a digital readout and be very accurate! Electro sensors have every size and every application.
Good Luck
Drgee133@aol.com

[WayneHill]

http://www.sherline.com/rpmgage.pdf

[Docop]

Hi
So thanks for the info, of course the option of the shaft tachometer pointing the top of a circular disc around the chuck could be a good idea.
Also, is an opto could be better vs an sensing one ...

And finally, about the output of the device, basically, it will generate a tach signal and i will be able to hook up any small lcd display that just need a tach input or even: wrap the cable around the tach output cable of the sensor.

Thanks again