MadModder
The Shop => Electronics & IC Programing => Topic started by: loply on October 02, 2012, 05:48:34 PM
-
Hi folks,
Does anybody know where I can pick up a simple, pre-made LCD photo-interrupter tachometer?
I've seen them once or twice over the years but can't find them available now.
I want to hook one up to my lathe as it's hard to know the spindle speed now that I have a VFD. I have a laser tacho but want to wire up a permanent solution.
Cheers,
Rich
-
I don't know if these are any good, but I have considered getting one for my 16" SB that I put a VFD on. The SFM option looks interesting.
http://mkctools.com/tachoptions.htm
BTW - I don't know this guy, just stumbled across his products on the web.
Mike
-
http://www.harborfreight.com/catalogsearch/result?q=tach
Take your pick.
-
When I added a VFD to my lathe, I got the Tachulator. Works perfectly. I wrapped the sensing pattern around the spindle inside the gearbox. Especially like the SFM function. The circuit board seems well designed and made. No problems at all.
Best
Stan
-
They are all over ebay for under $20 shipped.
Ive had one for a year, just started using it. it's a lifesaver
-
AR1911, which kind did you get? I've tried searching but I can only find laser tachos and automotive tachos, neither of which is ideal.
-
Loply, I did not understand you wanted a non-laser variety.
The only one like that I have was originally sold as a fan-clutch tester, and it's pretty crude.
-
Check out SenDEC tachometers, they have 2 flavors to choose from, RPM only (6,000 iirc) or, RPM while the machine is running & accumulated hours (9,999.9) when the machine is off.
As an example, here is one distributor,
https://www.gdimeters.com/products/5/Products+by+Type/rotating-shaft-tachometer-hour-meter
HTH,
Chazz
-
Another vote for the "Tachulator". Works flawlessly and very accurate in my experience.
http://madmodder.net/index.php/topic,6766.0.html (http://madmodder.net/index.php/topic,6766.0.html)
-
I have a Tachulator that i have yet to install. Bought it directly from the source, a nice guy in Hurst TX, a few miles from me.
But I confess I like the looks of that SenDec better. I may have to buy one and take a look.
-
Some VFDs can measure pulses on a spare input and display the result in RPM.
I have a variable reluctance sensor on the spindle of my mill with a simple op-amp to generate square pulses. The pulses feed one of the ABB VFDs inputs. It requires a half dozen settings to get it to display spindle RPM
Bill