Panel ammeter for cutterhead current?
Moderators: piaptk, tragwag, Steve E., Aussie0zborn
Panel ammeter for cutterhead current?
I'm looking to add some nice panel ammeters to my lathe so I can monitor the head current. Does anyone have any tips/circuits they can share? I'm assuming you can't just put an AC ammeter in series without loss of sound quality.
Re: Panel ammeter for cutterhead current?
Anyone have any suggestions? I see Simpson has some low impedance meters, would that work? What are you all doing to monitor cutterhead current? I read an old post where someone tried to put a cheap ammeter in series and it affected sound quality.
Re: Panel ammeter for cutterhead current?
Hi,
It might be OK to add a meter in line with the head, but there are some considerations. You need to look to see what resistance the meter adds to the pathway. The meter is really an AC voltmeter with a shunt resistor. Also note that there is a rectifier (to convert the AC to DC) that is partly in signal path. Not sure if that would be audible, but it is something to consider. If you provide a model number or link, I can have a look and see if its appropriate for your application.
Mark
It might be OK to add a meter in line with the head, but there are some considerations. You need to look to see what resistance the meter adds to the pathway. The meter is really an AC voltmeter with a shunt resistor. Also note that there is a rectifier (to convert the AC to DC) that is partly in signal path. Not sure if that would be audible, but it is something to consider. If you provide a model number or link, I can have a look and see if its appropriate for your application.
Mark
Re: Panel ammeter for cutterhead current?
How about something like this? http://www.simpsonelectric.com/images/File/datasheets/rectangular_datasheet.pdf
Page 8, the first one under "AC Ammeters", part #02270
Page 8, the first one under "AC Ammeters", part #02270
Re: Panel ammeter for cutterhead current?
Hi,
That should work. Keep in mind its pretty slow responding (1.5 seconds), so you may not see short term peaks. If you want faster response, you would need to roll your own system with a shunt resistor, op-amp/ precision rectifier circuit and a voltmeter calibrated to read amps. Then you can tweak response times as needed.
Mark
That should work. Keep in mind its pretty slow responding (1.5 seconds), so you may not see short term peaks. If you want faster response, you would need to roll your own system with a shunt resistor, op-amp/ precision rectifier circuit and a voltmeter calibrated to read amps. Then you can tweak response times as needed.
Mark
Re: Panel ammeter for cutterhead current?
Bought these for the stylus heating, probably it work for cuttingheads too.
Didnt install it yet, just tried and measured, very accurate.
http://www.ebay.de/itm/Red-Blue-Dual-LED-Display-4-Bit-DC-0-33V-3A-Digital-Ammeter-Voltmeter-TE544/331915160102?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
Cheers
Didnt install it yet, just tried and measured, very accurate.
http://www.ebay.de/itm/Red-Blue-Dual-LED-Display-4-Bit-DC-0-33V-3A-Digital-Ammeter-Voltmeter-TE544/331915160102?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
Cheers