orangeman Posted June 18, 2017 Report Share Posted June 18, 2017 I recently bought a little used RBI HAwk. I have contacted Bushton Manf to find out how old. No response yet. Obviously an older model as it came with a VCR tape! However the manual says NOT to plug it into a GFI circuit as it has a DC motor. Any comments on the latter as all I have in my basement shop are GFI circuits. I would have to run a long extension cord from somewhere else. bb Quote Link to comment Share on other sites More sharing options...
SCROLLSAW703 Posted June 18, 2017 Report Share Posted June 18, 2017 i plugged mine into gfi sockets, & it had a dc motor. never had any problems. mine was a vs220 i bought used. i had it three years, & used it hard & put alot of hours on it. it never backed away from anything i put to it. Quote Link to comment Share on other sites More sharing options...
Iguanadon Posted June 18, 2017 Report Share Posted June 18, 2017 Even the new BM owners manual says not to plug into GFI outlet. Rather odd. http://www.hawkwoodworkingtools.com/files/SawManuals/BM-SERIES_SAW_MANUAL_4.pdf Quote Link to comment Share on other sites More sharing options...
hawkeye10 Posted June 18, 2017 Report Share Posted June 18, 2017 I am not an electrician but I don't understand why you shouldn't do that. I to would like to know the answer. Quote Link to comment Share on other sites More sharing options...
tonylumps Posted June 18, 2017 Report Share Posted June 18, 2017 If you turn the speed control too fast, will it throw the breaker? Quote Link to comment Share on other sites More sharing options...
Dan Posted June 18, 2017 Report Share Posted June 18, 2017 From what I remember, GFCI monitors the current differential between the hot and neutral wires. If the difference is 0 amps all is good and the circuit is happy (doesn't trip). Characteristics of a DC motor when it is operating properly can cause a differential between the hot and neutral wires causing the GFCI to trip. The trip point of GFCI can vary slightly and the differential in DC motors can vary significantly. Ma y manufacturers of power tools put the statement about GFCI in their literature to reduce the number of calls about tripping GFCI (as long as the user reads the information). GFCI were designed to protect against electrical shock to people (like using a hair dryer in the bath tub). If your tools work on a GFCI keep using it. If not, you could install a separate outlet for those tools. hotshot, kmmcrafts, NC Scroller and 4 others 7 Quote Link to comment Share on other sites More sharing options...
orangeman Posted June 18, 2017 Author Report Share Posted June 18, 2017 Thanks Dan - good explanation. bb Quote Link to comment Share on other sites More sharing options...
amazingkevin Posted June 19, 2017 Report Share Posted June 19, 2017 21 hours ago, Dan said: From what I remember, GFCI monitors the current differential between the hot and neutral wires. If the difference is 0 amps all is good and the circuit is happy (doesn't trip). Characteristics of a DC motor when it is operating properly can cause a differential between the hot and neutral wires causing the GFCI to trip. The trip point of GFCI can vary slightly and the differential in DC motors can vary significantly. Ma y manufacturers of power tools put the statement about GFCI in their literature to reduce the number of calls about tripping GFCI (as long as the user reads the information). GFCI were designed to protect against electrical shock to people (like using a hair dryer in the bath tub). If your tools work on a GFCI keep using it. If not, you could install a separate outlet for those tools. Great explanation. Quote Link to comment Share on other sites More sharing options...
Rolf Posted June 19, 2017 Report Share Posted June 19, 2017 (edited) I think the issue is with the electronic control circuitry. I have Nova DVR XP wood lathe that I can not run on my dedicated GFCI circuit line in the shop. I think there are pulses in the controller (electronic noise) that feed back in to the outlet causing it to trip. Unfortunately my oscilloscope has decided not to work and I cant verify that. I will plug my Hawk into that circuit and see if I have a problem. Edited June 19, 2017 by Rolf Quote Link to comment Share on other sites More sharing options...
orangeman Posted June 22, 2017 Author Report Share Posted June 22, 2017 (edited) Got an answer from Bushton. My newly acquired used Hawk is a 1999 model. And they have a DVD vs a VCR tape but they also gave me a you tube link which has the same info. The saw evidently was not used very much as it looks brand new. Also got a ton of blades with the saw which I will never use as hey are mostly spiral blades. bb Edited June 22, 2017 by orangeman Quote Link to comment Share on other sites More sharing options...
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