Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
I have yet to purchase a 4x6 bandsaw (harbor freight) and all this talk about overheating and burning up motors is making me question if I should buy one.
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Chris Hibbert <chris.hibbert@...>
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#14946
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Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
probably cost to as much as the saw is worth .? ya can get yerself a power strip & swap the breaker for a lower value ??? animal
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mike allen
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#14945
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Re: motor acted funny the other day
Motor overloads usually will not protect for a stall condition. I'm a retired electrical engineer and specialized in power system analysis and protection. Most of these small motor only have a thermal
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John Schirra
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#14944
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Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
John, Cooper bussman makes a fuse cover that fits on a regular handy box. Catalog is here: https://rexel-cdn.com/Products/Eaton-BussmannSeries/STY.pdf?i=1067FF2E-A6C9-4620-BCF8-93061ADEADE2 You can
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Aaron Brace
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#14943
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Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
The motor starters are external so will work with our motors if you get the exact right size and service factor rating.? However, I haven't seen any cheap ones but also haven't bought one for a long
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Jerry Durand
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#14942
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Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
Jim, is there any way that a 'NEMA motor starter with properly selected heater ' can be retrofitted to our 1/3 or 1/2 HP motors? I figured that motor protection would be built deep into the motor at
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John Vreede
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#14941
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Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
"This is getting overly complex? In most cases a NEMA motor starter with properly selected heaters should protect the motor against overloads and blade jams, no? " To a degree, yes. Protection is
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[email protected]
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#14940
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Re: Longer explanation of why the speed of the motor isn't 1800 or 1500 rpm.
From: <mailto:jim.klessig@...?subject=Re:%20Longer%20explanation%20of%20why %20the%20speed%20of%20the%20motor%20isn%E2%80%99t%201800%20or%201500%20rpm.> Jim.Klessig@... Date: Tue, 31 Dec
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KURT
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#14939
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Re: motor acted funny the other day
This is getting overly complex? In most cases a NEMA motor starter with properly selected heaters should protect the motor against overloads and blade jams, no? Or an IEC-type starter for that matter.
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Alan Muller
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#14938
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Re: motor acted funny the other day
Sorry guys been out of the loop a few days ((long hot summer days here in NZ, out on the 'bike, swimming etc while you're all shivering!) Thanks for the sensor link Jerry. I didn't think about North
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John Vreede
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#14937
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Longer explanation of why the speed of the motor isn¡¯t 1800 or 1500 rpm.
Walter Wrote ¡°Motor speed is dependant on the number of poles in the motor and the frequency of the AC voltage being supplied to it. North America 60 Hz, therefore a four pole motor will run at 1800
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[email protected]
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#14936
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Re: motor acted funny the other day
Capacitor start motors have two sets of windings, a sart winding and a run winding. The start winding is connected with a capacitor in it to give a phase shift which causes a shift in the magnetic
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Walter Townsend
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#14935
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Re: motor acted funny the other day
May I mention: Problems happening, is why I kinda keep an eye on what my saw is doing. Any other tool, or piece of equipment in my shop, or out of it, as well. I may wander a little, and work on my
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Bill Armstrong
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#14934
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Re: motor acted funny the other day
Just a side note, my idea to monitor the upper wheel will detect loose/broken blade, slipping drive belt, AND motor stall. A fuse monitors stall. -- Jerry Durand, Durand Interstellar, Inc.
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Jerry Durand
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#14933
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Re: motor acted funny the other day
I was told by another member that 1250 RPM was earlier given as the speed at which the motor would suddenly stall, not the RPM at which it was being routinely loaded down to. If that¡¯s the case, I
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Robert Downs
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#14932
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Re: motor acted funny the other day
Sound like a simple IEC (cheap) motor starter either manual or magnetic with a properly sized adjustable motor overload would be an easy solution. While speed sensing sounds like a fun project and I
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nitewatchman5
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#14931
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Re: motor acted funny the other day
Normally such motor protection is done by monitoring current, not speed. Current is relatively easy and cheap to monitor, speed not so much. The easiest and cheapest way would be to put in a fuse. If
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Jack Delaney
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#14930
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Re: motor acted funny the other day
I¡¯ll comment that if the motor is a 1750 RPM nominal and routinely loads down to 1250 RPM, either the motor id/was too small, the blade pressure is too high, or something else is wrong. Because my
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Robert Downs
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#14929
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Re: motor acted funny the other day
that could prob be done pretty with a Arduino & someone that knows how to program it ??? ??? animal
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mike allen
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#14928
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Re: motor acted funny the other day
If you're just trying to protect the motor, that works.? I'm looking at adding the relay power switch so it doesn't sometimes turn back on when you lift up the arm.? When you're 200 cuts into the
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Jerry Durand
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#14927
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