New guy, old machine

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JPG
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Re: New guy, old machine

Post by JPG »

"IR"???
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╟JPG ╢
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10
E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
AmishMachinist
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Re: New guy, old machine

Post by AmishMachinist »

JPG wrote: Thu Sep 16, 2021 12:52 pm"IR"???
IR, Internal Resistance adjustments can be made on the KB electronics boards to compensate for the resistance in the brushes and commutator of any given DC motor, also as a motor wears the brushes and commutator resistance changes too. As uniform as motors are manufactured, there is some variance from part to part, an IR adjustment can compensate for these ensuring a more ideal voltage is given to the motor. It’s actually quite surprising the difference it can make in a DC motor.
edma194
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Re: New guy, old machine

Post by edma194 »

Is the IR related to the HP resistors required on the KB controllers? Can you tell me anything about how those resistors function?

As for PWM, since I've been pondering using DC motors in a conventional Model 500 headstock I think it needs to maintain torque throughout the speed range since it is a multi-purpose tool. Each of it's basic functions and use to power SPTs has different requirements. For dedicated function machines, and/or if you can change belts like a Model 10 then simple controllers for DC motors should work quite well as long as the RPM:Power ratio works for you. I'm considering powering tools with a cheap treadmill motor, I think it's a good choice for a bench grinder which needs nowhere the speed power and speed range available.
Ed from Rhode Island

510 PowerPro Double Tilt:Greenie PowerPro Drill Press:500 Sanding Shorty w/Belt&Strip Sanders
Super Sawsmith 2000:Scroll Saw w/Stand:Joint-Matic:Power Station:Power Stand:Bandsaw:Joiner:Jigsaw
1961 Goldie:1960 Sawsmith RAS:10ER
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JPG
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Location: Lexington, Ky (TAMECAT territory)

Re: New guy, old machine

Post by JPG »

FWIW,one of the slow speed SPTs is the band saw which does not require great hp. Neither do the jig/scroll saw. Belt sander may require A bit more. Disc sanding also does not require great hp. The jointer and planer need high rpms. The planer needs great hp in addition.

So As I see it lower power at slow rpm is not a show stopper for SPTs, Turning large stuff is another matter.
╔═══╗
╟JPG ╢
╚═══╝

Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10
E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
AmishMachinist
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Joined: Tue Sep 14, 2021 8:22 pm

Re: New guy, old machine

Post by AmishMachinist »

edma194 wrote: Thu Sep 16, 2021 3:09 pm Is the IR related to the HP resistors required on the KB controllers? Can you tell me anything about how those resistors function?

As for PWM, since I've been pondering using DC motors in a conventional Model 500 headstock I think it needs to maintain torque throughout the speed range since it is a multi-purpose tool. Each of it's basic functions and use to power SPTs has different requirements. For dedicated function machines, and/or if you can change belts like a Model 10 then simple controllers for DC motors should work quite well as long as the RPM:Power ratio works for you. I'm considering powering tools with a cheap treadmill motor, I think it's a good choice for a bench grinder which needs nowhere the speed power and speed range available.
The IR and horsepower resistors aren’t directly related, but I do think they added to IR function because the board can be used with multiple different size motors. I’m not at all sure of why specifically they use different resistors
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