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Re: motor amps ?
Posted: Thu Mar 10, 2022 8:59 am
by JPG
Hobbyman2 wrote: Wed Mar 09, 2022 11:25 pm
are you sure it is wired right for 110 ? If I recall there are wiring instruction inside some motors that will allow voltage conversions / speed changes , can you find a manual ? if so remove the electrical cover and check for alterations ?
a 3/4 hp motor should be more than enough to cut a pine 2x4 ? .
I would have to look but my 15 amp circular saw cant be too much more than that ?
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So for a 2 HP motor it will be 1500 watts or 1.5 KW. An easy way to convert HP (horse power) to Watts is by multiplying by using 745.7W/HP as a conversion factor; so a 2HP motor produces 1,491.4W of power (1.4914kW).
How many watts does a 2 HP motors have? - Quorahttps://
www.quora.com › How-many-watts-does-a-2-HP-...
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UNDERSTANDING WATTAGE & AMPERAGE
https://midwestconstructionrentals.com/ ... d-amperage
Read that link with a salt shaker.
Re: motor amps ?
Posted: Thu Mar 10, 2022 9:52 am
by DLB
lahola1 wrote: Wed Mar 09, 2022 8:45 pm
DLB, I only follow about 1/2 of what your saying but that's ok. This is what's so good about this forum. I've learned more about the intricacies of electricity following this forum for the last 5 years than my 1st 65 years.
Thanks for all the input.
The easier version is that it is not possible to produce 2 HP on the stated input power. But that IMO it should still produce respectable power capable of ripping a 2X on 115 V at 13 A. It's going to produce maximum power at 13 Amps, and we don't know if it is ever drawing 13 Amps. One possible explanation of not drawing 13 Amps is carbon buildup between brush and commutator, which is normal on a brushed motor and occasionally needs to be removed.
For comparison I have a 2 HP pump motor that runs on 115V or 230V. It is an induction motor, so this is probably true 2 HP (max). Per the tag, it requires 21.0 Amps on 115V.
- David
Re: motor amps ?
Posted: Fri Mar 11, 2022 9:42 am
by DLB
Here is a pic clipped from the manual Ed posted with the commutator part of the armature and one of the brushes highlighted. The manual says the brushes should be inspected regularly and replaced if worn to approximately 1/4 inch in length. I don't see the other brush in the diagram but it will be directly opposite the one shown. I withdraw my previous recommendation of a spray on the commutator unless the bearings are sealed type and you can keep the spray away from any gear grease. It would be better to remove the armature and clean the commutator. If you have to use an abrasive it should be a mild one.
- RAS Parts Diagram
- RAS Motor.jpg (60.68 KiB) Viewed 1003 times
- David
Re: motor amps ?
Posted: Fri Mar 11, 2022 11:53 am
by lahola1
DLB, thanks for that info. I'll inspect the brushes when I get a chance. I'm wondering, if I need to replace the brushes where would I get them?
Re: motor amps ?
Posted: Fri Mar 11, 2022 11:59 am
by BuckeyeDennis
lahola1 wrote: Fri Mar 11, 2022 11:53 am
DLB, thanks for that info. I'll inspect the brushes when I get a chance. I'm wondering, if I need to replace the brushes where would I get them?
CarbonBrush.com has a huge selection of commutator brushes. Even if you can't find your exact make/model, you may be able to match your existing brushes by style and dimensions.
http://www.carbonbrush.com/brushes.htm
Re: motor amps ?
Posted: Fri Mar 11, 2022 12:05 pm
by edma194
First, I think it's very likely the saw uses a standard armature and compatible brushes are available. Since your saw runs it's probably just the carbon brush material itself that is worn down and that can be replaced with a standard or modified part. A motor shop may be help you find the parts or customize something for you.
ETA: Great link from BuckeyeDennis!
Re: motor amps ?
Posted: Fri Mar 11, 2022 12:25 pm
by edma194
Interesting history on this tool The
Vintage Machinery page on Montgomery Ward - Powr-Kraft shows that the TPC models were made by
Portable Electric Tools, Inc.. Then
Benchmark Tool Co. succeeded Portable Electric Tools and they made the Shopcraft tools for J.C. Pennys. Somehow this company ended up being owned by the
McGraw-Edison Co. which in 1982 or so sold their power tool division to some company called Shopsmith, Inc.
Re: motor amps ?
Posted: Fri Mar 11, 2022 12:39 pm
by lahola1
Buckeyedennis,edma194; thanks for the brushinfo.
Re: motor amps ?
Posted: Fri Mar 11, 2022 12:41 pm
by lahola1
How cool is that?
Re: motor amps ?
Posted: Fri Mar 11, 2022 4:25 pm
by JPG
So call SS CS and ask for replacement brushes!