Bench grinders. - Woodworking Talk - Woodworkers Forum
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post #1 of 7 Old 06-20-2019, 09:25 AM Thread Starter
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Bench grinders.

What horsepower is a 5 amp motor?

Thank you.

Don in Murfreesboro, TN.
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post #2 of 7 Old 06-20-2019, 10:08 AM
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Should be about 3/4 hp.
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post #3 of 7 Old 06-20-2019, 10:26 AM
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Quote:
Originally Posted by hawkeye10 View Post
What horsepower is a 5 amp motor?



Thank you.
This is my grinder... it works very good.. i am so happy with it..

TECNICAL CAPACITY

Voltage: 230W Input Power: 170W Frequency: 50 Hz Size of the Stone: 150x16x12,7 No Load Speed: 2840 min Weight: 5.2 kg

How many HP ??? I dont know.. i didnt find it at the user guide..

Sent from my SM-J700F using Tapatalk
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post #4 of 7 Old 06-20-2019, 10:31 AM
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You take the wattage and divide by 746. 170 watts would be about 1/4 hp.
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post #5 of 7 Old 06-20-2019, 03:37 PM
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My rule of thumb is 1hp=10amps at 110v, 5 amps at 220. Strictly speaking Steve is correct on the wattage conversion, but wattage on the plate measures the power going in. Motors have an inherent amount of inefficiency, so if you put 100 watts into one you won't get 100 watts worth of power out of it

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post #6 of 7 Old 06-20-2019, 04:21 PM
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Go by this description .....

This is a 1/2 HP motor which at full load rating is 5.4 AMPs :
https://www.globalindustrial.com/p/m...BoC4XwQAvD_BwE


Now it gets confusing:
https://www.zoro.com/dayton-gp-mtr-s...OT_TYPE=SIMPLE
Full load rating is 9.6 AMPs.


So, is "full load rating" an accurate measure of the HP? Probably not. Continuous current rating is not given so you would need to measure it with an amp meter..... or a kill-a-watt device:
https://www.amazon.com/P3-P4400-Elec...72288073&psc=1

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 06-20-2019 at 04:31 PM.
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post #7 of 7 Old 06-20-2019, 08:41 PM Thread Starter
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The reason I wanted to know is I have a Craftsman variable speed grinder. I want to put some CBN wheels on it and they are heavier than normal wheels. As I understand it you need at least 3/4 HP because on startup anything less will be slow going at first.

Don in Murfreesboro, TN.
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