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-   -   Bench grinders. (https://www.woodworkingtalk.com/f12/bench-grinders-213169/)

hawkeye10 06-20-2019 10:25 AM

Bench grinders.
What horsepower is a 5 amp motor?

Thank you.

Steve Neul 06-20-2019 11:08 AM

Should be about 3/4 hp.

faith michel 06-20-2019 11:26 AM


Originally Posted by hawkeye10 (Post 2059695)
What horsepower is a 5 amp motor?

Thank you.

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


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..https://uploads.tapatalk-cdn.com/201...3f9d4f64ea.jpg

Sent from my SM-J700F using Tapatalk

Steve Neul 06-20-2019 11:31 AM

You take the wattage and divide by 746. 170 watts would be about 1/4 hp.

epicfail48 06-20-2019 04:37 PM

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

woodnthings 06-20-2019 05:21 PM

Go by this description .....
This is a 1/2 HP motor which at full load rating is 5.4 AMPs :

Now it gets confusing:
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:

hawkeye10 06-20-2019 09:41 PM

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.

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