HF Bench Grinder

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Forum topic by MrRon posted 12-26-2014 12:39 AM 756 views 0 times favorited 3 replies Add to Favorites Watch
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3898 posts in 2666 days

12-26-2014 12:39 AM

I got a HF 8” bench grinder. When I flip the switch, it takes about 7 seconds to come up to speed and it vibrates some. My old 6” bench grinder comes up to speed in about 2 seconds with little vibration. What could be the problem? I bought it because it had good reviews and I had a 25% off coupon.

3 replies so far

View FirehouseWoodworking's profile


684 posts in 2695 days

#1 posted 12-26-2014 06:44 AM

Mr Ron,

I can’t be of much help on the start up time, but as far as the vibration, my first test would be to swap out the grinding stone(s) to see if an out-of-round or out-of-balance wheel is causing the vibration. If possible, use one of the wheels from your other grinder.

If you know that they do not cause vibration on your other grinder, but there is vibration on the HF grinder, then the HF grinder is out of balance. It could be the motor, the bearings, or perhaps a bent shaft. In the event that it is one of those, I’d take it back and swap it out for a new one.

The HF grinders are not bad. However, I have heard all kinds of comments on the wheels provided with them. I’ve heard that some are poorly made and have exploded during grinding.

Good luck.


-- Dave; Lansing, Kansas

View dhazelton's profile


2289 posts in 1719 days

#2 posted 12-26-2014 02:17 PM

The problem is that it’s from Harbor Freight. I think their quality control is ‘if it doesn’t get returned then it was good enough.’ It takes forever to come up to speed because the motor is undersized for the load. I’d return it and get a Craftsman at the very least.

View REO's profile


883 posts in 1496 days

#3 posted 12-26-2014 06:47 PM

Up to speed isnt really important maintaining speed under the load you wish to apply is. you can substitute a larger capacitor to a point if it bothers you. check the stones both for run out on the circumference as well as side to side. the retaining washers could be bent or sometimes the label interferes with a good set. try dressing them.

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