Flex Shaft Grinder

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Forum topic by LDO2802 posted 04-04-2017 03:15 PM 880 views 0 times favorited 6 replies Add to Favorites Watch
View LDO2802's profile


167 posts in 1036 days

04-04-2017 03:15 PM

I just got a flex shaft grinder that was hanging in my friends shop for about five years. He only used it once or twice, realizing that he doesn’t like to carve. There are no labels on it for me to know what kind it is. My question comes from the operation. When I press on the footpedal, it starts to rotate just fine, but after a few seconds the sound becomes rough and I get a lot of vibration in the handle. It doesn’t always happen, but it does enough that I took it apart to find out what was wrong. I cant see anything that would lead me to believe it is broken, but I replaced the bearings, tightened it down, and looked over the flex shaft. I don’t see anything amiss. A couple things:

When the sounds and vibration start, if I grab the flex shaft and physically pull it away and push it together the sound and vibrations stop for a second.

On the handle I noticed that even though everything is tight, there is still play in the chuck piece. I can push it in to the sheath about 1/8th of an inch back and forth.

It never makes the sound if I pull the hand piece off and just run the shaft by itself. Which leads me to believe it is a hand problem.

Any help is appreciated!

6 replies so far

View Jim Finn's profile

Jim Finn

2780 posts in 3527 days

#1 posted 04-04-2017 08:14 PM

On mine there is a little set screw that connects the interior flexible shaft to the motor. Maybe yours is loose. Mine is a “Mastercarver” brand.

-- No PHD just a DD214 Lubbock Texas

View Kelly's profile


2627 posts in 3550 days

#2 posted 04-05-2017 01:55 AM

These also need to be greased occasionally.

Mine is a Foredom 1/4 horse and about six years old and still runs smooth, but only has about twenty hours on it.

View LDO2802's profile


167 posts in 1036 days

#3 posted 04-05-2017 02:19 PM

I took the handle off, cleaned the interior, removed the cable covering and regreased it, and it works a little better, but still makes that noise occasionally. The noise sounds like the shaft is free spinning in the spindle, but the bit never stops moving.

I am probably going to buy a new one soon, since this one was free from a friend and I don’t even know who makes this one. It has no label anywhere on it.

View mpounders's profile


946 posts in 3501 days

#4 posted 04-05-2017 03:33 PM

Maybe it is the handpiece making the noise? Also make sure it is stored so that no kinks develop in the shaft. I hang mine. Is it possible the little key on the end of the shaft is worn or not making good contact with the hand piece?

-- Mike P., Arkansas,

View Kelly's profile


2627 posts in 3550 days

#5 posted 04-05-2017 03:37 PM

View LDO2802's profile


167 posts in 1036 days

#6 posted 04-05-2017 04:46 PM

I removed the handpiece and can replicate the problem without it. I THINK the problem is from where the shaft exits the sheath. I think the shaft is hitting something where the sheath tapers to the exit. I used a q-tip and got up in there to clean it and a lot of black grease came out, after that it ran better, but I think there might be something loose in there.

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