Ryobi DP121L drill press: speed not constant

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Forum topic by Brett posted 01-26-2011 12:58 AM 2009 views 0 times favorited 3 replies Add to Favorites Watch
View Brett's profile


660 posts in 2712 days

01-26-2011 12:58 AM

The Ryobi DP121L drill press features a lever to change RPMs. On my unit, after I adjust the speed (say from 1600 rpm to 1200 rpm), the lever slowly goes back to its original position and the RPM goes back to its original value. Is this the “correct” behavior for this drill, or should it maintain the speed I set it to? Thanks.

-- More tools, fewer machines.

3 replies so far

View William's profile


9949 posts in 2871 days

#1 posted 01-26-2011 05:04 AM

You said the lever itself moves back to the original position. This sounds to me like maybe vibration is causing it to move. If that’s the case, you have two options. Figure out a way to eliminate the vibration, or figure out a way to make the lever stay put with the vibration. Your deicision is going to have to based on exactly how much vibration there is. Depending on what you’re drilling through, a small amount of vibration just can’t be helped. I had a tensioning lever that kept moving on a stationary belt sander one time. I put a small rubber O-ring on it near where it attached to the tensioning block and never had any more problems out of it.
I’m sorry I’m not more familiar with that particular press. Photos may help come up with more or better suggestions.


View mvk5150's profile


3 posts in 2719 days

#2 posted 01-26-2011 06:03 AM

I have this drill press but don’t have your problem. It should stay at the speed you set. Is the nut on the speed lever loose?

View Brett's profile


660 posts in 2712 days

#3 posted 01-27-2011 06:04 PM

Well, it appears that the problem was a loose nut (not me, the one on the lever arm). Thanks for the tip!

-- More tools, fewer machines.

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