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Help, my drill press is slipping with forstner bits!

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Forum topic by JarodMorris posted 531 days ago 1147 views 0 times favorited 6 replies Add to Favorites Watch
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JarodMorris

165 posts in 973 days


531 days ago

Topic tags/keywords: drill press help forstner bit forstner bits

Youtube clip of what exactly is happening

If anyone knows how I should go about fixing this problem, I am all ears. It makes it virtually impossible to use my forstner bits. The drill press belt is configured in the video to run on 620 RPM. It has been my understanding that the larger the bit (drill or router) the slower the RPM should be.

All help is greatly appreciated.

Jarod

-- Dad: Someone was supposed to pick up his toys! Son: My name isn't "Someone".


6 replies so far

View PurpLev's profile

PurpLev

8476 posts in 2246 days


#1 posted 531 days ago

does the motor keep on turning or does it come to a halt?

since I can’t see in the video the motor/belt area there are 2 things the might be happening:
1. motor comes to a halt – your DP doesn’t have enough torque to turn this size drill (if you haven’t maxed out the belt settings and you can configure it to run slower- try that)

2. motor keeps on turning, belts doesn’t transfer torque to spindle: either your spindles are oily, or your belt is worn, try cleaning/drying the belt and pulleys and/or replace the belt with a better quality belt that wont slip.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Brandon's profile

Brandon

4136 posts in 1549 days


#2 posted 531 days ago

Perhaps you can try a link belt instead of the one that came with the DP. It sounds like teh motor is still turnning but the belt is slipping.

-- "hold fast to that which is good"

View Lee Barker's profile

Lee Barker

2163 posts in 1448 days


#3 posted 531 days ago

Jarod, the chuck clearly stops. So the bit is not slipping in the chuck, the power is not getting transmitted to the chuck.

That could be loose belt or it could be the Morse taper spinning in the quill.

Open the lid, exposing the belts, and do the same exercise. When the bit stops, if the motor keeps running the the belts are turning, it’s the latter problem. If the motor keeps running and there is no activity with the belts, it’s a belt tension issue.

I’m guessing it’s the latter.

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View Loren's profile

Loren

7230 posts in 2246 days


#4 posted 531 days ago

I think there is something you can do to “dress” the belts
and make them grip the sheaves better.

Usually there is a way to adjust the belt tension, sometimes
just a fixture on the motor mount.

-- http://lawoodworking.com

View PurpLev's profile

PurpLev

8476 posts in 2246 days


#5 posted 531 days ago

Loren – you can see that the chuck stops, so the chuck is properly tightened against the bit.

another thought – have you tightened the belt enough?

with some drill presses when you change pulley configuration you would need to apply more/less tension on the belt – try that first.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View JarodMorris's profile

JarodMorris

165 posts in 973 days


#6 posted 531 days ago

Thanks to everyone that replied! This is why I enjoy this forum. Very helpful people.

I forgot to mention that the chuck had fallen off but I had put it back on and “nudged” it a few times with my dead blow hammer to get it back on. I’m not sure why I hadn’t thought of looking to see if the belt was slipping. I guess my mind was slipping too. It turned out to the belt slipping on the pully over the motor. It was the smaller diameter so that makes sense. I loosened the screw on the side which locks the motor in place, used a wrench as a lever to tension the belt and tightened it up again and it’s just like it is supposed to be. Thanks so much.

I know when I’m not thinking straight, people on here will be.

Jarod

-- Dad: Someone was supposed to pick up his toys! Son: My name isn't "Someone".

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