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Morse Taper connection on Drill Press

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Forum topic by richgreer posted 784 days ago 915 views 0 times favorited 10 replies Add to Favorites Watch
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richgreer

4522 posts in 1698 days


784 days ago

I was using a large (3”) Forstner bit on my drill press. The bit snagged and the chuck fell out. The Morse Taper did not hold. I jammed it back into place. However, the connection is not as secure as it was. The chuck has fallen out several times since then.

Is there a technique for getting this morse taper to seat securely?

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.


10 replies so far

View jmos's profile

jmos

681 posts in 993 days


#1 posted 784 days ago

I had a similar incident. I cleaned (degreased) both surfaces as well as I could and then seated the chuck with a sharp mallet blow. Hasn’t fallen out since. Did find some youtube videos on the subject, but no wonderful wisdom.

-- John

View CharlieM1958's profile

CharlieM1958

15683 posts in 2842 days


#2 posted 784 days ago

First, wipe the taper down with mineral spirits. It needs to be completely clean and grease free. Then when you install it, make sure the chuck is all the way open so the jaws are fully retracted, put a block of wood against the chuck, and tap the wood sharply with a rubber mallet a couple of times.

-- Charlie M. "Woodworking - patience = firewood"

View DrDirt's profile

DrDirt

2398 posts in 2366 days


#3 posted 784 days ago

I open the chuck fully so that the three “fingers” that stick down to grip the bit are fully retracted, than a good whack or two with a dead-blow mallet takes care of it.

Make sure the taper (male and female parts) are clean – no sawdust or else you will have excessive run-out.

-- "If we did all the things we are capable of doing, we would literally astonish ourselves." Edison

View Chris 's profile

Chris

1867 posts in 2615 days


#4 posted 784 days ago

A Trick a machinist friend taught me when I had this happen on my Old DP:
1. Clean as Charlie said
2. Open the Jaws fully
3. place in Freezer for a couple of Hours (Metal Contracts)
4. Re-insert as suggested by Charlie.

When the metal heats back to room temp the mating surfaces will fit far tighter. It worked for me….

-- "Everything that is great and inspiring is created by the individual who labors in freedom" -- Albert Einstein

View MonteCristo's profile

MonteCristo

2094 posts in 812 days


#5 posted 784 days ago

@Chris

Thanks for the tip ! I have had exactly the same issue when using big Forstner bits on my drill press as this thread describes. I tried cleaning it well and doing the reinstall as described above but it seemed the big Forstners (4” or so) still caused trouble. Your trick is worth a try.

When I think about this trick more, if the chuck shrinks a bit in the freezer, then gets reinstalled, isn’t it going to expand as it warms up and then not be as tight as otherwise ? Am I missing something here ??

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

View richgreer's profile

richgreer

4522 posts in 1698 days


#6 posted 784 days ago

Thanks to all for your great advise. This is great.

Of course, I knew this was the place to come for great advise.

Thanks again.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View MedicKen's profile

MedicKen

1599 posts in 2086 days


#7 posted 784 days ago

Clean as stated above, place chuck back completely open then instead of hitting it with a mallet or hammer use a block of wood and the press itself to press the taper back into place.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

View Andywoj's profile

Andywoj

5 posts in 785 days


#8 posted 783 days ago

Good tip on the freezer.
thanks.
Andy

View NormG's profile

NormG

4088 posts in 1628 days


#9 posted 783 days ago

Sounds like they all would be of benefit, I will keep the freezer tip in mind

-- Norman

View AHuxley's profile

AHuxley

208 posts in 1946 days


#10 posted 783 days ago

@MonteCristo the taper will expand every so slightly when it returns to room temp thus tightning the joint. Imagine a bisquit or dowel that after installation swells the joint is tighter. The only issue I see would be the taper could actually push itself outward as it heats up since it is well a taper.

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