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PM-833T EDUCATED QUILL STOP

RIMSPOKE

Active Member
Active Member
#1
THE PM-833T COMES WITH A FACTORY QUILL STOP .
UNFORTUNATELY , IT IS NOT VERY USEFUL .
IT CAN BE SET TO THE DESIRED HEIGHT BUT MOVES AS SOON AS YOU TAP IT .
IT ALSO CANNOT BE MOVED IN PRECISE INCREMENTS

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WITH THE DESIRE TO HAVE A SOLID & ADJUSTABLE TO .001" STOP , I BOUGHT
AN "EDUCATED NUT" ( IT's GRADUATED ) THAT IS INTENDED FOR A BRIDGEPORT .
THESE THINGS ARE GREAT BECAUSE OF THE INSTANT UP/DOWN FEATURE

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ADAPTING THIS TO THE PM MILL REQUIRES SOME NEW PARTS .
THE ORIGINAL CAST IRON BRACKET WAS REPLACED WITH PARTS CUT FROM STEEL .

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I WANTED A LOWER SECTION THAT IS EASILY REMOVABLE SO IT IS MADE TO CLAMP
ON THE QUILL IN TWO PARTS LIKE A CONNECTING ROD WITH MASSIVE 1/2-20 BOLTS .

IT WAS BORED OUT TO 2" AND THEN CHUCKED ON THE LATHE
MY HORVATH ECCENTRIC CHUCK ALLOWED ME TO CHUCK ON A DIAMETER THAT
ACTUALLY EXCEEDS THE SWING OF MY LATHE BY OFFSETTING THE CENTER !

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THE UPPER SECTION ALSO NEEDS TO BE SOLIDLY MOUNTED . I ONLY HAD 3/16'
CLEARANCE BETWEEN THE MOVING PLATE & THE FIXED ONE OR I WOULD LOSE
SOME QUILL TRAVEL . IT WILL BOLT TO THE UNDERSIDE OF THE HEAD THROUGH
THE ORIGINAL QUILL STOP HOLE AND THE EXTRA ONE THEY PROVIDED FOR NO REASON .

I LIKE THE USE OF CURVES SO THE FIXED SECTION WAS TURNED DOWN ON MY DRIVE PLATE .
IT ALSO IS SECURED BY TWO M5 CAP SCREWS THROUGH THE FACEPLATE HOLES .
IT IS AS SOLID AS A ROCK .

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I PUT A MEGA-CHAMFER ON THE UNDERSIDE OF THE MOVING PLATE TO REDUCE MASS
AND REDUCE THE VISUAL OBSTRUCTION .

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I FOUND A PRETTY CLOSE MATCH THE THE PAINT COLOR P-M USES SO IT WILL LOOK
LIKE IT BELONGS .

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AS AN ADDED BONUS I CAN USE MY TEMPORARY NUT ON THE BOTTOM AND MAKE A STOP
THAT WORKS GOING UP OR DOWN .

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darkzero

Global Moderator
Staff member
H-M Supporter-Premium
#4
Nice work. I made a quill stop on my PM45 using the same Morton BP quill stop. One of the best things I've added to my mill which didn't even have one at all.
 

lregister

Iron
Registered Member
#7
Beautiful design and execution!!!! I wonder if I could ask a favor? On the 833, what is the distance from the base of the knee (excluding the pan and base) to the table? Again, great job. Thanks!!!!
 

RIMSPOKE

Active Member
Active Member
#8
Beautiful design and execution!!!! I wonder if I could ask a favor? On the 833, what is the distance from the base of the knee
(excluding the pan and base) to the table? Again, great job. Thanks!!!!

THE TWO WAY QUILL STOP IS ONE OF THE BEST MODS I HAVE DONE TO THE MILL .
NOT SURE HOW I GOT ANYTHING DONE WITHOUT IT .

I DO HAVE A MITUTOYO DIGITAL QUILL KIT FOR IT BUT THE EDUCATED NUT ON THE STOP WORKS SO EFFECTIVELY
THAT I MAY END UP SELLING IT AND LEAVING THINGS THE WAY THEY ARE .

THE DISTANCE FROM THE BOTTOM OF THE BASE TO THE TABLE SURFACE ON THE PM-833T IS 10.125" .

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