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  #31  
Old 03-20-2024, 07:39 PM
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arizonian arizonian is offline
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Fifty-sixty years late but I think I improved on the dis-assembly and possibly the re-assembly of this old, obsolete mill.

Lower spindle to minimize spring OD.

A 2" chunk of 1-1/4" pipe, ID about 1-3/8", bored to 1.437" with a slot cut tangent to the ID to act as spring container.

Trial fit to spring OD.

Back to lathe, bore another .020", trial fit.

Rinse and repeat.

Ended up at 1.500" ID, still a bit snug

Cut slot wider for clearance of pin on tail of spring.

Spring container fits right over spring, wished I would have stopped at 1.480".

Raise spindle until spring fills container.

Rotate container counterclockwise with pliers while raising spindle until spring tail slips off of tail retaining pin. Retaining pin will fall out, so keep track of it.

If spindle handle is released, it WILL fall, so lock spindle height.

Rotate container CW until shaft pin is released from spring.

Remove spring container from mill with spring coiled up inside.

I'll drill a thru hole for a handle when I re-assemble.

Safety first, since we are now removing the head. Pull the fuses and hide them, then disconnect the wires from the motor switch.

Inverting the head with the worm gear provided. The ram had to be extended for clearance. The top of the spindle either doesn't have a seal or the seal is toast and spindle oil ran out the top. I put a bucket underneath until it quit dripping.

No need for an engine hoist, bring the table back up and let it support the inverted head.

Spun the head around on the table and came to a stop. I need a smaller pair of snap ring pliers.

More to come as this project unfolds.

On edit, photos got a bit out of sequence.
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Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

Weldor by choice, engineer by necessity.

Last edited by arizonian; 03-20-2024 at 07:49 PM.
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  #32  
Old 03-24-2024, 06:01 PM
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arizonian arizonian is offline
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Still working on the mill. I'm going to have to build a spring winder for the constant force spring to keep the spindle up. I won't say it come unwound, but the spring container I machined won't let me get the tail end of the spring anchored.

On another note, I ordered an ER32 NMTB30 collet holder and collet set along with a bunch of miscellaneous stuff from Shars. The shipping came to $169 for the complete order. I cancelled the collet set and the shipping dropped to ~$30, so I ordered the misc stuff and ordered the collet set separately, shipping on it came to about $34. Saved more than $100 by breaking up the order.
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Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

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  #33  
Old 03-28-2024, 12:01 AM
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Been a few days, got a chance to work on the mill today.

Built a spring winder to get the constant force spring back into the right position. Just like drum brakes, the spring won't move in the container until the spring is wound up a bit tighter to "release the brakes". The tail of the spring needed to have another 1/4" sticking out to engage the anchor.

The spring is in and engaged at both pins and the container removed. Had to install the spring twice, the first time the shaft anchor was 180° out and the spring would not come out of the container. Too low of tension will not provide enough force to counteract the quill/spindle weight.


Last photo: Got in a hurry, needed to move the tab for the spring winder bolt. Ground the tacks on the tab, grabbed a couple of magnets to hold the winder upright and never checked to see if where I was putting the tab was anywhere close to the correct position. As you can see, it's upside down and on the wrong face. I felt like an idiot, but still had the grinder handy, so removed it again and glued it in the right spot.

The head of the mill has been mated with the ram and turned right side up. Had enough time to tram the head in and suck everything up tight before dinner.

Tomorrow is another day.
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__________________
Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

Weldor by choice, engineer by necessity.

Last edited by arizonian; 03-28-2024 at 12:09 AM.
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  #34  
Old 04-06-2024, 10:09 AM
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arizonian arizonian is offline
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Quote:
Originally Posted by Shade Tree Welder View Post
You say quill I think you mean spindle. The quill is what moves the spindle up and down.

What is the tool holder, a 30 taper or is that custom too?

I would suggest getting a new tool holder that takes an ER series of collets.
There are different OD dimensions of ER collets, but that will get you into
a standard set of collets and some a proprietary nightmare.

Quote:
Originally Posted by arizonian View Post
Still working on the mill. ...

On another note, I ordered an ER32 NMTB30 collet holder and collet set along with a bunch of miscellaneous stuff from Shars. ...
Thanks, Shade. It only took a year for the advice to sink in.

So the new collet set has arrived and I have been working on a fixture for milling the pockets for the retaining screws.




Drawings, of course. Redrew the face view to make it more legible.

Squared off and flat. Not so easy with this vice but I made it work.

Chucked into the 4-jaw. I set the compound by indicating the taper on the new holder and then made adjustments on the fly.

Photo of my zeroes in case I got lost.

Checking the fit. Sharpie gets scrubbed off if the fit is tight.

Taper almost complete. I need to deepen it by 1/4" to allow for the indexing lugs.

Out of the lathe.



Next process is back into the mill, trim the bottom corners to 45° and cut a rabbet on either side for the indexing lugs, then cut the slots and pockets in the new holder.

More to come...
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Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

Weldor by choice, engineer by necessity.
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  #35  
Old 04-06-2024, 09:08 PM
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arizonian arizonian is offline
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Last piece of this puzzle.

Corners have been cut, rabbets cut, had to relieve the indexing lugs a bit to allow the holder to set down in the taper. The flats are just a bit wider than the taper.

Setting up

First slot cut. You can see the difference in color at the bottom.

Milling finished and deburred.

Cleaned up my mess and installed.
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__________________
Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

Weldor by choice, engineer by necessity.
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  #36  
Old 04-07-2024, 07:45 AM
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Mighty fine job!!!!!!!!!!!!! thanks for taking us along with your fix
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  #37  
Old 04-07-2024, 02:07 PM
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arizonian arizonian is offline
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Quote:
Originally Posted by digr View Post
Mighty fine job!!!!!!!!!!!!! thanks for taking us along with your fix
Thanks, it was a journey.

I didn't realize my last photo didn't include the holder.
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__________________
Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

Weldor by choice, engineer by necessity.
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