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Head removal tool

emolson

Plastic
Joined
Dec 5, 2021
I've got a bridgeport-like mill with broken swivel, planning to remove the head to check the gear/worm.

Done that once before with engine hoist/muscle, but I've seen descriptions/videos of a tool made by welding a collet to a base that bolts to the table which seems like much easier way to go.

However, this machine doesn't use R8 but a fairly expensive quick change collet, and I also don't have a welder on hand so I'm considering something a bit different.

The outside of the spindle measures about 3 3/8", I'm thinking I can use a hole saw to drill a bunch of squares of plywood, then laminate them with glue/screws, with the bottom few layers a bit larger to bolt down to the table. Seems like it would be at least as stable since it's a larger diameter and will hold it over a length of 6" or so. Anything I'm missing or does this seem like a reasonable plan?
 

jccaclimber

Hot Rolled
Joined
Nov 22, 2015
Location
San Francisco
Plausible, maybe even reasonable, but definitely don’t try to retract the quill!
In the past I’ve seen it done with a large rod up the center as well, but I don’t know how that would do with your QC setup.
I’ve personally done it by securing a piece of 3/4” round stock in the vise and chucking to that. You do need that piece of stock to be *very* well secured, particularly in the sideways tilt direction. I had it passing through a piece of 1.5” x 6” long square stock and welded in, but a v-slot cut into a bar might do just as well.
 

emolson

Plastic
Joined
Dec 5, 2021
Does your collet have a 3/4" capacity? The one H&W makes is just a 3/4" rod, so as long as you can grab that with the collet it should work just as it does with an R8 spindle. It's pretty reasonable at $50: Mill Head Removal Post - H & W Machine Repair


Thanks, I ended up just pulling it with engine hoist again but I'll have to look into that for reassembly.

For anyone considering this in the future, I tried with a stack of 6x6" 3/4" plywood squares, but it was flexing a lot once the weight of the head started being on it, so I lost my nerve.
 








 
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