625 new cylinder fitting

[Robert Finegan]

I have a new cylinder that I will be fitting with new extractor. I do not have the cutter and tool for a N frame extractor. I do have an indexer and Bridgeport . Has anyone fitted an extractor on a mill ? Any advice on set up etc would be helpful .

Best

-Robert

 

[armorer951]

fitting extractor ratchets

Robert,

For me, cutting and fitting new extractor ratchets has always been a job completed using a 4" barrette file, by hand. That's what I was taught at the armorer's school.

In terms of using a milling machine......considering the close proximity of the other neighboring ratchets and the extractor boss, coupled with the necessity of repeated trials to confirm proper function and carry up, I can't imagine being able to perform or properly complete such a function on a machine.

While I'm only minimally familiar with basic operations on my milling machine, (I'm not a machinist) it would seem difficult to find an appropriate tool to do this. And, if you were able, there would still be the inevitable and repeated setup and removal, setup and removal from the fixture back to the gun for the ongoing function checks. Sounds like a nightmare.

Carter

 

[Protocall_Design]

Need more information. How new are we talking about? Is the extractor a blank, a finished one, one for a different caliber, etc?

If you have the newest kind with no alignment pins in the cylinder, and the matching extractor, there is no fitting of extractor to cylinder. There may be some fitting of hand to ratchets.

 

[Robert Finegan]

Yes, fitting the ratchet to hand is what is required. All are new/unfitted and need to be cut. Im thinking of the initial cuts on the mill to set the initial angle on the lugs/ratchets ( like the factory cutter) and finish with a file/stone for each for proper fit

Need more information. How new are we talking about? Is the extractor a blank, a finished one, one for a different caliber, etc?

If you have the newest kind with no alignment pins in the cylinder, and the matching extractor, there is no fitting of extractor to cylinder. There may be some fitting of hand to ratchets.

 

[colt_saa]

I can't help with a Bridgeport, I always hand fitted with a file and a stone.

But then I do not do these on a production basis.

 

[Robert Finegan]

Im pretty sure I can set up the indexer with 2 or 3 datum points for repeatable removal/installation of the extractor in a collet. Then set the DRO for X axis material removal. Ill post a few pics / videos once i get back into the shop. I may play it safe and just cut one at a time...

It may be after my bow hunting trip

 

[Protocall_Design]

A picture of what we're doing would be very helpful.

 

[Nightowl]

Once upon a time, well three or four years ago, I bought a new extractor for a 686. Rather than deal with the ratchets, I cut an already thin hand even further to fit the existing ratchets. The ratchets were consistent and I did not have to do anything to them. If I recall, the hand ended up being either .087 or .088. quite a bit under spec. Gun worked very well.

 

[Robert Finegan]

I did use a collet holder as a vise, and not the indexer but it worked out great. Factory hand passes by with just a little drag on each ratchet.


Dropbox - IMG_1134.MOV - 625 extractor

 

[Robert Finegan]

0.0020 of an inch each pass of the lug..and test fit