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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

transvaal
.300 member

Reged: 19/01/13
Posts: 131
Loc: South Carolina

Re: Building, regulating & engraving a DR with shoe lump barrels
29/03/17 03:25 AM

You will notice that the diameter of the thru-hole for the extractors is small (7/32). It is small as I wanted reduce risk of removing too much metal. Therefore I chose a very strong hard steel alloy (O-1) to make the two extractors. Also as the extractor shaft diameters are small the construction of these needs to be of solid one piece material, to my mind. No welding.

The method I used to make these two extractors was to mill a round bar of O-1 and chuck the flattened bar in a four-jaw chuck in the lathe and cut away everything I did not want--this is the way of the past and the future way of constructing something like these extractors is additive machining not subtractive. A better way to have done this using the old method was to have forged a section of O-1 down to nearly the size I needed then turned it with the lathe. However, where in the past I would have done this, Arthritis in my hands makes it so painful to hold a hammer while forging on the anvil, that I can no longer do any forging of this type.

Of course the old method that I used is a long process and wastes a lot of expensive alloy steel, but here are some photos. I have included a photo of the fixture-jig I built to hold the extractors where they can be machined very accurately horizontally into two halves. The two extractor halves were heat treated. Fixtures can be made to hold extractor halves, but machining a bar of steel exactly square to all sides, then while the extractor fixture remains in the mill vise from the last machining (of the 4 mills cuts to make it square all around) mill a slot horizontally with a ball time milling cutter (in this case 7/32" milling cutter)to a depth a few thousands of an inch less than 50% of the diameter of the extractor shaft needed. Although I do not have a photo that illustrates the the cross pieces retainers that I made to hold the extractor firmly in place during milling, you can see the threaded holes in the top of the fixture and have a good idea of how they work. I made provisions for three cross piece retainers. I do not like this extractor fixture design I made and will make some other design in the future as needed.

Edited by CptCurl (06/05/17 09:48 PM)

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Subject	Posted by	Posted on
Building, regulating & engraving a DR with shoe lump barrels	transvaal	26/03/17 03:06 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	27/03/17 07:23 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	MMBA	27/03/17 12:56 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	27/03/17 01:55 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	27/03/17 02:22 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	27/03/17 03:07 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	buckbrush	27/03/17 04:08 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	Waidmannsheil	27/03/17 06:59 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	28/03/17 12:08 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	28/03/17 01:51 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	28/03/17 03:20 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	28/03/17 03:54 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	28/03/17 07:31 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	28/03/17 07:59 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Claydog	28/03/17 08:39 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	MMBA	28/03/17 12:59 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	gryphon	28/03/17 01:41 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	Waidmannsheil	28/03/17 08:07 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	29/03/17 03:25 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	29/03/17 04:11 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Matabele	29/03/17 06:48 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Chavez	07/01/20 04:09 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Rhodes	03/02/20 06:28 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	04/02/20 05:07 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Chavez	06/02/20 12:00 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	06/02/20 10:22 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Chavez	06/02/20 03:52 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	Waidmannsheil	04/02/20 06:57 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	04/02/20 11:22 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Rhodes	05/02/20 03:54 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	tinker	07/10/19 08:23 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	baileybradshaw	08/10/19 10:06 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	08/10/19 01:21 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	93x64mm	09/10/19 07:00 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	twobobbwana	09/10/19 12:08 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	09/10/19 01:01 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	DarylS	09/10/19 03:56 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	ruffcountry	04/01/20 12:34 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	Demonwolf444	13/04/17 02:30 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	29/03/17 01:25 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	30/03/17 02:05 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Matabele	30/03/17 07:58 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	30/03/17 09:40 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Matabele	01/04/17 07:08 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	01/04/17 11:03 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	04/04/17 12:24 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Waidmannsheil	04/04/17 06:28 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	04/04/17 12:21 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	Waidmannsheil	04/04/17 07:58 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	Matabele	07/04/17 07:11 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Waidmannsheil	07/04/17 07:42 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	07/04/17 08:18 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	twobobbwana	07/04/17 11:32 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	Matabele	08/04/17 09:26 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	08/04/17 11:15 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	twobobbwana	10/04/17 10:58 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	4al2	10/04/17 10:07 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	12/04/17 01:11 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	11/04/17 03:02 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	26/03/17 03:48 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	eagle27	26/03/17 07:33 PM
Re: Building, regulating & engraving a DR with shoe lump barrels	transvaal	27/03/17 12:12 AM
Re: Building, regulating & engraving a DR with shoe lump barrels	93x64mm	26/03/17 03:48 PM

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