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

Waidmannsheil
.400 member

Reged: 19/04/13
Posts: 2377
Loc: Melbourne Australia

Re: Building, regulating & engraving a DR with shoe lump barrels
04/04/17 07:58 PM

There is another way of tapping a thread into through hardened material without having to anneal first and that is with EDM. An orbital head is required, which unfortunately are very expensive so not all engineering shops that have an EDM machine will have an orbital head. Here is how it works, first you have to either drill a hole in the job using a carbide drill or you can spark a hole in using the EDM machine with a truncated electrode. Then you machine an electrode a bit smaller than the hole that you have just drilled in to the work piece. You then have to thread cut the electrode with the same pitch and tread depth as you would for a normal external thread. The electrode is then placed in the orbital head which is centered over the hole and lowered down to the thread depth required. The head is connected to the current source and turned on. A separate motor drive orbitaly oscillates the electrode and using a hand-wheel and inbuilt dial indicator, the extremity of the orbit is increased until the required thread depth is achieved. Below is a link to a YouTube clip showing how it works. There are several companies who make the heads and they all vary a bit. I was very lucky to be able to pick up a complete AGIE EDM machine and Orbital head for almost nothing before Christmas, but I had to build anew mezzanine floor to be able to fit it underneath. I should have the machine up and running in the next few months. If you machine up the electrode yourself than getting the sparking done by someone with a machine won't cost too much. Hope this helps.

https://www.youtube.com/watch?v=2n2h49jAhLg

Waidmannsheil.

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There is nothing wrong with vegetarian food, so long as there is meat with it.

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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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