extractor slot
 

i

Rick,

I have just started the planning stage of a Luger custom barrel project and I was wondering if tooling exsisted to cut the extractor groove. I guess not. I was wondering who produces/produced the barrels for Gun Parts Corp. They must have sort of tooling to cut the extractor groove. And then there is Mauser and Waffenfrik Bern (sp?). What tooling did they use? Anyone have a contact at any of these places?

I do have the dimensions for the extractor groove both for the 1900 and 1906 style. But I am not very goog at grinding tools.

Gun Parts Corp (Numrich) made their own Luger barrels. The problem with them is/was varying degrees of quality control. I have heard many stories of improperly indexed front sight bases and extractor cuts...

Rick if you do not have my Blueprint CD it might be helpful...

Regarding the shape of the tooling, after studying the shape and angles involved, I think the extractor cut could be successfully accomplished by properly grinding the shape on an appropriately sized end mill. The cut could be made in any mill with the barrel (properly indexed) held at the correct angle in a milling vise.

Grinding the tool should not be that difficult because all we are doing is creating appropriate clearance for the extractor... resharpening the modified end mill to cut the groove is the most difficult part, but end mills this size are not that expensive to begin with, and you could probably find a couple of dull end mills the right size at a local machine shop for small change... then you can experiment to creat the right tool...

Once created, the right tool would last a very long time if used in small passes until you reach the appropriate depth.

Good Luck and let us know how you make out.

Rick,

after seeing the cutter photo above, I think you could easily make a similar cutter for the Luger extractor cut just by using a slot cutter tool that was chucked into your headstock (so you could make indexed movements to each tooth) and use a high speed grinding bit in a tool post grinder that was mounted to your crossfeed so you could take advantage of the crossfeed stop to make the teeth uniform. just take VERY small bites with the grinder till you get the contours that you want...

Good Luck and let us know how it works out... Try a used slot cutter as a guinea pig first of course....